/* ============================================================
   SightAgent Landing Page Styles
   ============================================================ */

/* --- Custom Properties --- */
:root {
  --bg: #06060a;
  --bg-surface: rgba(255, 255, 255, 0.03);
  --bg-surface-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  --text: #e4e4e7;
  --text-muted: #a1a1aa;
  --text-heading: #fafafa;
  --accent-1: #6366f1;
  --accent-2: #06b6d4;
  --gradient: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  --gradient-text: linear-gradient(135deg, #818cf8, #22d3ee);
  --radius: 12px;
  --radius-lg: 20px;
  --nav-height: 64px;
  --section-gap: 120px;
  --content-width: 1120px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 24px);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

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

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background 0.3s, border-color 0.3s, backdrop-filter 0.3s;
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(6, 6, 10, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-heading);
}

.nav-logo svg {
  width: 28px;
  height: 28px;
}

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

.nav-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text-heading); }

.nav-links .github-link {
  display: flex;
  align-items: center;
}
.nav-links .github-link svg {
  width: 20px;
  height: 20px;
  fill: var(--text-muted);
  transition: fill 0.2s;
}
.nav-links .github-link:hover svg { fill: var(--text-heading); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  border-radius: 1px;
  transition: transform 0.3s, opacity 0.3s;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
  border: none;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}
.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(99, 102, 241, 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--border-hover);
  background: var(--bg-surface);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
  border-radius: 8px;
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* --- Hero --- */
.hero {
  position: relative;
  padding: calc(var(--nav-height) + 80px) 0 100px;
  text-align: center;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.15) 0%, rgba(6, 182, 212, 0.05) 40%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero .container { position: relative; z-index: 1; }

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-heading);
  margin-bottom: 20px;
}

.hero h1 .gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 540px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.hero-badge {
  font-size: 0.8rem;
  color: var(--text-muted);
  opacity: 0.7;
}

/* --- Section shared --- */
section {
  padding: var(--section-gap) 0;
}

.section-label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 12px;
}

.section-heading {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-heading);
  line-height: 1.15;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 560px;
  line-height: 1.65;
}

/* --- Problem / Value Prop --- */
.value-prop { text-align: center; }

.value-prop .section-desc {
  margin: 0 auto 56px;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 720px;
  margin: 0 auto;
}

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: border-color 0.3s, background 0.3s;
}
.stat-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-surface-hover);
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* --- Features --- */
.features-section {
  display: flex;
  flex-direction: column;
  gap: 80px;
}

.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.feature-block.reverse .feature-visual { order: -1; }

.feature-visual {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.feature-icon {
  width: 80px;
  height: 80px;
  opacity: 0.6;
}

.feature-icon svg {
  width: 100%;
  height: 100%;
}

.feature-glow {
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.12), transparent 70%);
  pointer-events: none;
}

.feature-content .section-label { display: block; }

.feature-content .section-heading {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 16px;
}

.feature-content .section-desc {
  max-width: none;
}

/* --- How It Works --- */
.how-it-works { text-align: center; }

.how-it-works .section-desc {
  margin: 0 auto 64px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
}

.steps::before {
  content: '';
  position: absolute;
  top: 36px;
  left: calc(16.66% + 16px);
  right: calc(16.66% + 16px);
  height: 2px;
  background: var(--gradient);
  opacity: 0.3;
}

.step {
  position: relative;
  padding: 0 16px;
}

.step-number {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
  z-index: 1;
}

/* Solid bg behind the number so the connecting line doesn't show through */
.step-number::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--border);
  z-index: -1;
}

.step h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.step p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* --- Provider Presets --- */
.presets { text-align: center; }

.presets .section-desc {
  margin: 0 auto 56px;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 840px;
  margin: 0 auto;
}

.preset-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 24px;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
}
.preset-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.preset-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.preset-name {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 4px;
}

.preset-dim {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.preset-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(99, 102, 241, 0.1);
  color: #818cf8;
  border: 1px solid rgba(99, 102, 241, 0.2);
}

/* --- Privacy --- */
.privacy { text-align: center; }

.privacy .section-desc {
  margin: 0 auto 48px;
}

.privacy-points {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  max-width: 720px;
  margin: 0 auto;
}

.privacy-point {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  text-align: left;
  padding: 20px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.privacy-point svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 2px;
}

.privacy-point span {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* --- Download CTA --- */
.download-cta {
  text-align: center;
  position: relative;
  overflow: hidden;
}

.download-cta-inner {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 80px 40px;
  position: relative;
  overflow: hidden;
}

.download-cta-glow {
  position: absolute;
  bottom: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.1), transparent 70%);
  pointer-events: none;
}

.download-cta-inner .section-heading {
  position: relative;
}

.download-cta-inner .section-desc {
  margin: 0 auto 36px;
  position: relative;
}

.download-cta-inner .hero-actions {
  position: relative;
}

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

.footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-left {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--text-heading); }

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 900px) {
  :root {
    --section-gap: 80px;
  }

  .feature-block {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .feature-block.reverse .feature-visual { order: 0; }

  .feature-visual {
    aspect-ratio: 16 / 9;
    padding: 32px;
  }

  .steps { grid-template-columns: 1fr; gap: 40px; }
  .steps::before { display: none; }

  .preset-grid { grid-template-columns: 1fr; max-width: 340px; }
}

@media (max-width: 640px) {
  :root {
    --section-gap: 64px;
    --nav-height: 56px;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(6, 6, 10, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s, opacity 0.3s;
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-toggle { display: block; }

  .hero { padding: calc(var(--nav-height) + 48px) 0 64px; }

  .stats-row {
    grid-template-columns: 1fr;
    max-width: 280px;
  }

  .hero-actions { flex-direction: column; }

  .footer .container {
    flex-direction: column;
    text-align: center;
  }
}