/* ==========================================================================
   structmd docs — design system
   Typeface: Roboto / Roboto Mono · Light & dark themes · Gradient accents
   ========================================================================== */

:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --surface-2: #f4f2ec;
  --ink: #191c28;
  --muted: #5d6373;
  --faint: #8b90a0;
  --line: #e7e4da;
  --line-strong: #d8d4c6;

  --violet: #6d5cff;
  --cyan: #00b3e6;
  --pink: #ff4f9a;
  --amber: #ffb02e;
  --green: #17b877;

  --grad: linear-gradient(100deg, var(--violet), var(--cyan) 55%, var(--pink));
  --grad-soft: linear-gradient(100deg, rgba(109, 92, 255, 0.12), rgba(0, 179, 230, 0.12), rgba(255, 79, 154, 0.12));

  --code-bg: #14161f;
  --code-ink: #e8eaf6;
  --code-muted: #7d84a3;
  --code-key: #c792ea;
  --code-str: #a5e07f;
  --code-num: #ffcb6b;
  --code-com: #5b6285;
  --code-fn: #82aaff;

  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(25, 28, 40, 0.05), 0 10px 30px -12px rgba(25, 28, 40, 0.18);
  --shadow-lift: 0 2px 4px rgba(25, 28, 40, 0.06), 0 18px 44px -14px rgba(25, 28, 40, 0.28);
  --nav-h: 64px;
}

[data-theme="dark"] {
  --bg: #0e1017;
  --surface: #161923;
  --surface-2: #1c2030;
  --ink: #edeef6;
  --muted: #a2a8bc;
  --faint: #6d7387;
  --line: #232839;
  --line-strong: #303650;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 34px -14px rgba(0, 0, 0, 0.55);
  --shadow-lift: 0 2px 6px rgba(0, 0, 0, 0.45), 0 20px 48px -16px rgba(0, 0, 0, 0.65);
  --grad-soft: linear-gradient(100deg, rgba(109, 92, 255, 0.16), rgba(0, 179, 230, 0.16), rgba(255, 79, 154, 0.16));
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }

body {
  margin: 0;
  font-family: "Roboto", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  transition: background 0.25s ease, color 0.25s ease;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(109, 92, 255, 0.25); }

h1, h2, h3, h4 { line-height: 1.22; margin: 0 0 0.5em; font-weight: 700; letter-spacing: -0.015em; }
p { margin: 0 0 1em; }
a { color: var(--violet); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
img { max-width: 100%; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand .mark { display: block; }

.nav-links { display: flex; gap: 22px; margin-left: auto; align-items: center; }
.nav-links a {
  color: var(--muted);
  font-weight: 500;
  font-size: 15px;
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-links a.active { color: var(--ink); border-image: var(--grad) 1; border-bottom: 2px solid; }

.nav-cta {
  background: var(--ink);
  color: var(--bg) !important;
  padding: 8px 16px !important;
  border-radius: 999px;
  border-bottom: none !important;
  font-size: 14px !important;
}
.nav-cta:hover { opacity: 0.85; }

.theme-toggle {
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: grid;
  place-items: center;
  color: var(--muted);
}
.theme-toggle:hover { color: var(--ink); border-color: var(--faint); }
.theme-toggle .sun { display: none; }
[data-theme="dark"] .theme-toggle .sun { display: block; }
[data-theme="dark"] .theme-toggle .moon { display: none; }

.menu-btn { display: none; background: none; border: none; color: var(--ink); cursor: pointer; padding: 6px; }

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 72px;
  border-bottom: 1px solid var(--line);
}

.hero::before {
  content: "";
  position: absolute;
  inset: -40% -20% auto;
  height: 130%;
  background:
    radial-gradient(42% 55% at 18% 30%, rgba(109, 92, 255, 0.16), transparent 70%),
    radial-gradient(38% 52% at 82% 22%, rgba(0, 179, 230, 0.14), transparent 70%),
    radial-gradient(30% 44% at 60% 80%, rgba(255, 79, 154, 0.10), transparent 70%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 56px;
  align-items: center;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.kicker .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--grad);
  animation: pulse 2.2s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

.hero h1 {
  font-size: clamp(38px, 5.4vw, 62px);
  font-weight: 900;
  letter-spacing: -0.035em;
  margin-bottom: 20px;
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero .lede { font-size: 19px; color: var(--muted); max-width: 54ch; margin-bottom: 30px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin-bottom: 26px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  font-size: 15.5px;
  padding: 13px 26px;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow-lift); }
.btn-primary { background: var(--ink); color: var(--bg); }
.btn-ghost { background: var(--surface); color: var(--ink); border-color: var(--line-strong); }

