/* ============================================
   On My Flow — Marketing Site Styles
   Light + Minimal | Modern AI Company
   ============================================ */

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

:root {
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --primary-50: #eef2ff;
  --primary-100: #e0e7ff;
  --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;
  --white: #ffffff;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --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: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --transition: 300ms ease;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--gray-800);
  background: var(--white);
  line-height: 1.6;
  font-size: 16px;
}

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

ul {
  list-style: none;
}

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

/* --- Utilities --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 72px 0;
  border-top: 1px solid var(--gray-100);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--gray-500);
  max-width: 600px;
  line-height: 1.7;
}

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

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
  box-shadow: 0 1px 2px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--white);
  color: var(--gray-700);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--gray-50);
  border-color: var(--gray-300);
  transform: translateY(-1px);
}

.btn-large {
  padding: 16px 36px;
  font-size: 1rem;
  border-radius: var(--radius-lg);
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-100);
  transition: all var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
}

.nav-logo svg {
  width: 32px;
  height: 32px;
}

.nav-logo img {
  height: 32px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--gray-500);
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--gray-900);
}

.nav-back a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--gray-500);
  transition: color var(--transition);
  padding: 8px 0;
}

.nav-back a:hover {
  color: var(--gray-900);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-cta .btn {
  padding: 10px 22px;
  font-size: 0.875rem;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 12px;
  margin: -12px;
}

.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: all var(--transition);
}

.mobile-menu {
  display: none;
  position: absolute;
  top: 72px;
  left: 0;
  right: 0;
  background: var(--white);
  border-bottom: 1px solid var(--gray-100);
  box-shadow: var(--shadow-lg);
  padding: 24px;
}

.mobile-menu.active {
  display: block;
}

.mobile-menu a {
  display: block;
  padding: 12px 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--gray-600);
  border-bottom: 1px solid var(--gray-100);
}

.mobile-menu a:last-child {
  border-bottom: none;
}

.mobile-menu .btn {
  width: 100%;
  margin-top: 16px;
}

/* --- Hero --- */
.hero {
  padding: 160px 0 96px;
  background: linear-gradient(180deg, var(--primary-50) 0%, var(--white) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.hero-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
}

.hero h1 {
  font-size: 3.75rem;
  font-weight: 800;
  color: var(--gray-900);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, #a78bfa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--gray-500);
  line-height: 1.7;
  margin-bottom: 40px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* --- Features --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 56px;
}

.feature-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition);
}

.feature-card:hover {
  border-color: var(--primary-100);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-50);
  border-radius: var(--radius);
  margin-bottom: 20px;
  color: var(--primary);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* --- CTA Section --- */
.cta-buttons {
  margin-top: 32px;
}

/* --- How It Works --- */
.how-it-works {
  border-top: 1px solid var(--gray-100);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  margin-top: 56px;
  position: relative;
}

.steps::before {
  content: '';
  position: absolute;
  top: 40px;
  left: calc(33.33% / 2 + 32px);
  right: calc(33.33% / 2 + 32px);
  height: 2px;
  background: var(--gray-200);
}

.step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--white);
  border: 2px solid var(--primary-100);
  border-radius: 50%;
  margin: 0 auto 24px;
  position: relative;
  z-index: 1;
}

.step-number svg {
  width: 32px;
  height: 32px;
  color: var(--primary);
}

.step h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.step p {
  font-size: 0.9375rem;
  color: var(--gray-500);
  line-height: 1.6;
  max-width: 280px;
  margin: 0 auto;
}

/* --- Sub-Pages (shared) --- */
.policy-page {
  padding: 140px 0 96px;
}

.policy-content {
  max-width: 720px;
  margin: 0 auto;
}

.policy-content h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--gray-900);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.policy-updated {
  font-size: 0.875rem;
  color: var(--gray-400);
  margin-bottom: 48px;
}

.policy-content h2 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-top: 40px;
  margin-bottom: 12px;
}

.policy-content p {
  font-size: 1rem;
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: 16px;
}

.policy-content ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 16px;
}

.policy-content ul li {
  font-size: 1rem;
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: 8px;
}

.policy-content a {
  color: var(--primary);
  text-decoration: underline;
}

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

.policy-contact {
  margin-top: 48px;
  padding: 24px 32px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
}

.policy-contact h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.policy-contact p {
  margin-bottom: 4px;
}

/* --- Changelog --- */
.changelog-entry {
  margin-bottom: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--gray-200);
}

.changelog-entry:last-child {
  border-bottom: none;
}

.changelog-date {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 8px;
}

.changelog-entry h2 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 12px;
}

.changelog-entry p {
  font-size: 1rem;
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: 12px;
}

.changelog-entry ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 16px;
}

.changelog-entry ul li {
  font-size: 1rem;
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: 8px;
}

.changelog-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 999px;
  margin-right: 6px;
  margin-bottom: 8px;
}

.tag-new {
  background: #ecfdf5;
  color: #059669;
}

.tag-improved {
  background: #eff6ff;
  color: #2563eb;
}

.tag-fix {
  background: #fef3c7;
  color: #d97706;
}

/* --- Blog --- */
.blog-empty {
  text-align: center;
  padding: 64px 0;
}

.blog-empty p {
  font-size: 1.125rem;
  color: var(--gray-500);
  line-height: 1.8;
}

/* --- Footer --- */
.footer {
  padding: 64px 0 32px;
  border-top: 1px solid var(--gray-100);
}

.footer-grid {
  display: flex;
  justify-content: space-evenly;
  max-width: 720px;
  margin: 0 auto 48px;
  text-align: center;
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--gray-500);
  line-height: 1.7;
  margin-top: 12px;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gray-900);
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  font-size: 0.875rem;
  color: var(--gray-500);
  padding: 6px 0;
  transition: color var(--transition);
}

.footer-col a:hover {
  color: var(--gray-800);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid var(--gray-100);
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--gray-400);
}

.footer-socials {
  display: flex;
  gap: 16px;
}

.footer-socials a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  color: var(--gray-400);
  transition: color var(--transition);
}

.footer-socials a:hover {
  color: var(--gray-700);
}

.footer-socials svg {
  width: 20px;
  height: 20px;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .section-title {
    font-size: 2rem;
  }

  .hero h1 {
    font-size: 3rem;
  }

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

  .steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 48px 0;
  }

  .policy-page {
    padding: 120px 0 64px;
  }

  .nav-links,
  .nav-cta {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero {
    padding: 120px 0 64px;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

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

  .features-grid,
  .steps {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .steps::before {
    display: none;
  }

  .footer-grid {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
    max-width: 320px;
    margin: 0 auto;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero h1 {
    font-size: 1.875rem;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .policy-content h1 {
    font-size: 1.75rem;
  }

  .policy-contact {
    padding: 20px;
  }
}