/* ============================================
   MUSIC STREAMING APP - COMBINED STYLES
   All CSS merged into a single file
   Cross-browser compatible (Chrome, Firefox, Safari, Edge)
   ============================================ */

/* ============================================
   0. BROWSER COMPATIBILITY FIXES
   ============================================ */

/* Safari flexbox fixes */
@supports (-webkit-touch-callout: none) {
    body {
        min-height: -webkit-fill-available;
    }
}

/* Webkit prefixes for transforms */
@-webkit-keyframes preloader-spin {
    to { -webkit-transform: rotate(360deg); transform: rotate(360deg); }
}

@-webkit-keyframes pulse-glow {
    0%, 100% {
        -webkit-box-shadow: 0 0 0 0 rgba(132, 204, 22, 0.4);
        box-shadow: 0 0 0 0 rgba(132, 204, 22, 0.4);
    }
    50% {
        -webkit-box-shadow: 0 0 0 8px rgba(132, 204, 22, 0);
        box-shadow: 0 0 0 8px rgba(132, 204, 22, 0);
    }
}

@-webkit-keyframes subtle-bounce {
    0%, 100% {
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
    50% {
        -webkit-transform: translateY(-2px);
        transform: translateY(-2px);
    }
}

@-webkit-keyframes spin {
    from {
        -webkit-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    to {
        -webkit-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}

@-webkit-keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@-webkit-keyframes slide-up {
    from {
        opacity: 0;
        -webkit-transform: translateY(10px);
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
}

/* ============================================
   1. DESIGN TOKENS (Variables)
   ============================================ */

:root {
    /* ----------------------------------------
       COLOR PALETTE - Electric Lime Theme
       ---------------------------------------- */
    
    /* Background Colors (dark green-black) */
    --bg-base: #0a0f0a;
    --bg-elevated: #141f14;
    --bg-highlight: #1e2e1e;
    --bg-press: #283d28;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #a8c8a8;
    --text-muted: #688868;
    
    /* Accent Colors - Lime */
    --accent-primary: #84cc16;
    --accent-primary-hover: #a3e635;
    --accent-secondary: #22c55e;
    
    /* Semantic Colors */
    --color-error: #ef4444;
    --color-warning: #f59e0b;
    --color-success: #22c55e;
    
    /* Border Colors */
    --border-default: #1e2e1e;
    --border-subtle: #283d28;
    
    /* ----------------------------------------
       SPACING SCALE (4px base unit)
       ---------------------------------------- */
    --space-unit: 4px;
    --space-xs: calc(var(--space-unit) * 1);
    --space-sm: calc(var(--space-unit) * 2);
    --space-md: calc(var(--space-unit) * 3);
    --space-lg: calc(var(--space-unit) * 4);
    --space-xl: calc(var(--space-unit) * 6);
    --space-2xl: calc(var(--space-unit) * 8);
    --space-3xl: calc(var(--space-unit) * 12);
    
    /* ----------------------------------------
       TYPOGRAPHY
       ---------------------------------------- */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-xs: 0.6875rem;
    --font-sm: 0.75rem;
    --font-base: 0.875rem;
    --font-md: 1rem;
    --font-lg: 1.25rem;
    --font-xl: 1.5rem;
    --font-2xl: 2rem;
    --font-3xl: 3rem;
    
    --weight-normal: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;
    
    --leading-tight: 1.2;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;
    
    /* ----------------------------------------
       BORDER RADIUS
       ---------------------------------------- */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-full: 9999px;
    
    /* ----------------------------------------
       TRANSITIONS
       ---------------------------------------- */
    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --duration-slow: 400ms;
    --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* ----------------------------------------
       SHADOWS
       ---------------------------------------- */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
    
    /* ----------------------------------------
       Z-INDEX SCALE
       ---------------------------------------- */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-tooltip: 600;
    
    /* ----------------------------------------
       LAYOUT DIMENSIONS
       ---------------------------------------- */
    --header-height: 80px;
    --sidebar-width: 260px;
    --sidebar-collapsed: 60px;
    --player-height: 90px;
    
    /* ----------------------------------------
       COMPONENT SIZES
       ---------------------------------------- */
    --touch-target: 44px;
    --icon-sm: 16px;
    --icon-md: 20px;
    --icon-lg: 24px;
    --icon-xl: 32px;
    --card-min-width: 160px;
    --card-max-width: 220px;
}

/* ============================================
   2. CSS RESET
   ============================================ */

*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
}

html {
    -moz-text-size-adjust: none;
    -webkit-text-size-adjust: none;
    text-size-adjust: none;
}

html,
body {
    height: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-base);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background-color: var(--bg-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
}

input, button, textarea, select {
    font: inherit;
    color: inherit;
}

ul, ol {
    list-style: none;
}

button {
    background: none;
    border: none;
    cursor: pointer;
}

a {
    color: inherit;
    text-decoration: none;
}

p, h1, h2, h3, h4, h5, h6 {
    overflow-wrap: break-word;
}

fieldset {
    border: none;
}

@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* ============================================
   3. BASE STYLES
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--weight-bold);
    line-height: var(--leading-tight);
    color: var(--text-primary);
}

h1 { font-size: var(--font-3xl); }
h2 { font-size: var(--font-2xl); }
h3 { font-size: var(--font-xl); }
h4 { font-size: var(--font-lg); }
h5 { font-size: var(--font-md); }
h6 { font-size: var(--font-base); }

p {
    color: var(--text-secondary);
}

small {
    font-size: var(--font-sm);
    color: var(--text-muted);
}

a {
    color: var(--text-primary);
    -webkit-transition: color var(--duration-fast) var(--ease-default);
    transition: color var(--duration-fast) var(--ease-default);
}

a:hover {
    color: var(--accent-primary);
}

a:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

button {
    display: -webkit-inline-box;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    min-width: var(--touch-target);
    min-height: var(--touch-target);
    border-radius: var(--radius-full);
    -webkit-transition: all var(--duration-fast) var(--ease-default);
    transition: all var(--duration-fast) var(--ease-default);
}

button:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

input, textarea {
    background-color: var(--bg-highlight);
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    padding: var(--space-sm) var(--space-md);
    color: var(--text-primary);
    -webkit-transition: border-color var(--duration-fast) var(--ease-default);
    transition: border-color var(--duration-fast) var(--ease-default);
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
}

input::placeholder, textarea::placeholder {
    color: var(--text-muted);
}

input[type="search"] {
    -webkit-appearance: none;
    appearance: none;
}

input[type="search"]::-webkit-search-cancel-button {
    -webkit-appearance: none;
    appearance: none;
}

img {
    height: auto;
    object-fit: cover;
}

::selection {
    background-color: var(--accent-primary);
    color: var(--bg-base);
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--bg-highlight);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--bg-press);
}

* {
    scrollbar-width: thin;
    scrollbar-color: var(--bg-highlight) transparent;
}

:focus:not(:focus-visible) {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}