.install-snippet {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--code-bg);
  color: var(--code-ink);
  font-family: "Roboto Mono", monospace;
  font-size: 14px;
  padding: 11px 16px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.07);
}
.install-snippet .prompt { color: var(--code-str); user-select: none; }
.copy-btn {
  background: none;
  border: none;
  color: var(--code-muted);
  cursor: pointer;
  display: grid;
  place-items: center;
  padding: 2px;
}
.copy-btn:hover { color: var(--code-ink); }

.meta-badges { display: flex; flex-wrap: wrap; gap: 8px; }
.badge-chip {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--muted);
  border: 1px solid var(--line-strong);
  background: var(--surface);
  padding: 4px 12px;
  border-radius: 999px;
}

/* Terminal window */
.window {
  background: var(--code-bg);
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow-lift);
  overflow: hidden;
  font-family: "Roboto Mono", monospace;
  font-size: 13.5px;
  line-height: 1.75;
}
.window-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}
.window-bar i { width: 11px; height: 11px; border-radius: 50%; display: block; }
.window-bar i:nth-child(1) { background: #ff5f57; }
.window-bar i:nth-child(2) { background: #febc2e; }
.window-bar i:nth-child(3) { background: #28c840; }
.window-bar span { margin-left: 10px; color: var(--code-muted); font-size: 12px; }
.window-body { padding: 18px 20px; color: var(--code-ink); white-space: pre-wrap; overflow-x: auto; }
.window-body .c-prompt { color: var(--code-str); }
.window-body .c-dim { color: var(--code-muted); }
.window-body .c-hl { color: var(--code-num); }
.window-body .c-ok { color: #58e6a8; }

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */

section.block { padding: 76px 0; border-bottom: 1px solid var(--line); }
section.block:last-of-type { border-bottom: none; }

.sec-head { max-width: 720px; margin-bottom: 44px; }
.sec-head h2 { font-size: clamp(27px, 3.4vw, 38px); letter-spacing: -0.025em; }
.sec-head p { color: var(--muted); font-size: 17.5px; margin: 0; }
.sec-tag {
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: block;
  margin-bottom: 10px;
}

/* Architecture pipeline */
.pipeline {
  display: grid;
  grid-template-columns: 1fr 46px 1fr 46px 1fr;
  align-items: stretch;
  gap: 0;
  margin-top: 8px;
}
.stage-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  box-shadow: var(--shadow);
  position: relative;
}
.stage-card .stage-no {
  font-family: "Roboto Mono", monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 12px;
  display: block;
}
.stage-card h3 { font-size: 19px; margin-bottom: 8px; }
.stage-card p { color: var(--muted); font-size: 14.5px; margin: 0; }
.stage-card .chip-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.chip {
  font-family: "Roboto Mono", monospace;
  font-size: 11.5px;
  padding: 3px 9px;
  border-radius: 6px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--muted);
}
.flow-arrow { display: grid; place-items: center; color: var(--faint); }
.flow-arrow svg { width: 26px; height: 26px; }

.json-card { border-top: 3px solid var(--violet); }
.vlm-card { border-top: 3px solid var(--cyan); }
.md-card { border-top: 3px solid var(--pink); }

/* Feature grid */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.feature:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); }
.feature .icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  background: var(--grad-soft);
  color: var(--violet);
}
.feature:nth-child(3n+2) .icon { color: var(--cyan); }
.feature:nth-child(3n) .icon { color: var(--pink); }
.feature h3 { font-size: 17.5px; margin-bottom: 7px; }
.feature p { color: var(--muted); font-size: 14.5px; margin: 0; }

/* Code blocks with tabs */
.tabs { display: flex; gap: 6px; margin-bottom: -1px; }
.tab {
  font-family: "Roboto Mono", monospace;
  font-size: 13px;
  font-weight: 500;
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-bottom: none;
  border-radius: 10px 10px 0 0;
  background: var(--surface-2);
  color: var(--muted);
  cursor: pointer;
}
.tab.active {
  background: var(--code-bg);
  color: var(--code-ink);
  border-color: transparent;
}
.codebox {
  background: var(--code-bg);
  border-radius: 0 14px 14px 14px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  overflow: hidden;
}
.codebox .window-body { position: relative; }
.codebox pre {
  margin: 0;
  font-family: "Roboto Mono", monospace;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--code-ink);
  overflow-x: auto;
  padding: 18px 20px;
}
.codebox .copy-btn { position: absolute; top: 12px; right: 12px; }
.panel { display: none; }
.panel.active { display: block; }

