/* =========================================================================
   Phlox product site — styles.css
   Brand: Phlox Dark — deep purple-black (#160821) + phlox magenta (#df00ff)
   ========================================================================= */

:root {
  /* Brand palette (from the Phlox Dark theme tokens) */
  --bg: #160821;
  --surface: #20102e;
  --surface-2: #2a1740;
  --surface-3: #341d4f;
  --border: #3d2659;
  --text: #f0e6f7;
  --text-muted: #b69fc9;
  --accent: #df00ff;
  --accent-2: #ff55ff;
  --accent-deep: #9b00cc;
  --accent-fg: #ffffff;
  --header: #110619;

  --ok: #38e0a8;
  --maxw: 1160px;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 0 1px rgba(223, 0, 255, 0.18), 0 18px 50px -18px rgba(223, 0, 255, 0.35);

  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
code { font-family: var(--mono); font-size: 0.86em; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- Decorative background ---------- */
.bg-aurora {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    radial-gradient(60% 50% at 78% -5%, rgba(223, 0, 255, 0.20), transparent 60%),
    radial-gradient(50% 45% at 8% 8%, rgba(155, 0, 204, 0.18), transparent 60%),
    radial-gradient(60% 60% at 50% 120%, rgba(122, 31, 162, 0.16), transparent 60%);
}
.bg-grid {
  position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: 0.5;
  background-image:
    linear-gradient(rgba(223, 0, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(223, 0, 255, 0.045) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(80% 60% at 50% 0%, #000 30%, transparent 90%);
  -webkit-mask-image: radial-gradient(80% 60% at 50% 0%, #000 30%, transparent 90%);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font-weight: 600; font-size: 0.95rem;
  padding: 12px 20px; border-radius: 999px;
  border: 1px solid transparent; cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  color: var(--accent-fg);
  box-shadow: 0 10px 30px -8px rgba(223, 0, 255, 0.55);
}
.btn-primary:hover { box-shadow: 0 14px 38px -8px rgba(223, 0, 255, 0.7); transform: translateY(-2px); }
.btn-secondary {
  background: var(--surface-2); color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: #fff; }
.btn-ghost {
  background: transparent; color: var(--text); border-color: var(--border);
  padding: 9px 16px; font-size: 0.9rem;
}
.btn-ghost:hover { border-color: var(--accent); background: rgba(223, 0, 255, 0.08); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(17, 6, 25, 0.72);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid rgba(61, 38, 89, 0.6);
}
.header-inner { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -0.01em; }
.brand-mark { filter: drop-shadow(0 0 10px rgba(223, 0, 255, 0.45)); }
.brand-name { font-size: 1.18rem; }
.nav { display: flex; gap: 26px; margin-left: 8px; flex: 1; }
.nav a { color: var(--text-muted); font-size: 0.93rem; font-weight: 500; transition: color 0.15s; }
.nav a:hover { color: var(--text); }
.header-actions { display: flex; align-items: center; gap: 12px; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.25s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { padding: 84px 0 56px; }
.hero-inner { display: grid; grid-template-columns: 1.05fr 1fr; gap: 52px; align-items: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 0.82rem; font-weight: 600; letter-spacing: 0.02em;
  color: var(--text-muted);
  background: var(--surface); border: 1px solid var(--border);
  padding: 7px 14px; border-radius: 999px; margin-bottom: 22px;
}
.eyebrow .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px var(--accent); }
.hero-title { font-size: clamp(2.4rem, 5.2vw, 3.7rem); line-height: 1.05; font-weight: 800; letter-spacing: -0.02em; margin: 0 0 20px; }
.grad-text {
  background: linear-gradient(110deg, var(--accent-2), var(--accent) 45%, #c46bff);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { font-size: 1.1rem; color: var(--text-muted); max-width: 560px; margin: 0 0 30px; }
.hero-sub strong { color: var(--text); }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-cta.center { justify-content: center; }

.hero-providers { margin-top: 34px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.hero-providers-label { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); }
.provider-list { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; }
.provider-list li {
  font-size: 0.82rem; font-weight: 500; color: var(--text);
  background: var(--surface); border: 1px solid var(--border);
  padding: 5px 12px; border-radius: 8px;
}

/* Browser frame */
.hero-visual { perspective: 1600px; }
.browser-frame {
  border-radius: 14px; overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow), var(--shadow-glow);
  transform: rotateY(-7deg) rotateX(3deg);
  transition: transform 0.5s ease;
}
.hero-visual:hover .browser-frame { transform: rotateY(0deg) rotateX(0deg); }
.browser-bar { display: flex; align-items: center; gap: 7px; padding: 11px 14px; background: var(--header); border-bottom: 1px solid var(--border); }
.traffic { width: 11px; height: 11px; border-radius: 50%; background: var(--surface-3); }
.traffic:nth-child(1) { background: #ff5f57; }
.traffic:nth-child(2) { background: #febc2e; }
.traffic:nth-child(3) { background: #28c840; }
.browser-url { margin-left: 12px; font-family: var(--mono); font-size: 0.74rem; color: var(--text-muted); background: var(--bg); padding: 3px 12px; border-radius: 6px; }
.browser-frame img { width: 100%; display: block; }