/* ============================================
   4. LAYOUT
   ============================================ */

body {
    display: -webkit-box;
    display: -ms-flexbox;
    display: -webkit-grid;
    display: grid;
    grid-template-areas:
        "header header"
        "sidebar main"
        "footer footer";
    -webkit-grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-columns: var(--sidebar-width) 1fr;
    -webkit-grid-template-rows: var(--header-height) 1fr var(--player-height);
    grid-template-rows: var(--header-height) 1fr var(--player-height);
    height: 100vh;
    height: -webkit-fill-available;
    max-height: 100vh;
    max-height: -webkit-fill-available;
    overflow: hidden;
}

header {
    -webkit-grid-area: header;
    grid-area: header;
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background-color: var(--bg-elevated);
    border-bottom: 1px solid var(--border-default);
}

aside {
    -webkit-grid-area: sidebar;
    grid-area: sidebar;
    background-color: var(--bg-base);
    border-right: 1px solid var(--border-default);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overflow-x: hidden;
}

main {
    -webkit-grid-area: main;
    grid-area: main;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overflow-x: hidden;
    padding: var(--space-xl);
    background-color: var(--bg-base);
}

footer {
    -webkit-grid-area: footer;
    grid-area: footer;
    position: -webkit-sticky;
    position: sticky;
    bottom: 0;
    z-index: var(--z-sticky);
    background-color: var(--bg-elevated);
    border-top: 1px solid var(--border-default);
}

@media (max-width: 1024px) {
    body {
        grid-template-columns: var(--sidebar-collapsed) 1fr;
    }
    
    aside {
        width: var(--sidebar-collapsed);
    }
}

@media (max-width: 768px) {
    body {
        grid-template-areas:
            "header"
            "main"
            "footer";
        grid-template-columns: 1fr;
        grid-template-rows: var(--header-height) 1fr var(--player-height);
    }
    
    aside {
        position: fixed;
        top: var(--header-height);
        left: 0;
        bottom: var(--player-height);
        width: 220px;
        max-width: 75vw;
        z-index: var(--z-modal);
        transform: translateX(-100%);
        transition: transform var(--duration-normal) var(--ease-default);
        padding: var(--space-md) !important;
        align-items: stretch !important;
    }
    
    aside .logo-text,
    aside .nav-link span,
    aside .nav-section-title,
    aside .library-header span {
        display: block !important;
    }
    
    aside .nav-link {
        justify-content: flex-start !important;
        gap: var(--space-md);
    }
    
    aside .library-header {
        justify-content: space-between !important;
    }
    
    body.sidebar-visible aside {
        transform: translateX(0);
    }
    
    body.sidebar-visible::before {
        content: '';
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: var(--player-height);
        background-color: rgba(0, 0, 0, 0.5);
        z-index: calc(var(--z-modal) - 1);
    }
    
    main {
        padding: var(--space-lg);
    }
}

@media (max-width: 480px) {
    main {
        padding: var(--space-md);
    }
}

/* ============================================
   5. PRELOADER
   ============================================ */

.preloader {
    position: fixed;
    inset: 0;
    background: var(--bg-base);
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    z-index: 9999;
    -webkit-transition: opacity 0.4s, visibility 0.4s;
    transition: opacity 0.4s, visibility 0.4s;
}

.preloader-logo {
    width: 60px;
    height: 60px;
    color: var(--accent-primary);
}

.preloader-spinner {
    width: 24px;
    height: 24px;
    margin-top: 20px;
    border: 3px solid var(--bg-highlight);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    -webkit-animation: preloader-spin 0.7s linear infinite;
    animation: preloader-spin 0.7s linear infinite;
}

@keyframes preloader-spin {
    to { transform: rotate(360deg); }
}

.preloader-progress {
    display: none;
}

.preloader-text {
    margin-top: 16px;
    color: var(--text-muted);
    font-size: 12px;
}

body.loading {
    overflow: hidden;
}

/* ============================================
   6. HEADER
   ============================================ */

header {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 2fr 1fr;
    grid-template-columns: 1fr 2fr 1fr;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    -ms-grid-row-align: center;
    align-items: center;
    padding: 0 var(--space-lg);
    gap: var(--space-lg);
}

.header-left {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-sm);
}

.nav-arrows {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    gap: var(--space-xs);
}

.nav-arrows button {
    width: 32px;
    height: 32px;
    background-color: rgba(0, 0, 0, 0.4);
    color: var(--text-primary);
    font-size: var(--font-sm);
    border-radius: var(--radius-full);
}

.nav-arrows button:hover:not(:disabled) {
    background-color: rgba(0, 0, 0, 0.6);
}

.nav-arrows button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.header-center {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
}

.search-bar {
    width: 100%;
    max-width: 400px;
    position: relative;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
}

.search-bar input {
    width: 100%;
    height: 40px;
    padding: 0 var(--space-lg) 0 var(--space-3xl);
    background-color: var(--bg-highlight);
    border: 2px solid transparent;
    border-radius: var(--radius-full);
    font-size: var(--font-sm);
    color: var(--text-primary);
    -webkit-transition: all var(--duration-fast) var(--ease-default);
    transition: all var(--duration-fast) var(--ease-default);
}

.search-bar input:hover {
    background-color: var(--bg-press);
    border-color: var(--border-subtle);
}

.search-bar input:focus {
    background-color: var(--bg-press);
    border-color: var(--text-primary);
    outline: none;
}

.search-bar .search-icon {
    position: absolute;
    left: var(--space-md);
    color: var(--text-muted);
    font-size: var(--font-md);
    pointer-events: none;
    -webkit-transition: color var(--duration-fast) var(--ease-default);
    transition: color var(--duration-fast) var(--ease-default);
}

.search-bar input:focus + .search-icon,
.search-bar:focus-within .search-icon {
    color: var(--text-primary);
}

.header-right {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: end;
    -webkit-justify-content: flex-end;
    -ms-flex-pack: end;
    justify-content: flex-end;
    gap: var(--space-sm);
}

.header-icon-btn {
    width: 32px;
    height: 32px;
    min-width: 32px;
    color: var(--text-secondary);
    font-size: var(--font-md);
    background-color: transparent;
    border-radius: var(--radius-full);
    -webkit-transition: all var(--duration-fast) var(--ease-default);
    transition: all var(--duration-fast) var(--ease-default);
}

.header-icon-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-highlight);
    -webkit-transform: scale(1.05);
    transform: scale(1.05);
}

.profile-dropdown {
    position: relative;
}

.profile-btn {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-sm);
    padding: 2px;
    padding-right: var(--space-sm);
    background-color: rgba(0, 0, 0, 0.4);
    border-radius: var(--radius-full);
    -webkit-transition: all var(--duration-fast) var(--ease-default);
    transition: all var(--duration-fast) var(--ease-default);
}

.profile-btn:hover {
    background-color: rgba(0, 0, 0, 0.6);
}

.profile-btn img {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.profile-btn .chevron {
    font-size: 10px;
    color: var(--text-primary);
    -webkit-transition: -webkit-transform var(--duration-fast) var(--ease-default);
    transition: -webkit-transform var(--duration-fast) var(--ease-default);
    transition: transform var(--duration-fast) var(--ease-default);
}

.profile-btn[aria-expanded="true"] .chevron {
    -webkit-transform: rotate(180deg);
    transform: rotate(180deg);
}

.profile-menu {
    position: absolute;
    top: calc(100% + var(--space-sm));
    right: 0;
    min-width: 200px;
    background-color: var(--bg-highlight);
    border-radius: var(--radius-md);
    -webkit-box-shadow: var(--shadow-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--space-xs);
    z-index: var(--z-dropdown);
    opacity: 0;
    -webkit-transform: translateY(-8px);
    transform: translateY(-8px);
    pointer-events: none;
    -webkit-transition: all var(--duration-fast) var(--ease-default);
    transition: all var(--duration-fast) var(--ease-default);
}

.profile-menu:not([hidden]) {
    opacity: 1;
    -webkit-transform: translateY(0);
    transform: translateY(0);
    pointer-events: auto;
}

.profile-menu-item {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: var(--font-sm);
    -webkit-transition: all var(--duration-fast) var(--ease-default);
    transition: all var(--duration-fast) var(--ease-default);
}

