/* =========================================================
   Muraena Design System v1.0
   Tokens · Layout · Components · Video · Responsive
========================================================= */

/* -----------------------------
   1. Design Tokens (Light Theme)
------------------------------ */

:root {
    /* Colors */
    --bg: #f3f4f6;
    --bg-alt: #e5e7eb;
    --surface: #ffffff;
    --surface-soft: #f9fafb;
    --text: #0f172a;
    --text-muted: #6b7280;
    --primary: #2563eb;
    --primary-soft: #93c5fd;
    --accent: #22c55e;
    --border: #d1d5db;

    /* Radii */
    --radius: 16px;
    --radius-lg: 22px;

    /* Shadows */
    --shadow-soft: 0 18px 45px rgba(15,23,42,0.08);

    /* Layout */
    --container: 1360px;

    /* Typography */
    --font: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

/* -----------------------------
   2. Dark Theme Tokens
------------------------------ */

body[data-theme="dark"] {
    --bg: #020617;
    --bg-alt: #020617;
    --surface: #020617;
    --surface-soft: #020617;
    --text: #e5e7eb;
    --text-muted: #9ca3af;
    --primary: #38bdf8;
    --primary-soft: #0ea5e9;
    --accent: #22c55e;
    --border: #1f2937;
    --shadow-soft: 0 24px 60px rgba(0,0,0,0.65);
}

/* -----------------------------
   3. Reset & Base
------------------------------ */

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

html,
body {
    height: 100%;
}

body {
    background: linear-gradient(
        180deg,
        color-mix(in srgb, var(--bg) 90%, transparent) 0%,
        color-mix(in srgb, var(--bg-alt) 90%, transparent) 100%
    );
    color: var(--text);
    font-family: var(--font);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* -----------------------------
   4. Layout
------------------------------ */

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

.main {
    padding: 56px 0 80px;
}

/* -----------------------------
   5. Background Canvas (WebGL)
------------------------------ */

#bgCanvas {
    position: fixed;
    inset: 0;
    z-index: -1;
}

/* -----------------------------
   6. Header
------------------------------ */

.header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: color-mix(in srgb, var(--bg) 80%, transparent);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
}

.header-inner {
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-weight: 700;
    font-size: 16px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.nav {
    display: flex;
    gap: 28px;
    font-size: 14px;
}

.nav a {
    color: var(--text-muted);
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.theme-toggle {
    border-radius: 999px;
    border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
    background: color-mix(in srgb, var(--surface) 80%, transparent);
    color: var(--text);
    padding: 6px 10px;
    cursor: pointer;
    font-size: 14px;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 22px;
}

/* -----------------------------
   7. Hero Section
------------------------------ */

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 48px;
    align-items: center;
    padding: 40px 0 80px;
    perspective: 1200px;
}

.hero-text h1 {
    font-size: 46px;
    line-height: 1.15;
    margin-bottom: 18px;
}

.hero-text p {
    max-width: 560px;
    font-size: 18px;
    color: var(--text-muted);
}

.hero-subnote {
    margin-top: 12px;
    font-size: 13px;
    color: var(--text-muted);
}

.cta {
    display: flex;
    gap: 14px;
    margin-top: 18px;
}

/* Hero media 3D feel */

.hero-media {
    transform-style: preserve-3d;
    transition: transform 0.6s ease;
}

.hero-media:hover {
    transform: rotateY(6deg) rotateX(3deg);
}

/* -----------------------------
   8. Buttons
------------------------------ */

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 22px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #ffffff;
    box-shadow: 0 14px 35px color-mix(in srgb, var(--primary-soft) 60%, transparent);
}

.btn-primary:hover {
    filter: brightness(1.05);
}

.btn-secondary {
    background: color-mix(in srgb, var(--surface-soft) 80%, transparent);
    border-color: color-mix(in srgb, var(--border) 70%, transparent);
    color: var(--text);
}

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

/* -----------------------------
   9. Hero Media / Video
------------------------------ */

.hero-caption {
    margin-top: 10px;
    font-size: 13px;
    color: var(--text-muted);
}

/* Base hero media wrapper (for non‑premium fallback if нужно)
   .hero-media .video-wrapper { ... } — переопределяется ниже
*/

