/* ============================================
   TabWife Marketing Site
   A clean, Apple-inspired design
   ============================================ */

/* CSS Variables */
:root {
  /* Colors */
  --color-bg: #ffffff;
  --color-bg-alt: #f5f5f7;
  --color-bg-dark: #1d1d1f;
  --color-text: #1d1d1f;
  --color-text-secondary: #86868b;
  --color-text-light: #ffffff;
  --color-primary: #6366f1;
  --color-primary-hover: #4f46e5;
  --color-border: #d2d2d7;
  --color-border-light: #e8e8ed;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 5rem;
  --spacing-3xl: 8rem;

  /* Effects */
  --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 -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

/* Reset & Base */
*, *::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-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

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

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

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

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-light);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: 600;
  font-size: var(--font-size-lg);
  color: var(--color-text);
}

.nav-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
}

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

.nav-links a {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.nav-cta {
  background: var(--color-primary);
  color: var(--color-text-light) !important;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-xl);
  font-weight: 500;
}

.nav-cta:hover {
  background: var(--color-primary-hover);
  color: var(--color-text-light) !important;
}

/* Hero Section */
.hero {
  position: relative;
  padding: calc(60px + var(--spacing-3xl)) 0 var(--spacing-3xl);
  text-align: center;
  overflow: hidden;
}

.hero-gradient {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 150%;
  height: 100%;
  background: radial-gradient(ellipse at center top, rgba(99, 102, 241, 0.1) 0%, transparent 60%);
  pointer-events: none;
  z-index: -1;
}

.hero-content {
  max-width: 700px;
  margin: 0 auto;
}

.hero-icon {
  width: 128px;
  height: 128px;
  margin: 0 auto var(--spacing-lg);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-xs);
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  font-size: var(--font-size-2xl);
  color: var(--color-text-secondary);
  font-weight: 500;
  margin-bottom: var(--spacing-md);
}

.hero-description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 500px;
  margin: 0 auto var(--spacing-xl);
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 500;
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-text);
  color: var(--color-text-light);
}

.btn-primary:hover {
  background: var(--color-bg-dark);
  color: var(--color-text-light);
  transform: scale(1.02);
}

.btn-secondary {
  background: var(--color-bg-alt);
  color: var(--color-text);
}

.btn-secondary:hover {
  background: var(--color-border-light);
  color: var(--color-text);
}

.btn-large {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

.btn-icon {
  width: 20px;
  height: 20px;
}

/* Section Styles */
section {
  padding: var(--spacing-3xl) 0;
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  text-align: center;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-xs);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

/* How It Works */
.how-it-works {
  background: var(--color-bg-alt);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  max-width: 900px;
  margin: 0 auto;
}

.step {
  text-align: center;
}

.step-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
}

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

.step h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.step p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.feature-card {
  background: var(--color-bg-alt);
  padding: var(--spacing-lg);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
}

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

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

.feature-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

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

/* Screenshots */
.screenshots {
  background: var(--color-bg-alt);
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

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

.browser-frame {
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border-light);
}

.browser-toolbar {
  background: linear-gradient(to bottom, #f6f6f6 0%, #e8e8e8 100%);
  padding: var(--spacing-xs) var(--spacing-sm);
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
}

.browser-buttons {
  display: flex;
  gap: 6px;
}

.browser-btn {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.browser-btn.close { background: #ff5f57; }
.browser-btn.minimize { background: #febc2e; }
.browser-btn.maximize { background: #28c840; }

.browser-title {
  flex: 1;
  text-align: center;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  font-weight: 500;
}

.browser-content {
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
}

.browser-content img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.screenshot-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  color: var(--color-text-secondary);
  padding: var(--spacing-xl);
}

.screenshot-placeholder svg {
  width: 48px;
  height: 48px;
  opacity: 0.3;
}

.screenshot-placeholder span {
  font-size: var(--font-size-sm);
  opacity: 0.5;
}

.screenshot-caption {
  margin-top: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* Download Section */
.download {
  text-align: center;
  background: linear-gradient(to bottom, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}

.download-content {
  max-width: 500px;
  margin: 0 auto;
}

.download-icon {
  width: 96px;
  height: 96px;
  margin: 0 auto var(--spacing-lg);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
}

.download h2 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.download p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

.download-note {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-md) !important;
}

/* Privacy */
.privacy-content {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
  max-width: 900px;
  margin: 0 auto;
}

.privacy-card {
  background: var(--color-bg-alt);
  padding: var(--spacing-lg);
  border-radius: var(--radius-xl);
}

.privacy-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.privacy-card p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

.privacy-summary {
  grid-column: 1 / -1;
  background: var(--color-text);
  color: var(--color-text-light);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
}

.privacy-summary h4 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
}

.privacy-summary ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.privacy-summary li {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
}

.privacy-summary li::before {
  content: '✓';
  color: #34d399;
  font-weight: bold;
}

.privacy-date {
  font-size: var(--font-size-xs);
  opacity: 0.7;
}

/* Support / FAQ */
.support {
  background: var(--color-bg-alt);
}

.faq {
  max-width: 700px;
  margin: 0 auto var(--spacing-2xl);
}

.faq-item {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-sm);
  overflow: hidden;
}

.faq-item summary {
  padding: var(--spacing-md) var(--spacing-lg);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background var(--transition-fast);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: var(--font-size-xl);
  font-weight: 300;
  color: var(--color-text-secondary);
  transition: transform var(--transition-base);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item summary:hover {
  background: var(--color-bg-alt);
}

.faq-answer {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.7;
}

.faq-answer ol, .faq-answer ul {
  margin: var(--spacing-sm) 0;
  padding-left: var(--spacing-lg);
}

.faq-answer li {
  margin-bottom: var(--spacing-xs);
}

.contact {
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  max-width: 500px;
  margin: 0 auto;
}

.contact h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
}

.contact p {
  color: var(--color-text-secondary);
}

.contact a {
  font-weight: 500;
}

/* Footer */
.footer {
  background: var(--color-text);
  color: var(--color-text-light);
  padding: var(--spacing-xl) 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: 600;
}

.footer-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-text-light);
}

.footer-meta {
  text-align: right;
}

.footer-meta p {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.5);
}

.version {
  font-size: var(--font-size-xs) !important;
}

/* Animations */
.fade-in {
  animation: fadeIn 0.6s ease forwards;
}

.fade-in-delay-1 {
  opacity: 0;
  animation: fadeIn 0.6s ease 0.1s forwards;
}

.fade-in-delay-2 {
  opacity: 0;
  animation: fadeIn 0.6s ease 0.2s forwards;
}

.fade-in-delay-3 {
  opacity: 0;
  animation: fadeIn 0.6s ease 0.3s forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Responsive Design */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .screenshot-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.5rem;
  }

  .nav-links {
    display: none;
  }

  .steps {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

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

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

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

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

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

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

  .btn {
    width: 100%;
    max-width: 300px;
  }
}

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

  section {
    padding: var(--spacing-2xl) 0;
  }

  .hero {
    padding: calc(60px + var(--spacing-2xl)) 0 var(--spacing-2xl);
  }

  .hero-icon {
    width: 96px;
    height: 96px;
  }
}

/* Print Styles */
@media print {
  .nav,
  .hero-ctas,
  .download,
  .footer {
    display: none;
  }

  section {
    padding: var(--spacing-lg) 0;
    page-break-inside: avoid;
  }
}