.profile-menu-item:hover {
    background-color: var(--bg-press);
    color: var(--text-primary);
}

.profile-menu-item i {
    width: 16px;
    text-align: center;
}

.profile-menu-divider {
    border: none;
    border-top: 1px solid var(--border-default);
    margin: var(--space-xs) 0;
}

.mobile-menu-btn {
    display: none;
    width: 40px;
    height: 40px;
    color: var(--text-primary);
    font-size: var(--font-lg);
}

@media (max-width: 1024px) {
    header {
        -ms-grid-columns: auto 1fr auto;
        grid-template-columns: auto 1fr auto;
    }
}

@media (max-width: 768px) {
    header {
        -ms-grid-columns: auto 1fr auto;
        grid-template-columns: auto 1fr auto;
        padding: 0 var(--space-md);
        gap: var(--space-md);
    }
    
    .mobile-menu-btn {
        display: -webkit-box;
        display: -webkit-flex;
        display: -ms-flexbox;
        display: flex;
    }
    
    .nav-arrows {
        display: none;
    }
    
    .search-bar {
        max-width: none;
    }
}

@media (max-width: 480px) {
    .header-icon-btn {
        display: none;
    }
    
    .profile-btn .chevron {
        display: none;
    }
}


/* ============================================
   7. SIDEBAR
   ============================================ */

aside {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-xl);
}

.logo {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) 0;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--accent-primary);
}

.logo-text {
    font-size: var(--font-lg);
    font-weight: var(--weight-bold);
    color: var(--text-primary);
}

.nav-section {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    gap: var(--space-xs);
}

.nav-section-title {
    font-size: var(--font-xs);
    font-weight: var(--weight-semibold);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: var(--space-sm) var(--space-md);
}

.nav-link {
    position: relative;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: var(--font-base);
    font-weight: var(--weight-medium);
    -webkit-transition: all var(--duration-fast) var(--ease-default);
    transition: all var(--duration-fast) var(--ease-default);
    overflow: hidden;
}

.nav-link::after {
    content: '';
    position: absolute;
    inset: 0;
    background-color: var(--bg-highlight);
    border-radius: var(--radius-md);
    -webkit-transform: scaleX(0);
    transform: scaleX(0);
    -webkit-transform-origin: left;
    transform-origin: left;
    -webkit-transition: -webkit-transform var(--duration-fast) var(--ease-default);
    transition: -webkit-transform var(--duration-fast) var(--ease-default);
    transition: transform var(--duration-fast) var(--ease-default);
    z-index: -1;
}

.nav-link:hover::after {
    -webkit-transform: scaleX(1);
    transform: scaleX(1);
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link.active {
    color: var(--text-primary);
}

.nav-link.active::after {
    -webkit-transform: scaleX(1);
    transform: scaleX(1);
}

.nav-link.active::before {
    content: '';
    position: absolute;
    left: 0;
    width: 3px;
    height: 24px;
    background-color: var(--accent-primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    -webkit-box-shadow: 0 0 12px var(--accent-primary);
    box-shadow: 0 0 12px var(--accent-primary);
}

.nav-link i {
    width: var(--icon-lg);
    font-size: var(--font-md);
    text-align: center;
    -webkit-transition: -webkit-transform var(--duration-fast) var(--ease-default);
    transition: -webkit-transform var(--duration-fast) var(--ease-default);
    transition: transform var(--duration-fast) var(--ease-default);
}

.nav-link:hover i {
    -webkit-transform: scale(1.1);
    transform: scale(1.1);
}

.nav-link span {
    flex: 1;
}

.library-section {
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    -ms-flex: 1;
    flex: 1;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    gap: var(--space-sm);
}

.library-header {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: justify;
    -webkit-justify-content: space-between;
    -ms-flex-pack: justify;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
}

.library-header span {
    font-size: var(--font-xs);
    font-weight: var(--weight-semibold);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.library-header button {
    width: 24px;
    height: 24px;
    min-width: 24px;
    min-height: 24px;
    color: var(--text-muted);
    font-size: var(--font-sm);
}

.library-header button:hover {
    color: var(--text-primary);
}

@media (max-width: 1024px) {
    aside {
        padding: var(--space-md);
        -webkit-box-align: center;
        -webkit-align-items: center;
        -ms-flex-align: center;
        align-items: center;
    }
    
    .logo-text,
    .nav-link span,
    .nav-section-title,
    .library-header span {
        display: none;
    }
    
    .nav-link {
        -webkit-box-pack: center;
        -webkit-justify-content: center;
        -ms-flex-pack: center;
        justify-content: center;
        padding: var(--space-md);
    }
    
    .nav-link i {
        margin: 0;
    }
    
    .library-header {
        -webkit-box-pack: center;
        -webkit-justify-content: center;
        -ms-flex-pack: center;
        justify-content: center;
    }
}

/* ============================================
   8. PLAYER (Footer)
   ============================================ */

footer {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 2fr 1fr;
    grid-template-columns: 1fr 2fr 1fr;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    -ms-grid-row-align: center;
    align-items: center;
    padding: 0 var(--space-lg);
    gap: var(--space-lg);
}

.player-left {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-md);
    min-width: 0;
}

.player-track-image {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    flex-shrink: 0;
}

.player-track-info {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.player-track-title {
    font-size: var(--font-sm);
    font-weight: var(--weight-medium);
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
}

.player-track-title:hover {
    text-decoration: underline;
}

.player-track-artist {
    font-size: var(--font-xs);
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
}

.player-track-artist:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

.player-like-btn {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    color: var(--text-secondary);
    font-size: var(--font-md);
    flex-shrink: 0;
}

.player-like-btn:hover {
    color: var(--text-primary);
}

.player-like-btn.liked {
    color: var(--accent-primary);
}

.player-like-btn.liked i {
    font-weight: 900;
}

.player-center {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-sm);
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}

.player-controls {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-lg);
}

.player-controls .control-btn {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    color: var(--text-secondary);
    font-size: var(--font-md);
    -webkit-transition: all var(--duration-fast) var(--ease-default);
    transition: all var(--duration-fast) var(--ease-default);
}

.player-controls .control-btn:hover {
    color: var(--text-primary);
    -webkit-transform: scale(1.15);
    transform: scale(1.15);
}

.player-controls .control-btn:active {
    -webkit-transform: scale(0.95);
    transform: scale(0.95);
}

.player-controls .control-btn.active {
    color: var(--accent-primary);
    text-shadow: 0 0 12px var(--accent-primary);
}

.player-controls .play-btn {
    width: 36px;
    height: 36px;
    min-width: 36px;
    min-height: 36px;
    background-color: var(--text-primary);
    color: var(--bg-base);
    font-size: var(--font-sm);
    -webkit-transition: all var(--duration-fast) var(--ease-bounce);
    transition: all var(--duration-fast) var(--ease-bounce);
    -webkit-box-shadow: 0 4px 16px rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 16px rgba(255, 255, 255, 0.2);
}

.player-controls .play-btn:hover {
    -webkit-transform: scale(1.1);
    transform: scale(1.1);
    -webkit-box-shadow: 0 6px 24px rgba(255, 255, 255, 0.3);
    box-shadow: 0 6px 24px rgba(255, 255, 255, 0.3);
}

.player-controls .play-btn:active {
    -webkit-transform: scale(0.95);
    transform: scale(0.95);
}

.player-controls .play-btn i {
    margin-left: 2px;
    -webkit-transition: -webkit-transform var(--duration-fast) var(--ease-default);
    transition: -webkit-transform var(--duration-fast) var(--ease-default);
    transition: transform var(--duration-fast) var(--ease-default);
}

