:root {
  --bg: #0f1218;
  --bg-2: #151a23;
  --surface: #1a1f2b;
  --surface-2: #252b38;
  --border: #2c3242;
  --border-strong: #3a4255;
  --text: #e7e9ee;
  --text-soft: #b6bcc9;
  --text-mute: #8a90a0;
  --accent: #b08a5a;
  --accent-soft: #c9a878;
  --link: #d6c4a3;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", system-ui, sans-serif;
  --font-display: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;

  --radius: 10px;
  --radius-lg: 16px;
  --maxw: 1180px;

  --shadow: 0 1px 0 rgba(255,255,255,0.03) inset, 0 12px 32px -16px rgba(0,0,0,0.55);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--accent-soft); }

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

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: #1a1f2b; padding: 8px 12px; z-index: 100;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 30;
  background: rgba(15, 18, 24, 0.85);
  backdrop-filter: saturate(150%) blur(10px);
  -webkit-backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; gap: 24px;
  height: 64px;
}
.brand {
  display: inline-flex; align-items: center; gap: 12px;
  color: var(--text); font-weight: 600; letter-spacing: 0.02em;
}
.brand-mark { width: 36px; height: 36px; }
.brand-words { display: flex; flex-direction: column; line-height: 1.05; }
.brand-name { font-family: var(--font-display); font-size: 17px; letter-spacing: 0.04em; }
.brand-name em { font-style: normal; color: var(--accent); }
.brand-sub { font-size: 11px; letter-spacing: 0.18em; color: var(--text-mute); text-transform: uppercase; }

.primary-nav { margin-left: auto; display: flex; gap: 22px; }
.primary-nav a {
  color: var(--text-soft); font-size: 14px; letter-spacing: 0.02em;
  padding: 8px 0; border-bottom: 1px solid transparent;
}
.primary-nav a:hover { color: var(--text); border-bottom-color: var(--accent); }

.nav-toggle {
  margin-left: auto;
  display: none;
  width: 40px; height: 40px;
  background: transparent; border: 1px solid var(--border); border-radius: 8px;
  cursor: pointer; padding: 0;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav-toggle span { display: block; width: 18px; height: 1.5px; background: var(--text-soft); }

.mobile-nav {
  border-top: 1px solid var(--border);
  background: var(--bg-2);
}
.mobile-nav a {
  display: block;
  padding: 14px 24px;
  color: var(--text-soft);
  border-bottom: 1px solid var(--border);
  font-size: 15px;
}
.mobile-nav a:last-child { border-bottom: 0; }

@media (max-width: 820px) {
  .primary-nav { display: none; }
  .nav-toggle { display: inline-flex; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 96px 0 80px;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(900px 400px at 12% 10%, rgba(176,138,90,0.10), transparent 60%),
    radial-gradient(700px 500px at 92% 30%, rgba(83,107,146,0.10), transparent 60%),
    linear-gradient(180deg, #11151d 0%, var(--bg) 100%);
}
.eyebrow {
  color: var(--accent);
  font-size: 12px; letter-spacing: 0.22em; text-transform: uppercase;
  margin: 0 0 18px;
}
.section-eyebrow {
  color: var(--accent);
  font-size: 11px; letter-spacing: 0.24em; text-transform: uppercase;
  margin: 0 0 12px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 5.2vw, 60px);
  line-height: 1.05; letter-spacing: -0.015em;
  margin: 0 0 22px; max-width: 18ch; font-weight: 650;
}
.hero h1 .accent { color: var(--accent); }
.lede {
  font-size: clamp(16px, 1.6vw, 19px);
  color: var(--text-soft); max-width: 64ch; margin: 0 0 32px;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 36px; }
.hero-tags {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 10px;
}
.hero-tags li {
  font-size: 12.5px; letter-spacing: 0.06em;
  color: var(--text-soft);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
  padding: 7px 12px; border-radius: 999px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 18px;
  border-radius: 8px;
  font-size: 14.5px; font-weight: 500; letter-spacing: 0.01em;
  border: 1px solid transparent;
  transition: transform 80ms ease, background 120ms ease, border-color 120ms ease;
}
.btn-primary {
  background: var(--accent); color: #1a1f2b;
}
.btn-primary:hover { background: var(--accent-soft); color: #1a1f2b; }
.btn-ghost {
  background: transparent; color: var(--text); border-color: var(--border-strong);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-soft); }

