/* ============================================
   Edge Funnel Guard — Design System
   Dark theme, tech-forward, clean.
   ============================================ */

:root {
  /* Colors */
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2234;
  --bg-code: #0d1321;
  --bg-hover: #243049;

  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-code: #a5f3fc;

  --accent: #38bdf8;
  --accent-hover: #7dd3fc;
  --accent-glow: rgba(56, 189, 248, 0.15);
  --accent-border: rgba(56, 189, 248, 0.25);

  --success: #34d399;
  --warning: #fbbf24;
  --error: #f87171;

  --border: #1e293b;
  --border-light: #334155;

  /* Typography */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;

  /* Spacing */
  --section-padding: 6rem 0;
  --container-max: 1120px;
  --radius: 8px;
  --radius-lg: 12px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover {
  color: var(--accent-hover);
}

img { max-width: 100%; }

/* ---- Container ---- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---- Nav ---- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-logo .logo-icon {
  width: 28px;
  height: 28px;
  background: var(--accent);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  color: var(--bg-primary);
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links .btn-sm {
  background: var(--accent);
  color: var(--bg-primary);
  padding: 0.4rem 1rem;
  border-radius: var(--radius);
  font-weight: 600;
}
.nav-links .btn-sm:hover {
  background: var(--accent-hover);
  color: var(--bg-primary);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ---- Hero ---- */
.hero {
  padding: 10rem 0 6rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: var(--accent-glow);
  border: 1px solid var(--accent-border);
  border-radius: 999px;
  font-size: 0.8125rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9375rem;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
}
.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--bg-primary);
  box-shadow: 0 0 30px var(--accent-glow);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}
.btn-secondary:hover {
  background: var(--bg-card);
  border-color: var(--accent-border);
}

/* ---- Section ---- */
.section {
  padding: var(--section-padding);
}

.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 3rem;
}

.section--alt {
  background: var(--bg-secondary);
}

.text-center {
  text-align: center;
}
.text-center .section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

/* ---- Problem Cards ---- */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: border-color 0.2s;
}
.problem-card:hover {
  border-color: var(--error);
}

.problem-card .icon {
  width: 44px;
  height: 44px;
  background: rgba(248, 113, 113, 0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 1.25rem;
}

.problem-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.problem-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ---- Solution Cards ---- */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.solution-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: border-color 0.2s;
}
.solution-card:hover {
  border-color: var(--accent-border);
}

.solution-card .icon {
  width: 44px;
  height: 44px;
  background: var(--accent-glow);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 1.25rem;
}

.solution-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.solution-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ---- How it Works ---- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  position: relative;
}

.steps::before {
  content: "";
  position: absolute;
  top: 36px;
  left: calc(33.33% / 2);
  right: calc(33.33% / 2);
  height: 2px;
  background: var(--border-light);
}

.step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 72px;
  height: 72px;
  background: var(--bg-card);
  border: 2px solid var(--accent-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  position: relative;
  z-index: 1;
}

.step h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.step .hop-label {
  display: inline-block;
  background: var(--accent-glow);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 0.75rem;
}

.step p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  max-width: 280px;
  margin: 0 auto;
}

/* ---- Pricing ---- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
}

.pricing-card.featured {
  border-color: var(--accent);
  position: relative;
}

.pricing-card.featured::before {
  content: "Popular";
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: var(--bg-primary);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.75rem;
  border-radius: 999px;
}

.pricing-card .tier-name {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.pricing-card .price {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.25rem;
}

.pricing-card .price-period {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.pricing-card ul {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.pricing-card li {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  padding: 0.4rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pricing-card li::before {
  content: "\2713";
  color: var(--success);
  font-weight: 700;
}

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

/* ---- Quick Start / Code ---- */
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 1rem;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.code-header .lang-badge {
  font-size: 0.6875rem;
  background: var(--accent-glow);
  color: var(--accent);
  padding: 0.1rem 0.5rem;
  border-radius: 4px;
  font-weight: 600;
}