.player-controls .play-btn:hover i {
    -webkit-transform: scale(1.1);
    transform: scale(1.1);
}

.player-progress {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
}

.player-time {
    font-size: var(--font-xs);
    color: var(--text-muted);
    min-width: 40px;
    font-variant-numeric: tabular-nums;
}

.player-time:first-child {
    text-align: right;
}

.player-time:last-child {
    text-align: left;
}

.player-right {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: end;
    -webkit-justify-content: flex-end;
    -ms-flex-pack: end;
    justify-content: flex-end;
    gap: var(--space-sm);
}

.player-right .control-btn {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    color: var(--text-secondary);
    font-size: var(--font-md);
    -webkit-transition: all var(--duration-fast) var(--ease-default);
    transition: all var(--duration-fast) var(--ease-default);
}

.player-right .control-btn:hover {
    color: var(--text-primary);
}

.volume-control {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-xs);
}

.volume-bar {
    width: 93px;
}

@media (max-width: 1024px) {
    footer {
        -ms-grid-columns: auto 1fr auto;
        grid-template-columns: auto 1fr auto;
    }
    
    .volume-bar {
        width: 80px;
    }
}

@media (max-width: 768px) {
    footer {
        -ms-grid-columns: auto 1fr auto;
        grid-template-columns: auto 1fr auto;
        padding: 0 var(--space-md);
        gap: var(--space-md);
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: var(--player-height);
        z-index: var(--z-sticky);
    }
    
    main {
        padding-bottom: calc(var(--player-height) + var(--space-md));
    }
    
    .player-left {
        -webkit-box-flex: 0;
        -webkit-flex: 0 0 auto;
        -ms-flex: 0 0 auto;
        flex: 0 0 auto;
    }
    
    .player-center {
        -webkit-box-flex: 1;
        -webkit-flex: 1;
        -ms-flex: 1;
        flex: 1;
        -webkit-box-pack: center;
        -webkit-justify-content: center;
        -ms-flex-pack: center;
        justify-content: center;
    }
    
    .player-track-image {
        width: 40px;
        height: 40px;
    }
    
    .player-track-info {
        display: none;
    }
    
    .player-like-btn {
        display: none;
    }
    
    .player-controls {
        gap: var(--space-md);
    }
    
    .player-controls .control-btn:first-child,
    .player-controls .control-btn:last-child {
        display: none;
    }
    
    .player-progress {
        display: none;
    }
    
    .volume-control {
        display: none;
    }
    
    .player-right .control-btn:first-child {
        display: none;
    }
}

@media (max-width: 480px) {
    .player-right {
        display: none;
    }
    
    .player-left {
        display: none;
    }
    
    footer {
        display: -webkit-box;
        display: -webkit-flex;
        display: -ms-flexbox;
        display: flex;
        -webkit-box-pack: center;
        -webkit-justify-content: center;
        -ms-flex-pack: center;
        justify-content: center;
        -webkit-box-align: center;
        -webkit-align-items: center;
        -ms-flex-align: center;
        align-items: center;
        padding: 0 var(--space-md);
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: var(--player-height);
        z-index: var(--z-sticky);
    }
    
    .player-center {
        max-width: none;
        margin: 0;
        -webkit-box-flex: 0;
        -webkit-flex: 0 0 auto;
        -ms-flex: 0 0 auto;
        flex: 0 0 auto;
    }
    
    main {
        padding-bottom: calc(var(--player-height) + var(--space-md));
    }
}


/* ============================================
   9. BUTTONS
   ============================================ */

.btn-primary {
    background-color: var(--accent-primary);
    color: var(--bg-base);
    padding: var(--space-md) var(--space-2xl);
    font-weight: var(--weight-semibold);
    font-size: var(--font-base);
}

.btn-primary:hover {
    background-color: var(--accent-primary-hover);
    transform: scale(1.02);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--text-secondary);
    padding: var(--space-md) var(--space-2xl);
    font-weight: var(--weight-semibold);
    font-size: var(--font-base);
}

.btn-secondary:hover {
    border-color: var(--text-primary);
    transform: scale(1.02);
}

.btn-icon {
    width: var(--touch-target);
    height: var(--touch-target);
    color: var(--text-secondary);
    font-size: var(--font-md);
}

.btn-icon:hover {
    color: var(--text-primary);
    background-color: var(--bg-highlight);
}

.btn-icon--sm {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    font-size: var(--font-sm);
}

.btn-active {
    color: var(--accent-primary);
}

.btn-disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* ============================================
   10. PROGRESS BAR
   ============================================ */

.progress-bar {
    position: relative;
    width: 100%;
    height: 4px;
    background-color: var(--bg-highlight);
    border-radius: var(--radius-full);
    cursor: pointer;
    overflow: visible;
    -webkit-transition: height var(--duration-fast) var(--ease-default);
    transition: height var(--duration-fast) var(--ease-default);
}

.progress-bar:hover {
    height: 6px;
}

.progress-bar-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background-color: var(--text-primary);
    border-radius: var(--radius-full);
    -webkit-transition: width var(--duration-fast) linear,
                background-color var(--duration-fast) var(--ease-default),
                -webkit-box-shadow var(--duration-fast) var(--ease-default);
    transition: width var(--duration-fast) linear,
                background-color var(--duration-fast) var(--ease-default),
                box-shadow var(--duration-fast) var(--ease-default);
}

.progress-bar:hover .progress-bar-fill {
    background-color: var(--accent-primary);
    -webkit-box-shadow: 0 0 12px var(--accent-primary);
    box-shadow: 0 0 12px var(--accent-primary);
}

.progress-bar-handle {
    position: absolute;
    top: 50%;
    width: 12px;
    height: 12px;
    background-color: var(--text-primary);
    border-radius: var(--radius-full);
    -webkit-transform: translate(-50%, -50%) scale(0);
    transform: translate(-50%, -50%) scale(0);
    -webkit-transition: -webkit-transform var(--duration-fast) var(--ease-bounce),
                -webkit-box-shadow var(--duration-fast) var(--ease-default);
    transition: transform var(--duration-fast) var(--ease-bounce),
                box-shadow var(--duration-fast) var(--ease-default);
    -webkit-box-shadow: var(--shadow-sm);
    box-shadow: var(--shadow-sm);
}

.progress-bar:hover .progress-bar-handle {
    -webkit-transform: translate(-50%, -50%) scale(1);
    transform: translate(-50%, -50%) scale(1);
    -webkit-box-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
}

.progress-bar.dragging .progress-bar-handle {
    -webkit-transform: translate(-50%, -50%) scale(1.2);
    transform: translate(-50%, -50%) scale(1.2);
    -webkit-box-shadow: 0 0 12px rgba(255, 255, 255, 0.5);
    box-shadow: 0 0 12px rgba(255, 255, 255, 0.5);
}

.progress-bar.dragging .progress-bar-fill {
    background-color: var(--accent-primary);
    -webkit-box-shadow: 0 0 12px var(--accent-primary);
    box-shadow: 0 0 12px var(--accent-primary);
}

.progress-bar-handle:active {
    -webkit-transform: translate(-50%, -50%) scale(1.2);
    transform: translate(-50%, -50%) scale(1.2);
}

.volume-bar {
    width: 100px;
    height: 4px;
}

.volume-bar .progress-bar-fill {
    background-color: var(--text-primary);
}

.volume-bar:hover .progress-bar-fill {
    background-color: var(--accent-primary);
    -webkit-box-shadow: 0 0 8px var(--accent-primary);
    box-shadow: 0 0 8px var(--accent-primary);
}

.progress-bar::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 0;
    right: 0;
    bottom: -8px;
}

