/* ==========================================
   CoBudget / ShareLedger Website Styles
   设计风格与 iOS 应用保持一致
   ========================================== */

/* CSS Variables - 与 iOS 应用主题色对应 */
:root {
  /* Primary Colors - 主题色 (orange) */
  --primary: #ED8109;
  --primary-light: #F9C886;
  --primary-dark: #C96D08;

  /* Semantic Colors */
  --income: #34C759;
  --expense: #FF3B30;

  /* Light Mode Colors */
  --bg-primary: #F2F2F7;
  --bg-secondary: #FFFFFF;
  --bg-tertiary: #FFFFFF;
  --text-primary: #000000;
  --text-secondary: #8E8E93;
  --text-tertiary: #C7C7CC;
  --border-color: rgba(60, 60, 67, 0.1);
  --divider: rgba(60, 60, 67, 0.1);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #000000;
    --bg-secondary: #1C1C1E;
    --bg-tertiary: #2C2C2E;
    --text-primary: #FFFFFF;
    --text-secondary: #8E8E93;
    --text-tertiary: #48484A;
    --border-color: rgba(84, 84, 88, 0.6);
    --divider: rgba(84, 84, 88, 0.6);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  }
}

/* ==========================================
   Base Styles
   ========================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'SF Pro Display', 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

/* ==========================================
   Typography
   ========================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.25;
  color: var(--text-primary);
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
}

h2 {
  font-size: 2rem;
  font-weight: 700;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
}

p {
  margin-bottom: var(--spacing-md);
}

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

.text-small {
  font-size: 0.875rem;
}

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

/* ==========================================
   Layout
   ========================================== */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
  margin-bottom: var(--spacing-sm);
}

.section-header p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ==========================================
   Navigation
   ========================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--text-primary);
}

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

.nav-links {
  display: flex;
  gap: var(--spacing-xl);
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9375rem;
  padding: var(--spacing-sm) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition-normal);
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Mobile Menu */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition-fast);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: var(--spacing-md);
    gap: 0;
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-normal);
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--divider);
  }

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

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }
}

/* ==========================================
   Buttons
   ========================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  border-color: var(--primary);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: white;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.125rem;
}

/* ==========================================
   Cards
   ========================================== */

.card {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

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

.card-header {
  margin-bottom: var(--spacing-md);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
}

.card-icon svg {
  width: 24px;
  height: 24px;
  color: white;
}

.card-icon.blue { background: #007AFF; }
.card-icon.green { background: #34C759; }
.card-icon.orange { background: #FF9500; }
.card-icon.purple { background: #AF52DE; }
.card-icon.red { background: #FF3B30; }

.card h3 {
  margin-bottom: var(--spacing-sm);
}

.card p {
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* ==========================================
   Hero Section
   ========================================== */

.hero {
  padding-top: calc(64px + var(--spacing-3xl));
  padding-bottom: var(--spacing-3xl);
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  margin-bottom: var(--spacing-md);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-2xl);
}

.hero-image {
  margin-top: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================
   Features Section
   ========================================== */

.features {
  background: var(--bg-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

/* ==========================================
   Download Section
   ========================================== */

.download {
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--bg-secondary) 100%);
}

@media (prefers-color-scheme: dark) {
  .download {
    background: linear-gradient(135deg, var(--primary) 0%, var(--bg-secondary) 100%);
  }
}

.download-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--spacing-xl);
}

.store-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background: #000;
  color: #fff;
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: transform var(--transition-fast);
}

.store-badge:hover {
  transform: scale(1.05);
  color: #fff;
}

.store-badge svg {
  width: 24px;
  height: 24px;
}

.store-badge-text {
  text-align: left;
}

.store-badge-text span {
  display: block;
  font-size: 0.75rem;
}

.store-badge-text strong {
  font-size: 1.125rem;
}

/* ==========================================
   Footer
   ========================================== */

.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.footer-section ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

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

.footer-bottom {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--divider);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

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

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

/* ==========================================
   Legal Pages (Privacy, Terms, Support)
   ========================================== */

.legal-page {
  padding-top: calc(64px + var(--spacing-2xl));
  padding-bottom: var(--spacing-3xl);
  min-height: 100vh;
}

