/* SEED13 FIELD GUIDE TO HUMAN MUSIC - Styles */
/* Design: Retro-Futurist Editorial with Dark Cosmic Aesthetic */

/* ============================================
   ROOT VARIABLES & RESET
   ============================================ */

:root {
    /* Color System */
    --color-cosmic-orange: #D97706;
    --color-cosmic-orange-hover: #F59E0B;
    --color-cosmic-orange-light: #FEF3C7;
    
    /* Neutrals */
    --color-bg-page: #0A0A0A;
    --color-bg-surface: #1C1917;
    --color-text-primary: #F3EFE9;
    --color-text-secondary: #A8A29E;
    --color-text-tertiary: #57534E;
    
    /* Semantic */
    --color-vote-up: #22C55E;
    --color-vote-down: #EF4444;
    --color-link: #3B82F6;
    
    /* Spacing (8px base grid) */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 48px;
    --space-xl: 64px;
    --space-xxl: 96px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    
    /* Typography */
    --font-heading: 'Roboto Slab', serif;
    --font-body: 'JetBrains Mono', monospace;
    
    /* Transitions */
    --transition-fast: 200ms ease-out;
    --transition-medium: 250ms ease-in-out;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg-page);
    color: var(--color-text-primary);
    line-height: 1.7;
    font-size: 16px;
    overflow-x: hidden;
}

/* ============================================
   STARFIELD BACKGROUND
   ============================================ */

.stars-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(2px 2px at 20% 30%, white, transparent),
        radial-gradient(2px 2px at 60% 70%, white, transparent),
        radial-gradient(1px 1px at 50% 50%, white, transparent),
        radial-gradient(1px 1px at 80% 10%, white, transparent),
        radial-gradient(2px 2px at 90% 60%, white, transparent),
        radial-gradient(1px 1px at 33% 80%, white, transparent),
        radial-gradient(1px 1px at 15% 95%, white, transparent);
    background-size: 200% 200%;
    background-position: 0% 0%;
    opacity: 0.5;
    z-index: -1;
    animation: twinkle 180s infinite alternate;
}

@keyframes twinkle {
    0% { opacity: 0.3; }
    50% { opacity: 0.6; }
    100% { opacity: 0.3; }
}

/* ============================================
   LAYOUT CONTAINER
   ============================================ */

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ============================================
   HERO HEADER
   ============================================ */

.hero {
    padding: var(--space-xxl) 0;
    text-align: center;
    background: linear-gradient(180deg, rgba(217, 119, 6, 0.1) 0%, transparent 100%);
    border-bottom: 2px solid var(--color-text-tertiary);
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-sm);
    color: var(--color-cosmic-orange);
    text-shadow: 0 0 20px rgba(217, 119, 6, 0.5);
}

.hero-subtitle {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.hero-description {
    font-size: 14px;
    color: var(--color-text-tertiary);
    max-width: 700px;
    margin: 0 auto;
}

/* ============================================
   MAIN CONTENT
   ============================================ */

.main-content {
    padding: var(--space-xl) 0;
}

.intro-card {
    background: var(--color-bg-surface);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-xl);
    border-left: 4px solid var(--color-cosmic-orange);
}

.intro-card h2 {
    font-family: var(--font-heading);
    font-size: 30px;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--color-cosmic-orange);
}

.intro-card p {
    margin-bottom: var(--space-sm);
    color: var(--color-text-primary);
}

.vote-instruction {
    font-size: 14px;
    color: var(--color-text-secondary);
    font-style: italic;
}

/* ============================================
   GENRE SECTIONS
   ============================================ */

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

.genre-layout {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: var(--space-lg);
    align-items: start;
}

/* Genre Card */
.genre-card {
    background: var(--color-bg-surface);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    position: sticky;
    top: var(--space-md);
}

.genre-title {
    font-family: var(--font-heading);
    font-size: 30px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
}

.genre-divider {
    height: 1px;
    background: var(--color-text-tertiary);
    margin-bottom: var(--space-md);
}

.genre-description {
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text-primary);
    margin-bottom: var(--space-md);
}

.genre-meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.genre-meta span {
    font-weight: 500;
}

/* ============================================
   SONG LIST
   ============================================ */

.song-list {
    display: flex;
    flex-direction: column;
}

.song-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-text-tertiary);
    transition: background-color var(--transition-medium);
}