/* ============================================
   11. ANIMATIONS
   ============================================ */

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(132, 204, 22, 0.4);
    }
    50% {
        box-shadow: 0 0 0 8px rgba(132, 204, 22, 0);
    }
}

@keyframes subtle-bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-2px);
    }
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slide-up {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.player-like-btn.liked i {
    -webkit-animation: subtle-bounce var(--duration-normal) var(--ease-bounce);
    animation: subtle-bounce var(--duration-normal) var(--ease-bounce);
}

.control-btn.active {
    -webkit-animation: pulse-glow 2s infinite;
    animation: pulse-glow 2s infinite;
}

.is-loading {
    -webkit-animation: spin 1s linear infinite;
    animation: spin 1s linear infinite;
}

@media (max-width: 768px) {
    .card .card-play-btn {
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
    
    .card:hover {
        -webkit-transform: none;
        transform: none;
        -webkit-box-shadow: none;
        box-shadow: none;
    }
    
    .card:active {
        -webkit-transform: scale(0.98);
        transform: scale(0.98);
        -webkit-transition: -webkit-transform 0.1s ease;
        transition: transform 0.1s ease;
    }
    
    .nav-link:active {
        background-color: var(--bg-highlight);
    }
    
    .control-btn:active,
    .play-btn:active,
    .card-play-btn:active {
        -webkit-transform: scale(0.9);
        transform: scale(0.9);
    }
    
    body.sidebar-visible::before {
        -webkit-animation: fade-in var(--duration-fast) ease-out;
        animation: fade-in var(--duration-fast) ease-out;
    }
}

@media (hover: hover) and (pointer: fine) {
    .card:hover {
        -webkit-transform: translateY(-4px);
        transform: translateY(-4px);
    }
    
    .card:hover .card-play-btn {
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
    
    .nav-link:hover::after {
        -webkit-transform: scaleX(1);
        transform: scaleX(1);
    }
    
    .control-btn:hover {
        -webkit-transform: scale(1.15);
        transform: scale(1.15);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}


/* ============================================
   12. MOBILE GESTURES
   ============================================ */

.pull-to-refresh {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    height: 50px;
    display: none;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    background-color: var(--bg-base);
    z-index: var(--z-fixed);
    pointer-events: none;
    opacity: 0;
    -webkit-transition: opacity var(--duration-fast) var(--ease-default);
    transition: opacity var(--duration-fast) var(--ease-default);
}

.pull-to-refresh.visible {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    opacity: 1;
}

.pull-to-refresh-icon {
    width: 24px;
    height: 24px;
    color: var(--accent-primary);
    -webkit-transition: -webkit-transform var(--duration-normal) var(--ease-default);
    transition: -webkit-transform var(--duration-normal) var(--ease-default);
    transition: transform var(--duration-normal) var(--ease-default);
}

.pull-to-refresh.pulling .pull-to-refresh-icon {
    -webkit-transform: rotate(180deg);
    transform: rotate(180deg);
}

.pull-to-refresh.refreshing .pull-to-refresh-icon {
    -webkit-animation: spin 1s linear infinite;
    animation: spin 1s linear infinite;
}

.bottom-sheet-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: var(--z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    -webkit-transition: opacity var(--duration-normal) var(--ease-default),
                visibility var(--duration-normal) var(--ease-default);
    transition: opacity var(--duration-normal) var(--ease-default),
                visibility var(--duration-normal) var(--ease-default);
}

.bottom-sheet-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.bottom-sheet {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--bg-elevated);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    z-index: var(--z-modal);
    -webkit-transform: translateY(100%);
    transform: translateY(100%);
    -webkit-transition: -webkit-transform var(--duration-normal) var(--ease-out);
    transition: -webkit-transform var(--duration-normal) var(--ease-out);
    transition: transform var(--duration-normal) var(--ease-out);
    max-height: 80vh;
    overflow: hidden;
}

.bottom-sheet.visible {
    -webkit-transform: translateY(0);
    transform: translateY(0);
}

.bottom-sheet-handle {
    width: 36px;
    height: 4px;
    background-color: var(--text-muted);
    border-radius: var(--radius-full);
    margin: var(--space-md) auto;
}

.bottom-sheet-header {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-default);
}

.bottom-sheet-image {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    object-fit: cover;
}

.bottom-sheet-info {
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    -ms-flex: 1;
    flex: 1;
    min-width: 0;
}

.bottom-sheet-title {
    font-size: var(--font-base);
    font-weight: var(--weight-semibold);
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.bottom-sheet-subtitle {
    font-size: var(--font-sm);
    color: var(--text-secondary);
}

.bottom-sheet-content {
    padding: var(--space-sm) 0;
    overflow-y: auto;
    max-height: calc(80vh - 100px);
}

.bottom-sheet-item {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-lg);
    color: var(--text-primary);
    font-size: var(--font-base);
    -webkit-transition: background-color var(--duration-fast) var(--ease-default);
    transition: background-color var(--duration-fast) var(--ease-default);
}

.bottom-sheet-item:active {
    background-color: var(--bg-highlight);
}

.bottom-sheet-item i {
    width: 24px;
    color: var(--text-secondary);
    text-align: center;
}

.expanded-player {
    position: fixed;
    inset: 0;
    background-color: var(--bg-base);
    z-index: var(--z-modal);
    -webkit-transform: translateY(100%);
    transform: translateY(100%);
    -webkit-transition: -webkit-transform var(--duration-slow) var(--ease-out);
    transition: -webkit-transform var(--duration-slow) var(--ease-out);
    transition: transform var(--duration-slow) var(--ease-out);
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    padding: var(--space-xl);
    padding-top: calc(var(--space-xl) + env(safe-area-inset-top));
    padding-bottom: calc(var(--space-xl) + env(safe-area-inset-bottom));
}

.expanded-player.visible {
    -webkit-transform: translateY(0);
    transform: translateY(0);
}

.expanded-player-header {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: justify;
    -webkit-justify-content: space-between;
    -ms-flex-pack: justify;
    justify-content: space-between;
    margin-bottom: var(--space-xl);
}

.expanded-player-close {
    width: 40px;
    height: 40px;
    color: var(--text-secondary);
    font-size: var(--font-lg);
}

.expanded-player-source {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    text-align: center;
}

.expanded-player-more {
    width: 40px;
    height: 40px;
    color: var(--text-secondary);
    font-size: var(--font-lg);
}

.expanded-player-cover {
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    -ms-flex: 1;
    flex: 1;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    padding: var(--space-xl) 0;
}

.expanded-player-cover img {
    width: 100%;
    max-width: 320px;
    aspect-ratio: 1;
    border-radius: var(--radius-lg);
    -webkit-box-shadow: var(--shadow-xl);
    box-shadow: var(--shadow-xl);
    -o-object-fit: cover;
    object-fit: cover;
}

.expanded-player-info {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.expanded-player-title {
    font-size: var(--font-xl);
    font-weight: var(--weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.expanded-player-artist {
    font-size: var(--font-base);
    color: var(--text-secondary);
}

.expanded-player-progress {
    margin-bottom: var(--space-lg);
}

.expanded-player-progress .progress-bar {
    height: 6px;
    margin-bottom: var(--space-sm);
}

.expanded-player-times {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: justify;
    -webkit-justify-content: space-between;
    -ms-flex-pack: justify;
    justify-content: space-between;
    font-size: var(--font-xs);
    color: var(--text-muted);
}

.expanded-player-controls {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    gap: var(--space-2xl);
    margin-bottom: var(--space-xl);
}

.expanded-player-controls .control-btn {
    width: 48px;
    height: 48px;
    color: var(--text-primary);
    font-size: var(--font-xl);
}