/* ---------- Strip ---------- */
.strip { padding: 10px 0 44px; }
.strip-inner {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
  background: linear-gradient(180deg, var(--surface), var(--surface) 100%);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px;
}
.strip-item { display: flex; flex-direction: column; gap: 4px; text-align: center; }
.strip-num { font-size: 1.9rem; font-weight: 800; color: #fff; letter-spacing: -0.02em; }
.strip-label { font-size: 0.85rem; color: var(--text-muted); }

/* ---------- Section scaffolding ---------- */
.section { padding: 84px 0; }
.section-alt { background: linear-gradient(180deg, rgba(32, 16, 46, 0.4), rgba(22, 8, 33, 0)); }
.section-head { max-width: 720px; margin: 0 auto 52px; text-align: center; }
.kicker {
  display: inline-block; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent-2); margin-bottom: 14px;
}
.section-title { font-size: clamp(1.7rem, 3.4vw, 2.4rem); font-weight: 800; letter-spacing: -0.02em; margin: 0 0 14px; line-height: 1.15; }
.section-lead { font-size: 1.06rem; color: var(--text-muted); margin: 0; }
.section-lead.center { margin: 0 auto; }
.section-lead strong { color: var(--text); }

/* ---------- Provider band ---------- */
.band { padding: 30px 0 70px; }
.band-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.check-list { list-style: none; margin: 22px 0 0; padding: 0; display: grid; gap: 12px; }
.check-list li { position: relative; padding-left: 30px; color: var(--text-muted); }
.check-list li::before {
  content: ""; position: absolute; left: 0; top: 7px; width: 18px; height: 18px; border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, var(--accent-2), var(--accent));
  box-shadow: 0 0 12px rgba(223, 0, 255, 0.4);
}
.check-list li::after { content: "✓"; position: absolute; left: 4px; top: 6px; font-size: 11px; font-weight: 800; color: #fff; }
.check-list code, .section-lead code, .hero-sub code, .qs-note code, .arch-note code, .feature-card code, .info-card code, .split-item code, .doc-card code, .stack-row code {
  background: var(--surface-3); color: #f4d9ff; padding: 1px 6px; border-radius: 5px; border: 1px solid var(--border);
}

/* ---------- Code cards ---------- */
.code-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.code-head { display: flex; align-items: center; justify-content: space-between; padding: 11px 16px; background: var(--header); border-bottom: 1px solid var(--border); }
.code-file { font-family: var(--mono); font-size: 0.78rem; color: var(--text-muted); }
.copy-btn {
  font-family: var(--font); font-size: 0.74rem; font-weight: 600; color: var(--text-muted);
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 7px; padding: 5px 11px; cursor: pointer;
  transition: 0.15s;
}
.copy-btn:hover { color: #fff; border-color: var(--accent); }
.copy-btn.copied { color: var(--ok); border-color: var(--ok); }
.code-block { margin: 0; padding: 18px 18px; overflow-x: auto; font-family: var(--mono); font-size: 0.84rem; line-height: 1.65; color: #e9d9f5; }
.code-block code { font-size: inherit; }
.c-key { color: #ff7bf2; }
.c-str { color: #b9f5c0; }
.c-cmt { color: #8a74a3; font-style: italic; }
.c-bool { color: #ffc98a; }

/* ---------- Feature grid ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 24px; transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  position: relative; overflow: hidden;
}
.feature-card::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1px;
  background: linear-gradient(140deg, rgba(223, 0, 255, 0.35), transparent 45%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; opacity: 0; transition: opacity 0.2s;
}
.feature-card:hover { transform: translateY(-4px); border-color: rgba(223, 0, 255, 0.4); box-shadow: var(--shadow); }
.feature-card:hover::before { opacity: 1; }
.feature-ic {
  width: 46px; height: 46px; display: grid; place-items: center; font-size: 1.35rem;
  background: linear-gradient(140deg, var(--surface-3), var(--surface-2));
  border: 1px solid var(--border); border-radius: 12px; margin-bottom: 16px;
}
.feature-card h3 { font-size: 1.08rem; margin: 0 0 8px; font-weight: 700; }
.feature-card p { margin: 0; color: var(--text-muted); font-size: 0.93rem; }

