:root {
  --teal-50: #ecfdf5;
  --teal-100: #d1fae5;
  --teal-200: #a7f3d0;
  --teal-300: #6ee7b7;
  --teal-400: #34d399;
  --teal-500: #10b981;
  --teal-600: #059669;
  --teal-700: #047857;
  --teal-800: #065f46;
  --teal-900: #0f6e56;
  --teal-950: #022c22;

  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  --slate-950: #020617;

  --indigo-50: #eef2ff;
  --indigo-100: #e0e7ff;
  --indigo-200: #c7d2fe;
  --indigo-500: #6366f1;
  --indigo-600: #4f46e5;
  --indigo-700: #4338ca;

  --pink-500: #ec4899;
  --pink-700: #be185d;
  --amber-600: #b45309;
  --blue-600: #1d4ed8;
  --blue-700: #1e40af;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', 'Cascadia Code', monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--slate-800);
  background: var(--slate-50);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--teal-700); text-decoration: none; }
a:hover { color: var(--teal-600); text-decoration: underline; }

pre, code { font-family: var(--font-mono); }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* NAV */
.nav {
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--slate-200);
  position: sticky;
  top: 0;
  z-index: 50;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--slate-900);
  text-decoration: none;
}
.nav-brand:hover { text-decoration: none; color: var(--slate-900); }
.nav-logo {
  width: 32px;
  height: 32px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}
.nav-links a {
  color: var(--slate-600);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--teal-700); text-decoration: none; }
.nav-links a.active { color: var(--teal-700); }

.nav-badge {
  display: inline-block;
  background: var(--teal-900);
  color: white;
  font-size: 0.65rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  letter-spacing: 0.03em;
}

/* HERO */
.hero {
  padding: 80px 0 64px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(15, 110, 86, 0.06) 0%, transparent 70%);
  top: -200px;
  left: -200px;
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.04) 0%, transparent 70%);
  bottom: -150px;
  right: -100px;
  pointer-events: none;
}
.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--slate-900);
  margin-bottom: 16px;
}
.hero .tagline {
  font-size: 1.35rem;
  color: var(--slate-500);
  max-width: 560px;
  margin: 0 auto 32px;
  line-height: 1.5;
}
.hero-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.15s;
  cursor: pointer;
  border: none;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--teal-900);
  color: white;
}
.btn-primary:hover {
  background: var(--teal-800);
  color: white;
}
.btn-secondary {
  background: white;
  color: var(--slate-700);
  border: 1.5px solid var(--slate-200);
}
.btn-secondary:hover {
  border-color: var(--teal-300);
  color: var(--teal-700);
}
.btn-ghost {
  background: transparent;
  color: var(--slate-600);
  border: 1.5px solid var(--slate-200);
}
.btn-ghost:hover {
  border-color: var(--slate-300);
  color: var(--slate-800);
}

/* HERO PILLS */
.hero-pills {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.pill {
  display: inline-flex;
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 600;
  border: 1.5px solid;
}
.pill-parties { background: #eef2ff; border-color: #c7d2fe; color: #4f46e5; }
.pill-clauses { background: #eff6ff; border-color: #bfdbfe; color: #1d4ed8; }
.pill-obligations { background: #ebf5f0; border-color: #a3d9c9; color: #0f6e56; }
.pill-risks { background: #fdf2f8; border-color: #fbcfe8; color: #be185d; }
.pill-dates { background: #fffbeb; border-color: #fef3c7; color: #b45309; }
.pill-financials { background: #ecfdf5; border-color: #a7f3d0; color: #047857; }

/* SECTIONS */
.section {
  padding: 64px 0;
}
.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--slate-900);
  margin-bottom: 8px;
}
.section-subtitle {
  color: var(--slate-500);
  margin-bottom: 40px;
  max-width: 600px;
}
.section-alt { background: white; }

/* CARDS */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.card {
  background: white;
  border: 1px solid var(--slate-200);
  border-radius: 14px;
  padding: 28px;
  transition: box-shadow 0.15s, transform 0.15s;
}
.card:hover {
  box-shadow: 0 8px 25px -8px rgba(15, 23, 42, 0.08);
  transform: translateY(-2px);
}
.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 1.25rem;
}
.card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--slate-900);
}
.card p {
  font-size: 0.9rem;
  color: var(--slate-500);
  line-height: 1.55;
}

/* CODE SNIPPET */
.code-snippet {
  background: var(--slate-900);
  border-radius: 12px;
  overflow: hidden;
  margin: 24px 0;
}
.code-snippet-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.code-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.code-body {
  padding: 20px;
  overflow-x: auto;
  font-size: 0.8rem;
  line-height: 1.6;
  color: #e2e8f0;
}
.code-body .key { color: #10b981; }
.code-body .string { color: #34d399; }
.code-body .ref { color: #a78bfa; }
.code-body .bracket { color: #64748b; }
.code-body .subkey { color: #f472b6; }

/* FOOTER */
.footer {
  background: var(--slate-900);
  color: var(--slate-400);
  padding: 40px 0;
  margin-top: auto;
  font-size: 0.85rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer h4 {
  color: white;
  font-weight: 600;
  margin-bottom: 12px;
  font-size: 0.9rem;
}
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 6px; }
.footer a { color: var(--slate-400); }
.footer a:hover { color: white; }
.footer-brand { font-weight: 700; font-size: 1.1rem; color: white; margin-bottom: 4px; }

/* PAGE HEADER */
.page-header {
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--slate-200);
  margin-bottom: 40px;
}
.page-header h1 { font-size: 2rem; font-weight: 700; margin-bottom: 8px; }
.page-header p { color: var(--slate-500); max-width: 600px; }