/* -----------------------------------------------------------
   10. PREMIUM VIDEO SYSTEM
   Crossfade · Blur · GPU Acceleration
----------------------------------------------------------- */

.video-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
    background: #000;
    transform: translateZ(0);
}

#heroVideo,
#heroVideoNext {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    border-radius: inherit;
    opacity: 1;
    transition: opacity 1.2s ease;
    will-change: opacity;
    transform: translateZ(0);
}

#heroVideoNext {
    opacity: 0;
}

#videoOverlay {
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
    backdrop-filter: blur(0px);
    background: rgba(255,255,255,0);
    transition: backdrop-filter 0.6s ease, background 0.6s ease;
}

#videoOverlay.flash {
    backdrop-filter: blur(14px);
    background: rgba(255,255,255,0.25);
}

/* Dark theme glow around video */

body[data-theme="dark"] .video-wrapper {
    box-shadow: 0 0 25px rgba(56,189,248,0.25);
}

/* -----------------------------
   11. Grid Cards
------------------------------ */

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
    margin: 40px 0 56px;
}

.card {
    position: relative;
    background: linear-gradient(145deg, var(--surface), var(--surface-soft));
    border-radius: var(--radius);
    padding: 20px 20px 22px;
    border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
}

/* Dark theme card background */

body[data-theme="dark"] .card {
    background: radial-gradient(circle at top left, #0b1220, #020617);
}

/* Neon inner glow on hover */

.card::before {
    content: "";
    position: absolute;
    inset: -40%;
    background: radial-gradient(
        circle at top,
        color-mix(in srgb, var(--primary-soft) 40%, transparent),
        transparent 60%
    );
    opacity: 0;
    transition: opacity 0.25s ease;
}

.card:hover::before {
    opacity: 1;
}

.card::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(
        circle at top left,
        color-mix(in srgb, var(--primary-soft) 25%, transparent),
        transparent 70%
    );
    opacity: 0;
    transition: opacity 0.35s ease;
}

.card:hover::after {
    opacity: 1;
}

.card h3 {
    position: relative;
    font-size: 18px;
    margin-bottom: 8px;
    z-index: 1;
}

.card p {
    position: relative;
    font-size: 14px;
    color: var(--text-muted);
    z-index: 1;
}

/* -----------------------------
   12. Steps / Trust / CTA
------------------------------ */

.steps {
    margin: 40px 0;
}

.steps h2,
.trust h2 {
    font-size: 22px;
    margin-bottom: 12px;
}

.steps ol {
    padding-left: 20px;
    font-size: 14px;
    color: var(--text-muted);
}

.trust {
    margin: 40px 0;
}

.trust p {
    max-width: 560px;
    font-size: 14px;
    color: var(--text-muted);
}

.cta-final {
    margin-top: 40px;
    text-align: center;
}

.cta-final h2 {
    font-size: 24px;
    margin-bottom: 12px;
}

/* -----------------------------
   13. Footer
------------------------------ */

.footer {
    background: var(--bg-alt);
    padding: 32px 0 40px;
    border-top: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 24px;
    font-size: 13px;
    margin-bottom: 16px;
}

.footer h4 {
    font-size: 14px;
    margin-bottom: 8px;
}

.footer a {
    display: block;
    opacity: 0.8;
    margin-bottom: 4px;
}

.footer a:hover {
    opacity: 1;
}

.footer-copy {
    font-size: 12px;
    opacity: 0.6;
    text-align: center;
}

/* -----------------------------
   14. Responsive
------------------------------ */

@media (max-width: 1024px) {
    .hero {
        grid-template-columns: minmax(0, 1fr);
    }

    .grid-3 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .nav {
        display: none;
    }

    body.nav-open .nav {
        display: flex;
        position: absolute;
        top: 72px;
        right: 16px;
        flex-direction: column;
        background: var(--surface);
        padding: 12px 16px;
        border-radius: 14px;
        border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
        gap: 10px;
        box-shadow: var(--shadow-soft);
    }

    .mobile-toggle {
        display: block;
    }

    .grid-3 {
        grid-template-columns: minmax(0, 1fr);
    }

    .hero-text h1 {
        font-size: 32px;
    }
}