/* ==========================================================================
   Myusiq — Material 3 Expressive Design System
   ========================================================================== */

:root {
    /* M3 Dark Expressive Palette (Default) */
    --primary: #A78BFA;
    --on-primary: #1E005B;
    --primary-container: #2E1065;
    --on-primary-container: #F5F3FF;
    --secondary: #38BDF8;
    --on-secondary: #003548;
    --surface: #090D16;
    --surface-container: #131B2E;
    --surface-container-high: #1E293B;
    --on-surface: #F8FAFC;
    --on-surface-variant: #94A3B8;
    --outline: #334155;
    --outline-variant: #1E293B;
    --shadow: rgba(0, 0, 0, 0.6);
    --glow-primary: rgba(167, 139, 250, 0.25);
    --glass-bg: rgba(19, 27, 46, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-radius: 24px;
    --button-radius: 100px;
}

/* Light Mode Overrides */
.light-mode {
    --primary: #6D28D9;
    --on-primary: #FFFFFF;
    --primary-container: #EDE9FE;
    --on-primary-container: #2E1065;
    --secondary: #0284C7;
    --on-secondary: #FFFFFF;
    --surface: #F8FAFC;
    --surface-container: #FFFFFF;
    --surface-container-high: #F1F5F9;
    --on-surface: #0F172A;
    --on-surface-variant: #475569;
    --outline: #CBD5E1;
    --outline-variant: #E2E8F0;
    --shadow: rgba(0, 0, 0, 0.08);
    --glow-primary: rgba(109, 40, 217, 0.15);
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(0, 0, 0, 0.08);
}

/* --- Base & Reset --- */
html {
    scroll-behavior: smooth;
}

/* --- Scroll Reading Progress Bar --- */
#scroll-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    z-index: 1002;
    transition: width 0.1s linear;
    box-shadow: 0 0 10px var(--primary);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

/* --- Major Version Announcement Banner --- */
.announcement-banner {
    background: linear-gradient(90deg, #6D28D9 0%, #A78BFA 50%, #38BDF8 100%);
    color: #FFFFFF;
    padding: 10px 20px;
    text-align: center;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.92rem;
    font-weight: 600;
    position: relative;
    z-index: 1001;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    box-shadow: 0 4px 20px rgba(109, 40, 217, 0.4);
}

.announcement-banner .banner-badge {
    background: rgba(255, 255, 255, 0.25);
    padding: 3px 10px;
    border-radius: 100px;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    backdrop-filter: blur(4px);
}

.announcement-banner .banner-link {
    color: #FFFFFF;
    text-decoration: underline;
    font-weight: 700;
    margin-left: 6px;
}

.announcement-banner .banner-close {
    background: none;
    border: none;
    color: #FFFFFF;
    font-size: 1.3rem;
    cursor: pointer;
    margin-left: auto;
    opacity: 0.8;
    line-height: 1;
}

.announcement-banner .banner-close:hover {
    opacity: 1;
}

body {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 400;
    letter-spacing: -0.02em;
    background-color: var(--surface);
    color: var(--on-surface);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, .brand-font {
    font-family: 'Syne', sans-serif;
    letter-spacing: -0.03em;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

/* --- Glassmorphic Card Styling --- */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--card-radius);
    padding: 32px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 30px var(--shadow);
}

.glass-card:hover {
    border-color: var(--primary);
    box-shadow: 0 15px 35px var(--glow-primary);
}

/* --- Section Headers --- */
.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 56px auto;
}

.section-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 100px;
    background: var(--primary-container);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
    border: 1px solid var(--primary);
}

.section-title {
    font-size: 2.75rem;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.2;
}

.section-subtitle {
    font-size: 1.15rem;
    color: var(--on-surface-variant);
}

/* --- Navbar --- */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 20px 0;
    transition: padding 0.3s ease, background 0.3s ease;
}

#navbar.scrolled {
    padding: 12px 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.35rem;
    font-weight: 800;
}