/* VALIDATOR */
.validator-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  min-height: 500px;
}
.validator-panel {
  background: white;
  border: 1px solid var(--slate-200);
  border-radius: 14px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.validator-panel-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--slate-200);
  font-weight: 600;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--slate-50);
}
.validator-panel-body {
  flex: 1;
  padding: 0;
  display: flex;
  flex-direction: column;
}
.validator-panel-body textarea {
  flex: 1;
  border: none;
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.55;
  resize: vertical;
  min-height: 400px;
  background: transparent;
  color: var(--slate-800);
  tab-size: 2;
}
.validator-panel-body textarea:focus {
  outline: none;
}
.validator-results {
  padding: 20px;
  flex: 1;
  overflow-y: auto;
}
.result-pass {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  border-radius: 10px;
  background: #ecfdf5;
  color: #065f46;
  font-weight: 600;
}
.result-fail {
  padding: 16px 20px;
  border-radius: 10px;
  background: #fef2f2;
  color: #991b1b;
}
.result-fail h4 {
  font-size: 0.9rem;
  margin-bottom: 8px;
}
.result-fail ul {
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}
.result-fail li {
  padding: 4px 0;
  border-bottom: 1px solid rgba(153,27,27,0.08);
}
.result-empty {
  color: var(--slate-400);
  text-align: center;
  padding: 60px 20px;
}
.result-empty svg {
  margin-bottom: 16px;
  opacity: 0.3;
}
.validator-toolbar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.validator-toolbar .btn {
  padding: 6px 14px;
  font-size: 0.8rem;
}
.loading-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--slate-200);
  border-top-color: var(--teal-600);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* SCHEMA TREE */
.schema-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.tree-panel {
  background: white;
  border: 1px solid var(--slate-200);
  border-radius: 14px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  max-height: 80vh;
}
.tree-panel-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--slate-200);
  font-weight: 600;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--slate-50);
}
.tree-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 12px 0;
  font-size: 0.85rem;
}
.tree-node {
  cursor: pointer;
  user-select: none;
}
.tree-node:hover > .tree-node-label {
  background: var(--slate-100);
}
.tree-node-label {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 20px;
  transition: background 0.1s;
}
.tree-toggle {
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--slate-400);
  font-size: 0.65rem;
  flex-shrink: 0;
  transition: transform 0.15s;
}
.tree-toggle.expanded { transform: rotate(90deg); }
.tree-toggle.hidden { visibility: hidden; }
.tree-node-name {
  font-weight: 500;
  color: var(--slate-700);
}
.tree-type-badge {
  font-size: 0.65rem;
  padding: 1px 7px;
  border-radius: 999px;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.tree-type-badge.object { background: #eef2ff; color: #4f46e5; }
.tree-type-badge.array { background: #ebf5f0; color: #0f6e56; }
.tree-type-badge.string { background: #fef3c7; color: #b45309; }
.tree-type-badge.number { background: #fdf2f8; color: #be185d; }
.tree-type-badge.boolean { background: #f0f9ff; color: #0369a1; }
.tree-type-badge.const { background: var(--slate-100); color: var(--slate-500); }
.tree-type-badge.ref { background: #f5f3ff; color: #6d28d9; }
.tree-type-badge.required {
  background: #fef2f2;
  color: #dc2626;
}
.tree-required-mark {
  color: #dc2626;
  font-size: 0.7rem;
  font-weight: 700;
}
.tree-children { display: none; }
.tree-children.open { display: block; }

/* DETAIL PANEL */
.detail-panel {
  background: white;
  border: 1px solid var(--slate-200);
  border-radius: 14px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  max-height: 80vh;
}
.detail-panel-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--slate-200);
  font-weight: 600;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--slate-50);
}
.detail-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}
.detail-empty {
  color: var(--slate-400);
  text-align: center;
  padding: 60px 20px;
}
.detail-field {
  margin-bottom: 16px;
}
.detail-field-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--slate-400);
  margin-bottom: 4px;
}
.detail-field-value {
  color: var(--slate-800);
  font-size: 0.9rem;
}
.detail-field-value.code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--slate-50);
  padding: 8px 12px;
  border-radius: 6px;
  white-space: pre-wrap;
}

/* EXAMPLES TABLE */
.examples-table {
  width: 100%;
  border-collapse: collapse;
}
.examples-table th {
  text-align: left;
  padding: 12px 16px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--slate-400);
  border-bottom: 2px solid var(--slate-200);
}
.examples-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--slate-100);
  font-size: 0.9rem;
}
.examples-table tr:hover td { background: var(--slate-50); }

/* COMPARISON */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.comparison-table th {
  text-align: left;
  padding: 10px 14px;
  font-weight: 600;
  background: var(--slate-50);
  border-bottom: 2px solid var(--slate-200);
}
.comparison-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--slate-100);
}
.comparison-table .check { color: var(--teal-600); font-weight: bold; }
.comparison-table .cross { color: var(--slate-300); }

/* BADGE */
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
}
.badge-npm {
  background: #cb3837;
  color: white;
}
.badge-license { background: var(--slate-100); color: var(--slate-600); }

/* RESPONSIVE */
@media (max-width: 768px) {
  .hero h1 { font-size: 2.2rem; }
  .hero .tagline { font-size: 1.1rem; }
  .nav-links { gap: 12px; }
  .nav-links a { font-size: 0.8rem; }
  .validator-layout { grid-template-columns: 1fr; }
  .schema-layout { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
}