/* ========================================
   LocalCN Trip - Optimized Stylesheet
   Implements: Theme toggle, Responsive design, Accessibility (WCAG 2.1 AA), CTA optimization
   ======================================== */

/* ========================================
   CSS Design Tokens (from optimization plan)
   ======================================== */

:root {
  /* Font families */
  --font-sans: 'Open Sans', system-ui, -apple-system, sans-serif;
  --font-serif: 'Noto Sans SC', 'Georgia', serif;
  --font-mono: 'SF Mono', Monaco, 'Courier New', monospace;
  
  /* Spacing system (8px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  
  /* Typography scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  
  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.15);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
}

/* ========================================
   Light Theme (Default)
   ======================================== */

:root {
  /* Background colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  
  /* Text colors */
  --text-primary: #1a1a1a;
  --text-secondary: #333333;
  --text-tertiary: #555555;
  --text-inverse: #ffffff;
  
  /* Brand colors */
  --color-brand-primary: #E53935;
  --color-brand-primary-hover: #c62828;
  --color-brand-secondary: #FF8F00;
  --color-brand-accent: #1E88E5;
  
  /* Semantic colors */
  --color-success: #28a745;
  --color-warning: #ffc107;
  --color-danger: #dc3545;
  --color-info: #17a2b8;
  
  /* Border colors */
  --border-primary: #dee2e6;
  --border-secondary: #ced4da;
  
  /* Navbar */
  --navbar-bg: rgba(255,255,255,0.95);
  --navbar-scrolled-bg: rgba(255,255,255,0.98);
}

/* ========================================
   Dark Theme
   ======================================== */

[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-tertiary: #3d3d3d;
  
  --text-primary: #ffffff;
  --text-secondary: #e0e0e0;
  --text-tertiary: #adb5bd;
  --text-inverse: #1a1a1a;
  
  --color-brand-primary-hover: #ef5350;

  --border-primary: #404040;
  --border-secondary: #4a4a4a;
  
  --navbar-bg: rgba(26,26,26,0.95);
  --navbar-scrolled-bg: rgba(26,26,26,0.98);
  
  /* Adjust shadows for dark mode */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.4), 0 0 30px rgba(229, 57, 53, 0.06);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.5), 0 0 40px rgba(229, 57, 53, 0.08);
}

/* ========================================
   System Theme (follows OS preference)
   ======================================== */

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3d3d3d;
    
    --text-primary: #ffffff;
    --text-secondary: #e0e0e0;
    --text-tertiary: #adb5bd;
    --text-inverse: #1a1a1a;
    
    --border-primary: #404040;
    --border-secondary: #4a4a4a;
    
    --navbar-bg: rgba(26,26,26,0.95);
    --navbar-scrolled-bg: rgba(26,26,26,0.98);
    
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.3);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.4);
  }
}

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

*,
*::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);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

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

a {
  color: #64B5F6;
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-brand-primary-hover);
  text-decoration: underline;
}

a:focus-visible {
  outline: 3px solid var(--color-brand-primary);
  outline-offset: 2px;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

/* ========================================
   Accessibility - Screen Reader Only
   ======================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

/* ========================================
   Skip Navigation Link (Accessibility)
   ======================================== */

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-brand-primary);
  color: white;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  text-decoration: none;
  z-index: 10000;
  transition: top var(--transition-base);
}

.skip-link:focus {
  top: var(--space-4);
  outline: 3px solid white;
  outline-offset: 2px;
}

/* ========================================
   Focus Styles (WCAG 2.1 AA)
   ======================================== */

:focus {
  outline: 3px solid var(--color-brand-primary);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 3px solid var(--color-brand-primary);
  outline-offset: 2px;
}

/* ========================================
   High Contrast Mode Support
   ======================================== */

@media (prefers-contrast: high) {
  :root {
    --border-primary: #000000;
    --text-primary: #000000;
    --text-secondary: #333333;
  }
  
  [data-theme="dark"] {
    --border-primary: #ffffff;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
  }
  
  a {
    text-decoration: underline;
  }
}

/* ========================================
   Reduced Motion (Accessibility)
   ======================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  z-index: 1000;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-primary);
  transition: all var(--transition-slow);
}

.navbar.scrolled {
  background: var(--navbar-scrolled-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  max-width: 1200px;
  margin: 0 auto;
  gap: var(--space-4);
}

.navbar__logo {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-brand-primary);
  text-decoration: none;
  white-space: nowrap;
}

.navbar__logo:hover {
  text-decoration: none;
  color: var(--color-brand-primary-hover);
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.navbar__link {
  color: var(--text-secondary);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.navbar__link:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
  text-decoration: none;
}

.navbar__link[aria-current="page"] {
  color: var(--color-brand-primary);
  font-weight: 600;
  border-bottom: 2px solid var(--color-brand-primary);
  padding-bottom: 2px;
}

/* Mobile Menu Toggle */
.navbar__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  z-index: 1001;
}

.navbar__toggle-icon {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  position: relative;
  transition: all var(--transition-base);
}

.navbar__toggle-icon::before,
.navbar__toggle-icon::after {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  position: absolute;
  left: 0;
  transition: all var(--transition-base);
}

.navbar__toggle-icon::before {
  top: -6px;
}

.navbar__toggle-icon::after {
  top: 6px;
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-icon {
  background: transparent;
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ========================================
   Theme Toggle (Task #1)
   ======================================== */

