/* CSS Variables & Core Design System */
:root {
    --bg-main: #0B0E14;
    --bg-card: rgba(22, 28, 45, 0.4);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #FFFFFF;
    --text-secondary: #94A3B8;
    
    /* Neon Accents */
    --neon-blue: #00B0FF;
    --neon-purple: #D500F9;
    --neon-green: #00E676;
    --neon-yellow: #FFD600;
    --neon-cyan: #00E5FF;
    --neon-red: #FF1744;
    
    --shadow-blue: 0 0 15px rgba(0, 176, 255, 0.4);
    --shadow-purple: 0 0 15px rgba(213, 0, 249, 0.4);
    --shadow-green: 0 0 15px rgba(0, 230, 118, 0.4);
    --shadow-yellow: 0 0 15px rgba(255, 214, 0, 0.4);
    --shadow-cyan: 0 0 15px rgba(0, 229, 255, 0.4);
    --shadow-red: 0 0 15px rgba(255, 23, 68, 0.4);
    
    --font-header: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Bilingual Language Toggling Logic */
body.lang-en .lang-uk {
    display: none !important;
}

body.lang-uk .lang-en {
    display: none !important;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header & Floating Glass Navigation */
.glass-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(11, 14, 20, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.logo-text {
    font-family: var(--font-header);
    font-size: 20px;
    font-weight: 800;
    background: linear-gradient(135deg, #00B0FF, #00E676);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    font-size: 15px;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Glassmorphic Buttons */
.btn-lang {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    font-size: 14px;
}

.btn-lang:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-github {
    background: #24292F;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    padding: 8px 18px;
    border-radius: 20px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
}

.btn-github:hover {
    background: #1C2024;
    transform: translateY(-1px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-green));
    border: none;
    color: #000;
    padding: 12px 28px;
    border-radius: 30px;
    font-weight: 700;
    cursor: pointer;
    font-family: var(--font-header);
    text-decoration: none;
    font-size: 16px;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 230, 118, 0.3);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px 28px;
    border-radius: 30px;
    font-weight: 700;
    cursor: pointer;
    font-family: var(--font-header);
    text-decoration: none;
    font-size: 16px;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Hero Section */
.hero-section {
    padding-top: 140px;
    padding-bottom: 80px;
    background: radial-gradient(circle at 80% 20%, rgba(0, 176, 255, 0.08), transparent 40%),
                radial-gradient(circle at 20% 85%, rgba(0, 230, 118, 0.08), transparent 45%);
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: center;
}

.badge {
    background: rgba(0, 230, 118, 0.1);
    border: 1px solid rgba(0, 230, 118, 0.2);
    color: var(--neon-green);
    padding: 6px 14px;
    border-radius: 30px;
    font-size: 13px;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 24px;
}

.hero-content h1 {
    font-family: var(--font-header);
    font-size: 48px;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero-content p {
    color: var(--text-secondary);
    font-size: 18px;
    margin-bottom: 40px;
    max-width: 540px;
}

.hero-ctas {
    display: flex;
    gap: 16px;
}

/* Hero Screenshot Gallery with Dots */
.hero-gallery {
    position: relative;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.gallery-wrapper {
    width: 270px;
    height: 560px;
    position: relative;
    border-radius: 40px;
    border: 8px solid #222;
    background: #000;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5), 0 0 30px rgba(0, 230, 118, 0.15);
    overflow: hidden;
}

.gallery-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
    transition: opacity 0.6s ease-in-out;
}

.gallery-img.active {
    opacity: 1;
    z-index: 5;
}

.gallery-dots {
    display: flex;
    gap: 10px;
}

.gallery-dots .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    cursor: pointer;
    transition: all 0.3s ease;
}

.gallery-dots .dot.active {
    background: var(--neon-green);
    width: 24px;
    border-radius: 5px;
}

/* Generic Section Styles */
.section {
    padding: 100px 0;
}

.section-title {
    font-family: var(--font-header);
    font-size: 36px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.section-desc {
    color: var(--text-secondary);
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px auto;
    font-size: 16px;
}

/* Features Grid & Interactive Neon Cards */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 40px 32px;
    border-radius: 24px;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: transparent;
}

.feature-card:hover {
    transform: translateY(-8px);
    background: rgba(22, 28, 45, 0.6);
    border-color: rgba(255, 255, 255, 0.15);
}

.card-icon {
    font-size: 32px;
    margin-bottom: 24px;
}

.feature-card h3 {
    font-family: var(--font-header);
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.5;
}

/* Card Specific Themes */
.feature-card.neon-blue::before { background: var(--neon-blue); }
.feature-card.neon-blue:hover { box-shadow: var(--shadow-blue); }

.feature-card.neon-purple::before { background: var(--neon-purple); }
.feature-card.neon-purple:hover { box-shadow: var(--shadow-purple); }

.feature-card.neon-green::before { background: var(--neon-green); }
.feature-card.neon-green:hover { box-shadow: var(--shadow-green); }

.feature-card.neon-yellow::before { background: var(--neon-yellow); }
.feature-card.neon-yellow:hover { box-shadow: var(--shadow-yellow); }

.feature-card.neon-cyan::before { background: var(--neon-cyan); }
.feature-card.neon-cyan:hover { box-shadow: var(--shadow-cyan); }

.feature-card.neon-red::before { background: var(--neon-red); }
.feature-card.neon-red:hover { box-shadow: var(--shadow-red); }

/* Glass Cards & Glassmorphism */
.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 24px;
    padding: 40px;
}

/* Live Demo Interactive Card & Player */
.demo-section {
    background: radial-gradient(circle at 50% 50%, rgba(213, 0, 249, 0.04), transparent 50%);
}

