/* ============================================================
   AgentFlow · Shared design system
   ============================================================ */

:root {
  /* Surfaces & ink */
  --bg:        #f7f6f2;
  --bg-grid:   #efeee8;
  --surface:   #ffffff;
  --surface-2: #fbfaf6;
  --border:    #e6e4dc;
  --border-strong: #d3d0c4;
  --ink:       #1a1a18;
  --ink-2:     #44443f;
  --muted:     #7a7870;
  --subtle:    #a8a59a;

  /* Agent palette (semantic, oklch) */
  --c-pm:      oklch(0.55 0.13 252);
  --c-pm-bg:   oklch(0.97 0.025 252);
  --c-pm-bd:   oklch(0.86 0.06 252);

  --c-design:  oklch(0.52 0.16 300);
  --c-design-bg: oklch(0.97 0.03 300);
  --c-design-bd: oklch(0.85 0.07 300);

  --c-arch:    oklch(0.58 0.18 25);
  --c-arch-bg: oklch(0.96 0.03 25);
  --c-arch-bd: oklch(0.86 0.08 25);

  --c-code:    oklch(0.55 0.13 150);
  --c-code-bg: oklch(0.96 0.035 150);
  --c-code-bd: oklch(0.85 0.07 150);

  --c-review:  oklch(0.62 0.14 80);
  --c-review-bg: oklch(0.97 0.045 85);
  --c-review-bd: oklch(0.86 0.09 80);

  --c-test:    oklch(0.62 0.16 50);
  --c-test-bg: oklch(0.97 0.04 55);
  --c-test-bd: oklch(0.86 0.09 50);

  --c-deploy:  oklch(0.55 0.13 220);
  --c-deploy-bg: oklch(0.96 0.03 220);
  --c-deploy-bd: oklch(0.85 0.07 220);

  --c-utility: oklch(0.55 0.01 270);
  --c-utility-bg: oklch(0.96 0.005 270);
  --c-utility-bd: oklch(0.86 0.01 270);

  --c-done:    oklch(0.55 0.13 150);

  /* Loop / arrow colors */
  --arrow:       #6f6c63;
  --arrow-fail:  oklch(0.58 0.20 25);
  --arrow-warn:  oklch(0.62 0.16 55);
  --arrow-pass:  oklch(0.55 0.13 150);

  /* Radii & shadows */
  --r-xs: 6px;
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-pill: 999px;

  --shadow-1: 0 1px 0 rgba(20,20,16,0.04), 0 1px 2px rgba(20,20,16,0.05);
  --shadow-2: 0 1px 0 rgba(20,20,16,0.04), 0 6px 22px -10px rgba(20,20,16,0.12);
  --shadow-3: 0 1px 0 rgba(20,20,16,0.04), 0 18px 48px -16px rgba(20,20,16,0.18);

  /* Type */
  --font-sans: "Geist", "Manrope", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  background-image:
    radial-gradient(circle at 1px 1px, var(--bg-grid) 1px, transparent 0);
  background-size: 28px 28px;
  background-attachment: fixed;
}

a { color: inherit; text-decoration: none; }

/* ============================================================
   Top navigation
   ============================================================ */

.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(247,246,242,0.84);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1240px; margin: 0 auto;
  display: flex; align-items: center; gap: 24px;
  padding: 14px 28px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 600; font-size: 15px; letter-spacing: -0.01em;
  color: var(--ink);
}
.brand-mark {
  width: 26px; height: 26px; border-radius: 7px;
  background:
    radial-gradient(circle at 30% 30%, #fff 0 22%, transparent 23%),
    linear-gradient(135deg, var(--c-pm), var(--c-design));
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.4), var(--shadow-1);
}
.brand-meta {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--muted); font-size: 12px;
  padding-left: 14px; margin-left: 4px;
  border-left: 1px solid var(--border);
}
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; color: var(--ink-2);
  padding: 8px 12px; border-radius: var(--r-sm);
  transition: background 120ms ease, color 120ms ease;
}
.nav a:hover { background: rgba(0,0,0,0.04); color: var(--ink); }
.nav a.active {
  background: var(--ink);
  color: #fffdf9;
}
.nav a .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: currentColor; opacity: 0.55;
}

/* ============================================================
   Layout
   ============================================================ */

