/* ==========================================
   1. CSS Variables
========================================== */
:root {
    /* Colors */
    --bg-black: #000000;
    --zinc-950: #09090b;
    --zinc-900: #18181b;
    --zinc-800: #27272a;
    --zinc-700: #3f3f46;
    --zinc-600: #52525b;
    --zinc-500: #71717a;
    --zinc-400: #a1a1aa;
    --zinc-300: #d4d4d8;
    --zinc-200: #e4e4e7;
    --emerald-500: #10b981;
    --emerald-400: #34d399;
    --emerald-600: #059669;
    --amber-500: #f59e0b;
    --blue-500: #3b82f6;
    
    /* Fonts */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Animation Speed */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s ease;
}

/* ==========================================
   2. Reset
========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

html {
    scroll-behavior: smooth;
    background-color: var(--bg-black);
}

body {
    background-color: var(--bg-black);
    color: #ffffff;
    font-family: var(--font-sans);
    overflow-x: hidden;
    line-height: 1.5;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    background: none;
    border: none;
    color: inherit;
    font: inherit;
    cursor: pointer;
    outline: none;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

/* ==========================================
   3. Scrollbar
========================================== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-black);
}

::-webkit-scrollbar-thumb {
    background: var(--zinc-800);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--zinc-700);
}

.custom-scrollbar {
    scrollbar-width: thin;
    scrollbar-color: var(--zinc-800) var(--bg-black);
}

/* ==========================================
   4. Typography
========================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 900;
    tracking-tight: -0.025em;
    color: #ffffff;
}

p {
    color: var(--zinc-400);
}

small {
    font-size: 0.75rem;
    color: var(--zinc-500);
}

.links {
    color: var(--emerald-400);
    font-weight: 700;
}

.links:hover {
    color: var(--emerald-500);
    text-decoration: underline;
}

/* ==========================================
   5. Header
========================================== */
header {
    background-color: rgba(9, 9, 11, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--zinc-900);
}

/* Logo Setup */
header img[alt="Studio Logo"] {
    width: 32px !important;
    height: 32px !important;
    min-width: 32px !important;
    min-height: 32px !important;
    max-width: 32px !important;
    max-height: 32px !important;
    object-fit: cover;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

/* Navigation layout links */
header nav a {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--zinc-400);
}

header nav a:hover {
    color: #ffffff;
}

/* Search input node overrides */
header #searchInput {
    background-color: var(--zinc-900);
    border: 1px solid var(--zinc-800);
    color: #ffffff;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

header #searchInput:focus {
    border-color: var(--emerald-500);
    box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
    outline: none;
}

/* Social icons layout sizing defaults */
.social-icons a {
    color: var(--zinc-500);
    font-size: 1rem;
}

.social-icons a:hover {
    color: #ffffff;
}

/* Account authentication hooks */
.login-btn {
    color: var(--zinc-400);
    font-weight: 700;
    font-size: 0.75rem;
}

.login-btn:hover {
    color: #ffffff;
}

.signup-btn {
    background-color: #ffffff;
    color: #000000;
    font-weight: 700;
    font-size: 0.75rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
}

.signup-btn:hover {
    transform: scale(1.04);
}

/* ==========================================
   6. Mobile Navigation
========================================= */
.hamburger {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 24px;
    cursor: pointer;
}

.hamburger span {
    background-color: #ffffff;
    height: 2px;
    width: 100%;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

/* Mobile fly-out mechanics rules */
.slide-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background-color: var(--zinc-950);
    border-left: 1px solid var(--zinc-900);
    z-index: 9999;
    transition: right var(--transition-normal);
}

.slide-menu.active {
    right: 0;
}

.menu-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 9998;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.menu-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

/* ==========================================
   7. Hero Section
========================================== */
#featured-hero {
    background-color: var(--zinc-950);
    border: 1px solid var(--zinc-900);
    position: relative;
    overflow: hidden;
}

#featured-hero img {
    transition: transform var(--transition-slow);
}

#featured-hero:hover img {
    transform: scale(1.03);
}

/* Hero Badge Tag Layout */
#hero-tag {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--emerald-400);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

