/* ============================================
   ScanFlow – Document Scanner Website
   Modern, clean, responsive design
   ============================================ */

/* --- Design Tokens --- */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-accent: #06b6d4;
  --color-accent-dark: #0891b2;
  --color-success: #10b981;
  --color-success-light: #d1fae5;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-bg: #f8fafc;
  --color-bg-alt: #ffffff;
  --color-surface: #ffffff;
  --color-surface-hover: #f1f5f9;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --gradient-hero: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
  --gradient-cta: linear-gradient(135deg, #1d4ed8 0%, #0891b2 100%);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1200px;
  --max-width-narrow: 800px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary-dark);
}

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

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

/* --- Navigation --- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: 0 24px;
}

.navbar__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: none;
}

.navbar__brand:hover {
  color: var(--color-primary);
}

.navbar__logo {
  width: 36px;
  height: 36px;
  background: var(--gradient-hero);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 1.1rem;
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.navbar__links a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.navbar__links a:hover,
.navbar__links a.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.navbar__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-text);
}

.navbar__toggle svg {
  width: 24px;
  height: 24px;
}

/* --- Hero Section --- */
.hero {
  background: var(--gradient-hero);
  color: white;
  padding: 80px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.08) 0%, transparent 50%);
  pointer-events: none;
}

.hero__inner {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  position: relative;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 1.2rem;
  opacity: 0.92;
  line-height: 1.6;
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: white;
  color: var(--color-primary-dark);
  padding: 14px 32px;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: all var(--transition);
  box-shadow: var(--shadow-lg);
}

.hero__cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  color: var(--color-primary-dark);
}

/* --- Page Header (non-home pages) --- */
.page-header {
  background: var(--gradient-hero);
  color: white;
  padding: 60px 24px 48px;
  text-align: center;
}

.page-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.page-header p {
  font-size: 1.15rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

/* --- Sections --- */
.section {
  padding: 72px 24px;
}

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

.section__header {
  text-align: center;
  margin-bottom: 48px;
}

.section__header h2 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
  color: var(--color-text);
}

.section__header p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* --- Feature Cards --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition);
  position: relative;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.feature-card__icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
  background: var(--color-primary-light);
}

.feature-card__icon--cyan {
  background: #cffafe;
}

.feature-card__icon--green {
  background: var(--color-success-light);
}

.feature-card__icon--amber {
  background: #fef3c7;
}

.feature-card__icon--rose {
  background: #ffe4e6;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.feature-card ul {
  list-style: none;
  padding: 0;
  margin-top: 16px;
}

.feature-card ul li {
  padding: 6px 0;
  color: var(--color-text-secondary);
  font-size: 0.92rem;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.5;
}

.feature-card ul li::before {
  content: '✓';
  color: var(--color-success);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

/* --- Highlight Cards (home page features) --- */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.highlight-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.highlight-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.highlight-card__emoji {
  font-size: 1.5rem;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-sm);
}

.highlight-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.highlight-card p {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* --- Privacy Checklist --- */
.privacy-checklist {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  max-width: var(--max-width-narrow);
  margin: 0 auto;
}

.checklist-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--color-success-light);
  border-radius: var(--radius-md);
  font-weight: 500;
  color: #065f46;
  font-size: 0.95rem;
}

.checklist-item svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

/* --- CTA Section --- */
.cta {
  text-align: center;
  padding: 72px 24px;
  background: var(--gradient-cta);
  color: white;
}

.cta h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.cta p {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 28px;
}

.cta__button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: white;
  color: var(--color-primary-dark);
  padding: 14px 32px;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: all var(--transition);
  box-shadow: var(--shadow-lg);
}

.cta__button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  color: var(--color-primary-dark);
}

/* --- Content (Privacy Policy, etc.) --- */
.content {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: 48px 24px;
}

.content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-primary-light);
}

.content h2:first-child {
  margin-top: 0;
}

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

.content ul {
  margin: 12px 0 20px 24px;
}

.content ul li {
  margin-bottom: 8px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

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

.content blockquote {
  background: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 20px 0;
  font-size: 0.95rem;
  color: var(--color-primary-dark);
}

.content blockquote strong {
  color: var(--color-primary-dark);
}

/* --- Tables --- */
.table-wrapper {
  overflow-x: auto;
  margin: 20px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

thead {
  background: var(--color-primary-light);
}

th {
  text-align: left;
  padding: 14px 20px;
  font-weight: 600;
  color: var(--color-primary-dark);
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

td {
  padding: 14px 20px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

tbody tr:hover {
  background: var(--color-surface-hover);
}

.table--compare td:nth-child(2) {
  color: var(--color-success);
  font-weight: 600;
}

.table--compare td:nth-child(3) {
  color: var(--color-text-muted);
}

/* --- Contact Cards --- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
  max-width: var(--max-width-narrow);
  margin: 0 auto;
}

.contact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  transition: all var(--transition);
}

.contact-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.contact-card__icon {
  width: 64px;
  height: 64px;
  background: var(--color-primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.6rem;
}

.contact-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.contact-card p,
.contact-card a {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.contact-card a {
  color: var(--color-primary);
  font-weight: 500;
}

/* --- Bug Report Box --- */
.bug-box {
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  max-width: var(--max-width-narrow);
  margin: 32px auto;
}

.bug-box h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-primary-dark);
}

.bug-box ol {
  margin-left: 20px;
}

.bug-box li {
  padding: 4px 0;
  color: var(--color-text-secondary);
  font-size: 0.92rem;
}

/* --- Page Navigation --- */
.page-nav {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.page-nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-primary);
  font-weight: 500;
  padding: 10px 20px;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  transition: all var(--transition);
  font-size: 0.92rem;
}

.page-nav a:hover {
  background: var(--color-primary);
  color: white;
}

/* --- Footer --- */
.footer {
  background: var(--color-text);
  color: var(--color-text-muted);
  padding: 40px 24px;
  text-align: center;
  font-size: 0.88rem;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

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

.footer__links a {
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer__links a:hover {
  color: white;
}

.footer__copy {
  opacity: 0.7;
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition);
  opacity: 0;
  pointer-events: none;
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .navbar__links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 16px 24px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
  }

  .navbar__links.open {
    display: flex;
  }

  .navbar__toggle {
    display: flex;
  }

  .hero {
    padding: 56px 20px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1.05rem;
  }

  .page-header {
    padding: 48px 20px 36px;
  }

  .page-header h1 {
    font-size: 1.8rem;
  }

  .section {
    padding: 48px 20px;
  }

  .section__header h2 {
    font-size: 1.5rem;
  }

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

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

  .privacy-checklist {
    grid-template-columns: 1fr;
  }

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

  .feature-card {
    padding: 24px;
  }

  table {
    font-size: 0.85rem;
  }

  th, td {
    padding: 10px 14px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .page-header h1 {
    font-size: 1.5rem;
  }

  .cta h2 {
    font-size: 1.5rem;
  }
}

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

.animate-in {
  animation: fadeInUp 0.5s ease forwards;
}

.animate-in:nth-child(2) { animation-delay: 0.1s; }
.animate-in:nth-child(3) { animation-delay: 0.2s; }
.animate-in:nth-child(4) { animation-delay: 0.3s; }
.animate-in:nth-child(5) { animation-delay: 0.4s; }
.animate-in:nth-child(6) { animation-delay: 0.5s; }
.animate-in:nth-child(7) { animation-delay: 0.6s; }
.animate-in:nth-child(8) { animation-delay: 0.7s; }