.page { max-width: 1240px; margin: 0 auto; padding: 56px 28px 120px; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted);
  padding: 6px 10px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--r-pill);
}
.eyebrow .pip {
  width: 6px; height: 6px; border-radius: 50%; background: var(--c-pm);
}

.h1 {
  font-size: 52px; line-height: 1.05; letter-spacing: -0.025em;
  font-weight: 600; margin-top: 18px; max-width: 18ch;
  text-wrap: balance;
}
.h1 em { font-style: normal; color: var(--muted); }
.lede {
  margin-top: 18px; max-width: 56ch;
  font-size: 17px; line-height: 1.6; color: var(--ink-2);
  text-wrap: pretty;
}

.section-title {
  display: flex; align-items: baseline; gap: 14px;
  margin: 64px 0 20px;
}
.section-title h2 {
  font-size: 22px; font-weight: 600; letter-spacing: -0.015em;
}
.section-title .num {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--muted); letter-spacing: 0.1em;
}
.section-title .rule {
  flex: 1; height: 1px; background: var(--border);
}

/* ============================================================
   Cards
   ============================================================ */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-1);
}
.card-pad { padding: 28px; }
.card-pad-lg { padding: 40px; }

/* Stat grid */
.stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px; background: var(--border);
  border: 1px solid var(--border); border-radius: var(--r-md);
  overflow: hidden;
}
.stat {
  background: var(--surface);
  padding: 18px 20px;
}
.stat .k {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted);
}
.stat .v {
  margin-top: 8px;
  font-size: 26px; font-weight: 600; letter-spacing: -0.02em;
}
.stat .v small {
  font-size: 13px; font-weight: 500; color: var(--muted);
  margin-left: 4px;
}

/* Legend */
.legend {
  display: flex; flex-wrap: wrap; gap: 8px 18px;
  font-size: 12.5px; color: var(--ink-2);
}
.legend-item { display: inline-flex; align-items: center; gap: 8px; }
.legend-swatch {
  width: 14px; height: 14px; border-radius: 4px;
  border: 1px solid var(--border-strong);
}
.legend-line {
  width: 22px; height: 0; border-top: 2px solid var(--arrow);
}
.legend-line.dashed { border-top-style: dashed; }
.legend-line.fail { border-top-color: var(--arrow-fail); }
.legend-line.warn { border-top-color: var(--arrow-warn); }

/* Footer */
footer.foot {
  max-width: 1240px; margin: 0 auto;
  padding: 32px 28px 56px;
  display: flex; gap: 16px; justify-content: space-between;
  color: var(--muted); font-size: 12px;
  border-top: 1px solid var(--border);
}

/* ============================================================
   Flowchart primitives (HTML+CSS nodes, SVG arrows)
   ============================================================ */

.flow {
  position: relative;
  margin: 0 auto;
}
.flow-scroll {
  overflow-x: auto;
  margin: 0 -8px;
  padding: 0 8px;
}
.flow svg.wires {
  position: absolute; inset: 0; width: 100%; height: 100%;
  pointer-events: none;
}
.node {
  position: absolute;
  background: var(--surface);
  border: 1.5px solid var(--border-strong);
  border-radius: var(--r-sm);
  padding: 12px 16px;
  box-shadow: var(--shadow-1);
  display: flex; flex-direction: column; gap: 4px;
  min-width: 160px;
}
.node .label {
  font-family: var(--font-mono);
  font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted);
}
.node .title {
  font-size: 15px; font-weight: 600; color: var(--ink);
  letter-spacing: -0.01em;
}
.node .sub {
  font-size: 12px; color: var(--muted); line-height: 1.45;
}

/* Agent variants */
.node.pm     { border-color: var(--c-pm-bd);     background: var(--c-pm-bg); }
.node.pm     .label { color: var(--c-pm); }
.node.design { border-color: var(--c-design-bd); background: var(--c-design-bg); }
.node.design .label { color: var(--c-design); }
.node.arch   { border-color: var(--c-arch-bd);   background: var(--c-arch-bg); }
.node.arch   .label { color: var(--c-arch); }
.node.code   { border-color: var(--c-code-bd);   background: var(--c-code-bg); }
.node.code   .label { color: var(--c-code); }
.node.review { border-color: var(--c-review-bd); background: var(--c-review-bg); }
.node.review .label { color: var(--c-review); }
.node.test   { border-color: var(--c-test-bd);   background: var(--c-test-bg); }
.node.test   .label { color: var(--c-test); }
.node.deploy { border-color: var(--c-deploy-bd); background: var(--c-deploy-bg); }
.node.deploy .label { color: var(--c-deploy); }
.node.util   { border-color: var(--c-utility-bd); background: var(--c-utility-bg); }
.node.util   .label { color: var(--c-utility); }