/* ==========================================
   8. Section Titles
========================================== */
h2.text-base {
    color: var(--zinc-200);
    letter-spacing: 0.05em;
}

h2 span {
    display: inline-block;
    vertical-align: middle;
}

/* ==========================================
   9. Song Cards
========================================== */
.song-card {
    background-color: var(--zinc-950);
    border: 1px solid rgba(39, 39, 42, 0.4);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    transition: all var(--transition-normal);
    position: relative;
    cursor: pointer;
}

.song-card:hover {
    background-color: var(--zinc-900);
    border-color: var(--zinc-700);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px -10px rgba(0, 0, 0, 0.8);
}

/* Cover Image Layer Frame Wrapper */
.song-card-img-wrap {
    width: 100%;
    aspect-ratio: 1 / 1;
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-md);
    background-color: var(--zinc-900);
    margin-bottom: var(--space-sm);
}

.song-card-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.song-card:hover .song-card-img-wrap img {
    transform: scale(1.05);
}

/* Track Identification Data Text Labels */
.song-card h4 {
    font-size: 0.875rem;
    font-weight: 700;
    color: #ffffff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.song-card p {
    font-size: 0.75rem;
    color: var(--zinc-500);
}

/* ==========================================
   10. Buttons
========================================== */
/* Floating Instant Play Overlay Button Action Trigger */
.card-hover-play-trigger {
    position: absolute;
    bottom: 8px;
    right: 8px;
    width: 36px;
    height: 36px;
    background-color: #ffffff;
    color: #000000;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(4px);
    transition: all var(--transition-fast);
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
    z-index: 10;
}

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

.card-hover-play-trigger:hover {
    transform: scale(1.06) !important;
    background-color: var(--emerald-400);
}

/* General Layout Functional Action Controls Buttons */
.btn-lyrics {
    font-size: 11px;
    font-weight: 700;
    color: var(--zinc-400);
}

.btn-lyrics:hover {
    color: var(--emerald-400);
}

.btn-download {
    font-size: 11px;
    font-weight: 700;
    color: var(--zinc-400);
}

.btn-download:hover {
    color: #ffffff;
}

/* ==========================================
   11. Category Badges
========================================== */
.category-badge {
    font-size: 9px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    background-color: var(--zinc-900);
    color: var(--zinc-400);
    border: 1px solid var(--zinc-800);
    display: inline-block;
}

/* ==========================================
   12. Language Cards
========================================== */
.language-hub-item {
    padding: var(--space-sm) 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(39, 39, 42, 0.3);
}

.language-hub-item:last-child {
    border-bottom: none;
}

.language-hub-name {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--zinc-300);
}

.language-hub-item:hover .language-hub-name {
    color: var(--emerald-400);
}

/* ==========================================
   13. Playlist Cards
========================================== */
.playlist-card {
    background: linear-gradient(135deg, var(--zinc-950) 0%, var(--zinc-900) 100%);
    border: 1px solid var(--zinc-800);
    border-radius: var(--radius-md);
    padding: var(--space-md);
}

/* ==========================================
   14. News Cards
========================================== */
.news-card-item {
    padding: var(--space-sm);
    background-color: rgba(24, 24, 27, 0.2);
    border: 1px solid var(--zinc-900);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast);
}

.news-card-item:hover {
    border-color: var(--zinc-800);
}

/* ==========================================
   15. Footer
========================================== */
footer.site-footer {
    border-top: 1px solid var(--zinc-900);
    background-color: var(--bg-black);
    padding: var(--space-xl) 0;
}

/* ==========================================
   16. Utility Classes
========================================== */
.hidden { display: none !important; }
.text-emerald { color: var(--emerald-400) !important; }
.bg-zinc-dark { background-color: var(--zinc-950); }
.border-zinc-muted { border-color: rgba(39, 39, 42, 0.4); }

/* Overlays Layer Intercept Systems Panels */
#lyrics-panel, #auth-modal-container {
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: opacity var(--transition-normal);
}

/* ==========================================
   17. Animations
========================================== */
@keyframes fadeInCard {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeInCard var(--transition-normal) forwards;
}