/* agent-challenge docs — v5 */
:root {
  --bg: #0a0e17;
  --bg-card: #0f1520;
  --border: #1a2235;
  --text: #c8d0e0;
  --text-muted: #5a6580;
  --accent: #00ff88;
  --accent-dim: rgba(0,255,136,0.12);
  --red: #ff4466;
  --yellow: #ffcc00;
  --mono: 'SF Mono', 'Cascadia Code', 'JetBrains Mono', Consolas, monospace;
}

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

body {
  font-family: var(--mono);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 0.85rem;
}

.container {
  max-width: 1020px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

/* ── Hero ──────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 3rem 0 2.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 3rem;
}

.hero-badge {
  display: inline-block;
  background: var(--accent-dim);
  color: var(--accent);
  padding: 0.3rem 0.8rem;
  border-radius: 4px;
  font-size: 0.75rem;
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: 1.8rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.75rem;
}

.bracket { color: var(--accent); }

.open-source-badge {
  display: inline-block;
  background: rgba(0,255,136,0.06);
  border: 1px solid rgba(0,255,136,0.2);
  border-radius: 20px;
  padding: 0.4rem 1rem;
  font-size: 0.78rem;
  color: var(--accent);
  margin-bottom: 1rem;
  letter-spacing: 0.01em;
}
.hero-tagline {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

.hero-links { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

/* ── Buttons ──────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 0.5rem 1.2rem;
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 0.8rem;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid var(--border);
  transition: all 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  font-weight: 600;
}
.btn-primary:hover { opacity: 0.85; }

.btn-secondary {
  background: transparent;
  color: var(--text);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

.btn-link {
  background: none;
  border: none;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 0.5rem 0;
}
.btn-link:hover { text-decoration: underline; }

/* ── Sections ─────────────────────────────────── */
section {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

section:last-of-type { border-bottom: none; }

h2 {
  font-size: 1.1rem;
  color: #fff;
  margin-bottom: 0.5rem;
}

.section-number {
  color: var(--accent);
  margin-right: 0.5rem;
  font-weight: 400;
}

.section-desc {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-size: 0.82rem;
}

/* ── Flow Cards ───────────────────────────────── */
.flow-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.flow-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  position: relative;
}

.flow-card-num {
  position: absolute;
  top: -0.6rem;
  left: 0.75rem;
  background: var(--accent);
  color: var(--bg);
  width: 1.3rem;
  height: 1.3rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
}

.flow-card-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  padding-top: 0.3rem;
}

.flow-card-body pre {
  font-size: 0.72rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}
.flow-card-body .dim {
  color: rgba(255,255,255,0.35);
  font-size: 0.68rem;
}

/* ── Callout ──────────────────────────────────── */
.callout-box {
  background: rgba(0,255,136,0.04);
  border: 1px solid var(--accent-dim);
  border-left: 3px solid rgba(0,255,136,0.4);
  border-radius: 6px;
  padding: 0.85rem 1rem;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--text);
}

.callout-box strong { color: var(--accent); }
.callout-box code { color: var(--accent); background: rgba(0,255,136,0.08); padding: 0.1rem 0.3rem; border-radius: 3px; }

/* ── Code ─────────────────────────────────────── */
.code-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  font-size: 0.75rem;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.code-tabs {
  display: flex;
  gap: 0;
  margin-bottom: -1px;
  position: relative;
  z-index: 1;
}

.code-tab {
  background: transparent;
  border: 1px solid var(--border);
  border-bottom: none;
  color: var(--text-muted);
  padding: 0.4rem 1rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  cursor: pointer;
  border-radius: 6px 6px 0 0;
}

.code-tab.active {
  background: var(--bg-card);
  color: var(--accent);
  border-color: var(--border);
}

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

.code-panel .code-block {
  border-radius: 0 8px 8px 8px;
}

/* Syntax */
.kw { color: #c792ea; }
.str { color: #c3e88d; }
.num { color: #f78c6c; }
.fn { color: #82aaff; }
.key { color: #89ddff; }
.dim { color: var(--text-muted); }

/* ── Type Grid ────────────────────────────────── */
.type-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.type-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 0.8rem;
  font-size: 0.75rem;
}

.type-card.hidden-type { display: none; }
.type-card.visible { display: block; }

.type-diff {
  font-size: 0.65rem;
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.type-diff.easy { background: rgba(0,255,136,0.15); color: var(--accent); }
.type-diff.medium { background: rgba(255,204,0,0.15); color: var(--yellow); }
.type-diff.hard { background: rgba(255,68,102,0.15); color: var(--red); }
.type-diff.agentic { background: rgba(180,0,255,0.15); color: #c77dff; }

/* ── API Reference ────────────────────────────── */
.api-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  margin-bottom: 0.75rem;
}

.api-card h3 {
  font-size: 0.85rem;
  color: #fff;
  margin-bottom: 0.5rem;
}

.api-card p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.api-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.75rem;
  margin-top: 0.5rem;
}

.api-table td {
  padding: 0.4rem 0.5rem;
  border-bottom: 1px solid var(--border);
}

