/* ============================================================
   MidiEditor AI — Website Global Stylesheet (site.css)
   Shares DNA with manual/style.css but adds landing-page power.
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
    /* Core palette (inherited from manual) */
    --bg:            #0d1117;
    --bg-secondary:  #161b22;
    --bg-card:       #1c2129;
    --bg-card-hover: #242b35;
    --text:          #e6edf3;
    --text-muted:    #8b949e;
    --accent:        #58a6ff;
    --accent-hover:  #79c0ff;
    --border:        #30363d;
    --link:          #58a6ff;
    --link-hover:    #79c0ff;
    --code-bg:       #1c2129;

    /* NEW — gradient / glow accents */
    --gradient-hero:    linear-gradient(160deg, #0d1117 0%, #111820 40%, #151d28 70%, #0d1117 100%);
    --gradient-accent:  linear-gradient(135deg, #58a6ff, #a855f7);
    --gradient-rainbow: linear-gradient(90deg,
        #ff6b6b, #ffa94d, #ffd43b, #69db7c, #58a6ff, #a855f7, #f06595, #ff6b6b);
    --glow-blue:   0 0 30px rgba(88,166,255,0.15);
    --glow-purple: 0 0 30px rgba(168,85,247,0.15);

    /* Layout */
    --nav-height: 64px;
    --max-width:  1200px;
    --section-gap: 6rem;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-height) + 1rem); }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    font-size: 16px;
    overflow-x: hidden;
}

a { color: var(--link); text-decoration: none; transition: color .2s; }
a:hover { color: var(--link-hover); }

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

/* ---------- Utility ---------- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }
.text-gradient {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.sr-only {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0,0,0,0); border: 0;
}

/* =========================================================
   NAVIGATION — Sticky glassmorphism navbar
   ========================================================= */
.site-nav {
    position: fixed; top: 0; left: 0; right: 0;
    height: var(--nav-height);
    z-index: 1000;
    background: rgba(13,17,23,0.8);
    backdrop-filter: blur(16px) saturate(1.6);
    -webkit-backdrop-filter: blur(16px) saturate(1.6);
    border-bottom: 1px solid var(--border);
    transition: background .3s, box-shadow .3s;
}
.site-nav.scrolled {
    background: rgba(13,17,23,0.95);
    box-shadow: 0 4px 24px rgba(0,0,0,0.4);
}
.site-nav .container {
    display: flex; align-items: center; height: 100%;
}
.nav-brand {
    display: flex; align-items: center; gap: 0.6rem;
    font-weight: 700; font-size: 1.15rem; color: var(--text);
    text-decoration: none; flex-shrink: 0;
}
.nav-brand:hover { color: var(--accent); }
.nav-brand .brand-icon { font-size: 1.4rem; }
.nav-links {
    display: flex; align-items: center; gap: 0.2rem;
    margin-left: auto; list-style: none;
}
.nav-links a, .nav-links .nav-dropdown-trigger {
    display: inline-flex; align-items: center; gap: 0.3rem;
    padding: 0.45rem 0.85rem;
    border-radius: 8px;
    font-size: 0.9rem; font-weight: 500;
    color: var(--text-muted);
    text-decoration: none; cursor: pointer;
    transition: color .2s, background .2s;
}
.nav-links a:hover, .nav-links .nav-dropdown-trigger:hover,
.nav-links a.active {
    color: var(--text);
    background: rgba(255,255,255,0.06);
}
.nav-links a.active { color: var(--accent); }

/* Download CTA in nav */
.nav-cta {
    background: var(--gradient-accent) !important;
    color: #fff !important;
    font-weight: 600 !important;
    padding: 0.45rem 1.1rem !important;
    border-radius: 8px !important;
    transition: opacity .2s, transform .2s !important;
}
.nav-cta:hover { opacity: 0.9; transform: translateY(-1px); }