.node.done {
  background: var(--ink); color: #fffdf9;
  border-color: var(--ink);
}
.node.done .title { color: #fffdf9; }
.node.done .label { color: rgba(255,253,249,0.65); }

/* Diamond decision */
.decision {
  position: absolute;
  display: grid; place-items: center;
  width: 180px; height: 110px;
}
.decision .shape {
  position: absolute; inset: 0;
  background: var(--c-review-bd) !important;
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  border: none !important;
  border-radius: 0 !important;
  transform: none !important;
  filter: drop-shadow(0 2px 6px rgba(20,20,16,0.06));
}
.decision .shape::before {
  content: "";
  position: absolute; inset: 2.5px;
  background: var(--c-review-bg);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
}
.decision .text {
  position: relative;
  text-align: center;
  font-size: 13px; font-weight: 600; color: var(--ink);
  white-space: nowrap;
}
.decision .text small {
  display: block; font-weight: 500;
  font-size: 11px; color: var(--muted); margin-top: 2px;
}

/* Edge label */
.edge-label {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 10.5px; letter-spacing: 0.04em;
  background: var(--bg);
  padding: 2px 7px;
  border-radius: var(--r-pill);
  border: 1px solid var(--border);
  color: var(--ink-2);
  white-space: nowrap;
}
.edge-label.fail { color: var(--arrow-fail); border-color: color-mix(in oklch, var(--arrow-fail) 30%, var(--border)); }
.edge-label.warn { color: var(--arrow-warn); border-color: color-mix(in oklch, var(--arrow-warn) 30%, var(--border)); }
.edge-label.pass { color: var(--arrow-pass); border-color: color-mix(in oklch, var(--arrow-pass) 30%, var(--border)); }

/* Group frame (dashed area enclosing multiple nodes) */
.frame {
  position: absolute;
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--r-md);
  pointer-events: none;
}
.frame .frame-label {
  position: absolute; top: -10px; left: 16px;
  background: var(--bg);
  padding: 0 8px;
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted);
}

/* Pill */
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: var(--r-pill);
  background: var(--surface-2); border: 1px solid var(--border);
  font-size: 11.5px; color: var(--ink-2);
}
.pill .dot { width: 6px; height: 6px; border-radius: 50%; }

/* Two-column intro */
.intro {
  display: grid; grid-template-columns: 1.4fr 1fr;
  gap: 48px; align-items: end;
}
@media (max-width: 880px) {
  .intro { grid-template-columns: 1fr; }
  .h1 { font-size: 40px; }
}

/* Notes column */
.note-list { display: grid; gap: 12px; }
.note {
  display: grid; grid-template-columns: 28px 1fr;
  gap: 12px; align-items: start;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
}
.note .n {
  font-family: var(--font-mono);
  font-size: 11px; color: var(--muted);
  padding-top: 2px;
}
.note .t { font-size: 13.5px; line-height: 1.55; color: var(--ink-2); }
.note .t strong { color: var(--ink); font-weight: 600; }

/* Chips row */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 10px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--r-pill);
  font-size: 12px; color: var(--ink-2);
}
.chip .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--muted); }

/* Mini cards */
.mini-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}
.mini {
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
}
.mini .label {
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted);
}
.mini .head {
  margin-top: 6px; font-size: 15px; font-weight: 600;
  color: var(--ink); letter-spacing: -0.01em;
}
.mini .body {
  margin-top: 6px; font-size: 12.5px; line-height: 1.55;
  color: var(--ink-2);
}

/* Step list (numbered) */
.steps { counter-reset: step; display: grid; gap: 14px; }
.steps .step {
  display: grid; grid-template-columns: 36px 1fr;
  gap: 14px; align-items: start;
  padding: 16px 18px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--r-sm);
}
.steps .step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-mono); font-size: 11px;
  color: var(--muted);
  padding-top: 2px;
}
.steps .step .head {
  font-size: 14.5px; font-weight: 600; color: var(--ink); letter-spacing: -0.01em;
}
.steps .step .body {
  margin-top: 4px; font-size: 12.5px; line-height: 1.55; color: var(--ink-2);
}