:root {
  color-scheme: dark;
  --bg: #0f0f1a;
  --bg-2: #161629;
  --surface: rgba(255, 255, 255, 0.05);
  --surface-2: rgba(255, 255, 255, 0.09);
  --border: rgba(255, 255, 255, 0.12);
  --text: #f2f3fa;
  --muted: #b5bcd6;
  --accent: #7c6cf0;
  --accent-2: #4f8cff;
  --accent-text: #c7cdff;
  --grad: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  --radius: 12px;
  --max: 1080px;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    color-scheme: light;
    --bg: #f5f6fb;
    --bg-2: #eceef8;
    --surface: #ffffff;
    --surface-2: #f0f1f9;
    --border: rgba(20, 22, 50, 0.12);
    --text: #161829;
    --muted: #4d5470;
    --accent: #6556e0;
    --accent-2: #2f6fe0;
    --accent-text: #4a3fc0;
    --shadow: 0 18px 40px rgba(40, 45, 90, 0.16);
  }
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f5f6fb;
  --bg-2: #eceef8;
  --surface: #ffffff;
  --surface-2: #f0f1f9;
  --border: rgba(20, 22, 50, 0.12);
  --text: #161829;
  --muted: #4d5470;
  --accent: #6556e0;
  --accent-2: #2f6fe0;
  --accent-text: #4a3fc0;
  --shadow: 0 18px 40px rgba(40, 45, 90, 0.16);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  background-image: linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
  background-repeat: no-repeat;
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
}

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

a {
  color: var(--accent-text);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
a:hover { color: var(--text); }

code {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
  padding: 1px 6px;
  border-radius: 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  word-break: break-word;
}

:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
  border-radius: 4px;
}

h1, h2, h3 { line-height: 1.2; margin: 0 0 0.5em; font-weight: 750; }
h1 { font-size: clamp(2.8rem, 9vw, 4.8rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.7rem, 4.5vw, 2.3rem); letter-spacing: -0.01em; }
h3 { font-size: 1.1rem; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 16px;
}
.narrow { max-width: 760px; }

.skip {
  position: absolute;
  left: 16px;
  top: -60px;
  background: var(--accent);
  color: #fff;
  padding: 8px 14px;
  border-radius: 8px;
  z-index: 20;
  text-decoration: none;
}
.skip:focus { top: 12px; }

/* Sticky top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 16px;
  min-height: 56px;
  padding-top: 8px;
  padding-bottom: 8px;
}
.brand {
  font-weight: 800;
  font-size: 1.1rem;
  text-decoration: none;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.topbar nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
}
.topbar nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  padding: 4px 2px;
}
.topbar nav a:hover { color: var(--text); text-decoration: underline; }

/* Hero */
.hero {
  padding: 64px 0 40px;
  text-align: center;
  background:
    radial-gradient(60% 50% at 50% 0%, color-mix(in srgb, var(--accent) 28%, transparent) 0%, transparent 70%),
    radial-gradient(40% 40% at 85% 10%, color-mix(in srgb, var(--accent-2) 18%, transparent) 0%, transparent 70%);
}
.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.eyebrow {
  color: var(--accent-text);
  font-size: 0.9rem;
  font-weight: 650;
  letter-spacing: 0.02em;
  margin-bottom: 12px;
}
.hero h1 {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 14px;
}
.lead {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 36em;
  margin: 0 auto;
}
.cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 28px 0 16px;
  width: 100%;
}
.note {
  font-size: 0.9rem;
  color: var(--muted);
  max-width: 36em;
  margin: 0 auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 10px 24px;
  border-radius: 10px;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background-color 0.15s ease;
}
.btn-primary {
  color: #fff;
  background: var(--grad);
  box-shadow: 0 10px 28px color-mix(in srgb, var(--accent) 40%, transparent);
}
.btn-primary:hover { color: #fff; transform: translateY(-1px); }
.btn-ghost {
  color: var(--text);
  background: var(--surface);
  border-color: var(--border);
}
.btn-ghost:hover { color: var(--text); background: var(--surface-2); }

.frame {
  margin: 44px auto 0;
  width: 100%;
  max-width: 600px;
  padding: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.frame img {
  width: 100%;
  border-radius: 10px;
}

/* Sections */
.section { padding: 64px 0; }
.section.alt {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.section-lead {
  color: var(--muted);
  max-width: 44em;
  margin-bottom: 28px;
}

/* Cards */
.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.card p { color: var(--muted); font-size: 0.96rem; }

.engine h3 {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Steps */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.step p { color: var(--muted); font-size: 0.96rem; }
.step-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  font-weight: 800;
  color: #fff;
  background: var(--grad);
}

/* Gallery */
.gallery {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
}
.shot {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px;
}
.shot img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.shot figcaption {
  padding: 10px 4px 2px;
  font-weight: 650;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Languages */
.langs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.langs li {
  font-size: 0.92rem;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

/* FAQ */
.faq {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
}
.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 52px 16px 20px;
  font-weight: 700;
  position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--accent-text);
}
.faq[open] summary::after { content: "\2212"; }
.faq-body {
  padding: 0 20px 18px;
  color: var(--muted);
}
.faq-body strong { color: var(--text); }

/* Warning */
.warn-section { padding-top: 0; }
.warn {
  background: color-mix(in srgb, #f5a524 12%, var(--surface));
  border: 1px solid color-mix(in srgb, #f5a524 45%, transparent);
  border-left: 4px solid #f5a524;
  border-radius: var(--radius);
  padding: 20px 22px;
}
.warn h2 { font-size: 1.2rem; margin-bottom: 8px; }
.warn p { color: var(--muted); margin: 0; }
.warn strong { color: var(--text); }

/* Footer */
.footer {
  padding: 32px 0 40px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.92rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px 24px;
}
.footer-brand { color: var(--text); font-weight: 650; }
.footer-note { font-size: 0.88rem; max-width: 46em; }
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: flex-start;
}

/* Breakpoints */
@media (min-width: 640px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .btn { width: auto; }
}
@media (min-width: 900px) {
  .hero { padding: 88px 0 64px; }
  .grid { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .gallery { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 480px) {
  .wrap { padding: 0 16px; }
  .cta { flex-direction: column; align-items: stretch; }
  .btn { width: 100%; }
  .topbar nav { gap: 4px 12px; }
  .frame { padding: 6px; }
}