.nav-logo img {
    width: 36px;
    height: 36px;
}

.theme-toggle-btn {
    background: var(--surface-container);
    border: 1px solid var(--outline);
    width: 42px !important;
    height: 42px !important;
    min-width: 42px !important;
    padding: 0 !important;
    border-radius: 50% !important;
    cursor: pointer;
    display: flex !important;
    align-items: center;
    justify-content: center;
    color: var(--on-surface);
    flex-shrink: 0;
}

.theme-toggle-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.theme-toggle-btn .sun-icon { display: block; width: 22px; height: 22px; stroke: currentColor; fill: none; }
.theme-toggle-btn .moon-icon { display: none; width: 22px; height: 22px; stroke: currentColor; fill: none; }

.light-mode .theme-toggle-btn .sun-icon { display: none !important; }
.light-mode .theme-toggle-btn .moon-icon { display: block !important; }

/* Buttons */
button, input, select {
    font-family: 'Space Grotesk', sans-serif;
}

.btn {
    font-family: 'Space Grotesk', sans-serif !important;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--button-radius);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--primary);
    color: var(--on-primary);
    box-shadow: 0 4px 20px var(--glow-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px var(--glow-primary);
}

.btn-outlined {
    background: transparent;
    border-color: var(--outline);
    color: var(--on-surface);
}

.btn-outlined:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* --- Hero Section --- */
.hero {
    padding: 160px 0 100px 0;
    position: relative;
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: center;
}

.hero-text h1 {
    font-size: 3.8rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--on-surface) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text p {
    font-size: 1.25rem;
    color: var(--on-surface-variant);
    margin-bottom: 32px;
    max-width: 580px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

/* Phone Frame Mockup with 3D Tilt & Audio Wave Canvas */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    min-height: 570px;
}

#scroll-audio-canvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 140%;
    height: 140%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.6;
}

.phone-3d-wrapper {
    perspective: 1000px;
    z-index: 1;
}

.phone-frame {
    width: 280px;
    height: 570px;
    background: #000;
    border-radius: 44px;
    border: 12px solid #1E293B;
    box-shadow: 0 25px 60px rgba(0,0,0,0.8), 0 0 50px var(--glow-primary);
    position: relative;
    overflow: hidden;
    transform-style: preserve-3d;
    transition: transform 0.15s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.3s ease;
    will-change: transform;
}

.phone-notch {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 20px;
    background: #1E293B;
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
    z-index: 10;
}

.phone-screen {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Theme Sandbox Widget */
.theme-widget {
    background: var(--surface-container);
    border: 1px solid var(--outline);
    border-radius: 20px;
    padding: 16px 20px;
    display: inline-block;
}

.color-dot {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: inline-block;
    margin: 0 6px;
    cursor: pointer;
    border: 2px solid transparent;
}

.color-dot.active {
    border-color: var(--on-surface);
    transform: scale(1.15);
}

/* --- Features Grid & Interactive Cards --- */
.features-section {
    padding: 100px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 32px;
}

.feature-card .icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: block;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--on-surface-variant);
    font-size: 1rem;
}

/* Interactive EQ Visualizer Card */
.eq-container {
    margin-top: 24px;
    background: var(--surface-container);
    border-radius: 16px;
    padding: 20px;
    border: 1px solid var(--outline-variant);
}

.eq-svg-wrap {
    width: 100%;
    height: 80px;
    margin-bottom: 16px;
}

.eq-controls {
    display: flex;
    justify-content: space-between;
    gap: 12px;
}

.eq-band {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.eq-slider {
    writing-mode: vertical-lr;
    direction: rtl;
    -webkit-appearance: slider-vertical;
    width: 24px;
    height: 90px;
    padding: 0 !important;
    margin: 0;
    accent-color: var(--primary);
    cursor: pointer;
    background: transparent;
}

.eq-badge {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--on-surface-variant);
}

