/* ── VerifiQuant Design System ── */
:root {
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --primary: #0f766e;
  --primary-dark: #115e59;
  --primary-light: #ccfbf1;
  --accent: #06b6d4;
  --bg: #fafafa;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --text: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
  --max-w: 1100px;
}

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

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text);
}

.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-weight: 800;
  font-size: 0.75rem;
  border-radius: 8px;
  letter-spacing: -0.5px;
}

.logo-text {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.3px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.nav-link {
  padding: 0.45rem 0.85rem;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.9rem;
  transition: all 0.15s;
}

.nav-link:hover { color: var(--text); background: var(--border-light); }
.nav-link.active { color: var(--primary); background: var(--primary-light); }
.nav-link.external { color: var(--accent); }

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.mobile-menu-btn span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: 0.2s;
}

.mobile-menu-btn.open span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.mobile-menu-btn.open span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.open span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 0.5rem 1.5rem 1rem;
  border-top: 1px solid var(--border);
}

.mobile-menu .nav-link {
  padding: 0.7rem 0;
  border-radius: 0;
}

/* ── HERO ── */
.hero {
  padding: 5rem 1.5rem 4rem;
  text-align: center;
  background: linear-gradient(180deg, #fff 0%, var(--bg) 100%);
}

.hero-inner {
  max-width: 720px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  color: var(--primary);
  background: var(--primary-light);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1px;
  margin: 0 0 1.2rem;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

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

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.92rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

.btn-outline {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-outline:hover { background: var(--surface-alt); }
.btn-block { width: 100%; }
.btn-lg { padding: 0.85rem 2rem; font-size: 1rem; }
.btn-sm { padding: 0.45rem 0.9rem; font-size: 0.85rem; }

/* ── FEATURES ── */
.features {
  padding: 4rem 1.5rem;
}

.features-inner, .results-inner, .cta-inner, .about-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.section-title {
  font-size: 1.8rem;
  font-weight: 800;
  text-align: center;
  margin: 0 0 0.5rem;
  letter-spacing: -0.5px;
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

.funnel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
}

.funnel-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: box-shadow 0.2s, transform 0.2s;
}

.funnel-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.funnel-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  font-weight: 800;
  font-size: 1.1rem;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  margin-bottom: 0.8rem;
}

.funnel-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  font-weight: 700;
}

.funnel-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* ── RESULTS TABLE ── */
.results-section {
  padding: 4rem 1.5rem;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.results-table-wrap {
  overflow-x: auto;
  margin-bottom: 1rem;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.results-table th {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--border);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.results-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-light);
}

.results-table .highlight-row {
  background: var(--primary-light);
}

.results-note {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

/* ── CTA ── */
.cta-section {
  padding: 4rem 1.5rem;
  text-align: center;
}

.cta-inner h2 {
  font-size: 1.8rem;
  font-weight: 800;
  margin: 0 0 0.5rem;
}

.cta-inner p {
  color: var(--text-muted);
  margin: 0 0 1.5rem;
}

/* ── ABOUT ── */
.about-section {
  padding: 3rem 1.5rem 4rem;
}

.about-inner {
  max-width: 780px;
}

.about-inner h1 {
  font-size: 2rem;
  font-weight: 800;
  margin: 0 0 2rem;
  letter-spacing: -0.5px;
}

.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.about-card h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 0.6rem;
}

.about-card p {
  color: var(--text-muted);
  margin: 0 0 0.5rem;
  line-height: 1.7;
}

.about-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--text-muted);
}

.about-list li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.8rem;
}

.tech-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.6rem;
  background: var(--surface-alt);
  border-radius: var(--radius-sm);
}

.tech-item strong {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-light);
}

.tech-item span {
  font-weight: 600;
  font-size: 0.92rem;
}

.about-author {
  border: 2px solid var(--primary-light);
  background: linear-gradient(135deg, #fff, var(--primary-light));
}

.author-links {
  display: flex;
  gap: 0.6rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

/* ── DEMO PAGE ── */
.demo-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

.demo-header {
  margin-bottom: 1.5rem;
}

.demo-header h1 {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 0 0 0.3rem;
}

.demo-header p {
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}

.rate-limit-bar {
  font-size: 0.82rem;
  color: var(--text-light);
}

.demo-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.optional {
  font-weight: 400;
  color: var(--text-light);
  font-size: 0.85rem;
}

.advanced-toggle {
  margin-bottom: 1rem;
}

.advanced-toggle summary {
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.3rem 0;
}

/* ── SHARED FORM ELEMENTS (Demo) ── */
.tab-nav {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tab-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  border-radius: 999px;
  padding: 0.5rem 1rem;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  font-family: var(--font);
  transition: all 0.15s;
}

.tab-btn.active {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border-color: transparent;
}

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

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.8rem;
}

textarea, input[type="text"], input[type="number"] {
  width: 100%;
  box-sizing: border-box;
  font-size: 0.9rem;
  font-family: var(--font);
  padding: 0.65rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.15s;
}

textarea:focus, input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.1);
}

.inline-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.cards-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  padding: 0.6rem 0;
}