.expanded-player-controls .play-btn {
    width: 64px;
    height: 64px;
    background-color: var(--text-primary);
    color: var(--bg-base);
    border-radius: var(--radius-full);
    font-size: var(--font-xl);
}

.expanded-player-actions {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -ms-flex-pack: distribute;
    justify-content: space-around;
}

.expanded-player-actions .control-btn {
    width: 44px;
    height: 44px;
    color: var(--text-secondary);
    font-size: var(--font-md);
}

.card.swiping {
    transition: none !important;
}

.card-swipe-actions {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 80px;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    opacity: 0;
    -webkit-transition: opacity var(--duration-fast) var(--ease-default);
    transition: opacity var(--duration-fast) var(--ease-default);
}

.card-swipe-actions.left {
    left: -80px;
    background-color: var(--accent-primary);
}

.card-swipe-actions.right {
    right: -80px;
    background-color: var(--color-error);
}

.card.swiping .card-swipe-actions {
    opacity: 1;
}

.card-swipe-actions i {
    font-size: var(--font-xl);
    color: var(--text-primary);
}

@media (min-width: 769px) {
    .pull-to-refresh,
    .bottom-sheet,
    .bottom-sheet-overlay,
    .expanded-player {
        display: none !important;
    }
}

/* ============================================
   13. SECTION
   ============================================ */

.section {
    margin-bottom: var(--space-3xl);
    position: relative;
    isolation: isolate;
}

.section:last-child {
    margin-bottom: 0;
}

.section-header {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: justify;
    -webkit-justify-content: space-between;
    -ms-flex-pack: justify;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
    padding: var(--space-sm) 0;
    background-color: var(--bg-base);
    position: relative;
    z-index: 10;
}

.section-title {
    font-size: var(--font-xl);
    font-weight: var(--weight-bold);
    color: var(--text-primary);
    margin: 0;
    line-height: 1.2;
}

.section-link {
    font-size: var(--font-sm);
    font-weight: var(--weight-semibold);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    -webkit-transition: color var(--duration-fast) var(--ease-default);
    transition: color var(--duration-fast) var(--ease-default);
}

.section-link:hover {
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .section {
        margin-bottom: var(--space-2xl);
    }
    
    .section-title {
        font-size: var(--font-lg);
    }
    
    .section-link {
        font-size: var(--font-xs);
    }
}

/* ============================================
   14. CARDS GRID
   ============================================ */

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(var(--card-min-width), 1fr));
    gap: var(--space-xl);
    position: relative;
    z-index: 1;
}

@media (max-width: 1024px) {
    .cards-grid {
        gap: var(--space-lg);
    }
}

@media (max-width: 768px) {
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
    }
}

@media (max-width: 480px) {
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-sm);
    }
}

@media (max-width: 480px) {
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
    }
}


/* ============================================
   15. CARD
   ============================================ */

.card {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    padding: var(--space-md);
    background-color: var(--bg-elevated);
    border-radius: var(--radius-lg);
    cursor: pointer;
    -webkit-transition: all var(--duration-normal) var(--ease-default);
    transition: all var(--duration-normal) var(--ease-default);
    position: relative;
    z-index: 1;
}

.card:hover {
    background-color: var(--bg-highlight);
    -webkit-transform: translateY(-4px);
    transform: translateY(-4px);
    -webkit-box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
    z-index: 2;
}

.card-image {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    margin-bottom: var(--space-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.card-image img {
    width: 100%;
    height: 100%;
    -o-object-fit: cover;
    object-fit: cover;
    border-radius: var(--radius-md);
    -webkit-transition: -webkit-filter var(--duration-normal) var(--ease-default);
    transition: -webkit-filter var(--duration-normal) var(--ease-default);
    transition: filter var(--duration-normal) var(--ease-default);
}

.card:hover .card-image img {
    filter: brightness(0.85);
}

.card-play-btn {
    position: absolute;
    bottom: var(--space-sm);
    right: var(--space-sm);
    width: 48px;
    height: 48px;
    min-width: 48px;
    min-height: 48px;
    background-color: var(--accent-primary);
    color: var(--bg-base);
    font-size: var(--font-md);
    border-radius: var(--radius-full);
    -webkit-box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    opacity: 0;
    -webkit-transform: translateY(8px);
    transform: translateY(8px);
    -webkit-transition: all var(--duration-fast) var(--ease-default);
    transition: all var(--duration-fast) var(--ease-default);
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
}

.card:hover .card-play-btn {
    opacity: 1;
    -webkit-transform: translateY(0);
    transform: translateY(0);
}

.card-play-btn:hover {
    -webkit-transform: scale(1.05);
    transform: scale(1.05);
    background-color: var(--accent-primary-hover);
}

.card-play-btn:active {
    -webkit-transform: scale(0.95);
    transform: scale(0.95);
}

.card-play-btn i {
    margin-left: 2px;
}

.card-info {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    gap: var(--space-xs);
    min-width: 0;
}

.card-title {
    font-size: var(--font-base);
    font-weight: var(--weight-semibold);
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-subtitle {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: var(--leading-relaxed);
}

.card-subtitle--multiline {
    white-space: normal;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.card--artist .card-image {
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    overflow: visible;
}

.card--artist .card-image img {
    border-radius: var(--radius-full);
}

.card--artist .card-info {
    text-align: center;
}

.card--artist .card-subtitle {
    font-size: var(--font-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card--artist .card-play-btn {
    bottom: -8px;
    right: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.card--playlist .card-subtitle {
    color: var(--text-muted);
}

.card--album .card-image {
    box-shadow: var(--shadow-lg);
}

@media (max-width: 768px) {
    .card {
        padding: var(--space-sm);
    }
    
    .card-image {
        margin-bottom: var(--space-sm);
    }
    
    .card-title {
        font-size: var(--font-sm);
    }
    
    .card-subtitle {
        font-size: var(--font-xs);
    }
    
    .card-play-btn {
        width: 36px;
        height: 36px;
        min-width: 36px;
        min-height: 36px;
        font-size: var(--font-xs);
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
}

@media (max-width: 480px) {
    .card {
        padding: 6px;
    }
    
    .card-image {
        margin-bottom: 6px;
    }
    
    .card-title {
        font-size: var(--font-xs);
    }
    
    .card-subtitle {
        font-size: 10px;
        display: -webkit-box;
        -webkit-line-clamp: 1;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    
    .card-play-btn {
        width: 32px;
        height: 32px;
        min-width: 32px;
        min-height: 32px;
        font-size: 10px;
        bottom: 4px;
        right: 4px;
    }
}

/* ============================================
   16. TRACK LIST
   ============================================ */

.track-list {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
}

.track-list-header {
    display: grid;
    grid-template-columns: 40px 1fr 1fr 100px;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--border-default);
    color: var(--text-muted);
    font-size: var(--font-xs);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.track-list-header span:last-child {
    text-align: right;
}

@media (max-width: 768px) {
    .track-list-header {
        grid-template-columns: 32px 1fr 60px;
    }
    
    .track-list-header span:nth-child(3) {
        display: none;
    }
}

/* ============================================
   17. TRACK ROW
   ============================================ */

.track-row {
    display: grid;
    grid-template-columns: 40px 1fr 1fr 100px;
    gap: var(--space-md);
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    transition: background-color var(--duration-fast) var(--ease-default);
}

.track-row:hover {
    background-color: var(--bg-highlight);
}

.track-number {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    width: 40px;
    color: var(--text-muted);
    font-size: var(--font-base);
}