/* ---------- Split (agent + knowledge) ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.split.reverse .split-copy { order: 2; }
.split-list { display: grid; gap: 14px; }
.split-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 18px 20px; }
.split-item h3 { margin: 0 0 6px; font-size: 1.02rem; display: flex; align-items: baseline; gap: 12px; }
.split-item .num { font-family: var(--mono); font-size: 0.8rem; color: var(--accent-2); font-weight: 700; }
.split-item p { margin: 0; color: var(--text-muted); font-size: 0.92rem; }
.split-copy .kicker { margin-bottom: 12px; }

/* Agent loop diagram */
.diagram-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.loop { display: flex; flex-direction: column; align-items: center; gap: 10px; text-align: center; }
.loop-node {
  width: 100%; background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px;
  padding: 13px 16px; font-weight: 600; font-size: 0.92rem;
}
.loop-node small { display: block; font-weight: 400; font-size: 0.76rem; color: var(--text-muted); font-family: var(--mono); margin-top: 4px; }
.loop-node.accent { border-color: var(--accent); box-shadow: 0 0 0 1px rgba(223, 0, 255, 0.25), 0 10px 30px -14px rgba(223, 0, 255, 0.6); background: linear-gradient(160deg, var(--surface-3), var(--surface-2)); }
.loop-node.ok { border-color: rgba(56, 224, 168, 0.5); color: #d6fff0; }
.loop-arrow { color: var(--accent-2); font-size: 1.1rem; line-height: 1; }
.loop-row { display: flex; flex-wrap: wrap; gap: 7px; justify-content: center; }
.loop-pill { font-family: var(--mono); font-size: 0.72rem; background: var(--bg); border: 1px solid var(--border); color: var(--text-muted); padding: 5px 10px; border-radius: 7px; }
.badge { font-family: var(--mono); font-size: 0.68rem; color: var(--accent-2); border: 1px solid var(--border); border-radius: 6px; padding: 2px 7px; margin-left: 6px; }

/* Knowledge stack card */
.stack-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 26px; box-shadow: var(--shadow); }
.stack-row { display: flex; align-items: center; gap: 16px; }
.stack-step {
  flex: none; width: 34px; height: 34px; display: grid; place-items: center; border-radius: 9px;
  background: linear-gradient(140deg, var(--accent), var(--accent-deep)); color: #fff; font-weight: 700; font-size: 0.9rem;
  box-shadow: 0 6px 18px -8px rgba(223, 0, 255, 0.7);
}
.stack-row strong { display: block; font-size: 0.98rem; }
.stack-row small { color: var(--text-muted); font-size: 0.82rem; }
.stack-line { width: 2px; height: 18px; background: var(--border); margin-left: 16px; }

/* ---------- 3-up info cards ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.info-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; transition: border-color 0.2s, transform 0.2s; }
.info-card:hover { border-color: rgba(223, 0, 255, 0.4); transform: translateY(-3px); }
.info-card h3 { margin: 0 0 8px; font-size: 1.04rem; }
.info-card p { margin: 0; color: var(--text-muted); font-size: 0.92rem; }

/* ---------- Screenshot showcase ---------- */
.shot {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.shot:hover { transform: translateY(-4px); border-color: rgba(223, 0, 255, 0.4); }
.shot img { width: 100%; display: block; border-bottom: 1px solid var(--border); background: var(--bg); }
.shot figcaption {
  padding: 14px 18px; font-size: 0.88rem; color: var(--text-muted); text-align: center;
}
.shot figcaption code {
  background: var(--surface-3); color: #f4d9ff; padding: 1px 6px; border-radius: 5px; border: 1px solid var(--border);
}

.shot-feature {
  max-width: 940px; margin: 0 auto 22px;
  border-color: rgba(223, 0, 255, 0.4); box-shadow: var(--shadow-glow);
}
.shot-feature:hover { transform: none; }

.shot-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 40px; }
.shot-row.two { grid-template-columns: repeat(2, 1fr); max-width: 940px; margin-left: auto; margin-right: auto; margin-top: 0; }

/* ---------- Architecture ---------- */
.arch { display: grid; grid-template-columns: 1fr auto 1fr; gap: 0; align-items: stretch; max-width: 940px; margin: 0 auto; }
.arch-col { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 28px; }
.arch-col.accent { border-color: rgba(223, 0, 255, 0.4); box-shadow: var(--shadow-glow); }
.arch-head { font-weight: 700; font-size: 1.1rem; margin-bottom: 16px; display: flex; flex-direction: column; gap: 2px; }
.arch-head span { font-weight: 500; font-size: 0.8rem; color: var(--accent-2); font-family: var(--mono); }
.arch-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.arch-col li { position: relative; padding-left: 18px; color: var(--text-muted); font-size: 0.92rem; }
.arch-col li::before { content: ""; position: absolute; left: 0; top: 9px; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.arch-flow { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 0 18px; gap: 8px; }
.arch-flow-label { font-family: var(--mono); font-size: 0.72rem; color: var(--text-muted); white-space: nowrap; transform: rotate(0deg); }
.arch-flow-line { width: 60px; height: 2px; background: linear-gradient(90deg, var(--border), var(--accent), var(--border)); }
.arch-note { text-align: center; color: var(--text-muted); margin: 28px auto 0; max-width: 660px; font-size: 0.95rem; }