.song-item:hover {
    background-color: var(--color-bg-surface);
}

.song-info {
    display: flex;
    gap: var(--space-md);
    flex: 1;
}

.rank {
    background: var(--color-text-tertiary);
    color: var(--color-text-primary);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    flex-shrink: 0;
}

.song-details {
    flex: 1;
}

.song-title {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.artist {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.song-blurb {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============================================
   SONG ACTIONS (Play & Vote)
   ============================================ */

.song-actions {
    display: flex;
    gap: var(--space-sm);
    align-items: flex-start;
    flex-shrink: 0;
}

.play-btn {
    width: 44px;
    height: 44px;
    background: transparent;
    border: 1px solid var(--color-text-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.play-btn:hover {
    border-color: var(--color-cosmic-orange);
    color: var(--color-cosmic-orange);
    box-shadow: 0 0 12px 2px rgba(245, 158, 11, 0.4);
}

.play-btn.playing {
    background: var(--color-cosmic-orange);
    border-color: var(--color-cosmic-orange);
    color: var(--color-bg-page);
}

/* Vote Buttons */
.vote-buttons {
    display: flex;
    gap: var(--space-xs);
}

.vote-up,
.vote-down {
    width: 44px;
    height: 44px;
    background: transparent;
    border: 1px solid var(--color-text-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.vote-up:hover {
    border-color: var(--color-vote-up);
    color: var(--color-vote-up);
}

.vote-down:hover {
    border-color: var(--color-vote-down);
    color: var(--color-vote-down);
}

.vote-up.voted {
    background: var(--color-vote-up);
    border-color: var(--color-vote-up);
    color: var(--color-bg-page);
    box-shadow: 0 0 10px 1px rgba(34, 197, 94, 0.5);
}

.vote-down.voted {
    background: var(--color-vote-down);
    border-color: var(--color-vote-down);
    color: var(--color-bg-page);
    box-shadow: 0 0 10px 1px rgba(239, 68, 68, 0.5);
}

/* ============================================
   STICKY MUSIC PLAYER
   ============================================ */

.music-player {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-bg-surface);
    border-top: 2px solid var(--color-cosmic-orange);
    padding: var(--space-md);
    z-index: 1000;
    transform: translateY(100%);
    transition: transform 0.3s ease-out;
    box-shadow: 0 -4px 20px rgba(217, 119, 6, 0.2);
}

.music-player.active {
    transform: translateY(0);
}

.player-content {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.now-playing {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.music-icon {
    color: var(--color-cosmic-orange);
    animation: rotate 8s linear infinite;
}

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

.track-info {
    display: flex;
    flex-direction: column;
}

.track-title {
    font-weight: 600;
    color: var(--color-text-primary);
    font-size: 16px;
}

.track-artist {
    font-size: 14px;
    color: var(--color-text-secondary);
}

.player-controls {
    display: flex;
    gap: var(--space-sm);
}

.control-btn {
    width: 48px;
    height: 48px;
    background: var(--color-cosmic-orange);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-bg-page);
    transition: all var(--transition-fast);
}

.control-btn:hover {
    background: var(--color-cosmic-orange-hover);
    box-shadow: 0 0 16px 4px rgba(245, 158, 11, 0.6);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    background: var(--color-bg-surface);
    padding: var(--space-lg) 0;
    border-top: 2px solid var(--color-text-tertiary);
    text-align: center;
    margin-top: var(--space-xxl);
}

.footer p {
    font-size: 12px;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xs);
}

.sources-note {
    font-size: 11px;
    color: var(--color-text-tertiary);
    font-style: italic;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 1024px) {
    .hero-title {
        font-size: 36px;
    }
    
    .genre-layout {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .genre-card {
        position: static;
    }
}

@media (max-width: 768px) {
    :root {
        --space-lg: 32px;
        --space-xl: 48px;
        --space-xxl: 64px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 14px;
    }
    
    .song-item {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .song-actions {
        width: 100%;
        justify-content: space-between;
    }
    
    .song-title {
        font-size: 20px;
    }
    
    .player-content {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .now-playing {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 22px;
    }
    
    .genre-title {
        font-size: 24px;
    }
    
    .song-title {
        font-size: 18px;
    }
    
    .intro-card {
        padding: var(--space-md);
    }
}