.preset-btns {
    display: flex;
    gap: 8px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.preset-btn {
    padding: 4px 12px;
    border-radius: 100px;
    background: var(--surface-container-high);
    border: 1px solid var(--outline);
    color: var(--on-surface);
    font-size: 0.8rem;
    cursor: pointer;
}

.preset-btn.active, .preset-btn:hover {
    background: var(--primary);
    color: var(--on-primary);
    border-color: var(--primary);
}

/* Janitor Interactive Demo Card */
.janitor-demo-card {
    margin-top: 24px;
    background: var(--surface-container);
    border-radius: 16px;
    padding: 20px;
    border: 1px solid var(--outline-variant);
}

.janitor-track-info {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.janitor-art {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    background: var(--outline);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    overflow: hidden;
}

.repaired .janitor-art {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
}

/* Tap-to-Sync Karaoke Lyric Scroll Demo Card */
.lyric-scroll-demo {
    margin-top: 24px;
    background: var(--surface-container);
    border-radius: 16px;
    padding: 16px;
    border: 1px solid var(--outline-variant);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.lyric-line-item {
    font-size: 0.9rem;
    color: var(--on-surface-variant);
    padding: 10px 14px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.02);
    transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 12px;
    border: 1px solid transparent;
}

.lyric-stamp {
    font-family: 'Space Grotesk', monospace;
    font-size: 0.78rem;
    color: var(--primary);
    opacity: 0.8;
    flex-shrink: 0;
    font-weight: 700;
}

.lyric-text {
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary) var(--lyric-fill-percent, 0%), var(--on-surface-variant) var(--lyric-fill-percent, 0%));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: background 0.1s linear;
}

.lyric-line-item.active {
    background: var(--surface-container-high);
    border-color: var(--primary);
    box-shadow: 0 4px 15px var(--glow-primary);
    transform: translateX(8px);
}

.lyric-line-item.active .lyric-text {
    font-weight: 700;
}

/* --- Screenshot Gallery --- */
.gallery-section {
    padding: 100px 0;
    background: var(--surface-container);
}

.gallery-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.gallery-tab {
    padding: 10px 24px;
    border-radius: 100px;
    background: var(--surface);
    border: 1px solid var(--outline);
    color: var(--on-surface-variant);
    font-weight: 700;
    cursor: pointer;
}

.gallery-tab.active, .gallery-tab:hover {
    background: var(--primary);
    color: var(--on-primary);
    border-color: var(--primary);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.screenshot-card {
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid var(--outline);
    cursor: pointer;
    position: relative;
    aspect-ratio: 9 / 19.5;
    background: var(--surface-container);
}

.screenshot-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.screenshot-card:hover {
    transform: scale(1.03);
    border-color: var(--primary);
    box-shadow: 0 10px 30px var(--glow-primary);
}

/* --- Lightbox Modal --- */
#lightbox-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

#lightbox-img {
    max-width: 90%;
    max-height: 85vh;
    border-radius: 24px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.8);
}

.lightbox-close {
    position: absolute;
    top: 24px;
    right: 24px;
    font-size: 2.5rem;
    color: #FFF;
    cursor: pointer;
}

/* --- Reveal Animation --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.animate-fade-in {
    animation: fadeIn 0.4s ease forwards;
}

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

/* --- Responsive Media Queries --- */
@media (max-width: 900px) {
    .hero {
        padding: 120px 0 60px 0;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

    .hero-text h1 {
        font-size: 2.8rem;
    }

    .hero-text p {
        margin: 0 auto 28px auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .phone-frame {
        width: 240px;
        height: 500px;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 0 16px;
    }

    /* Navbar optimization for mobile */
    #navbar {
        padding: 12px 0;
    }

    .nav-logo {
        font-size: 1.15rem;
        gap: 8px;
    }

    .nav-logo img {
        width: 28px;
        height: 28px;
    }

    .nav-container .btn-outlined {
        display: none;
    }

    .nav-container .btn-primary {
        padding: 8px 16px;
        font-size: 0.85rem;
    }