.api-table tr:first-child td {
  font-weight: 600;
  color: #fff;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.api-table code {
  color: var(--accent);
  background: rgba(0,255,136,0.08);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  font-size: 0.72rem;
}

.subsection {
  font-size: 0.85rem;
  color: #fff;
  margin: 1.5rem 0 0.75rem;
}

/* ── Demo ─────────────────────────────────────── */
.demo-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
}

.demo-step {
  margin-bottom: 1.25rem;
}

.demo-step:last-child { margin-bottom: 0; }

.demo-step-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  font-size: 0.8rem;
}

.demo-step-num {
  background: var(--accent);
  color: var(--bg);
  width: 1.2rem;
  height: 1.2rem;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 700;
  flex-shrink: 0;
}

.demo-output {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  font-size: 0.72rem;
  margin-top: 0.75rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-all;
}

.demo-input-row {
  display: flex;
  gap: 0.5rem;
}

.demo-input-row input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.8rem;
  outline: none;
}

.demo-input-row input:focus { border-color: var(--accent); }

/* ── Demo Mode Toggle ─────────────────────────── */
.demo-mode-toggle {
  display: flex;
  gap: 0;
  margin-bottom: 1rem;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
  width: fit-content;
}
.demo-mode-btn {
  background: var(--bg-card);
  border: none;
  color: var(--text-muted);
  padding: 0.55rem 1.25rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}
.demo-mode-btn:first-child { border-right: 1px solid var(--border); }
.demo-mode-btn:hover { color: var(--text); }
.demo-mode-btn.active {
  background: rgba(0,255,136,0.08);
  color: var(--accent);
  font-weight: 600;
}
.demo-mode-btn.active[data-mode="lock"] {
  background: rgba(255,107,107,0.08);
  color: #ff6b6b;
}

/* ── Demo Timer ───────────────────────────────── */
.demo-timer {
  position: relative;
  height: 28px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 0.75rem;
  overflow: hidden;
}
.demo-timer-bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: rgba(0,255,136,0.15);
  border-radius: 5px;
  transition: width 0.1s linear;
}
.demo-timer-bar.timer-urgent {
  background: rgba(255,107,107,0.25);
}
.demo-timer-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text);
  z-index: 1;
}

/* ── Demo Timeout Message ─────────────────────── */
.demo-timeout-message {
  text-align: center;
  padding: 1.5rem 1rem;
}
.demo-timeout-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 0.5rem;
}
.demo-timeout-message strong {
  color: #ff6b6b;
  font-size: 1.1rem;
  display: block;
  margin-bottom: 0.4rem;
}
.demo-timeout-message p {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-bottom: 1rem;
}

.hidden { display: none !important; }

/* ── Footer ───────────────────────────────────── */
footer {
  text-align: center;
  padding: 2rem 0 1rem;
  color: var(--text-muted);
  font-size: 0.75rem;
}

footer a {
  color: var(--text-muted);
  text-decoration: none;
}

footer a:hover { color: var(--accent); }

/* ── Use Case Section ─────────────────────────── */
.use-case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin: 1.5rem 0;
}
.use-case-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.75rem;
  transition: border-color 0.2s;
}
.use-case-card:hover { border-color: var(--accent); }
.use-case-strict { border-color: rgba(255, 107, 107, 0.2); }
.use-case-strict:hover { border-color: rgba(255, 107, 107, 0.5); }
.use-case-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
}
.use-case-icon { font-size: 1.4rem; }
.use-case-header h3 {
  font-size: 0.95rem;
  color: var(--text);
  margin: 0;
}
.use-case-card p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}
.use-case-config {
  margin: 1rem 0;
}
.use-case-config .code-block {
  font-size: 0.75rem;
  padding: 1rem;
  margin: 0;
}
.use-case-result {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}
.use-case-result span {
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  font-weight: 600;
}
.use-case-result .pass {
  color: #0f8;
  background: rgba(0, 255, 136, 0.08);
  border: 1px solid rgba(0, 255, 136, 0.15);
}
.use-case-result .fail {
  color: #ff6b6b;
  background: rgba(255, 107, 107, 0.08);
  border: 1px solid rgba(255, 107, 107, 0.15);
}
/* ── Flow Mode Labels ─────────────────────────── */
.flow-mode-label {
  font-size: 0.95rem;
  color: var(--text);
  margin: 1.5rem 0 0.3rem;
  font-weight: 600;
}
.flow-mode-label .dim {
  font-weight: 400;
}
.flow-mode-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  line-height: 1.55;
}
/* ── Model Compatibility Table ────────────────── */
.model-table {
  margin: 1rem 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.model-row {
  display: grid;
  grid-template-columns: 1fr 50px 50px 50px 60px;
  align-items: center;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.model-row:last-child { border-bottom: none; }
.model-header {
  background: rgba(255,255,255,0.03);
  font-weight: 600;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.model-name {
  font-size: 0.8rem;
  color: var(--text);
}
.model-tier {
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
}
.tier-pass { color: #0f8; }
.tier-warn { color: #f0a; }
.tier-fail { color: #ff6b6b; }
.model-footnote {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
  line-height: 1.5;
}