/* ---------- Themes ---------- */
.theme-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.theme-chip { display: flex; align-items: center; gap: 8px; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; transition: border-color 0.2s; }
.theme-chip:hover { border-color: var(--accent); }
.theme-chip .sw { width: 18px; height: 18px; border-radius: 5px; border: 1px solid rgba(255, 255, 255, 0.16); }
.theme-chip b { font-size: 0.88rem; font-weight: 600; margin-left: 4px; }

/* ---------- Quick start ---------- */
.qs-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.qs-note { text-align: center; color: var(--text-muted); margin: 26px auto 0; max-width: 680px; font-size: 0.95rem; }
.qs-note strong { color: var(--accent-2); }

/* ---------- Docs ---------- */
.doc-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.doc-card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 20px; transition: transform 0.2s, border-color 0.2s; }
.doc-card:hover { transform: translateY(-3px); border-color: var(--accent); }
.doc-card h3 { margin: 0 0 6px; font-size: 1rem; display: flex; align-items: center; gap: 6px; }
.doc-card h3::after { content: "↗"; font-size: 0.8rem; color: var(--text-muted); }
.doc-card p { margin: 0; color: var(--text-muted); font-size: 0.86rem; }

/* ---------- Final CTA ---------- */
.cta-final { padding: 90px 0; }
.cta-inner {
  text-align: center; max-width: 720px; margin: 0 auto;
  background: linear-gradient(160deg, var(--surface-2), var(--surface));
  border: 1px solid rgba(223, 0, 255, 0.3); border-radius: 24px;
  padding: 54px 40px; box-shadow: var(--shadow-glow);
}
.cta-logo { margin: 0 auto 18px; filter: drop-shadow(0 0 16px rgba(223, 0, 255, 0.5)); }
.cta-inner h2 { font-size: clamp(1.6rem, 3.4vw, 2.2rem); margin: 0 0 10px; font-weight: 800; letter-spacing: -0.02em; }
.cta-inner p { color: var(--text-muted); margin: 0 0 26px; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--header); padding: 52px 0 28px; }
.footer-inner { display: grid; grid-template-columns: 1.4fr 2fr; gap: 40px; }
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; max-width: 280px; margin: 14px 0 0; }
.footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.footer-col h4 { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin: 0 0 14px; }
.footer-col a { display: block; color: var(--text); font-size: 0.9rem; margin-bottom: 10px; transition: color 0.15s; }
.footer-col a:hover { color: var(--accent-2); }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--border); color: var(--text-muted); font-size: 0.8rem; }

/* ---------- Reveal animation ----------
   Content is visible by default. Only when JS is active (html.js) do we hide
   it for the scroll-in effect, so the page is fully readable without JS. */
.reveal { transition: opacity 0.6s ease, transform 0.6s ease; }
.js .reveal { opacity: 0; transform: translateY(22px); }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1 !important; transform: none !important; }
  html { scroll-behavior: auto; }
  .browser-frame { transform: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-inner, .band-inner, .split, .split.reverse .split-copy, .footer-inner { grid-template-columns: 1fr; }
  .split.reverse .split-copy { order: 0; }
  .hero { padding-top: 54px; }
  .browser-frame { transform: none; }
  .feature-grid, .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .shot-row, .shot-row.two { grid-template-columns: 1fr; }
  .theme-grid, .doc-grid { grid-template-columns: repeat(2, 1fr); }
  .qs-grid { grid-template-columns: 1fr; }
  .strip-inner { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .arch { grid-template-columns: 1fr; gap: 16px; }
  .arch-flow { flex-direction: row; padding: 6px 0; }
  .arch-flow-line { width: 2px; height: 30px; }
  .footer-cols { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .nav {
    position: fixed; top: 64px; left: 0; right: 0; flex-direction: column; gap: 0;
    background: var(--header); border-bottom: 1px solid var(--border);
    padding: 8px 24px 18px; transform: translateY(-130%); transition: transform 0.28s ease; margin: 0;
  }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 12px 0; border-bottom: 1px solid var(--border); }
  .nav-toggle { display: flex; }
  .header-actions .btn-ghost span { display: none; }
  .feature-grid, .grid-3, .theme-grid, .doc-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; }
  .section { padding: 60px 0; }
}