.track-row:hover .track-number span {
    display: none;
}

.track-row .track-play {
    display: none;
    width: 24px;
    height: 24px;
    min-width: 24px;
    min-height: 24px;
    color: var(--text-primary);
    font-size: var(--font-sm);
}

.track-row:hover .track-play {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
}

.track-info {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-md);
    min-width: 0;
}

.track-image {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    flex-shrink: 0;
}

.track-details {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.track-title {
    font-size: var(--font-base);
    font-weight: var(--weight-medium);
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.track-artist {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.track-artist:hover {
    color: var(--text-primary);
    text-decoration: underline;
    cursor: pointer;
}

.track-album {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.track-album:hover {
    color: var(--text-primary);
    text-decoration: underline;
    cursor: pointer;
}

.track-actions {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: end;
    -webkit-justify-content: flex-end;
    -ms-flex-pack: end;
    justify-content: flex-end;
    gap: var(--space-md);
}

.track-like-btn {
    width: 24px;
    height: 24px;
    min-width: 24px;
    min-height: 24px;
    color: transparent;
    font-size: var(--font-sm);
    opacity: 0;
    -webkit-transition: opacity var(--duration-fast) var(--ease-default);
    transition: opacity var(--duration-fast) var(--ease-default);
}

.track-row:hover .track-like-btn {
    opacity: 1;
    color: var(--text-secondary);
}

.track-like-btn:hover {
    color: var(--text-primary);
}

.track-like-btn.liked {
    opacity: 1;
    color: var(--accent-primary);
}

.track-duration {
    font-size: var(--font-sm);
    color: var(--text-muted);
    min-width: 40px;
    text-align: right;
}

@media (max-width: 768px) {
    .track-row {
        grid-template-columns: 32px 1fr 60px;
        padding: var(--space-sm);
    }
    
    .track-album {
        display: none;
    }
    
    .track-image {
        width: 36px;
        height: 36px;
    }
    
    .track-title {
        font-size: var(--font-sm);
    }
    
    .track-artist {
        font-size: var(--font-xs);
    }
    
    .track-like-btn {
        display: none;
    }
}


/* ============================================
   18. PAGE: COLLECTION
   ============================================ */

.page-header {
    margin-bottom: var(--space-2xl);
}

.page-title {
    font-size: var(--font-2xl);
    font-weight: var(--weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.page-subtitle {
    font-size: var(--font-base);
    color: var(--text-secondary);
}

.collection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(var(--card-min-width), 1fr));
    gap: var(--space-xl);
}

.filter-bar {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--space-sm) var(--space-lg);
    background-color: var(--bg-elevated);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    font-size: var(--font-sm);
    font-weight: var(--weight-medium);
    -webkit-transition: all var(--duration-fast) var(--ease-default);
    transition: all var(--duration-fast) var(--ease-default);
}

.filter-btn:hover {
    background-color: var(--bg-highlight);
    color: var(--text-primary);
}

.filter-btn.active {
    background-color: var(--text-primary);
    color: var(--bg-base);
}

.empty-state {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    padding: var(--space-3xl);
    text-align: center;
}

.empty-state-icon {
    font-size: 4rem;
    color: var(--text-muted);
    margin-bottom: var(--space-xl);
}

.empty-state-title {
    font-size: var(--font-xl);
    font-weight: var(--weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.empty-state-text {
    font-size: var(--font-base);
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    max-width: 400px;
}

.empty-state-btn {
    padding: var(--space-md) var(--space-2xl);
    background-color: var(--accent-primary);
    color: var(--bg-base);
    border-radius: var(--radius-full);
    font-size: var(--font-base);
    font-weight: var(--weight-semibold);
    -webkit-transition: all var(--duration-fast) var(--ease-default);
    transition: all var(--duration-fast) var(--ease-default);
}

.empty-state-btn:hover {
    background-color: var(--accent-primary-hover);
    -webkit-transform: scale(1.02);
    transform: scale(1.02);
}

@media (max-width: 768px) {
    .page-title {
        font-size: var(--font-xl);
    }
    
    .collection-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: var(--space-md);
    }
}

@media (max-width: 480px) {
    .collection-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================
   19. PAGE: DETAIL
   ============================================ */

.detail-hero {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: end;
    -webkit-align-items: flex-end;
    -ms-flex-align: end;
    align-items: flex-end;
    gap: var(--space-xl);
    padding: var(--space-3xl) 0 var(--space-xl);
    background: -webkit-gradient(linear, left top, left bottom, from(var(--bg-highlight)), to(var(--bg-base)));
    background: linear-gradient(180deg, var(--bg-highlight) 0%, var(--bg-base) 100%);
    margin: calc(-1 * var(--space-xl));
    margin-bottom: var(--space-xl);
    padding-left: var(--space-xl);
    padding-right: var(--space-xl);
}

.detail-cover {
    width: 232px;
    height: 232px;
    border-radius: var(--radius-lg);
    -webkit-box-shadow: var(--shadow-xl);
    box-shadow: var(--shadow-xl);
    -webkit-flex-shrink: 0;
    -ms-flex-negative: 0;
    flex-shrink: 0;
    -o-object-fit: cover;
    object-fit: cover;
}

.detail-hero--artist .detail-cover {
    border-radius: var(--radius-full);
}

.detail-info {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    gap: var(--space-sm);
    min-width: 0;
}

.detail-type {
    font-size: var(--font-sm);
    font-weight: var(--weight-semibold);
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.detail-title {
    font-size: var(--font-3xl);
    font-weight: var(--weight-bold);
    color: var(--text-primary);
    margin: 0;
    line-height: var(--leading-tight);
}

.detail-subtitle {
    font-size: var(--font-base);
    color: var(--text-secondary);
}

.detail-meta {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-sm);
    color: var(--text-secondary);
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
}

.detail-meta-item {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-xs);
}

.detail-meta-dot {
    width: 4px;
    height: 4px;
    background-color: var(--text-muted);
    border-radius: var(--radius-full);
}

.detail-actions {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-lg) 0;
    margin-bottom: var(--space-lg);
}

.play-btn-large {
    width: 56px;
    height: 56px;
    background-color: var(--accent-primary);
    color: var(--bg-base);
    border-radius: var(--radius-full);
    font-size: var(--font-lg);
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-transition: all var(--duration-fast) var(--ease-default);
    transition: all var(--duration-fast) var(--ease-default);
    -webkit-box-shadow: 0 8px 24px rgba(132, 204, 22, 0.3);
    box-shadow: 0 8px 24px rgba(132, 204, 22, 0.3);
}

.play-btn-large:hover {
    -webkit-transform: scale(1.05);
    transform: scale(1.05);
    background-color: var(--accent-primary-hover);
}

.play-btn-large i {
    margin-left: 2px;
}

.action-btn {
    width: 32px;
    height: 32px;
    color: var(--text-secondary);
    font-size: var(--font-lg);
    -webkit-transition: color var(--duration-fast) var(--ease-default);
    transition: color var(--duration-fast) var(--ease-default);
}

.action-btn:hover {
    color: var(--text-primary);
}

.action-btn.active {
    color: var(--accent-primary);
}

.detail-track-list {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
}

.detail-track-header {
    display: grid;
    grid-template-columns: 40px 1fr 1fr 100px;
    gap: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-default);
    color: var(--text-muted);
    font-size: var(--font-xs);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.detail-track-row {
    display: grid;
    grid-template-columns: 40px 1fr 1fr 100px;
    gap: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    align-items: center;
    transition: background-color var(--duration-fast) var(--ease-default);
}

.detail-track-row:hover {
    background-color: var(--bg-highlight);
}

.detail-section {
    margin-bottom: var(--space-2xl);
}

.detail-section-title {
    font-size: var(--font-xl);
    font-weight: var(--weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
}

