/* ============================================
 * SYNAPTIC Landing Page — Shared Styles
 * DG-171 MVP: Minimal landing for LS verification
 * ============================================ */

/* ── Reset & Base ── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --syn-bg-primary: #0e1117;
  --syn-bg-secondary: #161b22;
  --syn-bg-card: #1c2128;
  --syn-bg-card-hover: #21262d;
  --syn-border: #30363d;
  --syn-border-accent: #388bfd;
  --syn-text-primary: #e6edf3;
  --syn-text-secondary: #8b949e;
  --syn-text-muted: #6e7681;
  --syn-accent: #388bfd;
  --syn-accent-hover: #58a6ff;
  --syn-accent-glow: rgba(56, 139, 253, 0.15);
  --syn-success: #3fb950;
  --syn-highlight: #d2a8ff;
  --syn-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --syn-font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  --syn-max-width: 1100px;
  --syn-radius: 8px;
  --syn-radius-lg: 12px;
  --syn-transition: 200ms ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--syn-font-family);
  background-color: var(--syn-bg-primary);
  color: var(--syn-text-primary);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--syn-accent);
  text-decoration: none;
  transition: color var(--syn-transition);
}

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

img {
  max-width: 100%;
  height: auto;
}

/* ── Layout ── */
.container {
  max-width: var(--syn-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(14, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--syn-border);
  padding: 16px 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--syn-text-primary);
  text-decoration: none;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--syn-accent);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  color: #fff;
}

.header-nav {
  display: flex;
  gap: 24px;
  align-items: center;
}

.header-nav a {
  color: var(--syn-text-secondary);
  font-size: 14px;
  font-weight: 500;
}

.header-nav a:hover {
  color: var(--syn-text-primary);
}

/* ── Hero Section ── */
.hero {
  text-align: center;
  padding: 80px 0 60px;
}

.hero-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  border: 1px solid var(--syn-border);
  background: var(--syn-bg-secondary);
  color: var(--syn-text-secondary);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero h1 .accent {
  color: var(--syn-accent);
}

.hero .subtitle {
  font-size: 18px;
  color: var(--syn-text-secondary);
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--syn-radius);
  background: var(--syn-accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--syn-transition), box-shadow var(--syn-transition);
}

.hero-cta:hover {
  background: var(--syn-accent-hover);
  box-shadow: 0 0 20px var(--syn-accent-glow);
  color: #fff;
}

/* ── Features ── */
.features {
  padding: 60px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--syn-bg-card);
  border: 1px solid var(--syn-border);
  border-radius: var(--syn-radius-lg);
  padding: 28px;
  transition: border-color var(--syn-transition), background var(--syn-transition);
}

.feature-card:hover {
  border-color: var(--syn-border-accent);
  background: var(--syn-bg-card-hover);
}

.feature-icon {
  font-size: 28px;
  margin-bottom: 14px;
}

.feature-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--syn-text-secondary);
  line-height: 1.5;
}

/* ── Pricing ── */
.pricing {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.section-header p {
  color: var(--syn-text-secondary);
  font-size: 16px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  align-items: start;
}

.pricing-card {
  background: var(--syn-bg-card);
  border: 1px solid var(--syn-border);
  border-radius: var(--syn-radius-lg);
  padding: 32px;
  position: relative;
  transition: border-color var(--syn-transition);
}

.pricing-card.featured {
  border-color: var(--syn-accent);
  box-shadow: 0 0 30px var(--syn-accent-glow);
}

.pricing-card.featured::before {
  content: 'Most Popular';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--syn-accent);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 16px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 4px;
}

.pricing-card .plan-desc {
  color: var(--syn-text-secondary);
  font-size: 14px;
  margin-bottom: 20px;
}

.price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
}

.price .amount {
  font-size: 42px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.price .period {
  color: var(--syn-text-secondary);
  font-size: 15px;
}

.pricing-features {
  list-style: none;
  padding: 0;
  margin-bottom: 28px;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  font-size: 14px;
  color: var(--syn-text-secondary);
}

.pricing-features li .check {
  color: var(--syn-success);
  font-size: 16px;
  flex-shrink: 0;
}

.pricing-cta {
  display: block;
  text-align: center;
  padding: 12px;
  border-radius: var(--syn-radius);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--syn-transition);
  border: 1px solid var(--syn-border);
  color: var(--syn-text-primary);
  background: transparent;
}

.pricing-cta:hover {
  border-color: var(--syn-accent);
  color: var(--syn-accent);
}

.pricing-cta.primary {
  background: var(--syn-accent);
  border-color: var(--syn-accent);
  color: #fff;
}

.pricing-cta.primary:hover {
  background: var(--syn-accent-hover);
  box-shadow: 0 0 16px var(--syn-accent-glow);
  color: #fff;
}

/* ── How It Works ── */
.how-it-works {
  padding: 60px 0;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  counter-reset: step;
}

.step {
  text-align: center;
  padding: 24px;
}

.step::before {
  counter-increment: step;
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--syn-accent-glow);
  border: 2px solid var(--syn-accent);
  color: var(--syn-accent);
  font-weight: 700;
  font-size: 16px;
  margin: 0 auto 16px;
}

.step h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
}

.step p {
  font-size: 13px;
  color: var(--syn-text-secondary);
}

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--syn-border);
  padding: 40px 0;
  margin-top: 40px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 32px;
}

.footer-brand p {
  color: var(--syn-text-muted);
  font-size: 13px;
  margin-top: 8px;
}

.footer-links h4 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--syn-text-secondary);
  margin-bottom: 12px;
}

.footer-links ul {
  list-style: none;
  padding: 0;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  color: var(--syn-text-muted);
  font-size: 14px;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  margin-top: 32px;
  border-top: 1px solid var(--syn-border);
  color: var(--syn-text-muted);
  font-size: 13px;
}

/* ── Legal Pages ── */
.legal-page {
  padding: 60px 0;
  max-width: 780px;
  margin: 0 auto;
}

.legal-page h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 8px;
}

.legal-page .last-updated {
  color: var(--syn-text-muted);
  font-size: 14px;
  margin-bottom: 40px;
}

.legal-page h2 {
  font-size: 20px;
  font-weight: 600;
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--syn-border);
}

.legal-page h3 {
  font-size: 16px;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 12px;
}

.legal-page p {
  color: var(--syn-text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
}

.legal-page ul,
.legal-page ol {
  color: var(--syn-text-secondary);
  margin-bottom: 16px;
  padding-left: 24px;
}

.legal-page li {
  margin-bottom: 8px;
  line-height: 1.6;
}

.legal-page table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
}

.legal-page th,
.legal-page td {
  padding: 10px 14px;
  text-align: left;
  border: 1px solid var(--syn-border);
  font-size: 14px;
}

.legal-page th {
  background: var(--syn-bg-secondary);
  font-weight: 600;
  color: var(--syn-text-primary);
}

.legal-page td {
  color: var(--syn-text-secondary);
}

.legal-page strong {
  color: var(--syn-text-primary);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .hero {
    padding: 48px 0 40px;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .footer-inner {
    flex-direction: column;
    gap: 24px;
  }

  .header-nav {
    gap: 16px;
  }

  .steps {
    grid-template-columns: 1fr;
    max-width: 320px;
    margin: 0 auto;
  }
}