/* Complexity Routing — enterprise design-system styling:
   monochrome ink on white/off-white, one brand blue as the only
   interactive signal, flat surfaces separated by hairlines. */

/* ---------- Fonts (bundled locally) ---------- */

@font-face { font-family: "TT Norms Pro"; font-weight: 300; font-style: normal; font-display: swap; src: url("fonts/TTNormsPro-Light-300.woff2") format("woff2"); }
@font-face { font-family: "TT Norms Pro"; font-weight: 400; font-style: normal; font-display: swap; src: url("fonts/TTNormsPro-Regular-400.woff2") format("woff2"); }
@font-face { font-family: "TT Norms Pro"; font-weight: 500; font-style: normal; font-display: swap; src: url("fonts/TTNormsPro-Medium-500.woff2") format("woff2"); }
@font-face { font-family: "TT Norms Pro"; font-weight: 600; font-style: normal; font-display: swap; src: url("fonts/TTNormsPro-DemiBold-600.woff2") format("woff2"); }
@font-face { font-family: "TT Norms Pro"; font-weight: 700; font-style: normal; font-display: swap; src: url("fonts/TTNormsPro-Bold-700.woff2") format("woff2"); }

@font-face { font-family: "Poppins"; font-weight: 300; font-style: normal; font-display: swap; src: url("fonts/poppins/Poppins-Light-300.woff2") format("woff2"); }
@font-face { font-family: "Poppins"; font-weight: 400; font-style: normal; font-display: swap; src: url("fonts/poppins/Poppins-Regular-400.woff2") format("woff2"); }
@font-face { font-family: "Poppins"; font-weight: 500; font-style: normal; font-display: swap; src: url("fonts/poppins/Poppins-Medium-500.woff2") format("woff2"); }
@font-face { font-family: "Poppins"; font-weight: 600; font-style: normal; font-display: swap; src: url("fonts/poppins/Poppins-SemiBold-600.woff2") format("woff2"); }
@font-face { font-family: "Poppins"; font-weight: 700; font-style: normal; font-display: swap; src: url("fonts/poppins/Poppins-Bold-700.woff2") format("woff2"); }

/* ---------- Tokens ---------- */

:root {
  /* Ink & neutrals */
  --ink: #030E16;
  --ink-2: #26313D;
  --muted: #536573;
  --bg: #F7F9FB;
  --surface: #FFFFFF;
  --surface-2: #F0F3F6;
  --surface-3: #E5EBF1;
  --border: #CFD6DE;
  --border-soft: #DBE1E8;
  --hairline: #EDF1F4;

  /* The single brand blue */
  --primary: #007FAF;
  --primary-hover: #006C93;
  --primary-active: #00567A;
  --primary-ink: #FAFBFC;
  --primary-container: #BDE9FA;
  --primary-tint: #E7F5FC;

  --navy: #15374C;
  --success: #007D3A;
  --success-container: #DAF7E2;
  --warning: #8A6100;
  --warning-container: #FFF3D6;
  --error: #9E251A;
  --error-container: #FDD9D3;

  /* Type */
  --font-sans: "TT Norms Pro", "Poppins", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;

  /* Shape */
  --radius-control: 3px;
  --radius-chip: 999px;
  --radius-card: 12px;

  /* Elevation — used sparingly, one soft card shadow */
  --shadow-card: 0 1px 2px rgba(3, 14, 22, 0.04), 0 8px 24px rgba(3, 14, 22, 0.05);
}

/* ---------- Base ---------- */

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink-2);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }

h1, h2, h3 { color: var(--ink); font-weight: 500; letter-spacing: -0.01em; }

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

img, svg { display: block; }

button { font: inherit; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 2px;
}

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

.micro {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* ---------- Header ---------- */

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border-soft);
}

.header-in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 600;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
}

.brand:hover { text-decoration: none; }

.brand-mark { width: 26px; height: 26px; }

.header-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-cta {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--primary);
}

