/* ============================================================
   AISearchStackHub — Brand Design System 2026
   "Stripe meets Mixpanel meets Anthropic"
   Light mode for public pages, dark mode for operator surfaces.
   ============================================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=DM+Mono:wght@400;500&display=swap');

/* ── Design Tokens ── */
:root {
  /* Product UI */
  --indigo: #312E81;
  --indigo-light: #4338CA;
  --indigo-lighter: #6366F1;
  --indigo-50: #EEF2FF;
  --indigo-100: #E0E7FF;
  --cyan: #06B6D4;
  --cyan-light: #22D3EE;
  --cyan-50: #ECFEFF;
  --cyan-100: #CFFAFE;

  /* Stack Network Chrome */
  --deep-blue: #0D47A1;
  --deep-blue-dark: #0A3575;
  --deep-blue-light: #1565C0;
  --trust-green: #2E7D32;
  --trust-green-light: #43A047;

  /* Neutrals */
  --white: #FFFFFF;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;

  /* Semantic */
  --success: #10B981;
  --warning: #F59E0B;
  --error: #EF4444;

  /* Gradients */
  --gradient-hero: linear-gradient(135deg, var(--indigo) 0%, var(--cyan) 100%);
  --gradient-subtle: linear-gradient(135deg, var(--indigo-50) 0%, var(--cyan-50) 100%);
  --gradient-glass: linear-gradient(135deg, rgba(49,46,129,0.05) 0%, rgba(6,182,212,0.05) 100%);
  --gradient-nav: linear-gradient(90deg, var(--deep-blue-dark) 0%, var(--deep-blue) 100%);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 25px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 50px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.04);
  --shadow-glow-indigo: 0 0 30px rgba(49,46,129,0.15);
  --shadow-glow-cyan: 0 0 30px rgba(6,182,212,0.12);

  /* Typography */
  --font-display: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --font-mono: 'DM Mono', 'SF Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;
  --space-5xl: 128px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration: 0.2s;
}

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

/* ── Base (Light Mode — public pages) ── */
body {
  font-family: var(--font-display);
  background: var(--white);
  color: var(--gray-800);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

.mono { font-family: var(--font-mono); }

a { color: inherit; text-decoration: none; }

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

/* ── Stack Network Navigation ── */
.sn-nav {
  background: var(--gradient-nav);
  padding: 0 var(--space-2xl);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}

.sn-nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sn-nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--white);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.3px;
}

.sn-nav-logo-mark {
  width: 32px;
  height: 32px;
  background: var(--gradient-hero);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.5px;
}

.sn-nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.sn-nav-link {
  color: rgba(255,255,255,0.75);
  font-size: 14px;
  font-weight: 500;
  transition: color var(--duration) var(--ease);
  text-decoration: none;
}

.sn-nav-link:hover {
  color: var(--white);
}

.sn-nav-link.active {
  color: var(--cyan-light);
}

.sn-nav-tag {
  font-size: 11px;
  font-weight: 500;
  color: var(--trust-green-light);
  background: rgba(46,125,50,0.15);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  letter-spacing: 0.3px;
}

.sn-nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: var(--cyan);
  color: var(--white);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: all var(--duration) var(--ease);
  letter-spacing: -0.2px;
}

.sn-nav-cta:hover {
  background: var(--cyan-light);
  transform: translateY(-1px);
}

/* Mobile nav */
.sn-nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  cursor: pointer;
  padding: 8px;
}

@media (max-width: 768px) {
  .sn-nav { padding: 0 var(--space-md); }
  .sn-nav-links { display: none; }
  .sn-nav-mobile-toggle { display: block; }
  .sn-nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--deep-blue);
    padding: var(--space-lg);
    gap: var(--space-md);
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }
  .sn-nav-tag { display: none; }
  .sn-nav-links.open .sn-nav-dropdown-menu {
    display: flex;
    flex-direction: column;
    position: static;
    background: rgba(255,255,255,0.07);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    box-shadow: none;
    min-width: unset;
  }
}

/* ── Dropdown nav item ── */
.sn-nav-dropdown {
  position: relative;
}

.sn-nav-dropdown-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-display);
}

.sn-nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 56px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 240px;
  z-index: 200;
  padding: var(--space-sm) 0;
  flex-direction: column;
}

.sn-nav-dropdown:hover .sn-nav-dropdown-menu,
.sn-nav-dropdown.open .sn-nav-dropdown-menu {
  display: flex;
}

.sn-nav-dropdown-item {
  display: block;
  padding: 10px var(--space-lg);
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-700);
  text-decoration: none;
  transition: background var(--duration) var(--ease), color var(--duration) var(--ease);
  white-space: nowrap;
}

.sn-nav-dropdown-item:hover {
  background: var(--indigo-50);
  color: var(--indigo-light);
}

/* ── Orange CTA variant (for $49 Report button) ── */
.sn-nav-cta-orange {
  background: #F97316;
}