/* Dropdown */
.nav-dropdown {
    position: relative;
}
.nav-dropdown-menu {
    position: absolute; top: 100%; left: 0;
    min-width: 200px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.5rem;
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    opacity: 0; visibility: hidden;
    transform: translateY(8px);
    transition: opacity .2s, transform .2s, visibility .2s;
    z-index: 10;
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.open .nav-dropdown-menu {
    opacity: 1; visibility: visible; transform: translateY(0);
}
.nav-dropdown-menu a {
    display: block;
    padding: 0.5rem 0.8rem;
    border-radius: 6px;
    font-size: 0.88rem;
    color: var(--text-muted);
}
.nav-dropdown-menu a:hover {
    color: var(--text); background: rgba(255,255,255,0.06);
}

/* Hamburger (mobile) */
.nav-hamburger {
    display: none;
    background: none; border: none;
    color: var(--text); font-size: 1.5rem;
    cursor: pointer; padding: 0.3rem;
    margin-left: auto;
}
@media (max-width: 860px) {
    .nav-hamburger { display: block; }
    .nav-links {
        position: fixed; top: var(--nav-height); left: 0; right: 0;
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--border);
        flex-direction: column; align-items: stretch;
        padding: 0.5rem 1rem;
        transform: translateY(-110%);
        transition: transform .3s;
    }
    .nav-links.open { transform: translateY(0); }
    .nav-links a, .nav-links .nav-dropdown-trigger { padding: 0.7rem 0.5rem; }
    .nav-dropdown-menu {
        position: static; opacity: 1; visibility: visible;
        transform: none; box-shadow: none;
        border: none; background: transparent; padding: 0 0 0 1rem;
    }
}

/* =========================================================
   HERO SECTION
   ========================================================= */
.hero {
    min-height: calc(100vh - var(--nav-height));
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    text-align: center;
    padding: calc(var(--nav-height) + 3rem) 1.5rem 4rem;
    background: var(--gradient-hero);
    position: relative; overflow: hidden;
}

/* Subtle grid pattern behind hero */
.hero::before {
    content: '';
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(88,166,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(88,166,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

/* Logo container */
.hero-logo {
    position: relative;
    display: inline-block;
    margin-bottom: 1.5rem;
    border-radius: 16px;
    overflow: hidden;
    isolation: isolate; /* contain the blend mode */
}
.hero-logo img {
    display: block;
    max-width: min(700px, 90vw);
    height: auto;
    position: relative;
    z-index: 1;
}

/* ==== C64 / Amiga Rainbow Sweep Animation ====
   Uses mix-blend-mode: multiply — rainbow gradient × white text = rainbow text,
   rainbow gradient × black background = stays black.
   Requires the dark-background version of the logo (not transparent).
   No mask-image needed → works on file:// and https:// alike. */
.hero-logo::after {
    content: '';
    position: absolute; inset: 0;
    background: var(--gradient-rainbow);
    background-size: 300% 100%;
    mix-blend-mode: multiply;
    z-index: 2;
    pointer-events: none;
    animation: rainbow-sweep 4s linear infinite;
}
@keyframes rainbow-sweep {
    0%   { background-position: 0% 50%; }
    100% { background-position: 300% 50%; }
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
    .hero-logo::after { animation: none; opacity: 0; }
    .floating-notes { display: none; }
}

/* Hero text */
.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 0.75rem;
}
.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* Hero CTA buttons */
.hero-actions {
    display: flex; flex-wrap: wrap; gap: 1rem;
    justify-content: center;
    margin-bottom: 2.5rem;
}
.btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.75rem 1.6rem;
    border-radius: 10px;
    font-size: 1rem; font-weight: 600;
    text-decoration: none;
    transition: transform .2s, box-shadow .2s, opacity .2s;
    cursor: pointer; border: none;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
    background: var(--gradient-accent); color: #fff;
    box-shadow: 0 4px 20px rgba(88,166,255,0.25);
}
.btn-primary:hover { box-shadow: 0 6px 28px rgba(88,166,255,0.35); color: #fff; }
.btn-secondary {
    background: var(--bg-card); color: var(--text);
    border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