/* ---------- Demo ---------- */

.demo-zone { padding: 34px 0 10px; }

.demo-head { margin-bottom: 18px; }

.demo-head h2 { font-size: 1.7rem; }

.demo-sub { margin-top: 6px; color: var(--muted); font-size: 0.98rem; }

.demo-head-row { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; }

.engine { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px; border: 1px solid var(--border-soft); border-radius: var(--radius-chip); background: var(--surface); font-size: 0.8rem; font-weight: 600; color: var(--muted); white-space: nowrap; }

.engine-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--border); }

.engine[data-state="on"] .engine-dot { background: var(--success); box-shadow: 0 0 0 3px var(--success-container); }

.engine[data-state="off"] .engine-dot { background: var(--warning); box-shadow: 0 0 0 3px var(--warning-container); }

.scenario-bar {
  background: var(--primary-tint);
  border: 1px solid var(--primary-container);
  border-radius: var(--radius-card);
  padding: 20px 22px 16px;
  margin-bottom: 18px;
}

.scenario-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
}

.scenario-controls .micro { flex: none; }

.scenario-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.scenario-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-chip);
  color: var(--ink-2);
  font-family: inherit;
  font-size: 0.86rem;
  font-weight: 500;
  padding: 6px 14px;
  transition: border-color 120ms ease, color 120ms ease, background-color 120ms ease;
}

.scenario-btn:hover { border-color: var(--primary); color: var(--primary); }

.scenario-btn[aria-pressed="true"] {
  background: var(--primary);
  border-color: var(--primary);
  color: #FFFFFF;
}

.scenario-hint {
  width: 100%;
  color: var(--muted);
  font-size: 0.92rem;
}

.example-block {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--primary-container);
}

.examples {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.example-chip {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-chip);
  color: var(--ink-2);
  font-size: 0.86rem;
  font-weight: 500;
  padding: 6px 14px;
  transition: border-color 120ms ease, color 120ms ease, background-color 120ms ease;
}

.example-chip:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.example-chip[aria-pressed="true"] {
  background: var(--primary-container);
  border-color: var(--primary-container);
  color: var(--ink);
}

.route-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 18px;
  align-items: stretch;
  position: relative;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.prompt-card,
.result-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px;
}

.prompt-input {
  width: 100%;
  min-height: 148px;
  resize: vertical;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--ink);
  font-family: inherit;
  font-size: 1.02rem;
  line-height: 1.55;
  padding: 14px 16px;
}

.prompt-input::placeholder { color: #8B9AA8; }

.prompt-input:hover { border-color: var(--muted); }

.prompt-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-container);
}

.prompt-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.btn {
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 12px 20px;
  transition: background-color 120ms ease, border-color 120ms ease;
}

.btn-primary {
  background: var(--primary);
  color: var(--primary-ink);
  font-size: 0.95rem;
}

.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:active { background: var(--primary-active); }

.route-status { font-size: 0.88rem; color: var(--muted); }

.result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 26px;
}

.top-pick {
  background: var(--primary-container);
  border-radius: 4px;
  color: var(--navy);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 4px 10px;
  max-width: 62%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lanes {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0;
  list-style: none;
  flex: 1;
}

.lane {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr) 52px;
  align-items: center;
  gap: 12px;
  padding: 7px 0;
  border-bottom: 1px solid var(--hairline);
}

.lane:last-child { border-bottom: 0; }

.lane-name {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.35;
}

.lane-track {
  background: var(--surface-3);
  border-radius: var(--radius-chip);
  height: 8px;
  overflow: hidden;
}

.lane-fill {
  background: #A9C9DB;
  border-radius: var(--radius-chip);
  height: 100%;
  width: 0;
  transition: width 460ms cubic-bezier(0.2, 0.7, 0.3, 1);
}