/* ---------- Sections ---------- */
.section { padding: 96px 0; border-bottom: 1px solid var(--border); }
.section-alt { background: var(--bg-2); }
.section-dark {
  background:
    radial-gradient(800px 400px at 80% 0%, rgba(176,138,90,0.12), transparent 60%),
    linear-gradient(180deg, #0c0f15 0%, #0a0d12 100%);
}
.section h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.15; letter-spacing: -0.01em;
  margin: 0 0 18px; max-width: 22ch; font-weight: 600;
}
.section-lede {
  color: var(--text-soft); max-width: 72ch;
  font-size: clamp(15px, 1.4vw, 17px);
  margin: 0 0 40px;
}

/* ---------- Cards ---------- */
.cards {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
}
.card h3 {
  margin: 0 0 10px; font-size: 17px; font-weight: 600;
  color: var(--text);
}
.card p { margin: 0; color: var(--text-soft); font-size: 14.5px; }

/* ---------- Stack grid ---------- */
.stack-grid {
  display: grid; gap: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 8px;
  margin-bottom: 32px;
}
.stack-row {
  display: grid;
  grid-template-columns: 180px 1fr;
  align-items: center;
  gap: 16px;
  padding: 14px 16px;
  border-radius: 8px;
}
.stack-row + .stack-row { border-top: 1px solid var(--border); }
.stack-label {
  font-size: 12px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--text-mute);
}
.stack-chips { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.chip {
  display: inline-block;
  padding: 6px 10px; border-radius: 6px;
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  font-size: 13px; color: var(--text);
}
.chip-strong { border-color: var(--accent); color: var(--accent-soft); background: rgba(176,138,90,0.08); }
.chip-note { font-size: 12.5px; color: var(--text-mute); font-style: italic; padding-left: 6px; }

@media (max-width: 720px) {
  .stack-row { grid-template-columns: 1fr; gap: 8px; padding: 14px 12px; }
}

/* ---------- Callout ---------- */
.callout {
  border: 1px solid var(--border-strong);
  border-left: 3px solid var(--accent);
  background: linear-gradient(180deg, rgba(176,138,90,0.05), transparent);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-top: 24px;
}
.callout h3 { margin: 0 0 8px; color: var(--text); font-size: 16px; }
.callout p { margin: 0 0 8px; color: var(--text-soft); font-size: 14.5px; }
.callout p:last-child { margin-bottom: 0; }
.callout-soft { border-left-color: var(--border-strong); background: var(--bg-2); }

/* ---------- Architecture ---------- */
.arch-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 24px;
  align-items: start;
}
@media (max-width: 980px) {
  .arch-wrap { grid-template-columns: 1fr; }
}

.arch-diagram {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.arch-diagram svg { width: 100%; height: auto; display: block; }

.arch-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  position: relative;
  min-height: 320px;
}
.panel-close {
  position: absolute; top: 10px; right: 12px;
  width: 28px; height: 28px;
  background: transparent; color: var(--text-mute);
  border: 1px solid var(--border); border-radius: 6px;
  font-size: 18px; line-height: 1; cursor: pointer;
}
.panel-close:hover { color: var(--text); border-color: var(--accent); }
.arch-panel h3 { margin: 0 0 8px; font-size: 16px; }
.arch-panel p { margin: 0 0 10px; font-size: 14px; color: var(--text-soft); }

.panel-legend { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 8px; }
.panel-legend li {
  display: flex; align-items: center; gap: 10px;
  font-size: 13px; color: var(--text-mute);
}
.dot { width: 10px; height: 10px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border-strong); }
.dot-strong { background: rgba(176,138,90,0.4); border-color: var(--accent); }
.dot-data { background: var(--surface-2); border-color: #4d5870; }

.panel-content h3 { color: var(--accent-soft); }
.panel-content .panel-meta {
  display: inline-block;
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--text-mute); margin-bottom: 8px;
}
.panel-content ul {
  margin: 10px 0 0; padding-left: 18px;
  color: var(--text-soft); font-size: 13.5px;
}
.panel-content li { margin: 4px 0; }
.panel-swap {
  margin-top: 14px;
  padding: 10px 12px;
  background: var(--bg-2);
  border: 1px dashed var(--border-strong);
  border-radius: 6px;
  font-size: 13px; color: var(--text-soft);
}
.panel-swap strong { color: var(--accent-soft); font-weight: 600; }