.secret-callout {
  border-left: 3px solid var(--accent);
  background: rgba(0, 255, 136, 0.03);
}
.secret-callout code {
  color: var(--accent);
}
.why-summary {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 0.5rem;
  line-height: 1.6;
}
.why-summary strong {
  color: var(--accent);
}

/* ── Security Section ─────────────────────────── */
#security { margin-top: 3rem; }
.security-intro { margin-bottom: 1.5rem; color: var(--text); line-height: 1.7; }
.security-intro strong { color: var(--accent); }

.security-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 1rem;
  overflow: hidden;
}
.security-card.threat { border-left: 3px solid var(--red); }
.security-card.defense { border-left: 3px solid var(--accent); }
.security-card.recommendation { border-left: 3px solid #7c5cff; }

.security-card-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: rgba(255,255,255,0.02);
  border-bottom: 1px solid var(--border);
}
.security-card-header h3 {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text);
  font-weight: 600;
}
.security-icon { font-size: 1.1rem; }

.security-card-body {
  padding: 1rem;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--text);
}
.security-card-body p { margin-bottom: 0.75rem; }
.security-card-body p:last-child { margin-bottom: 0; }
.security-card-body ul, .security-card-body ol {
  margin: 0.5rem 0 0.75rem;
  padding-left: 1.2rem;
}
.security-card-body li { margin-bottom: 0.4rem; }
.security-card-body code {
  background: rgba(0,255,136,0.08);
  color: var(--accent);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.75rem;
}
.security-card-body em { color: var(--text-muted); }
.security-card .code-block { margin: 0.75rem 0; }
.security-card .code-tabs { margin-top: 0.75rem; }
.env-callout {
  background: rgba(0,255,136,0.04);
  border: 1px solid rgba(0,255,136,0.15);
  border-radius: 6px;
  padding: 0.6rem 0.8rem;
  font-size: 0.72rem;
  line-height: 1.6;
  margin-top: 0.75rem;
  color: var(--text);
}
.defend-link {
  display: inline-block;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.78rem;
  text-decoration: none;
  margin-top: 0.25rem;
}
.defend-link:hover { text-decoration: underline; }
.env-callout code {
  background: rgba(0,255,136,0.08);
  color: var(--accent);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  font-size: 0.7rem;
}

/* ── Mobile ───────────────────────────────────── */
@media (max-width: 700px) {
  .container { padding: 1.25rem 1rem 2rem; }
  .hero { padding: 2rem 0 1.5rem; }
  .hero h1 { font-size: 1.3rem; }
  .flow-cards { grid-template-columns: 1fr; }
  .use-case-grid { grid-template-columns: 1fr; }
  .type-grid { grid-template-columns: 1fr; }
  .demo-input-row { flex-direction: column; }
  .code-block { font-size: 0.68rem; padding: 0.75rem; }
}

/* ── Audience Toggle (Human / Agent) ────────────────── */
.audience-toggle {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin: 1.5rem auto 0.5rem;
  width: fit-content;
}
.audience-btn {
  background: transparent;
  color: var(--text-dim);
  border: none;
  padding: 0.6rem 1.4rem;
  cursor: pointer;
  font-size: 0.9rem;
  font-family: inherit;
  transition: all 0.2s;
}
.audience-btn.active {
  background: var(--accent);
  color: #000;
  font-weight: 600;
}
.audience-btn:hover:not(.active) {
  background: rgba(255,255,255,0.05);
  color: var(--text);
}

/* Agent banner */
.agent-banner {
  background: linear-gradient(135deg, rgba(0,200,150,0.08), rgba(0,150,255,0.08));
  border: 1px solid rgba(0,200,150,0.3);
  border-radius: 10px;
  padding: 1.2rem 1.5rem;
  margin: 1rem 0;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  animation: bannerSlide 0.3s ease-out;
}
@keyframes bannerSlide {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}
.agent-banner-icon {
  font-size: 2rem;
  flex-shrink: 0;
}
.agent-banner-text {
  color: var(--text);
  line-height: 1.6;
}
.agent-banner-text a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.agent-banner-text a:hover {
  color: #fff;
}

/* ── Tier Headings ──────────────────────────────────── */
.tier-heading {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
  padding-left: 0.5rem;
  border-left: 3px solid var(--border);
}
.tier-heading.tier-easy { border-color: #22c55e; color: #22c55e; }
.tier-heading.tier-medium { border-color: #f59e0b; color: #f59e0b; }
.tier-heading.tier-hard { border-color: #ef4444; color: #ef4444; }
.tier-heading.tier-agentic { border-color: #a855f7; color: #a855f7; }
.tier-count {
  font-size: 0.75rem;
  opacity: 0.7;
  font-weight: 400;
  margin-left: 0.5rem;
}
.tier-desc {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-weight: 400;
  margin-left: 0.3rem;
}

/* Empirical badge */
.empirical-badge {
  font-size: 0.65rem;
  background: rgba(0,200,150,0.15);
  color: #00c896;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-weight: 500;
  margin-left: 0.5rem;
  vertical-align: middle;
}