:root {
  --bg: #fbfaf7;
  --panel: #ffffff;
  --text: #23262b;
  --muted: #5d636c;
  --line: #e3dfd7;
  --accent: #2f6fd6;
  --accent-text: #ffffff;
  --code: #f3f1ec;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --panel: #1d2024;
    --text: #e8e6e1;
    --muted: #a3a8b0;
    --line: #2e3238;
    --accent: #6d9ff0;
    --accent-text: #0e1116;
    --code: #24282e;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; border-radius: 10px; }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.9em; }
code { background: var(--code); padding: 0.1em 0.35em; border-radius: 4px; }
pre { background: var(--code); padding: 14px 16px; border-radius: 10px; overflow-x: auto; line-height: 1.5; }
pre code { background: none; padding: 0; }

.top {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 10px max(16px, calc((100% - 1160px) / 2));
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--text); text-decoration: none; }
.brand svg { width: 24px; height: 24px; fill: var(--accent); }
nav { display: flex; gap: 18px; flex-wrap: wrap; align-items: center; font-size: 15px; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--text); }
nav .gh { color: var(--accent); font-weight: 600; }

main { max-width: 1160px; margin: 0 auto; padding: 0 16px; }
section { padding: 56px 0 8px; }
h1 { font-size: clamp(32px, 5vw, 52px); line-height: 1.1; margin: 0 0 18px; letter-spacing: -0.02em; }
h2 { font-size: clamp(24px, 3vw, 32px); margin: 0 0 14px; letter-spacing: -0.01em; }
h3 { margin: 0 0 8px; font-size: 19px; }
.lead { font-size: 20px; color: var(--muted); margin: 0 0 22px; }
.small { font-size: 14px; color: var(--muted); }

.hero { display: grid; grid-template-columns: 1fr 1.25fr; gap: 40px; align-items: center; padding-top: 40px; }
.hero-img { margin: 0; }
.hero-img img { box-shadow: 0 20px 50px rgba(0, 0, 0, 0.18); }

.cta { display: flex; gap: 12px; flex-wrap: wrap; margin: 6px 0 16px; }
.button {
  display: inline-block;
  padding: 11px 20px;
  border-radius: 8px;
  border: 1px solid var(--line);
  color: var(--text);
  background: var(--panel);
  text-decoration: none;
  font-weight: 600;
}
.button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.button:hover { filter: brightness(0.97); }

.shots { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; padding-top: 40px; }
.shots figure { margin: 0; }
.shots img { aspect-ratio: 16 / 10; object-fit: cover; border: 1px solid var(--line); }
figcaption { font-size: 14px; color: var(--muted); margin-top: 6px; }

.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.grid article { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 20px 22px; }
.grid ul { margin: 0; padding-left: 20px; }
.grid li { margin: 4px 0; }

.split { display: grid; grid-template-columns: 1.2fr 1fr; gap: 36px; align-items: start; }
.split figure { margin: 0; }
.tree { margin-top: 48px; }

.steps { padding-left: 22px; }
.steps li { margin: 10px 0; }

details { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 10px 16px; margin: 10px 0; }
summary { cursor: pointer; font-weight: 600; }

.help { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 32px; margin-top: 56px; }
.small-print { font-size: 15px; color: var(--muted); }
.small-print h2 { font-size: 20px; color: var(--text); }

footer { border-top: 1px solid var(--line); margin-top: 56px; padding: 22px 16px; text-align: center; font-size: 14px; color: var(--muted); }

@media (max-width: 860px) {
  .hero, .split, .grid { grid-template-columns: 1fr; }
  .shots { grid-template-columns: 1fr 1fr; }
  .tree { margin-top: 0; }
  .help { padding: 22px 18px; }
}
@media (max-width: 520px) {
  .shots { grid-template-columns: 1fr; }
  nav { gap: 12px; font-size: 14px; }
}

/* language menu (a <details> dropdown, no script) */
.lang { position: relative; }
.lang summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
}
.lang summary::-webkit-details-marker { display: none; }
.lang summary svg { width: 16px; height: 16px; fill: currentColor; }
.lang summary:hover, .lang[open] summary { color: var(--text); }
.lang ul {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  margin: 0;
  padding: 6px 0;
  list-style: none;
  min-width: 170px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  z-index: 3;
}
.lang li a { display: block; padding: 6px 14px; color: var(--text); text-decoration: none; }
.lang li a:hover { background: var(--code); }
.lang li a[aria-current] { font-weight: 700; color: var(--accent); }
@media (max-width: 520px) {
  .lang ul { right: auto; left: 0; }
}