.k { color: var(--code-key); }   /* keyword */
.s { color: var(--code-str); }   /* string */
.n { color: var(--code-num); }   /* number */
.c { color: var(--code-com); }   /* comment */
.f { color: var(--code-fn); }    /* function */
.p { color: var(--code-ink); }   /* plain */
.d { color: var(--code-muted); } /* dim */

/* Terminal-style tokens (usable inside any <pre>) */
.c-prompt { color: var(--code-str); }
.c-dim { color: var(--code-muted); }
.c-hl { color: var(--code-num); }
.c-ok { color: #58e6a8; }

/* Tables */
.tablewrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
table.tbl { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 640px; }
table.tbl th {
  text-align: left;
  font-size: 12.5px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-2);
}
table.tbl td { padding: 13px 18px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.tbl tr:last-child td { border-bottom: none; }
table.tbl td:first-child { font-weight: 600; white-space: nowrap; }
.yes { color: var(--green); font-weight: 700; }
.no { color: var(--faint); }

/* Callout */
.callout {
  display: flex;
  gap: 14px;
  background: var(--grad-soft);
  border: 1px solid color-mix(in srgb, var(--violet) 22%, var(--line));
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 22px 0;
}
.callout svg { flex-shrink: 0; width: 22px; height: 22px; color: var(--violet); margin-top: 2px; }
.callout p { margin: 0; font-size: 14.5px; color: var(--ink); }
.callout .callout-title { font-weight: 700; display: block; margin-bottom: 2px; }

/* --------------------------------------------------------------------------
   Docs page layout
   -------------------------------------------------------------------------- */

.docs-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 56px;
  padding: 48px 0 90px;
}

.sidebar { position: sticky; top: calc(var(--nav-h) + 24px); align-self: start; max-height: calc(100vh - var(--nav-h) - 48px); overflow-y: auto; }
.sidebar .side-group { margin-bottom: 26px; }
.sidebar .side-title {
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 10px;
}
.sidebar a.side-link {
  display: block;
  color: var(--muted);
  font-size: 14.5px;
  padding: 6px 12px;
  border-left: 2px solid var(--line);
  border-radius: 0 8px 8px 0;
}
.sidebar a.side-link:hover { color: var(--ink); text-decoration: none; background: var(--surface-2); }
.sidebar a.side-link.active { color: var(--violet); border-left-color: var(--violet); background: var(--grad-soft); font-weight: 600; }

.doc-content h2 {
  font-size: 27px;
  margin-top: 54px;
  padding-top: 10px;
}
.doc-content h2:first-child { margin-top: 0; }
.doc-content h3 { font-size: 19px; margin-top: 32px; }
.doc-content p, .doc-content li { color: var(--muted); font-size: 15.5px; }
.doc-content strong { color: var(--ink); }
.doc-content ul, .doc-content ol { padding-left: 22px; margin: 0 0 1em; }
.doc-content li { margin-bottom: 6px; }

.inline-code, :not(pre) > code {
  font-family: "Roboto Mono", monospace;
  font-size: 0.86em;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2px 7px;
  color: var(--ink);
  white-space: nowrap;
}

.doc-content .codebox { margin: 18px 0 26px; }
.doc-content table.tbl { margin: 18px 0 26px; min-width: 0; }

.anchor-link { opacity: 0; margin-left: 8px; font-size: 0.75em; text-decoration: none; }
h2:hover .anchor-link, h3:hover .anchor-link { opacity: 1; }

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

footer.site {
  border-top: 1px solid var(--line);
  padding: 44px 0 56px;
  color: var(--muted);
  font-size: 14.5px;
}
.foot-grid { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.foot-col h4 { font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); margin-bottom: 14px; }
.foot-col a { display: block; color: var(--muted); margin-bottom: 9px; }
.foot-col a:hover { color: var(--ink); text-decoration: none; }
.foot-note { margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; color: var(--faint); font-size: 13.5px; }

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .features { grid-template-columns: repeat(2, 1fr); }
  .docs-layout { grid-template-columns: 1fr; gap: 30px; }
  .sidebar { position: static; max-height: none; display: flex; gap: 26px; overflow-x: auto; padding-bottom: 8px; }
  .sidebar .side-group { margin: 0; flex-shrink: 0; }
  .pipeline { grid-template-columns: 1fr; gap: 14px; }
  .flow-arrow { transform: rotate(90deg); padding: 2px 0; }
}

@media (max-width: 640px) {
  .features { grid-template-columns: 1fr; }
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 18px 24px;
    gap: 4px;
  }
  .nav-links.open { display: flex; }
  .menu-btn { display: block; margin-left: auto; }
  .nav-cta { display: inline-block; text-align: center; }
  .hero { padding: 56px 0 52px; }
}