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

:root {
  --bg: #0a0a0a;
  --surface: #111111;
  --surface-hover: #1a1a1a;
  --border: #1e1e1e;
  --text: #e2e8f0;
  --text-muted: #888888;
  --text-dim: #555555;
  --accent: #22c55e;
  --accent-hover: #16a34a;
  --accent-glow: rgba(34, 197, 94, 0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1000px;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ─── Header ─── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 18px;
}

.brand span {
  background: linear-gradient(135deg, var(--accent), #14b8a6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Hero ─── */
.hero {
  padding: 80px 24px 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  left: 50%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  pointer-events: none;
}

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

.hero-logo {
  margin-bottom: 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--accent), #14b8a6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 32px;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #059669);
  color: #fff;
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 30px rgba(34, 197, 94, 0.3);
}

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

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

/* ─── Meta chips ─── */
.meta-chips {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  color: var(--text-muted);
}

.chip strong {
  color: var(--text);
  font-weight: 600;
}

.chip-icon {
  font-size: 14px;
}

/* ─── Sections ─── */
.section {
  padding: 64px 24px;
}

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

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 640px;
  margin-bottom: 40px;
}

/* ─── Source-backed ─── */
.source-backed {
  padding: 0 24px;
}

.source-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0;
}

.source-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 10px;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.2);
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
}

.source-text {
  font-size: 14px;
  color: var(--text-muted);
}

.source-text a {
  color: var(--accent);
  text-decoration: none;
}

.source-text a:hover {
  text-decoration: underline;
}

/* ─── Card Grid ─── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.2s ease;
}

.card:hover {
  border-color: var(--text-dim);
}

.card-icon {
  font-size: 24px;
  margin-bottom: 12px;
}

.card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ─── Steps ─── */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
}

.step-number {
  font-size: 32px;
  font-weight: 800;
  color: rgba(34, 197, 94, 0.15);
  line-height: 1;
  margin-bottom: 12px;
}

.step h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ─── Explainer / Deep dive ─── */
.explainer-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  flex-wrap: wrap;
}

.explainer-content {
  flex: 1;
  min-width: 260px;
}

.explainer-content h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.explainer-content p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}

.explainer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--text-muted);
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
}

.read-more:hover {
  text-decoration: underline;
}

/* ─── FAQ ─── */
.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.faq-item:hover {
  border-color: var(--text-dim);
}

.faq-question {
  font-weight: 600;
  font-size: 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-toggle {
  font-size: 18px;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.faq-answer {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: 12px;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
}

/* ─── Primary Sources ─── */
.sources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.source-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease;
}

.source-card:hover {
  border-color: var(--text-dim);
}

.source-card h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.source-card p {
  font-size: 13px;
  color: var(--text-muted);
}

/* ─── Footer ─── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 24px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13px;
}

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

.footer-links a:hover {
  color: var(--text);
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 32px;
  }

  .hero p {
    font-size: 16px;
  }

  .section {
    padding: 48px 20px;
  }

  .section-title {
    font-size: 26px;
  }

  .card-grid, .steps {
    grid-template-columns: 1fr;
  }

  .header-inner {
    padding: 0 16px;
  }

  .meta-chips {
    gap: 6px;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 60px 16px 40px;
  }

  .hero h1 {
    font-size: 26px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ─── Animations ─── */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-inner {
  animation: fadeInUp 0.6s ease-out;
}

.section-inner > * {
  animation: fadeInUp 0.5s ease-out both;
}

.section-inner > *:nth-child(1) { animation-delay: 0s; }
.section-inner > *:nth-child(2) { animation-delay: 0.1s; }
.section-inner > *:nth-child(3) { animation-delay: 0.2s; }