/* Hero version badge */
.hero-badge {
    display: inline-block;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.25rem 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

/* =========================================================
   FLOATING MUSIC NOTES (hero background)
   ========================================================= */
.floating-notes {
    position: absolute; inset: 0;
    pointer-events: none; overflow: hidden;
    z-index: 0;
}
.floating-notes .note {
    position: absolute;
    font-size: 1.5rem;
    opacity: 0;
    color: var(--accent);
    animation: float-up linear infinite;
}
@keyframes float-up {
    0%   { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    10%  { opacity: 0.15; }
    90%  { opacity: 0.15; }
    100% { transform: translateY(-10vh) rotate(360deg); opacity: 0; }
}

/* =========================================================
   SECTION BASE
   ========================================================= */
.section {
    padding: var(--section-gap) 0;
}
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}
.section-header h2 {
    font-size: clamp(1.5rem, 3.5vw, 2.2rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
    border: none; padding: 0;
}
.section-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}
.section:nth-child(even) {
    background: var(--bg-secondary);
}

/* =========================================================
   FEATURE CARDS
   ========================================================= */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}
.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 2rem 1.75rem;
    transition: transform .25s, border-color .25s, box-shadow .25s;
    /* reveal animation base */
    opacity: 0;
    transform: translateY(24px);
}
.feature-card.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity .5s ease-out, transform .5s ease-out, border-color .25s, box-shadow .25s;
}
.feature-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: var(--glow-blue);
}
.feature-card .card-icon {
    font-size: 2.2rem;
    margin-bottom: 0.75rem;
    display: inline-block;
    transition: transform .3s;
}
.feature-card:hover .card-icon {
    transform: scale(1.15) rotate(-5deg);
}
.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text);
    border: none; padding: 0;
}
.feature-card p {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.55;
}

/* =========================================================
   SHOWCASE — Screenshot Carousel
   ========================================================= */
.showcase {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    overflow: hidden;
    border-radius: 14px;
    border: 1px solid var(--border);
    background: var(--bg-card);
}
.showcase-track {
    display: flex;
    transition: transform .5s ease;
}
.showcase-slide {
    min-width: 100%;
    position: relative;
}
.showcase-slide img,
.showcase-slide video {
    width: 100%;
    display: block;
}
.showcase-slide .slide-caption {
    position: absolute; bottom: 0; left: 0; right: 0;
    padding: 1rem 1.5rem;
    background: linear-gradient(transparent, rgba(0,0,0,0.85));
    color: #fff; font-size: 0.95rem; font-weight: 500;
}
.showcase-btn {
    position: absolute; top: 50%; transform: translateY(-50%);
    background: rgba(0,0,0,0.6); border: none;
    color: #fff; font-size: 1.5rem;
    width: 44px; height: 44px;
    border-radius: 50%; cursor: pointer;
    transition: background .2s;
    z-index: 5;
}
.showcase-btn:hover { background: rgba(88,166,255,0.5); }
.showcase-btn.prev { left: 1rem; }
.showcase-btn.next { right: 1rem; }
.showcase-dots {
    display: flex; gap: 0.5rem;
    justify-content: center;
    padding: 1rem;
}
.showcase-dots .dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: var(--border);
    border: none; cursor: pointer;
    transition: background .2s;
}
.showcase-dots .dot.active { background: var(--accent); }

/* =========================================================
   STATS BAR — Animated counters
   ========================================================= */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1.5rem;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}
.stat-item .stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    display: block;
    margin-bottom: 0.25rem;
}
.stat-item .stat-label {
    font-size: 0.88rem;
    color: var(--text-muted);
}