.legal-container {
  max-width: 800px;
  margin: 0 auto;
}

.legal-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.legal-header h1 {
  margin-bottom: var(--spacing-sm);
}

.legal-content {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-sm);
}

.legal-content h2 {
  font-size: 1.5rem;
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--divider);
}

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

.legal-content h3 {
  font-size: 1.125rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

.legal-content p {
  color: var(--text-secondary);
  line-height: 1.75;
}

.legal-content ul {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

.legal-content ul li {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  position: relative;
}

.legal-content ul li::before {
  content: '•';
  position: absolute;
  left: -20px;
  color: var(--primary);
}

.legal-content a {
  color: var(--primary);
}

.legal-content .highlight-box {
  background: var(--primary-light);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin: var(--spacing-lg) 0;
}

@media (prefers-color-scheme: dark) {
  .legal-content .highlight-box {
    background: rgba(250, 159, 174, 0.15);
  }
}

/* ==========================================
   FAQ Section
   ========================================== */

.faq-item {
  border-bottom: 1px solid var(--divider);
  padding: var(--spacing-md) 0;
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-primary);
  gap: var(--spacing-md);
}

.faq-question svg {
  flex-shrink: 0;
  transition: transform var(--transition-fast);
  color: var(--text-secondary);
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal);
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding-top: var(--spacing-md);
}

.faq-answer p {
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* ==========================================
   Contact Section
   ========================================== */

.contact-box {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.contact-box svg {
  width: 48px;
  height: 48px;
  color: var(--primary);
  margin-bottom: var(--spacing-md);
}

.contact-box h3 {
  margin-bottom: var(--spacing-sm);
}

.contact-box p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.125rem;
  font-weight: 600;
}

/* ==========================================
   Animations
   ========================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.fade-in-delay-1 {
  animation-delay: 0.1s;
  opacity: 0;
}

.fade-in-delay-2 {
  animation-delay: 0.2s;
  opacity: 0;
}

.fade-in-delay-3 {
  animation-delay: 0.3s;
  opacity: 0;
}

/* ==========================================
   Utility Classes
   ========================================== */

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

/* ==========================================
   Language Selector
   ========================================== */

.language-selector {
  position: relative;
}

.language-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.language-btn:hover {
  border-color: var(--primary);
  color: var(--text-primary);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + var(--spacing-sm));
  right: 0;
  min-width: 180px;
  max-height: 320px;
  overflow-y: auto;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
  z-index: 1001;
}

.language-selector.active .lang-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  width: 100%;
  padding: var(--spacing-md);
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 0.875rem;
  color: var(--text-primary);
  transition: background var(--transition-fast);
}

.lang-option:hover {
  background: var(--bg-primary);
}

.lang-option.active {
  background: var(--primary-light);
  color: var(--primary-dark);
}

@media (prefers-color-scheme: dark) {
  .lang-option.active {
    background: rgba(250, 159, 174, 0.2);
  }
}

.lang-flag {
  font-size: 1.25rem;
}

.lang-name {
  flex: 1;
}

/* ==========================================
   Screenshots Section
   ========================================== */

.screenshots {
  background: var(--bg-primary);
}

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--spacing-lg);
}

@media (max-width: 1200px) {
  .screenshots-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .screenshots-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .screenshots-grid {
    grid-template-columns: 1fr;
  }
}

.screenshot-item {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-secondary);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.screenshot-item:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-lg);
}

.screenshot-item img {
  width: 100%;
  aspect-ratio: 9/19.5;
  object-fit: cover;
}

.screenshot-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md);
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
  color: white;
  font-size: 0.875rem;
  font-weight: 500;
  text-align: center;
}

/* ==========================================
   Navbar Right Side
   ========================================== */

.navbar-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

@media (max-width: 768px) {
  .navbar-right {
    position: fixed;
    top: 64px;
    right: 0;
    bottom: 0;
    width: 200px;
    flex-direction: column;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    z-index: 999;
  }

  .navbar-right.active {
    transform: translateX(0);
  }

  .language-selector {
    width: 100%;
  }

  .language-btn {
    width: 100%;
    justify-content: center;
  }

  .lang-dropdown {
    position: static;
    width: 100%;
    max-height: 200px;
    margin-top: var(--spacing-sm);
    transform: none;
  }
}