/* AnPyer website — base stylesheet, zero build step.
   Dark by default, follows the system preference for light.
   Layout model (all pages): full-width blocks stacked vertically, each with a centred
   .inner limited to --wide. Long-form documents (privacy / terms / support) additionally
   limit their article to --doc for readability. landing.css adds the marketing blocks. */

:root {
  color-scheme: light dark;
  --bg: #0f1115;
  --bg-elev: #161a22;
  --fg: #e6e8ee;
  --fg-muted: #9aa3b2;
  --line: #262c38;
  --accent: #5cc8ff;
  --accent-2: #ffd166;
  --code-bg: #1c212b;
  --wide: 72rem;        /* max content width of every block */
  --doc: 46rem;         /* max width of long-form text */
  --narrow: 40rem;      /* max width of centred copy */
  --block-y: clamp(3.5rem, 9vw, 7rem);
  --radius: 10px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #fafbfd;
    --bg-elev: #ffffff;
    --fg: #1a1f2b;
    --fg-muted: #5b6474;
    --line: #e2e6ee;
    --accent: #0a6fb8;
    --accent-2: #a86b00;
    --code-bg: #f0f2f6;
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--bg);
  color: var(--fg);
  -webkit-text-size-adjust: 100%;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code, pre {
  font-family: ui-monospace, "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
}
code { background: var(--code-bg); padding: 0.1em 0.4em; border-radius: 5px; }

.icon { width: 1em; height: 1em; display: inline-block; vertical-align: -0.15em; flex: none; }

/* ---------- Header (sticky, translucent) ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg-elev) 78%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  backdrop-filter: saturate(160%) blur(14px);
}
.site-header .inner {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.brand {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
  color: var(--fg);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand .logo {
  width: 26px; height: 26px; border-radius: 7px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: inline-block;
}
.nav { display: flex; align-items: center; gap: 1rem; margin-left: auto; flex-wrap: wrap; }
.nav a { color: var(--fg-muted); font-size: 0.95rem; }
.nav a[aria-current="page"] { color: var(--fg); font-weight: 600; }

/* ---------- Language menu (native <details>, JS only closes it on outside click) ---------- */
.lang-menu { position: relative; }
.lang-menu > summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--fg-muted);
  font-size: 0.9rem;
  line-height: 1;
  user-select: none;
}
.lang-menu > summary::-webkit-details-marker { display: none; }
.lang-menu > summary:hover, .lang-menu[open] > summary { color: var(--fg); border-color: var(--fg-muted); }
.lang-menu > summary .icon { width: 1.15em; height: 1.15em; }
.lang-menu > summary .chev { width: 0.9em; height: 0.9em; transition: transform 0.15s ease; }
.lang-menu[open] > summary .chev { transform: rotate(180deg); }
.lang-menu .menu {
  position: absolute;
  right: 0;
  top: calc(100% + 0.5rem);
  min-width: 11rem;
  margin: 0;
  padding: 0.35rem;
  list-style: none;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 18px 40px -18px rgba(0, 0, 0, 0.6);
  z-index: 60;
}
.lang-menu .menu a {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.65rem;
  border-radius: 8px;
  color: var(--fg);
  font-size: 0.95rem;
  white-space: nowrap;
}
.lang-menu .menu a:hover { background: color-mix(in srgb, var(--fg) 7%, transparent); text-decoration: none; }
.lang-menu .menu a[aria-current="true"] { color: var(--fg); font-weight: 600; }
.lang-menu .menu a .tick { margin-left: auto; width: 1em; height: 1em; color: var(--accent); visibility: hidden; }
.lang-menu .menu a[aria-current="true"] .tick { visibility: visible; }
/* Flags are plain emoji (🇬🇧 🇨🇳); Windows Chrome/Edge lack flag glyphs and show "GB"/"CN" letters,
   which is acceptable. Swap for <img> if pixel-identical flags are ever required. */
.flag {
  font-size: 1.15em;
  line-height: 1;
  flex: none;
  font-family: "Twemoji Mozilla", "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", sans-serif;
}

/* ---------- Main: blocks ---------- */
main { flex: 1; width: 100%; }
.block { padding: var(--block-y) 1.25rem; }
.block.alt { background: var(--bg-elev); }
.block > .inner { max-width: var(--wide); margin: 0 auto; }

/* Page hero: title banner shared by all non-landing pages */
.page-hero {
  padding-top: clamp(2.5rem, 6vw, 4.5rem);
  padding-bottom: clamp(2rem, 4vw, 3rem);
  background:
    radial-gradient(60rem 30rem at 50% -10rem, color-mix(in srgb, var(--accent) 18%, transparent), transparent 70%),
    var(--bg);
  border-bottom: 1px solid var(--line);
}
.page-hero .eyebrow { margin-bottom: 0.6rem; }
.page-hero h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 0 0 0.6rem;
}
.page-hero h1 .sub { font-size: 0.5em; font-weight: 400; color: var(--fg-muted); letter-spacing: 0; margin-left: 0.4em; }
.page-hero .meta, .page-hero .lead { margin: 0.4rem 0 0; }
.page-hero .lead { font-size: clamp(1.05rem, 1.5vw, 1.2rem); color: var(--fg-muted); max-width: var(--doc); }

/* Long-form document */
.doc-block { padding-top: clamp(2rem, 4vw, 3rem); }
.doc { max-width: var(--doc); }

/* ---------- Typography ---------- */
.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.9rem;
}
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 0.5rem; }
h2 { font-size: 1.35rem; margin: 2.2rem 0 0.6rem; padding-top: 0.4rem; border-top: 1px solid var(--line); }
h3 { font-size: 1.08rem; margin: 1.5rem 0 0.4rem; }
p, ul, ol { margin: 0.6rem 0; }
li { margin: 0.25rem 0; }
.muted { color: var(--fg-muted); }
.lead { font-size: 1.15rem; color: var(--fg-muted); margin-bottom: 1.5rem; }
.meta { font-size: 0.9rem; color: var(--fg-muted); margin-bottom: 1.5rem; }

.notice {
  border-left: 3px solid var(--accent-2);
  background: var(--bg-elev);
  padding: 0.7rem 1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1rem 0;
  font-size: 0.95rem;
}
.doc-block.alt .notice, .block.alt .notice { background: var(--bg); }

table { border-collapse: collapse; width: 100%; margin: 1rem 0; font-size: 0.95rem; }
th, td { text-align: left; padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--fg-muted); font-weight: 600; }

/* ---------- Buttons ---------- */
.cta { display: flex; gap: 0.8rem; flex-wrap: wrap; margin: 1rem 0 2rem; }
.btn {
  display: inline-block;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--fg);
  font-weight: 600;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: #06121c; }
.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn.large { padding: 0.85rem 1.5rem; font-size: 1.05rem; border-radius: 999px; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  color: var(--fg-muted);
  font-size: 0.88rem;
}
.site-footer .inner {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 1.2rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
  align-items: center;
}
.site-footer .links { display: flex; gap: 1rem; flex-wrap: wrap; margin-left: auto; }
.site-footer a { color: var(--fg-muted); }

/* ---------- Responsive ---------- */
@media (max-width: 40rem) {
  .nav { gap: 0.7rem; }
  .nav a:not(.brand) { font-size: 0.9rem; }
}
@media (max-width: 30rem) {
  .block { padding-left: 1rem; padding-right: 1rem; }
  .site-header .inner { padding-left: 1rem; padding-right: 1rem; }
  .nav .nav-link { display: none; }        /* on phones: brand + language only, footer carries the links */
  h1 { font-size: 1.6rem; }
}