/* ============================================
   deepeye.app — Design System
   A TOPEYE.org project
   ============================================ */

/* --- Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&family=Lato:wght@400;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- Custom Properties --- */
:root {
  /* Colors — darker teal palette for deepeye identity */
  --color-deep: #0d1b2a;
  --color-deep-mid: #1b2d3e;
  --color-deep-light: #253d50;
  --color-teal: #1a4a5a;
  --color-teal-light: #2a7389;
  --color-orange: #f89d35;
  --color-orange-dark: #e08620;
  --color-orange-glow: rgba(248, 157, 53, 0.15);
  --color-cyan: #4ecdc4;
  --color-cyan-dim: rgba(78, 205, 196, 0.6);

  --color-text: #e0e6ed;
  --color-text-dim: #8899a6;
  --color-text-bright: #ffffff;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.15);
  --color-surface: rgba(255, 255, 255, 0.03);
  --color-surface-hover: rgba(255, 255, 255, 0.06);
  --color-glass: rgba(13, 27, 42, 0.7);

  /* Typography */
  --font-heading: 'Poppins', system-ui, sans-serif;
  --font-body: 'Lato', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 800px;
  --max-width-wide: 1400px;
  --container-padding: 1.5rem;
  --radius: 8px;
  --radius-lg: 16px;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-deep);
  overflow-x: hidden;
}

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

a {
  color: var(--color-cyan-dim);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-cyan);
}

ul {
  list-style: none;
}

/* --- Typography --- */
h1, h2, h3, h4, h5 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-text-bright);
}

h1 { font-size: 3rem; font-weight: 700; }
h2 { font-size: 2rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }

.overline {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-orange);
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

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

.text-lg {
  font-size: 1.125rem;
  line-height: 1.6;
}

.text-center {
  text-align: center;
}

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

.container--narrow {
  max-width: var(--max-width-narrow);
}

.container--wide {
  max-width: var(--max-width-wide);
}

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  background: var(--color-orange);
  color: var(--color-deep);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius);
  font-weight: 600;
  z-index: 200;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: var(--space-4);
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 27, 42, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  height: 72px;
  display: flex;
  align-items: center;
  transition: box-shadow 0.3s ease;
}

.site-header.scrolled {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text-bright);
}

.site-logo svg {
  width: 36px;
  height: 36px;
}

.site-logo .logo-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.site-logo .logo-dot {
  color: var(--color-orange);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.site-nav a {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-dim);
  letter-spacing: 0.02em;
  position: relative;
  padding: var(--space-2) 0;
  transition: color 0.2s ease;
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-orange);
  transition: width 0.3s ease;
}

.site-nav a:hover {
  color: var(--color-text-bright);
}

.site-nav a:hover::after {
  width: 100%;
}

.site-nav .btn-nav {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-6);
  background: var(--color-orange);
  color: var(--color-deep) !important;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: all 0.2s ease;
}

.site-nav .btn-nav::after {
  display: none;
}

.site-nav .btn-nav:hover {
  background: var(--color-orange-dark);
  color: var(--color-deep) !important;
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-bright);
  cursor: pointer;
  padding: var(--space-2);
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-24) var(--container-padding);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 30%, rgba(42, 115, 137, 0.15) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 70%, rgba(248, 157, 53, 0.06) 0%, transparent 40%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(to top, var(--color-deep), transparent);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero .overline {
  margin-bottom: var(--space-6);
}

.hero h1 {
  font-size: 4rem;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-6);
  letter-spacing: -0.03em;
}

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

.hero .tagline {
  font-size: 1.25rem;
  color: var(--color-text-dim);
  max-width: 600px;
  margin: 0 auto var(--space-8);
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

.hero-terminal {
  margin-top: var(--space-16);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.875rem 2rem;
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  min-height: 48px;
}

.btn-primary {
  background: var(--color-orange);
  color: var(--color-deep);
  border-color: var(--color-orange);
}

.btn-primary:hover {
  background: var(--color-orange-dark);
  border-color: var(--color-orange-dark);
  color: var(--color-deep);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(248, 157, 53, 0.3);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-bright);
  border-color: var(--color-border-hover);
}

