:root {
  color-scheme: light dark;
  --canvas: #f2f2f7;
  --card: #ffffff;
  --text: #1c1c1e;
  --muted: #636366;
  --hairline: rgba(60, 60, 67, 0.16);
  --accent: #3478f6;
  --accent-soft: rgba(52, 120, 246, 0.11);
  --warning: #9a5b00;
  --warning-bg: #fff4d6;
  --radius: 22px;
  --shadow: 0 8px 28px rgba(28, 28, 30, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #000000;
    --card: #1c1c1e;
    --text: #f2f2f7;
    --muted: #aeaeb2;
    --hairline: rgba(235, 235, 245, 0.18);
    --accent: #5e9cff;
    --accent-soft: rgba(94, 156, 255, 0.16);
    --warning: #ffd27a;
    --warning-bg: rgba(154, 91, 0, 0.24);
    --shadow: none;
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 20px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

html[dir="rtl"] body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Arabic", "Geeza Pro",
    "Noto Sans Arabic", sans-serif;
}

a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
  border-radius: 6px;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: 10px;
  inset-inline-start: 10px;
  padding: 9px 14px;
  border-radius: 10px;
  background: var(--card);
  transform: translateY(-180%);
}
.skip-link:focus { transform: translateY(0); }

.page {
  width: min(calc(100% - 28px), 860px);
  margin: 0 auto;
  padding: max(22px, env(safe-area-inset-top)) 0 max(42px, env(safe-area-inset-bottom));
}

.hero, .toc, .section, .footer-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero {
  padding: clamp(26px, 6vw, 52px);
  background:
    radial-gradient(circle at 92% 5%, var(--accent-soft), transparent 36%),
    var(--card);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.3; letter-spacing: -0.02em; }
h1 { margin: 0; font-size: clamp(2rem, 8vw, 3.4rem); }
h2 { margin: 0 0 18px; font-size: clamp(1.3rem, 4.5vw, 1.65rem); }
h3 { margin: 24px 0 8px; font-size: 1.05rem; }
p { margin: 0.7em 0; }

.lead { max-width: 42rem; margin-top: 16px; color: var(--muted); font-size: 1.05rem; }
.meta { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 22px; color: var(--muted); font-size: 0.88rem; }

.notice {
  margin-top: 20px;
  padding: 14px 16px;
  border: 1px solid color-mix(in srgb, var(--warning) 38%, transparent);
  border-radius: 14px;
  background: var(--warning-bg);
  color: var(--warning);
  font-weight: 650;
}

.toc { margin-top: 16px; padding: 18px 22px; }
.toc summary { cursor: pointer; font-weight: 750; }
.toc ol { columns: 2; column-gap: 34px; margin: 14px 0 0; padding-inline-start: 1.4em; }
.toc li { break-inside: avoid; margin: 5px 0; }
.toc a { color: var(--text); text-decoration: none; }
.toc a:hover { color: var(--accent); }

main { display: grid; min-width: 0; gap: 16px; margin-top: 16px; }
.section { min-width: 0; padding: clamp(22px, 5vw, 38px); }
.section > :last-child { margin-bottom: 0; }
ul, ol { padding-inline-start: 1.35em; }
li + li { margin-top: 0.45em; }

.data-table-wrap {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  margin: 18px 0;
  border: 1px solid var(--hairline);
  border-radius: 14px;
  -webkit-overflow-scrolling: touch;
}
table { width: 100%; min-width: 620px; border-collapse: collapse; font-size: 0.94rem; }
th, td { padding: 13px 14px; border-bottom: 1px solid var(--hairline); text-align: start; vertical-align: top; }
th { background: var(--accent-soft); font-weight: 750; }
tr:last-child td { border-bottom: 0; }

.callout { margin: 18px 0; padding: 14px 16px; border-inline-start: 4px solid var(--accent); border-radius: 12px; background: var(--accent-soft); }
.muted { color: var(--muted); }

code, bdi[dir="ltr"] {
  direction: ltr;
  unicode-bidi: isolate;
}

.footer-card { margin-top: 16px; padding: 22px; color: var(--muted); font-size: 0.92rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 8px; }
.footer-card p { margin: 4px 0; }

@media (max-width: 620px) {
  .page { width: min(calc(100% - 20px), 860px); }
  .hero, .section { border-radius: 20px; }
  .toc ol { columns: 1; }
  .meta { display: grid; gap: 3px; }
}

@media print {
  :root { --canvas: #fff; --card: #fff; --text: #000; --muted: #444; }
  body { font-size: 11pt; }
  .page { width: 100%; padding: 0; }
  .hero, .toc, .section, .footer-card { box-shadow: none; border: 1px solid #ddd; break-inside: avoid; }
  .toc { display: none; }
  a { color: inherit; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

.language-switch { display:flex; flex-wrap:wrap; justify-content:center; gap:6px; margin:0 auto 18px; padding:6px; width:fit-content; max-width:100%; border:1px solid var(--hairline); border-radius:16px; background:var(--card); }
.language-switch a { display:block; padding:9px 16px; border-radius:11px; color:var(--muted); text-decoration:none; font:inherit; }
.language-switch a[aria-current="page"] { background:var(--accent-soft); color:var(--accent); font-weight:700; }
.language-switch a:focus-visible { outline:2px solid var(--accent); outline-offset:2px; }
[hidden] { display:none !important; }
@media print { .language-switch { display:none; } }

.hero-toolbar { display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom:20px; }
.hero-toolbar .eyebrow { margin:0; }
.language-menu { position:relative; flex-shrink:0; color:var(--muted); font-size:13px; line-height:1.4; font-weight:500; letter-spacing:normal; text-transform:none; }
.language-menu summary { list-style:none; display:flex; align-items:center; gap:7px; padding:10px 8px; min-height:44px; border-radius:10px; cursor:pointer; }
.language-menu summary::-webkit-details-marker { display:none; }
.language-menu summary:hover, .language-menu[open] summary { background:var(--accent-soft); color:var(--accent); }
.language-menu nav { position:absolute; z-index:20; inset-inline-end:0; top:calc(100% + 6px); width:160px; padding:6px; background:var(--card); border:1px solid var(--hairline); border-radius:14px; box-shadow:0 12px 32px rgba(0,0,0,.13); }
[dir="rtl"] .language-menu nav { right:auto; left:0; }
.language-menu a { display:block; text-align:start; padding:11px 12px; border-radius:8px; text-decoration:none; color:var(--text); font-size:14px; }
.language-menu a[aria-current="page"] { background:var(--accent-soft); color:var(--accent); font-weight:600; }
.language-menu a:hover { background:var(--accent-soft); }
@media(max-width:420px) { .hero-toolbar { gap:4px; } .hero-toolbar .eyebrow { font-size:10px; letter-spacing:.08em; } .language-menu summary { gap:5px; padding-inline:5px; } }
@media print { .language-menu { display:none; } }