:root {
  color-scheme: light;
  --surface-1:      #fcfcfb;
  --surface-2:      #f9f9f7;
  --text-primary:   #0b0b0b;
  --text-secondary: #52514e;
  --text-muted:     #898781;
  --gridline:       #e1e0d9;
  --baseline:       #c3c2b7;
  --border:         rgba(11, 11, 11, 0.10);

  --series-1: #2a78d6; /* blue */
  --series-2: #eb6834; /* orange */
  --series-3: #1baf7a; /* aqua */
  --series-4: #eda100; /* yellow */
  --series-5: #e87ba4; /* magenta */
  --series-6: #008300; /* green */
  --series-7: #4a3aa7; /* violet */

  --status-good:     #0ca30c;
  --status-warning:  #fab219;
  --status-critical: #d03b3b;

  --seq-blue-100: #cde2fb;
  --seq-blue-300: #6da7ec;
  --seq-blue-500: #256abf;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --surface-1:      #1a1a19;
    --surface-2:      #0d0d0d;
    --text-primary:   #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted:     #898781;
    --gridline:       #2c2c2a;
    --baseline:       #383835;
    --border:         rgba(255, 255, 255, 0.10);

    --series-1: #3987e5;
    --series-2: #d95926;
    --series-3: #199e70;
    --series-4: #c98500;
    --series-5: #d55181;
    --series-6: #008300;
    --series-7: #9085e9;

    --status-good:     #0ca30c;
    --status-warning:  #fab219;
    --status-critical: #e66767;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--surface-2);
  color: var(--text-primary);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}

body { overflow-x: hidden; }

a { color: var(--series-1); }

/* ---------- Topbar ---------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  background: var(--surface-1);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 16px;
  white-space: nowrap;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: var(--series-1);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 800;
}

.tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.tab-btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font: inherit;
  font-size: 13.5px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
}

.tab-btn:hover { background: var(--surface-2); color: var(--text-primary); }

.tab-btn.active {
  background: var(--series-1);
  color: white;
}

/* ---------- Layout ---------- */

main#app {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 24px 64px;
}

.loading, .error {
  padding: 60px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
}

.panel { display: none; }
.panel.active { display: block; }

h1 { font-size: 22px; margin: 0 0 6px; }
h2 { font-size: 16px; margin: 0 0 12px; }
h3 { font-size: 13.5px; margin: 0 0 10px; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.04em; }

p { line-height: 1.55; color: var(--text-secondary); font-size: 14px; }

.section { margin-bottom: 36px; }

.card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.card + .card { margin-top: 14px; }

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

@media (max-width: 720px) {
  .grid-2 { grid-template-columns: 1fr; }
  main#app { padding: 20px 16px 48px; }
}

/* ---------- Stat tiles ---------- */

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
}

.stat-tile {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.stat-value {
  font-size: 26px;
  font-weight: 700;
  font-variant-numeric: proportional-nums;
}

.stat-value.good { color: var(--status-good); }
.stat-value.critical { color: var(--status-critical); }

/* ---------- Bars ---------- */

.bar-chart { display: flex; flex-direction: column; gap: 10px; }

.bar-row { display: grid; grid-template-columns: 150px 1fr 64px; align-items: center; gap: 10px; }

.bar-name { font-size: 12.5px; color: var(--text-secondary); text-align: right; }

.bar-track {
  position: relative;
  height: 20px;
  background: var(--surface-2);
  border-radius: 4px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: 4px;
  min-width: 3px;
}

.bar-value { font-size: 12.5px; color: var(--text-secondary); font-variant-numeric: tabular-nums; }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}

.legend-item { display: flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--text-secondary); }

.swatch { width: 10px; height: 10px; border-radius: 3px; flex-shrink: 0; }

/* ---------- Status badges ---------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11.5px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge.block { background: color-mix(in srgb, var(--status-critical) 16%, transparent); color: var(--status-critical); }
.badge.flag  { background: color-mix(in srgb, var(--status-warning) 20%, transparent); color: #8a6100; }
.badge.allow { background: color-mix(in srgb, var(--status-good) 16%, transparent); color: var(--status-good); }

@media (prefers-color-scheme: dark) {
  .badge.flag { color: var(--status-warning); }
}

/* ---------- Confusion matrix ---------- */

.confusion-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--gridline);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.confusion-cell {
  background: var(--surface-1);
  padding: 16px;
  text-align: center;
}

.confusion-cell .n { font-size: 22px; font-weight: 700; }
.confusion-cell .label { font-size: 11.5px; color: var(--text-muted); margin-top: 4px; }

/* ---------- Tables ---------- */

table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--gridline); }
th { color: var(--text-muted); font-weight: 600; font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.03em; }
td { color: var(--text-secondary); }
.table-wrap { overflow-x: auto; }
.mono { font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 11.5px; }

/* ---------- Attack cards ---------- */

.attack-card { display: grid; grid-template-columns: 4px 1fr; gap: 14px; }
.attack-stripe { border-radius: 3px; }
.attack-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.pill {
  font-size: 11px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* ---------- Proof / signature ---------- */

.sig-line {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.dot.good { background: var(--status-good); }
.dot.critical { background: var(--status-critical); }

pre.envelope {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  font-size: 11.5px;
  overflow-x: auto;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  color: var(--text-secondary);
}

/* ---------- Interactive demo: scenario picker ---------- */

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

.scenario-btn {
  appearance: none;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
}

.scenario-btn:hover { border-color: var(--series-1); }

.scenario-btn.active {
  border-color: var(--series-1);
  box-shadow: 0 0 0 1px var(--series-1);
}

.scenario-name { white-space: nowrap; }

/* ---------- Interactive demo: pipeline step cards ---------- */

.pipeline-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.pipeline-step p { font-size: 13px; margin: 8px 0 0; }

.kv-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 8px 20px;
}

.kv-row, .kv-block {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 13px;
  padding: 4px 0;
}

.kv-block { flex-direction: column; gap: 2px; margin-top: 10px; }

.kv-key { color: var(--text-muted); font-size: 12px; }
.kv-value { color: var(--text-primary); font-weight: 600; word-break: break-all; }
.kv-value.mono { font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-weight: 400; font-size: 11.5px; }

/* ---------- Interactive demo: live test form ---------- */

.live-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  align-items: end;
}

.live-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12.5px;
  color: var(--text-secondary);
  font-weight: 600;
}

.live-form input, .live-form select {
  font: inherit;
  font-size: 13.5px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-primary);
}

.submit-btn {
  appearance: none;
  border: none;
  background: var(--series-1);
  color: white;
  font: inherit;
  font-size: 13.5px;
  font-weight: 700;
  padding: 10px 18px;
  border-radius: 8px;
  cursor: pointer;
  height: fit-content;
}

.submit-btn:disabled { opacity: 0.6; cursor: default; }

.form-hint { font-size: 12px; color: var(--text-muted); margin: 14px 0 0; }

.error-inline {
  color: var(--status-critical);
  font-size: 13.5px;
  padding: 16px 0;
}

/* ---------- FAQ ---------- */

.faq-item h3 {
  text-transform: none;
  letter-spacing: normal;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.faq-item p { margin: 0; }