.sn-nav-cta-orange:hover {
  background: #EA6D0E;
}

/* ── Stack Network Footer ── */
.sn-footer {
  background: var(--deep-blue);
  color: rgba(255,255,255,0.7);
  padding: var(--space-3xl) var(--space-2xl) var(--space-xl);
}

.sn-footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.sn-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.sn-footer-brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: var(--space-sm);
}

.sn-footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255,255,255,0.5);
  max-width: 320px;
}

.sn-footer-heading {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--trust-green-light);
  margin-bottom: var(--space-md);
}

.sn-footer-link {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  margin-bottom: var(--space-sm);
  transition: color var(--duration) var(--ease);
  text-decoration: none;
}

.sn-footer-link:hover { color: var(--white); }

.sn-footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.sn-footer-copy {
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}

.sn-footer-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255,255,255,0.35);
  letter-spacing: 0.5px;
}

@media (max-width: 768px) {
  .sn-footer { padding: var(--space-2xl) var(--space-md) var(--space-lg); }
  .sn-footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
}

@media (max-width: 480px) {
  .sn-footer-grid { grid-template-columns: 1fr; }
}

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.h-hero {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.h-section {
  font-size: clamp(28px, 3.5vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.h-card {
  font-size: 22px;
  letter-spacing: -0.01em;
}

.text-large {
  font-size: 19px;
  line-height: 1.7;
  color: var(--gray-500);
}

.text-body {
  font-size: 16px;
  line-height: 1.7;
  color: var(--gray-600);
}

.text-small {
  font-size: 14px;
  line-height: 1.6;
  color: var(--gray-500);
}

.text-caption {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--gray-400);
}

/* Gradient text */
.gradient-text {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-indigo { color: var(--indigo); }
.text-cyan { color: var(--cyan); }
.text-dim { color: var(--gray-400); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration) var(--ease);
  text-decoration: none;
  white-space: nowrap;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
  padding: 14px 28px;
  background: var(--indigo);
  color: var(--white);
  font-size: 15px;
  box-shadow: var(--shadow-md), var(--shadow-glow-indigo);
}

.btn-primary:hover {
  background: var(--indigo-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg), var(--shadow-glow-indigo);
}

.btn-accent {
  padding: 14px 28px;
  background: var(--cyan);
  color: var(--white);
  font-size: 15px;
  box-shadow: var(--shadow-md), var(--shadow-glow-cyan);
}

.btn-accent:hover {
  background: var(--cyan-light);
  transform: translateY(-1px);
}

.btn-outline {
  padding: 12px 24px;
  background: transparent;
  color: var(--indigo);
  font-size: 14px;
  border: 1.5px solid var(--gray-200);
}

.btn-outline:hover {
  border-color: var(--indigo);
  background: var(--indigo-50);
}

.btn-ghost {
  padding: 10px 20px;
  background: transparent;
  color: var(--gray-600);
  font-size: 14px;
}

.btn-ghost:hover { color: var(--indigo); background: var(--gray-50); }

.btn-lg {
  padding: 18px 36px;
  font-size: 16px;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn-arrow {
  transition: transform var(--duration) var(--ease);
}

.btn:hover .btn-arrow {
  transform: translateX(3px);
}

/* ── Cards ── */
.card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--duration) var(--ease);
}

.card:hover {
  border-color: var(--gray-300);
  box-shadow: var(--shadow-lg);
}

.card-glass {
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.4);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
}

.card-highlight {
  border-color: var(--cyan);
  box-shadow: var(--shadow-glow-cyan);
}

.card-highlight:hover {
  box-shadow: var(--shadow-lg), var(--shadow-glow-cyan);
}

/* ── Layout ── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-2xl);
}

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-2xl);
}

.section {
  padding: var(--space-4xl) 0;
}

.section-alt {
  background: var(--gray-50);
}

.section-gradient {
  background: var(--gradient-subtle);
}

/* ── Engine Badges ── */
.engine-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-700);
  transition: all var(--duration) var(--ease);
}

.engine-badge:hover {
  border-color: var(--indigo);
  color: var(--indigo);
  box-shadow: var(--shadow-sm);
}

.engine-badge-icon {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
  color: var(--white);
}

.engine-chatgpt .engine-badge-icon { background: #10A37F; }
.engine-claude .engine-badge-icon { background: #D97706; }
.engine-perplexity .engine-badge-icon { background: #1E88E5; }
.engine-gemini .engine-badge-icon { background: #8B5CF6; }
.engine-grok .engine-badge-icon { background: #000000; }
.engine-copilot .engine-badge-icon { background: #0078D4; }
.engine-mistral .engine-badge-icon { background: #F97316; }
.engine-llama .engine-badge-icon { background: #7C3AED; }
.engine-deepseek .engine-badge-icon { background: #2563EB; }

/* ── Score Indicators ── */
.score-high { color: var(--success); }
.score-mid { color: var(--warning); }
.score-low { color: var(--error); }