.artist-stats {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    gap: var(--space-xl);
    margin-top: var(--space-md);
}

.stat-item {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
}

.stat-value {
    font-size: var(--font-lg);
    font-weight: var(--weight-bold);
    color: var(--text-primary);
}

.stat-label {
    font-size: var(--font-xs);
    color: var(--text-muted);
    text-transform: uppercase;
}

@media (max-width: 768px) {
    .detail-hero {
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
        -webkit-flex-direction: column;
        -ms-flex-direction: column;
        flex-direction: column;
        -webkit-box-align: center;
        -webkit-align-items: center;
        -ms-flex-align: center;
        align-items: center;
        text-align: center;
        padding: var(--space-xl);
    }
    
    .detail-cover {
        width: 180px;
        height: 180px;
    }
    
    .detail-title {
        font-size: var(--font-2xl);
    }
    
    .detail-meta {
        -webkit-box-pack: center;
        -webkit-justify-content: center;
        -ms-flex-pack: center;
        justify-content: center;
    }
    
    .detail-actions {
        -webkit-box-pack: center;
        -webkit-justify-content: center;
        -ms-flex-pack: center;
        justify-content: center;
    }
    
    .detail-track-header {
        display: none;
    }
    
    .detail-track-row {
        -ms-grid-columns: 1fr auto;
        grid-template-columns: 1fr auto;
    }
    
    .detail-track-row .track-number,
    .detail-track-row .track-album {
        display: none;
    }
    
    .artist-stats {
        -webkit-box-pack: center;
        -webkit-justify-content: center;
        -ms-flex-pack: center;
        justify-content: center;
    }
}

/* ============================================
   20. PAGE: DISCOVER
   ============================================ */

.genre-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--space-lg);
}

.genre-card {
    position: relative;
    aspect-ratio: 1.5;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    -webkit-transition: -webkit-transform var(--duration-fast) var(--ease-default);
    transition: -webkit-transform var(--duration-fast) var(--ease-default);
    transition: transform var(--duration-fast) var(--ease-default);
}

.genre-card:hover {
    -webkit-transform: scale(1.02);
    transform: scale(1.02);
}

.genre-card-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    -webkit-transition: -webkit-transform var(--duration-normal) var(--ease-default);
    transition: -webkit-transform var(--duration-normal) var(--ease-default);
    transition: transform var(--duration-normal) var(--ease-default);
}

.genre-card:hover .genre-card-bg {
    -webkit-transform: scale(1.1);
    transform: scale(1.1);
}

.genre-card-overlay {
    position: absolute;
    inset: 0;
    background: -webkit-gradient(linear, left top, right bottom, from(rgba(0,0,0,0.3)), to(rgba(0,0,0,0.6)));
    background: linear-gradient(135deg, rgba(0,0,0,0.3) 0%, rgba(0,0,0,0.6) 100%);
}

.genre-card-title {
    position: absolute;
    bottom: var(--space-lg);
    left: var(--space-lg);
    font-size: var(--font-lg);
    font-weight: var(--weight-bold);
    color: var(--text-primary);
}

/* Genre Colors */
.genre-card--pop { background: linear-gradient(135deg, #8b5cf6 0%, #d946ef 100%); }
.genre-card--hiphop { background: linear-gradient(135deg, #f97316 0%, #ef4444 100%); }
.genre-card--rock { background: linear-gradient(135deg, #dc2626 0%, #991b1b 100%); }
.genre-card--electronic { background: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%); }
.genre-card--rnb { background: linear-gradient(135deg, #ec4899 0%, #8b5cf6 100%); }
.genre-card--jazz { background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%); }
.genre-card--classical { background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%); }
.genre-card--country { background: linear-gradient(135deg, #84cc16 0%, #22c55e 100%); }

@media (max-width: 768px) {
    .genre-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
    }
    
    .genre-card-title {
        font-size: var(--font-base);
    }
}

.search-empty-state {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    min-height: 50vh;
    text-align: center;
    padding: var(--space-2xl);
}

.search-empty-icon {
    font-size: 4rem;
    color: var(--text-muted);
    margin-bottom: var(--space-xl);
}

.search-empty-title {
    font-size: var(--font-2xl);
    font-weight: var(--weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.search-empty-text {
    font-size: var(--font-base);
    color: var(--text-secondary);
    max-width: 300px;
}

/* ============================================
   21. PAGE: LIKED
   ============================================ */

.liked-header {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: end;
    -webkit-align-items: flex-end;
    -ms-flex-align: end;
    align-items: flex-end;
    gap: var(--space-xl);
    padding: var(--space-2xl) 0;
    margin-bottom: var(--space-xl);
}

.liked-cover {
    width: 232px;
    height: 232px;
    background: -webkit-gradient(linear, left top, right bottom, from(var(--accent-primary)), to(var(--accent-secondary)));
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    border-radius: var(--radius-lg);
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-shadow: var(--shadow-xl);
    box-shadow: var(--shadow-xl);
    -webkit-flex-shrink: 0;
    -ms-flex-negative: 0;
    flex-shrink: 0;
}

.liked-cover i {
    font-size: 80px;
    color: var(--text-primary);
}

.liked-info {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    gap: var(--space-sm);
}

.liked-type {
    font-size: var(--font-sm);
    font-weight: var(--weight-semibold);
    color: var(--text-primary);
    text-transform: uppercase;
}

.liked-title {
    font-size: var(--font-3xl);
    font-weight: var(--weight-bold);
    color: var(--text-primary);
    margin: 0;
}

.liked-meta {
    font-size: var(--font-sm);
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .liked-header {
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
        -webkit-flex-direction: column;
        -ms-flex-direction: column;
        flex-direction: column;
        -webkit-box-align: center;
        -webkit-align-items: center;
        -ms-flex-align: center;
        align-items: center;
        text-align: center;
    }
    
    .liked-cover {
        width: 180px;
        height: 180px;
    }
    
    .liked-cover i {
        font-size: 60px;
    }
    
    .liked-title {
        font-size: var(--font-2xl);
    }
}

/* ============================================
   22. PAGE: TRENDING
   ============================================ */

.chart-list {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    gap: var(--space-xs);
}

.chart-row {
    display: grid;
    grid-template-columns: 50px 1fr auto;
    gap: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    align-items: center;
    transition: background-color var(--duration-fast) var(--ease-default);
}

.chart-row:hover {
    background-color: var(--bg-highlight);
}

.chart-rank {
    font-size: var(--font-xl);
    font-weight: var(--weight-bold);
    color: var(--text-muted);
    text-align: center;
}

.chart-rank--top3 {
    color: var(--accent-primary);
}

.chart-info {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-md);
    min-width: 0;
}

.chart-image {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    flex-shrink: 0;
}

.chart-details {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    min-width: 0;
}

.chart-title {
    font-size: var(--font-base);
    font-weight: var(--weight-medium);
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chart-artist {
    font-size: var(--font-sm);
    color: var(--text-secondary);
}

.chart-stats {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    gap: var(--space-xl);
    color: var(--text-muted);
    font-size: var(--font-sm);
}

.chart-plays {
    min-width: 100px;
    text-align: right;
}

.chart-duration {
    min-width: 50px;
    text-align: right;
}

@media (max-width: 768px) {
    .chart-row {
        grid-template-columns: 40px 1fr;
    }
    
    .chart-rank {
        font-size: var(--font-lg);
    }
    
    .chart-image {
        width: 48px;
        height: 48px;
    }
    
    .chart-stats {
        display: none;
    }
}