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

/* --- Terminal Block --- */
.terminal {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-align: left;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--color-border);
}

.terminal-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-border-hover);
}

.terminal-dot:first-child { background: #ff5f57; }
.terminal-dot:nth-child(2) { background: #febc2e; }
.terminal-dot:nth-child(3) { background: #28c840; }

.terminal-body {
  padding: var(--space-6);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.8;
}

.terminal-body .prompt {
  color: var(--color-cyan);
}

.terminal-body .command {
  color: var(--color-text-bright);
}

.terminal-body .output {
  color: var(--color-text-dim);
}

.terminal-body .success {
  color: #28c840;
}

/* --- Sections --- */
.section {
  padding: var(--space-20) 0;
  position: relative;
}

.section--alt {
  background: var(--color-deep-mid);
}

.section--border {
  border-top: 1px solid var(--color-border);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-12);
}

.section-header .overline {
  margin-bottom: var(--space-3);
}

.section-header h2 {
  margin-bottom: var(--space-4);
}

.section-header p {
  color: var(--color-text-dim);
  font-size: 1.0625rem;
}

/* --- The Problem Section --- */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-6);
}

.problem-card {
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
}

.problem-card:hover {
  border-color: var(--color-border-hover);
  background: var(--color-surface-hover);
  transform: translateY(-2px);
}

.problem-card .icon {
  font-size: 2rem;
  margin-bottom: var(--space-4);
}

.problem-card h3 {
  margin-bottom: var(--space-3);
}

.problem-card p {
  color: var(--color-text-dim);
  font-size: 0.9375rem;
}

/* --- Data Source Grid --- */
.source-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
}

.source-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: all 0.2s ease;
}

.source-item:hover {
  border-color: var(--color-border-hover);
  background: var(--color-surface-hover);
}

.source-icon {
  font-size: 1.25rem;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.05);
  flex-shrink: 0;
}

.source-item .source-name {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-bright);
}

.source-item .source-type {
  font-size: 0.75rem;
  color: var(--color-text-dim);
}

/* --- Feature Cards --- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-8);
}

.feature-card {
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
}

.feature-card:hover {
  border-color: var(--color-border-hover);
  background: var(--color-surface-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.feature-card .feature-icon {
  font-size: 2rem;
  margin-bottom: var(--space-4);
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: var(--color-orange-glow);
}

.feature-card h3 {
  margin-bottom: var(--space-3);
}

.feature-card p {
  color: var(--color-text-dim);
  font-size: 0.9375rem;
  margin-bottom: var(--space-4);
}

.feature-card .feature-example {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-cyan-dim);
  padding: var(--space-3) var(--space-4);
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius);
  border-left: 2px solid var(--color-cyan);
}

/* --- Entity Card (People Graph Demo) --- */
.entity-demo {
  max-width: 500px;
  margin: var(--space-8) auto 0;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.entity-header {
  padding: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.entity-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-teal), var(--color-teal-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.entity-name {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-text-bright);
}

.entity-meta {
  font-size: 0.8125rem;
  color: var(--color-text-dim);
}

.entity-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-border);
}

.entity-stat {
  padding: var(--space-4);
  background: rgba(0, 0, 0, 0.3);
  text-align: center;
}

.entity-stat .stat-value {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-orange);
}

.entity-stat .stat-label {
  font-size: 0.75rem;
  color: var(--color-text-dim);
  margin-top: var(--space-1);
}

/* --- Privacy Section --- */
.privacy-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
}

.privacy-item {
  display: flex;
  gap: var(--space-4);
}

.privacy-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  border-radius: var(--radius);
  background: rgba(78, 205, 196, 0.1);
}

.privacy-item h4 {
  margin-bottom: var(--space-1);
}

.privacy-item p {
  font-size: 0.9375rem;
  color: var(--color-text-dim);
}

/* --- Deploy Section --- */
.deploy-tiers {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.deploy-tier {
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.deploy-tier.featured {
  border-color: var(--color-orange);
  background: var(--color-orange-glow);
}