.code-body {
  padding: 1.25rem;
  overflow-x: auto;
}

.code-body pre {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.8;
  color: var(--text-code);
}

.code-body .comment {
  color: var(--text-muted);
}
.code-body .string {
  color: var(--success);
}
.code-body .keyword {
  color: #c084fc;
}
.code-body .flag {
  color: var(--warning);
}
.code-body .url {
  color: var(--accent);
}

.quickstart-wrapper {
  max-width: 760px;
  margin: 0 auto;
}

.quickstart-step {
  margin-bottom: 2rem;
}

.quickstart-step h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.quickstart-step h3 .step-num {
  background: var(--accent);
  color: var(--bg-primary);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
}

/* ---- Footer ---- */
.footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

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

/* ---- Docs Layout ---- */
.docs-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 3rem;
  padding-top: 5rem;
  min-height: 100vh;
}

.docs-sidebar {
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 96px);
  overflow-y: auto;
  padding-bottom: 2rem;
}

.docs-sidebar h4 {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  margin-top: 1.5rem;
}
.docs-sidebar h4:first-child {
  margin-top: 0;
}

.docs-sidebar ul {
  list-style: none;
}

.docs-sidebar li a {
  display: block;
  padding: 0.3rem 0;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  transition: color 0.15s;
}
.docs-sidebar li a:hover,
.docs-sidebar li a.active {
  color: var(--accent);
}

.docs-sidebar li a .method {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  margin-right: 0.35rem;
}

.method-get { color: var(--success); }
.method-post { color: var(--accent); }

.docs-content {
  padding-bottom: 6rem;
}

.docs-content h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.docs-content > p {
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
}

.endpoint-section {
  margin-bottom: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border);
}

.endpoint-section:last-child {
  border-bottom: none;
}

.endpoint-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.endpoint-header .method-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
}

.method-badge.get {
  background: rgba(52, 211, 153, 0.12);
  color: var(--success);
}

.method-badge.post {
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent);
}

.endpoint-header .endpoint-path {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-primary);
  font-weight: 500;
}

.endpoint-section h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.endpoint-desc {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 1.5rem;
  line-height: 1.65;
}

.params-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
}

.params-table th {
  text-align: left;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border-light);
}

.params-table td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.params-table .param-name {
  font-family: var(--font-mono);
  color: var(--text-primary);
  font-weight: 500;
  white-space: nowrap;
}

.params-table .param-type {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.params-table .required {
  color: var(--error);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
}

.params-table .optional {
  color: var(--text-muted);
  font-size: 0.6875rem;
  font-weight: 600;
}

.response-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.docs-section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.docs-section-title:first-of-type {
  border-top: none;
  margin-top: 0;
  padding-top: 0;
}

.base-url-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-bottom: 2.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.base-url-box .label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 700;
  font-family: var(--font-sans);
}

.base-url-box .url {
  color: var(--accent);
}

/* ---- Copy Button ---- */
.copy-btn {
  background: none;
  border: 1px solid var(--border-light);
  color: var(--text-muted);
  font-size: 0.6875rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: all 0.15s;
}
.copy-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-border);
}
.copy-btn.copied {
  color: var(--success);
  border-color: var(--success);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.25rem;
  }

  .hero p {
    font-size: 1.0625rem;
  }

  .problem-grid,
  .solution-grid,
  .pricing-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .steps::before {
    display: none;
  }

  .docs-layout {
    grid-template-columns: 1fr;
  }

  .docs-sidebar {
    position: static;
    max-height: none;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1.5rem;
    margin-bottom: 1.5rem;
  }

  .nav-links {
    display: none;
  }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem;
    gap: 1rem;
  }
  .mobile-toggle {
    display: block;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }
  .section-title {
    font-size: 1.75rem;
  }
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  .btn {
    justify-content: center;
  }
}