/* ============================================================================
   ModularAuth-Kit — Website Design System
   Dark theme, Inter font, purposeful animations, minimal aesthetic.
   ============================================================================ */

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

:root {
  /* Colors */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --bg-code: #1a1a2e;

  --text-primary: #e8e8ed;
  --text-secondary: #8a8a9a;
  --text-muted: #5a5a6a;

  --accent: #6c63ff;
  --accent-light: #8b83ff;
  --accent-glow: rgba(108, 99, 255, 0.15);
  --accent-secondary: #00d4aa;
  --accent-secondary-glow: rgba(0, 212, 170, 0.15);

  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);

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

  /* Spacing */
  --section-padding: 120px 0;
  --container-width: 1120px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

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

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}

a {
  color: var(--accent-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--accent-secondary); }

img { max-width: 100%; display: block; }

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

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition-base);
}

.nav-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-logo .logo-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 800;
  color: #fff;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: color var(--transition-fast);
}
.nav-links a:hover,
.nav-links a.active { color: var(--text-primary); }

.nav-github {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all var(--transition-fast);
}
.nav-github:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: var(--bg-card);
}
.nav-github svg { width: 18px; height: 18px; }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}
.nav-toggle span {
  width: 20px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* ---------- Hero ---------- */
.hero {
  padding: 160px 0 100px;
  text-align: center;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, var(--accent-glow), transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  background: var(--bg-card);
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-secondary);
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
  position: relative;
}

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

.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

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

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-light);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

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

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

.section-label {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent-light);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.7;
}

.section-header {
  margin-bottom: 64px;
}

.section-header.center {
  text-align: center;
}
.section-header.center .section-subtitle {
  margin: 0 auto;
}

/* ---------- Feature Grid ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.feature-card {
  padding: 32px;
  background: var(--bg-secondary);
  transition: background var(--transition-base);
}
.feature-card:hover {
  background: var(--bg-card-hover);
}

.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin-bottom: 16px;
  background: var(--accent-glow);
  color: var(--accent-light);
}

.feature-icon.green {
  background: var(--accent-secondary-glow);
  color: var(--accent-secondary);
}

.feature-card h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

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

/* ---------- Code Blocks ---------- */
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
}

.code-dots {
  display: flex;
  gap: 6px;
}
.code-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
}

.code-filename {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.code-body {
  padding: 20px;
  overflow-x: auto;
}

.code-body code {
  color: var(--text-secondary);
  white-space: pre;
}

/* Syntax colors */
.code-body .kw { color: #c792ea; }   /* keywords */
.code-body .fn { color: #82aaff; }   /* functions */
.code-body .str { color: #c3e88d; }  /* strings */
.code-body .cm { color: #546e7a; }   /* comments */
.code-body .num { color: #f78c6c; }  /* numbers */
.code-body .op { color: #89ddff; }   /* operators */
.code-body .type { color: #ffcb6b; } /* types */
.code-body .prop { color: #f07178; } /* properties */

/* ---------- How It Works ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  counter-reset: step;
}

.step {
  position: relative;
  counter-increment: step;
}

.step-number {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--accent-glow);
  color: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 16px;
}

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

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

/* Connector line between steps */
.step:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 18px;
  left: calc(36px + 16px);
  right: -16px;
  height: 1px;
  background: linear-gradient(90deg, var(--border-hover), transparent);
}

/* ---------- Comparison ---------- */
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.comparison-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.comparison-label.before { color: var(--text-muted); }
.comparison-label.after { color: var(--accent-secondary); }

/* ---------- AI Integration Section ---------- */
.ai-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 64px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.ai-section h2 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.ai-section p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.ai-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ai-step {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 14px;
  color: var(--text-secondary);
}

.ai-step-num {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: var(--accent-glow);
  color: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

/* ---------- Stats ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  margin-top: 64px;
}

.stat {
  padding: 32px;
  background: var(--bg-secondary);
  text-align: center;
}

.stat-value {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 4px;
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
}

/* ---------- Compatibility ---------- */
.compat-badges {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.compat-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
}