.deploy-tier h3 {
  margin-bottom: var(--space-2);
}

.deploy-tier .tier-reqs {
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.deploy-tier ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.deploy-tier li {
  font-size: 0.9375rem;
  color: var(--color-text);
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}

.deploy-tier li::before {
  content: '›';
  color: var(--color-orange);
  font-weight: 700;
}

/* --- CTA Banner --- */
.cta-banner {
  text-align: center;
  padding: var(--space-16) var(--container-padding);
  background: linear-gradient(135deg, var(--color-teal) 0%, var(--color-deep-mid) 100%);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(248, 157, 53, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.cta-banner h2 {
  margin-bottom: var(--space-4);
}

.cta-banner p {
  color: var(--color-text-dim);
  margin-bottom: var(--space-8);
  font-size: 1.0625rem;
}

.cta-banner .hero-buttons {
  position: relative;
  z-index: 1;
}

/* --- Footer --- */
.site-footer {
  background: rgba(0, 0, 0, 0.3);
  border-top: 1px solid var(--color-border);
  padding: var(--space-12) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-brand .site-logo {
  margin-bottom: var(--space-4);
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--color-text-dim);
  max-width: 300px;
}

.footer-col h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-orange);
  margin-bottom: var(--space-4);
}

.footer-col a {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-dim);
  padding: var(--space-1) 0;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--color-text-dim);
}

.footer-bottom a {
  color: var(--color-text-dim);
}

.footer-bottom a:hover {
  color: var(--color-orange);
}

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

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

/* Staggered grid children */
.animate-ready .fade-in-up.visible:nth-child(2) { transition-delay: 80ms; }
.animate-ready .fade-in-up.visible:nth-child(3) { transition-delay: 160ms; }
.animate-ready .fade-in-up.visible:nth-child(4) { transition-delay: 240ms; }
.animate-ready .fade-in-up.visible:nth-child(5) { transition-delay: 320ms; }
.animate-ready .fade-in-up.visible:nth-child(6) { transition-delay: 400ms; }

/* --- Grid glow effect --- */
.grid-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.grid-bg::before {
  content: '';
  position: absolute;
  inset: -50%;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  transform: perspective(500px) rotateX(60deg);
  transform-origin: center top;
}

/* --- Responsive --- */
@media (max-width: 1023px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 767px) {
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.5rem; }

  .hero {
    min-height: 80vh;
    padding: var(--space-16) var(--container-padding);
  }

  .hero h1 {
    font-size: 2.5rem;
  }

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

  .section {
    padding: var(--space-12) 0;
  }

  .section-header {
    margin-bottom: var(--space-8);
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .source-grid {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
    max-width: 320px;
  }

  .site-nav {
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    background: var(--color-deep);
    border-left: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-16) var(--space-6);
    gap: var(--space-4);
    z-index: 150;
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    font-size: 1rem;
    padding: var(--space-3) 0;
  }

  .site-nav a::after {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
  }

  .deploy-tiers {
    grid-template-columns: 1fr;
  }

  .entity-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .problem-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Inference Section (What AI Sees) --- */
.inference-terminal {
  max-width: 680px;
  margin: 0 auto var(--space-12);
}

.inference-terminal .terminal-body .warning {
  color: var(--color-orange);
}

.inference-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.inference-item {
  display: flex;
  gap: var(--space-4);
}

.inference-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: var(--color-orange-glow);
  color: var(--color-orange);
}

.inference-item h4 {
  margin-bottom: var(--space-1);
}

.inference-item p {
  font-size: 0.9375rem;
  color: var(--color-text-dim);
}

.inference-bridge {
  text-align: center;
  max-width: 700px;
  margin: var(--space-12) auto 0;
  font-size: 1.0625rem;
  color: var(--color-text-dim);
  line-height: 1.7;
}

.inference-bridge strong {
  color: var(--color-orange);
  font-weight: 600;
}

@media (max-width: 767px) {
  .inference-list {
    grid-template-columns: 1fr;
  }
}

/* --- Focus States --- */
:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 2px;
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  .fade-in-up {
    opacity: 1;
    transform: none;
    transition: none;
  }

  html {
    scroll-behavior: auto;
  }
}