.demo-card {
    max-width: 500px;
    margin: 0 auto;
    text-align: center;
    border-color: rgba(213, 0, 249, 0.2);
    box-shadow: 0 10px 40px rgba(0,0,0,0.4);
}

.demo-view {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

.demo-view.active {
    display: flex;
}

.demo-disc-wrapper {
    position: relative;
    padding: 20px;
}

.vinyl-disc {
    font-size: 140px;
    user-select: none;
    filter: drop-shadow(0 10px 20px rgba(0,0,0,0.6));
    transition: transform 0.1s linear;
}

.vinyl-disc.spinning {
    animation: spin 3s linear infinite;
}

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

.demo-header {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.score-board {
    font-family: var(--font-header);
    font-weight: 700;
    font-size: 18px;
    color: var(--neon-purple);
}

.demo-timer {
    width: 100%;
    height: 6px;
    background: rgba(255,255,255,0.06);
    border-radius: 3px;
    overflow: hidden;
}

#demo-timer-progress {
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, var(--neon-purple), var(--neon-cyan));
    transition: width 0.1s linear;
}

/* Music wave visualizer bars */
.music-wave {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 24px;
    margin-top: -10px;
}

.music-wave span {
    width: 3px;
    height: 4px;
    background: var(--neon-purple);
    border-radius: 1.5px;
    animation: jump 0.8s ease-in-out infinite alternate;
}

.music-wave span:nth-child(2) { animation-delay: 0.15s; }
.music-wave span:nth-child(3) { animation-delay: 0.3s; }
.music-wave span:nth-child(4) { animation-delay: 0.45s; }
.music-wave span:nth-child(5) { animation-delay: 0.6s; }

@keyframes jump {
    from { height: 4px; }
    to { height: 24px; }
}

.demo-options {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.btn-option {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 14px 20px;
    border-radius: 16px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
    text-align: left;
}

.btn-option:hover:not(:disabled) {
    background: rgba(255,255,255,0.08);
    border-color: rgba(255,255,255,0.2);
    transform: translateX(4px);
}

.btn-option.correct {
    background: rgba(0, 230, 118, 0.15) !important;
    border-color: var(--neon-green) !important;
    color: var(--neon-green) !important;
    box-shadow: 0 0 10px rgba(0, 230, 118, 0.2);
}

.btn-option.incorrect {
    background: rgba(255, 23, 68, 0.15) !important;
    border-color: var(--neon-red) !important;
    color: var(--neon-red) !important;
    box-shadow: 0 0 10px rgba(255, 23, 68, 0.2);
}

.final-score {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
}

/* Custom Packs Guide & Metadata Generator */
.packs-section {
    background: radial-gradient(circle at 10% 50%, rgba(0, 230, 118, 0.04), transparent 50%);
}

.packs-grid {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 40px;
    align-items: start;
}

.pack-guide h3, .pack-generator h3 {
    font-family: var(--font-header);
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 24px;
}

.pack-guide ol {
    padding-left: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.pack-guide li {
    font-size: 15px;
    color: var(--text-secondary);
}

.pack-guide code {
    background: rgba(255, 255, 255, 0.06);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    color: var(--text-primary);
}

/* Interactive Metadata Form Generator */
#meta-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: flex;
    gap: 20px;
}

.form-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input, .form-group select {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    border-radius: 12px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 15px;
    transition: all 0.3s ease;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--neon-green);
    background: rgba(255, 255, 255, 0.06);
}

.song-list-builder {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.song-list-builder h4 {
    font-size: 15px;
    font-weight: 700;
}

#songs-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.song-row {
    display: flex;
    gap: 12px;
}

.song-row input {
    flex: 1;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    padding: 10px 14px;
    border-radius: 10px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 14px;
    transition: all 0.3s ease;
}

.song-row input:focus {
    outline: none;
    border-color: var(--neon-green);
}

.btn-text {
    background: none;
    border: none;
    color: var(--neon-green);
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    align-self: flex-start;
    transition: opacity 0.3s ease;
}

.btn-text:hover {
    opacity: 0.8;
}

.btn-generate {
    width: 100%;
}

.json-output-wrapper {
    margin-top: 30px;
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

#json-output {
    display: block;
    background: #06090E;
    padding: 24px;
    overflow-x: auto;
    font-family: monospace;
    font-size: 13px;
    color: var(--neon-green);
    max-height: 250px;
}

.btn-copy {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 6px 14px;
    font-size: 12px;
    border-radius: 8px;
}

/* Telegram Community Banner Card */
.telegram-section {
    padding-top: 50px;
}

.telegram-banner {
    display: flex;
    align-items: center;
    gap: 40px;
    border-color: rgba(0, 176, 255, 0.2);
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

.telegram-icon {
    font-size: 64px;
}

.telegram-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
}

.telegram-content h2 {
    font-family: var(--font-header);
    font-size: 28px;
    font-weight: 800;
}

.telegram-content p {
    color: var(--text-secondary);
    font-size: 15px;
}

.btn-telegram {
    background: linear-gradient(135deg, #00B0FF, #0088cc);
}

.btn-telegram:hover {
    box-shadow: 0 4px 20px rgba(0, 176, 255, 0.3);
}

/* Footer style sheet */
footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    margin-top: 80px;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-secondary);
    font-size: 14px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--text-primary);
}

/* Responsive Layout Configurations */
@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    .hero-content p {
        margin-left: auto;
        margin-right: auto;
    }
    .hero-ctas {
        justify-content: center;
    }
    .packs-grid {
        grid-template-columns: 1fr;
    }
    .telegram-banner {
        flex-direction: column;
        text-align: center;
    }
    .telegram-content {
        align-items: center;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .hero-content h1 {
        font-size: 36px;
    }
    .footer-container {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}