.lane-pct {
  color: var(--muted);
  font-size: 0.86rem;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.lane.is-top .lane-name { color: var(--ink); font-weight: 600; }
.lane.is-top .lane-fill { background: var(--primary); }
.lane.is-top .lane-pct { color: var(--ink); font-weight: 600; }

.flow {
  position: absolute;
  inset: 0;
  overflow: visible;
  pointer-events: none;
  z-index: 3;
}

.flow-base {
  fill: none;
  stroke: var(--primary);
  stroke-dasharray: 2 6;
  stroke-linecap: round;
  stroke-opacity: 0.18;
  stroke-width: 1.5;
}

.flow-line {
  fill: none;
  filter: drop-shadow(0 0 4px rgba(0, 127, 175, 0.35));
  stroke: var(--primary);
  stroke-linecap: round;
  stroke-width: 2.5;
}

.flow-dot {
  fill: var(--primary);
  filter: drop-shadow(0 0 7px rgba(0, 127, 175, 0.75));
  transition: opacity 260ms ease;
}

.flow-dot.is-done { opacity: 0; }

.lane.is-lit .lane-track {
  animation: lane-glow 620ms ease-out 1;
  box-shadow: 0 0 0 3px var(--primary-container);
}

.lane.is-lit .lane-fill { background: var(--primary); }

@keyframes lane-glow {
  0% { box-shadow: 0 0 0 0 rgba(0, 127, 175, 0.45); }
  100% { box-shadow: 0 0 0 3px var(--primary-container); }
}

.engine-note {
  border-top: 1px solid var(--hairline);
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.55;
  margin-top: auto;
  padding-top: 10px;
}

/* ---------- Value cards ---------- */

.use { padding: 68px 0 8px; }

.section-lede {
  margin-top: 10px;
  max-width: 68ch;
  color: var(--muted);
  font-size: 1.02rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 26px;
}

.use-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px;
}

.use-icon {
  width: 34px; height: 34px;
  border-radius: 6px;
  background: var(--primary-tint);
  display: grid;
  place-items: center;
}

.use-card h3 { font-size: 1.08rem; }

.use-card p { color: var(--muted); font-size: 0.94rem; }

/* ---------- How it works ---------- */

.how { padding: 68px 0 8px; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 26px;
}

.step {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-card);
  padding: 24px;
}

.step-num {
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.step h3 { margin-top: 10px; font-size: 1.08rem; }
.step p { margin-top: 8px; color: var(--muted); font-size: 0.94rem; }

.pipeline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-top: 22px;
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-card);
}

.pipe-node {
  background: var(--surface-2);
  border-radius: 4px;
  color: var(--ink-2);
  font-size: 0.86rem;
  font-weight: 500;
  padding: 6px 12px;
  white-space: nowrap;
}

.pipe-node.is-accent { background: var(--primary-container); color: var(--navy); }

.pipe-arrow { color: var(--muted); font-size: 0.9rem; }

/* ---------- Scenarios grid ---------- */

.scenarios { padding: 68px 0 12px; }

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 26px;
}

.scenario-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-card);
  padding: 20px;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

.scenario-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-card);
}

.scenario-card .scenario-card-title {
  color: var(--ink);
  font-size: 1.02rem;
  font-weight: 600;
}

.scenario-card .scenario-card-meta { color: var(--muted); font-size: 0.86rem; }

.scenario-card .scenario-card-lanes {
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.5;
}

.badge-default {
  background: var(--primary-container);
  border-radius: 4px;
  color: var(--navy);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 3px 8px;
  text-transform: uppercase;
}

.badge-custom {
  background: var(--warning-container);
  border-radius: 4px;
  color: var(--warning);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 3px 8px;
  text-transform: uppercase;
}

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

@media (max-width: 900px) {
  .route-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .prompt-actions { flex-wrap: wrap; }
  .lane { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr) 46px; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .lane-fill, .example-chip, .btn { transition: none; }
  .flow-dot { display: none; }
  .lane.is-lit .lane-track { animation: none; }
}