    /* Hero adjustments */
    .hero {
        padding: 100px 0 40px 0;
    }

    .hero-text h1 {
        font-size: 2.1rem;
        line-height: 1.15;
    }

    .hero-text p {
        font-size: 1rem;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .phone-frame {
        width: 200px;
        height: 420px;
        border-width: 8px;
        border-radius: 32px;
    }

    .phone-notch {
        width: 80px;
        height: 16px;
    }

    /* Section & Cards */
    .section-header {
        margin-bottom: 36px;
    }

    .section-title {
        font-size: 1.85rem;
    }

    .section-subtitle {
        font-size: 0.95rem;
    }

    .glass-card {
        padding: 20px 16px;
        border-radius: 20px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    /* EQ Sliders Mobile layout */
    .eq-container {
        padding: 12px;
    }

    .eq-controls {
        gap: 4px;
    }

    .eq-slider {
        height: 60px;
    }

    .eq-badge {
        font-size: 0.65rem;
    }

    .preset-btns {
        justify-content: center;
    }

    .preset-btn {
        padding: 6px 10px;
        font-size: 0.75rem;
    }

    /* Gallery Grid: 2 columns on mobile */
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .gallery-tabs {
        gap: 6px;
        overflow-x: auto;
        justify-content: flex-start;
        padding-bottom: 8px;
        -webkit-overflow-scrolling: touch;
    }

    .gallery-tab {
        padding: 6px 16px;
        font-size: 0.8rem;
        white-space: nowrap;
        flex-shrink: 0;
    }

    /* Timeline Mobile */
    .timeline::before {
        left: 12px;
    }

    .timeline-item {
        padding-left: 32px;
        margin-bottom: 28px;
    }

    .timeline-dot {
        left: 4px;
        width: 14px;
        height: 14px;
        top: 20px;
    }

    .version-badge {
        font-size: 1.05rem;
    }

    .changelog-list li {
        font-size: 0.9rem;
    }

    /* Lightbox Modal */
    #lightbox-modal {
        padding: 12px;
    }

    #lightbox-img {
        max-width: 95%;
        max-height: 80vh;
        border-radius: 16px;
    }

    .lightbox-close {
        top: 16px;
        right: 16px;
        font-size: 2rem;
    }

    /* Footer Mobile */
    footer {
        padding: 40px 0 20px 0;
    }

    footer .container {
        flex-direction: column;
        text-align: center;
        gap: 16px;
    }
}

/* Blog Announcement / Latest Release Spotlight */
.blog-announcement-section {
    padding: 60px 0 20px 0;
    position: relative;
    z-index: 2;
}

.blog-card {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.75) 0%, rgba(15, 23, 42, 0.9) 100%);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 28px;
    padding: 36px 40px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(20px);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.blog-card:hover {
    border-color: rgba(167, 139, 250, 0.4);
    transform: translateY(-4px);
}

.blog-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
}

.blog-badge-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
}

.blog-badge {
    background: linear-gradient(135deg, #a78bfa 0%, #7c3aed 100%);
    color: #ffffff;
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 6px 14px;
    border-radius: 20px;
    box-shadow: 0 4px 12px rgba(124, 58, 237, 0.3);
}

.blog-version {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary);
}

.blog-date {
    font-size: 0.9rem;
    color: var(--on-surface-variant);
}

.blog-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.blog-intro {
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--on-surface);
    margin-bottom: 24px;
}

.blog-highlights-box {
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    padding: 24px 28px;
    margin-bottom: 28px;
}

.blog-highlights-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 14px;
}

.blog-items-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.blog-items-list li {
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--on-surface-variant);
    position: relative;
    padding-left: 24px;
}

.blog-items-list li::before {
    content: "•";
    color: var(--primary);
    font-size: 1.4rem;
    position: absolute;
    left: 4px;
    top: -2px;
}

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