@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Sora:wght@400;600;700&family=JetBrains+Mono:wght@400;500&display=swap');
@import './tokens.css';

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-primary);
  background: var(--color-bg);
  color: var(--color-heading);
  font-size: var(--fs-14);
  line-height: var(--lh-24);
  transition: background 0.2s, color 0.2s;
}

/* Applied by ds.js for one frame around a theme toggle so the colour
   swap is synchronous across every element (no per-element 200ms
   cascade flicker on the sidebar / nav links / demo boxes). */
html.ds-no-transitions,
html.ds-no-transitions *,
html.ds-no-transitions *::before,
html.ds-no-transitions *::after {
  transition: none !important;
}

/* ── LAYOUT ──
   Global header sits above the three-column body. Sidebar and TOC are
   fixed but start below the header; main is in normal flow with margin
   to clear the side rails and top padding to clear the header.       */
.ds-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--ds-header-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  gap: 16px;
  z-index: 40;
  transition: background 0.2s, border-color 0.2s;
}

.sidebar {
  position: fixed;
  top: var(--ds-header-height); left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--ds-header-height));
  overflow-y: auto;
  background: var(--color-bg);
  border-right: 1px solid var(--color-border);
  z-index: 30;
  display: flex;
  flex-direction: column;
  transition: background 0.2s;
}

.main {
  margin-left: var(--sidebar-width);
  margin-right: var(--toc-width);
  padding: calc(var(--ds-header-height) + 28px) 52px 120px;
  min-height: 100vh;
}

.toc {
  position: fixed;
  top: var(--ds-header-height); right: 0;
  width: var(--toc-width);
  height: calc(100vh - var(--ds-header-height));
  overflow-y: auto;
  background: var(--color-bg);
  border-left: 1px solid var(--color-border);
  padding: 24px 18px;
  z-index: 30;
  transition: background 0.2s;
}

/* ── SIDEBAR ── */
.sb-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.sb-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: var(--fw-bold);
  font-size: var(--fs-14);
  color: var(--color-heading);
  text-decoration: none;
}

.sb-tag {
  background: var(--color-heading);
  color: var(--color-bg);
  font-size: 10px;
  font-weight: var(--fw-semibold);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
}

.theme-btn {
  background: var(--color-bg-2);
  border: 1px solid var(--color-border);
  color: var(--color-heading);
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
  flex-shrink: 0;
}
.theme-btn:hover { background: var(--color-bg-trans); }

.sb-section {
  padding: 14px 16px 4px;
  font-size: 10.5px;
  font-weight: var(--fw-bold);
  color: var(--color-subheading);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  flex-shrink: 0;
}

.sb-link {
  display: block;
  padding: 5px 16px 5px 14px;
  font-size: var(--fs-14);
  color: var(--color-subheading);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all 0.12s;
}
.sb-link:hover { color: var(--color-heading); background: var(--color-bg-trans); }
.sb-link.active {
  color: var(--color-heading);
  border-left-color: var(--color-heading);
  background: var(--color-bg-trans);
  font-weight: var(--fw-medium);
}

.sb-link-stub {
  display: block;
  padding: 5px 16px 5px 14px;
  font-size: var(--fs-14);
  color: var(--color-subheading);
  text-decoration: none;
  border-left: 2px solid transparent;
  opacity: 0.45;
  cursor: default;
  pointer-events: none;
  user-select: none;
}

/* ── TOC ── */
.toc-title {
  font-size: 10.5px;
  font-weight: var(--fw-bold);
  color: var(--color-subheading);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}

.toc-link {
  display: block;
  font-size: var(--fs-12);
  color: var(--color-subheading);
  text-decoration: none;
  padding: 3px 0 3px 10px;
  border-left: 2px solid transparent;
  transition: all 0.12s;
}
.toc-link:hover { color: var(--color-heading); }
.toc-link.active { color: var(--color-heading); border-left-color: var(--color-heading); font-weight: var(--fw-medium); }

/* ── PAGE TYPOGRAPHY ── */
.page-title { font-size: var(--fs-32); font-weight: var(--fw-bold); margin-bottom: 8px; line-height: var(--lh-40); }
.page-intro  { font-size: var(--fs-14); color: var(--color-subheading); margin-bottom: var(--spacing-2xl); line-height: var(--lh-24); max-width: 600px; }

h2 { font-size: var(--fs-20); font-weight: var(--fw-semibold); margin: 44px 0 10px; scroll-margin-top: 24px; color: var(--color-heading); }
h3 { font-size: var(--fs-16); font-weight: var(--fw-semibold); margin: 24px 0 10px; color: var(--color-heading); }

.desc { font-size: var(--fs-14); color: var(--color-subheading); margin-bottom: var(--spacing-md); line-height: var(--lh-24); }

.callout {
  background: var(--color-bg-2);
  border-left: 3px solid var(--color-heading);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 10px 14px;
  font-size: var(--fs-12);
  color: var(--color-subheading);
  margin-bottom: 18px;
  line-height: var(--lh-20);
}
.callout strong { color: var(--color-heading); }

code {
  font-family: var(--font-mono);
  background: var(--color-bg-2);
  border: 1px solid var(--color-border);
  padding: 1px 5px;
  border-radius: var(--radius-xs);
  font-size: 0.875em;
  color: var(--color-info-text);
}

/* ── COMING SOON ── */
.coming-soon {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 240px;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-subheading);
  font-size: var(--fs-14);
  gap: 8px;
  text-align: center;
}

.coming-soon .cs-icon { font-size: 32px; opacity: 0.3; }
.coming-soon p { color: var(--color-subheading); }
.coming-soon small { font-size: var(--fs-12); opacity: 0.7; }