#cards-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ── RESULT / DIAGNOSTIC OUTPUT ── */
.result {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-top: 0.75rem;
}

.loader {
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  max-width: 320px;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.spinner {
  width: 20px;
  height: 20px;
  border: 2.5px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.hidden { display: none !important; }

code {
  font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;
  background: var(--surface-alt);
  border: 1px solid var(--border-light);
  padding: 0.1rem 0.35rem;
  border-radius: 5px;
  font-size: 0.85em;
}

pre {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.5;
}

.meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.badge {
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  color: #fff;
  font-size: 0.78rem;
  font-weight: 600;
}

.badge-success { background: #15803d; }
.badge-alert { background: #b45309; }
.badge-error { background: #be123c; }
.badge-refusal { background: #334155; }
.badge-needs_clarification { background: #7c3aed; }

.result-output {
  font-size: 1.1rem;
  font-weight: 700;
  padding: 0.75rem;
  background: var(--primary-light);
  border-radius: var(--radius-sm);
  margin: 0.5rem 0;
}

/* ── REPAIR / INTERACTIVE SECTIONS ── */
.repair-section {
  margin-top: 1rem;
  border-top: 1px dashed var(--border);
  padding-top: 0.9rem;
}

.repair-card {
  border: 1px solid #c7d2fe;
  border-radius: var(--radius);
  padding: 0.75rem;
  margin-bottom: 0.65rem;
  background: #eef2ff;
}

.repair-card h4 { margin: 0 0 0.4rem; }
.repair-card p { margin: 0 0 0.3rem; }

.repair-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.65rem;
}

.repair-field { margin: 0; }

.repair-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.repair-actions button {
  font-family: var(--font);
}

/* ── DOMAIN / CARDS ── */
.domain-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.8rem;
  padding: 0.85rem;
}

.domain-block h3 { margin: 0 0 0.5rem; font-size: 1rem; }
.domain-block details { margin-bottom: 0.4rem; }
.domain-block summary { cursor: pointer; font-weight: 500; color: var(--text-muted); }
.card-list { margin: 0.5rem 0 0; padding-left: 1.1rem; }
.card-list li { margin-bottom: 0.25rem; font-size: 0.9rem; }

/* ── TRACE SECTIONS ── */
.trace-section {
  margin-top: 0.9rem;
  border-top: 1px dashed var(--border);
  padding-top: 0.8rem;
}

.trace-section h3 { margin: 0 0 0.5rem; font-size: 0.95rem; }

.timeline-grid { display: grid; gap: 0.5rem; }

.timeline-step {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.65rem;
  background: var(--surface-alt);
}

.timeline-head { display: flex; align-items: center; gap: 0.5rem; }
.timeline-step p { margin: 0.35rem 0 0; font-size: 0.88rem; color: var(--text-muted); }

.step-status {
  font-size: 0.72rem;
  color: #fff;
  border-radius: 999px;
  padding: 0.12rem 0.5rem;
  text-transform: uppercase;
  font-weight: 600;
}

.step-success { background: #15803d; }
.step-running { background: #0369a1; }
.step-alert { background: #b45309; }
.step-error { background: #b91c1c; }
.step-skipped { background: #64748b; }
.step-pending { background: #94a3b8; }

.pipeline-log-list { margin: 0; padding-left: 1.2rem; }
.pipeline-log-list li {
  margin-bottom: 0.2rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
}

.interaction-priority {
  background: #f0f9ff;
  border-top: 2px solid #0284c7;
  border-radius: var(--radius);
  padding: 0.9rem;
}

.interactive-grid { display: grid; gap: 0.6rem; margin-top: 0.5rem; }

.interactive-answer-card {
  border: 1px solid #bae6fd;
  border-radius: var(--radius);
  padding: 0.7rem;
  background: #fff;
}

.interactive-answer-card h4 { margin: 0 0 0.4rem; }
.interactive-answer-card p { margin: 0.25rem 0; }
.interactive-question { color: #0c4a6e; }

.history-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.history-table th, .history-table td {
  border-bottom: 1px solid var(--border);
  padding: 0.5rem;
  text-align: left;
}

.compact-table th, .compact-table td { font-size: 0.84rem; padding: 0.4rem; }

.download-link {
  color: var(--primary-dark);
  font-weight: 600;
  text-decoration: none;
}
.download-link:hover { text-decoration: underline; }

/* ── FOOTER ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.site-footer p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-light);
}

.site-footer a {
  color: var(--primary);
  text-decoration: none;
}

.site-footer a:hover { text-decoration: underline; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-menu-btn { display: flex; }
  .mobile-menu:not(.hidden) { display: flex; }

  .hero { padding: 3rem 1.5rem 2.5rem; }
  .hero-title { font-size: 1.8rem; }
  .funnel-grid { grid-template-columns: 1fr; }
  .inline-row { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: 1fr; }
}