.score-ring {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  font-weight: 700;
  position: relative;
}

.score-ring::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  padding: 4px;
  background: var(--gradient-hero);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}

/* ── Data Viz ── */
.stat-number {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -2px;
  line-height: 1;
}

.stat-label {
  font-size: 14px;
  color: var(--gray-500);
  margin-top: 4px;
}

.progress-track {
  height: 6px;
  background: var(--gray-100);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--gradient-hero);
  transition: width 1s var(--ease);
}

/* ── Badges & Labels ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
}

.badge-indigo { background: var(--indigo-50); color: var(--indigo); }
.badge-cyan { background: var(--cyan-50); color: var(--cyan); }
.badge-success { background: rgba(16,185,129,0.1); color: var(--success); }
.badge-warning { background: rgba(245,158,11,0.1); color: var(--warning); }
.badge-error { background: rgba(239,68,68,0.1); color: var(--error); }

/* ── Citation Health Badge ── */
.citation-health-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.3px;
  border: 1px solid transparent;
}
.citation-health-badge.strong   { background: rgba(22,163,74,0.12);  color: #16a34a; border-color: rgba(22,163,74,0.3); }
.citation-health-badge.moderate { background: rgba(217,119,6,0.12);  color: #d97706; border-color: rgba(217,119,6,0.3); }
.citation-health-badge.weak    { background: rgba(220,38,38,0.12);  color: #dc2626; border-color: rgba(220,38,38,0.3); }
.citation-health-badge .badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}
.citation-health-badge.strong  .badge-dot { background: #16a34a; }
.citation-health-badge.moderate .badge-dot { background: #d97706; }
.citation-health-badge.weak  .badge-dot { background: #dc2626; }

.citation-health-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  margin-top: 12px;
  font-size: 13px;
}
.citation-health-row .ch-label { color: var(--gray-500); }
.citation-health-row .ch-score { font-weight: 700; }
.citation-health-row .ch-counts { font-size: 12px; color: var(--gray-400); }

/* ── Section Labels ── */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--indigo);
  letter-spacing: 0.5px;
  margin-bottom: var(--space-md);
}

.section-label::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--gradient-hero);
  border-radius: 1px;
}

/* ── Dot Grid Background ── */
.dot-grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--gray-200) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.5;
  pointer-events: none;
}

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

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(6,182,212,0.1); }
  50% { box-shadow: 0 0 40px rgba(6,182,212,0.2); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes countUp {
  from { opacity: 0; transform: scale(0.5); }
  to { opacity: 1; transform: scale(1); }
}

.animate-in {
  animation: fadeInUp 0.6s var(--ease) forwards;
  opacity: 0;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }

.animate-float { animation: float 3s ease-in-out infinite; }
.animate-glow { animation: pulse-glow 3s ease-in-out infinite; }

/* ── Glassmorphism ── */
.glass {
  background: rgba(255,255,255,0.65);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255,255,255,0.3);
  box-shadow: var(--shadow-lg);
}

/* ── Form Inputs ── */
.input {
  width: 100%;
  padding: 14px 18px;
  background: var(--white);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--gray-800);
  transition: all var(--duration) var(--ease);
  outline: none;
}

.input:focus {
  border-color: var(--indigo);
  box-shadow: 0 0 0 3px rgba(49,46,129,0.1);
}

.input::placeholder {
  color: var(--gray-400);
}

.input-lg {
  padding: 18px 24px;
  font-size: 17px;
  border-radius: var(--radius-lg);
}

/* ── Responsive Utilities ── */
@media (max-width: 768px) {
  .container, .container-narrow { padding: 0 var(--space-md); }
  .section { padding: var(--space-3xl) 0; }
  .hide-mobile { display: none !important; }
}

@media (max-width: 480px) {
  .h-hero { letter-spacing: -0.02em; }
}

/* ── Dark mode overrides (for dashboard/operator surfaces) ── */
.dark-mode {
  --bg-dark: #07070e;
  --surface-dark: #0e0e18;
  --surface2-dark: #13131f;
  --border-dark: #1a1a28;
  --text-dark: #e2e2ef;
  --text-dim-dark: #9090a8;

  background: var(--bg-dark);
  color: var(--text-dark);
}

.dark-mode .card {
  background: var(--surface-dark);
  border-color: var(--border-dark);
}

.dark-mode .input {
  background: var(--surface2-dark);
  border-color: var(--border-dark);
  color: var(--text-dark);
}

/* ── Scroll animations (intersection observer) ── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Separator lines ── */
.divider {
  height: 1px;
  background: var(--gray-200);
}

.divider-gradient {
  height: 2px;
  background: var(--gradient-hero);
  opacity: 0.3;
}

/* ── Ticker / marquee ── */
@keyframes ticker-scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ── Content page overrides — applied when brand-2026.css is loaded alongside Tailwind ── */
.brand-page {
  font-family: var(--font-display);
  -webkit-font-smoothing: antialiased;
}