/* =========================================================
   WHATS NEW — Latest release
   ========================================================= */
.whats-new {
    max-width: 700px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 2rem 2.5rem;
    position: relative;
}
.whats-new .latest-badge {
    position: absolute; top: -12px; left: 2rem;
    background: var(--gradient-accent);
    color: #fff; font-size: 0.75rem; font-weight: 700;
    padding: 0.25rem 0.8rem; border-radius: 999px;
    text-transform: uppercase; letter-spacing: 0.05em;
}
.whats-new h3 {
    font-size: 1.25rem; font-weight: 700;
    margin-bottom: 1rem;
    border: none; padding: 0;
}
.whats-new ul {
    list-style: none; padding: 0;
}
.whats-new li {
    padding: 0.4rem 0;
    color: var(--text-muted);
    font-size: 0.95rem;
}
.whats-new li::before {
    content: '•';
    color: var(--accent);
    font-weight: bold;
    margin-right: 0.6rem;
}
.whats-new .changelog-link {
    display: inline-block;
    margin-top: 1rem;
    font-weight: 600;
}

/* =========================================================
   COMPARISON TABLE
   ========================================================= */
.comparison-table {
    max-width: 700px;
    margin: 0 auto;
    border-collapse: collapse;
    width: 100%;
    font-size: 0.95rem;
}
.comparison-table th,
.comparison-table td {
    padding: 0.75rem 1.25rem;
    text-align: center;
    border-bottom: 1px solid var(--border);
}
.comparison-table th {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.comparison-table th:first-child,
.comparison-table td:first-child {
    text-align: left;
}
.comparison-table td:first-child {
    font-weight: 500;
}
.comparison-table .check { color: #4ade80; font-size: 1.2rem; }
.comparison-table .cross { color: var(--text-muted); opacity: 0.5; font-size: 1.2rem; }

/* =========================================================
   CHAT DEMO (reused from manual, slimmed down)
   ========================================================= */
.demo-container {
    max-width: 600px;
    margin: 0 auto;
}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer {
    padding: 3rem 0;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
    text-align: center;
}
.footer-links {
    display: flex; flex-wrap: wrap; gap: 1.5rem;
    justify-content: center;
    margin-bottom: 1.5rem;
}
.footer-links a {
    color: var(--text-muted); font-size: 0.9rem;
}
.footer-links a:hover { color: var(--accent); }
.footer-copy {
    color: var(--text-muted);
    font-size: 0.82rem;
}

/* =========================================================
   THEME PREVIEW SWITCHER
   ========================================================= */
.theme-switcher-bar {
    display: flex; gap: 0.5rem; justify-content: center;
    margin-bottom: 1.5rem;
}
.theme-switcher-bar button {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 0.4rem 1rem;
    color: var(--text-muted);
    font-size: 0.85rem; font-weight: 500;
    cursor: pointer;
    transition: border-color .2s, color .2s;
}
.theme-switcher-bar button.active,
.theme-switcher-bar button:hover {
    border-color: var(--accent);
    color: var(--text);
}
.theme-preview-frame {
    position: relative;
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid var(--border);
    max-width: 800px;
    margin: 0 auto;
}
.theme-preview-frame img {
    display: block; width: 100%;
    transition: opacity .4s;
}

/* =========================================================
   SCROLL ANIMATIONS (Intersection Observer helper)
   ========================================================= */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity .6s ease-out, transform .6s ease-out;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================================
   SCROLL TO TOP
   ========================================================= */
.scroll-top {
    position: fixed; bottom: 2rem; right: 2rem;
    width: 44px; height: 44px;
    background: var(--accent); color: #fff; border: none;
    border-radius: 50%; font-size: 1.3rem;
    cursor: pointer;
    opacity: 0; visibility: hidden;
    transform: translateY(12px);
    transition: opacity .3s, visibility .3s, transform .3s, background .2s;
    z-index: 999;
    box-shadow: 0 4px 16px rgba(0,0,0,0.4);
    display: flex; align-items: center; justify-content: center;
}
.scroll-top.visible {
    opacity: 1; visibility: visible; transform: translateY(0);
}
.scroll-top:hover { background: var(--accent-hover); }