.panel-link {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 14px;
  padding: 8px 12px;
  font-size: 13px; font-weight: 500;
  color: var(--accent-soft);
  background: rgba(176,138,90,0.08);
  border: 1px solid var(--accent);
  border-radius: 6px;
  text-decoration: none;
  transition: background 120ms ease, color 120ms ease;
}
.panel-link:hover { background: rgba(176,138,90,0.16); color: #e7d5b2; }
.panel-link span { font-size: 11px; opacity: 0.85; }

/* SVG node styles */
.arch-layer {
  fill: #6f7787;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.node rect {
  fill: var(--surface-2);
  stroke: var(--border-strong);
  stroke-width: 1;
  transition: fill 120ms ease, stroke 120ms ease;
}
.node text { font-family: var(--font-sans); pointer-events: none; }
.node-title { fill: var(--text); font-size: 14px; font-weight: 600; text-anchor: middle; }
.node-title-lg { fill: var(--text); font-size: 18px; font-weight: 600; text-anchor: middle; letter-spacing: 0.01em; }
.node-sub { fill: var(--text-soft); font-size: 12px; text-anchor: middle; }
.node-sub-faint { fill: var(--text-mute); font-size: 11px; text-anchor: middle; }
.node { cursor: pointer; outline: none; }
.node:hover rect, .node:focus rect, .node.is-active rect {
  fill: #2d3548; stroke: var(--accent);
}
.node-strong rect {
  fill: rgba(176,138,90,0.10);
  stroke: var(--accent);
  stroke-width: 1.5;
}
.node-strong:hover rect, .node-strong:focus rect, .node-strong.is-active rect {
  fill: rgba(176,138,90,0.18);
}
.node-data rect {
  fill: #1d2330;
  stroke: #4d5870;
  stroke-dasharray: 4 3;
}
.node-data:hover rect, .node-data:focus rect, .node-data.is-active rect {
  stroke: var(--accent);
}
.arch-link {
  stroke: #4d5566; stroke-width: 1.4; fill: none;
}

/* ---------- Phases ---------- */
.phases {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.phase {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}
.phase header { display: flex; flex-direction: column; gap: 4px; margin-bottom: 14px; }
.phase-num {
  font-family: var(--font-display);
  font-size: 12px; letter-spacing: 0.2em; color: var(--accent);
}
.phase h3 { margin: 0; font-size: 19px; color: var(--text); font-weight: 600; }
.phase-meta { font-size: 12.5px; color: var(--text-mute); }
.phase ul { margin: 0; padding-left: 18px; color: var(--text-soft); font-size: 14.5px; }
.phase li { margin: 6px 0; }
.phase-future { background: var(--bg-2); border-style: dashed; opacity: 0.92; }

/* ---------- Unknowns ---------- */
.unknown-grid {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.unknown-grid-2 { grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); }
.unknown-use-case {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 10px;
}
.unknown-body {
  margin: 12px 0 0;
  font-size: 14.5px;
  color: var(--text-soft);
  line-height: 1.6;
}
.unknown-body strong { color: var(--text); font-weight: 600; }

/* ---------- Open items ---------- */
.open-items {
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: 14px;
  max-width: 78ch;
}
.open-items li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 18px 22px;
  color: var(--text-soft);
  font-size: 14.5px;
  line-height: 1.6;
}
.open-items strong { color: var(--text); font-weight: 600; }
.unknown {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
}
.unknown h3 { margin: 0 0 4px; font-size: 16px; color: var(--text); font-weight: 600; }
.unknown-tag {
  display: inline-block;
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 12px;
}
.unknown ul { margin: 0; padding-left: 18px; color: var(--text-soft); font-size: 14px; }
.unknown li { margin: 5px 0; }

/* ---------- Next steps ---------- */
.steps { padding-left: 22px; margin: 0 0 28px; color: var(--text-soft); font-size: 15.5px; }
.steps li { margin: 8px 0; }
.steps strong { color: var(--text); font-weight: 600; }
.next-cta { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
.next-meta { color: var(--text-mute); font-size: 13px; letter-spacing: 0.04em; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: #0b0e13;
  color: var(--text-mute);
  padding: 22px 0;
}
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; font-size: 12px; letter-spacing: 0.04em; }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}