.compat-badge .check { color: var(--accent-secondary); }
.compat-badge .cross { color: #f07178; }

/* ---------- Footer ---------- */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

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

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

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}
.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
}
.footer-links a:hover { color: var(--text-primary); }

/* ---------- Docs Page ---------- */
.docs-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 48px;
  padding-top: 100px;
  padding-bottom: 80px;
  min-height: 100vh;
}

.docs-sidebar {
  position: sticky;
  top: 88px;
  align-self: start;
  max-height: calc(100vh - 112px);
  overflow-y: auto;
}

.docs-sidebar-group {
  margin-bottom: 24px;
}

.docs-sidebar-group h4 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.docs-sidebar-group a {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}
.docs-sidebar-group a:hover,
.docs-sidebar-group a.active {
  color: var(--accent-light);
}

.docs-content {
  max-width: 720px;
}

.docs-content h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.docs-content h2 {
  font-size: 22px;
  font-weight: 600;
  margin-top: 48px;
  margin-bottom: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.docs-content h3 {
  font-size: 17px;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
}

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

.docs-content code:not(.code-body code) {
  background: var(--bg-code);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent-light);
}

.docs-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 14px;
}

.docs-content th {
  text-align: left;
  padding: 10px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-weight: 600;
  color: var(--text-primary);
  font-size: 13px;
}

.docs-content td {
  padding: 10px 16px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.docs-content .callout {
  padding: 16px 20px;
  border-radius: 8px;
  border-left: 3px solid var(--accent);
  background: var(--accent-glow);
  margin: 16px 0;
  font-size: 14px;
  color: var(--text-secondary);
}

.docs-content .callout strong {
  color: var(--text-primary);
}

/* ---------- Getting Started ---------- */
.gs-tabs {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 32px;
  width: fit-content;
}

.gs-tab {
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  background: var(--bg-secondary);
  border: none;
  font-family: var(--font);
  transition: all var(--transition-fast);
}
.gs-tab:not(:last-child) { border-right: 1px solid var(--border); }
.gs-tab.active,
.gs-tab:hover {
  background: var(--accent-glow);
  color: var(--accent-light);
}

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

/* Features page detail cards */
.feature-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 64px 0;
  border-bottom: 1px solid var(--border);
}

.feature-detail:nth-child(even) {
  direction: rtl;
}
.feature-detail:nth-child(even) > * {
  direction: ltr;
}

.feature-detail h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}

.feature-detail p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.feature-tag {
  display: inline-flex;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  background: var(--accent-glow);
  color: var(--accent-light);
  margin-right: 8px;
}

/* ---------- Animations ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.stagger > .fade-up:nth-child(1) { transition-delay: 0ms; }
.stagger > .fade-up:nth-child(2) { transition-delay: 60ms; }
.stagger > .fade-up:nth-child(3) { transition-delay: 120ms; }
.stagger > .fade-up:nth-child(4) { transition-delay: 180ms; }
.stagger > .fade-up:nth-child(5) { transition-delay: 240ms; }
.stagger > .fade-up:nth-child(6) { transition-delay: 300ms; }
.stagger > .fade-up:nth-child(7) { transition-delay: 360ms; }
.stagger > .fade-up:nth-child(8) { transition-delay: 420ms; }
.stagger > .fade-up:nth-child(9) { transition-delay: 480ms; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .comparison { grid-template-columns: 1fr; }
  .ai-section { grid-template-columns: 1fr; padding: 40px 24px; }
  .steps { grid-template-columns: 1fr; }
  .step:not(:last-child)::after { display: none; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .feature-detail { grid-template-columns: 1fr; }
  .feature-detail:nth-child(even) { direction: ltr; }
  .docs-layout { grid-template-columns: 1fr; }
  .docs-sidebar { position: static; }
}

@media (max-width: 640px) {
  .feature-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr; }
  .hero { padding: 120px 0 60px; }
  :root { --section-padding: 80px 0; }

  .nav-links { display: none; }
  .nav-toggle { display: flex; }

  .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: 16px 24px;
    gap: 16px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 16px;
  }
}