:root {
  --bg0: #0f1c24;
  --bg1: #163040;
  --ink: #e8f1f4;
  --muted: #9bb4bf;
  --accent: #3db8a0;
  --accent-ink: #06241e;
  --line: rgba(232, 241, 244, 0.14);
  --panel: rgba(12, 28, 36, 0.72);
  --scroll-track: rgba(8, 18, 24, 0.85);
  --scroll-thumb: rgba(61, 184, 160, 0.55);
  --scroll-thumb-hover: rgba(61, 184, 160, 0.85);
  --font-en: "Source Sans 3", "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-fa: "Vazirmatn", "IRANSans", Tahoma, "Segoe UI", sans-serif;
  --font-display: "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", "Fira Code", Consolas, monospace;
}

* { box-sizing: border-box; }

html {
  scrollbar-gutter: stable;
  scrollbar-width: auto;
  scrollbar-color: var(--scroll-thumb) var(--scroll-track);
}

html::-webkit-scrollbar,
body::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

html::-webkit-scrollbar-track,
body::-webkit-scrollbar-track {
  background: var(--scroll-track);
}

html::-webkit-scrollbar-thumb,
body::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb);
  border-radius: 8px;
  min-height: 40px;
}

html::-webkit-scrollbar-thumb:hover,
body::-webkit-scrollbar-thumb:hover {
  background: var(--scroll-thumb-hover);
}

html::-webkit-scrollbar-corner,
body::-webkit-scrollbar-corner {
  background: transparent;
}

/* Nested scroll areas (tables, code) share the same look */
.scroll-x,
.doc-view pre,
.doc-table-wrap {
  scrollbar-width: thin;
  scrollbar-color: var(--scroll-thumb) var(--scroll-track);
}

.scroll-x::-webkit-scrollbar,
.doc-view pre::-webkit-scrollbar,
.doc-table-wrap::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

.scroll-x::-webkit-scrollbar-track,
.doc-view pre::-webkit-scrollbar-track,
.doc-table-wrap::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.35);
  border-radius: 8px;
}

.scroll-x::-webkit-scrollbar-thumb,
.doc-view pre::-webkit-scrollbar-thumb,
.doc-table-wrap::-webkit-scrollbar-thumb {
  background: rgba(61, 184, 160, 0.6);
  border-radius: 8px;
}

.scroll-x::-webkit-scrollbar-thumb:hover,
.doc-view pre::-webkit-scrollbar-thumb:hover,
.doc-table-wrap::-webkit-scrollbar-thumb:hover {
  background: rgba(61, 184, 160, 0.85);
}

html, body {
  margin: 0;
  min-height: 100%;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(61, 184, 160, 0.22), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(72, 132, 180, 0.2), transparent 50%),
    linear-gradient(160deg, var(--bg0), var(--bg1));
  font-family: var(--font-en);
  background-attachment: fixed;
}

body[data-lang="fa"] {
  font-family: var(--font-fa);
}

body[data-lang="fa"] .brand-block h1,
body[data-lang="fa"] h2 {
  font-family: var(--font-fa);
}

.shell {
  width: min(920px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 3rem;
}

.top {
  display: flex;
  gap: 1.5rem;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.eyebrow {
  margin: 0 0 0.4rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 700;
}

.brand-block h1 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.15;
}

.lede {
  margin: 0;
  max-width: 38rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.lang-mode {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.35rem;
  flex-shrink: 0;
}

body[data-lang="fa"] .lang-mode {
  align-items: flex-start;
}

.lang-label {
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
}

.lang-switch {
  display: inline-flex;
  gap: 0.35rem;
  padding: 0.3rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.25);
  flex-shrink: 0;
}

.lang-switch button {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  cursor: pointer;
}

.lang-switch button[aria-pressed="true"] {
  background: var(--accent);
  color: var(--accent-ink);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1.25rem 1.4rem 1.4rem;
  margin-bottom: 1rem;
  backdrop-filter: blur(8px);
}

.panel.muted { opacity: 0.95; }

.panel h2 {
  margin: 0 0 0.9rem;
  font-size: 1.05rem;
  font-family: var(--font-display);
}

.doc-list {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.65rem;
}

body[data-lang="fa"] .doc-list {
  padding-left: 0;
  padding-right: 1.2rem;
}

.doc-list a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.doc-list a:hover {
  color: var(--accent);
  border-bottom-color: rgba(61, 184, 160, 0.5);
}

.doc-list .hint {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
  margin-top: 0.15rem;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.2rem;
  margin: 0.8rem 0 0;
}

.links a,
footer a {
  color: var(--accent);
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
}

footer {
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.credit {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.credit strong {
  color: var(--ink);
  font-weight: 700;
}

.credit a,
footer a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.credit a:hover,
footer a:hover {
  text-decoration: underline;
}

@media (max-width: 700px) {
  .top { flex-direction: column; }
}