.theme-toggle {
  display: inline-flex;
  align-items: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-full);
  padding: var(--space-1);
  gap: var(--space-1);
}

.theme-toggle__option {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  padding: 0;
}

.theme-toggle__option:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.theme-toggle__option[aria-checked="true"] {
  color: var(--text-inverse);
  background: var(--color-brand-primary);
}

.theme-toggle__option svg {
  width: 16px;
  height: 16px;
  pointer-events: none;
}

/* ========================================
   Buttons (Task #7 - CTA Optimization)
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  min-height: 44px; /* Touch-friendly (WCAG/ADA) */
  line-height: 1.5;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-brand-primary);
  color: var(--text-inverse);
  border-color: var(--color-brand-primary);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  background: var(--color-brand-primary-hover);
  border-color: var(--color-brand-primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: var(--text-inverse);
}

.btn--secondary {
  background: transparent;
  color: var(--color-brand-primary);
  border-color: var(--color-brand-primary);
}

.btn--secondary:hover {
  background: var(--color-brand-primary);
  color: var(--text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}

.btn--small {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  min-height: 36px;
}

.btn--large {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

.btn--full {
  width: 100%;
}

.btn:focus-visible {
  outline: 3px solid var(--color-brand-primary);
  outline-offset: 2px;
}

.btn:active {
  transform: translateY(0);
}

/* ========================================
   Container
   ======================================== */

.container {
  width: 100%;
  padding: var(--space-4);
  margin: 0 auto;
}

.container--narrow {
  max-width: 640px;
}

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

.hero {
  padding-top: calc(80px + var(--space-16));
  padding-bottom: var(--space-16);
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero__content {
  max-width: 600px;
}

.hero__title {
  font-size: var(--text-4xl);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-4);
}

.text-accent {
  color: var(--color-brand-primary);
}

.hero__subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  line-height: 1.6;
}

/* CTA Group (Task #7) */
.hero__cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

/* Social Proof (Task #7) */
.hero__social-proof {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.social-proof__avatars {
  display: flex;
  align-items: center;
}

.social-proof__avatars img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-primary);
  margin-left: -8px;
}

.social-proof__avatars img:first-child {
  margin-left: 0;
}

.social-proof__text {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin: 0;
}

.social-proof__rating {
  color: var(--color-brand-secondary);
  letter-spacing: 2px;
}

/* ========================================
   Section Styles
   ======================================== */

.section {
  padding: var(--space-16) 0;
}

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

.section__title {
  font-size: var(--text-3xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-2);
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: var(--space-8);
}

.section__cta {
  text-align: center;
  margin-top: var(--space-8);
}

/* ========================================
   Card Component
   ======================================== */

.card {
  background: #1e1e1e;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(229, 57, 53, 0.15);
  border-color: rgba(229, 57, 53, 0.5);
}

.card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}

.card__body {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card__title {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.card__description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-4);
  flex: 1;
}

.card__link {
  font-weight: 600;
  color: var(--color-brand-primary);
  margin-top: auto;
}

.card__link:hover {
  text-decoration: underline;
}

/* ========================================
   Destinations Grid (Task #2 - Responsive)
   ======================================== */

.destinations-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

/* ========================================
   Features Grid
   ======================================== */

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.feature {
  text-align: center;
  padding: var(--space-6);
}

.feature__icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
}

.feature__title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.feature__description {
  color: var(--text-secondary);
  font-size: var(--text-base);
  line-height: 1.6;
}

/* ========================================
   Newsletter CTA (Task #7)
   ======================================== */

.newsletter-cta {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
}

.newsletter-cta__title {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.newsletter-cta__description {
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
  font-size: var(--text-base);
}

.newsletter-cta__form {
  max-width: 480px;
  margin: 0 auto;
}

.form__group {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.form__input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  border: 2px solid var(--border-primary);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 44px;
  transition: border-color var(--transition-fast);
}

.form__input:focus {
  outline: none;
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 0 3px rgba(229, 57, 53, 0.1);
}

.form__input::placeholder {
  color: var(--text-tertiary);
}

.form__disclaimer {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  margin: 0;
}

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

.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-primary);
  padding: var(--space-16) 0 var(--space-8);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

.footer__title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-brand-primary);
  margin-bottom: var(--space-2);
}

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

.footer__heading {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.footer__links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer__links li {
  margin-bottom: var(--space-2);
}

.footer__links a {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-primary);
  text-align: center;
  color: var(--text-tertiary);
  font-size: var(--text-sm);
}

/* ========================================
   Responsive Breakpoints (Task #2)
   Mobile First Approach
   ======================================== */

/* Small screens (≥ 640px) */
@media (min-width: 640px) {
  .container {
    padding: var(--space-6);
  }
  
  .destinations-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Tablet (≥ 768px) */
@media (min-width: 768px) {
  .container {
    max-width: 720px;
    margin: 0 auto;
    padding: var(--space-8);
  }
  
  .hero__title {
    font-size: var(--text-4xl);
  }
  
  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Desktop (≥ 1024px) */
@media (min-width: 1024px) {
  .container {
    max-width: 960px;
  }
  
  .hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    align-items: center;
  }
  
  .hero__image {
    order: 2;
  }
  
  .hero__content {
    order: 1;
  }
  
  .destinations-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .footer__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Large screens (≥ 1280px) */
@media (min-width: 1280px) {
  .container {
    max-width: 1200px;
  }
  
  .destinations-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ========================================
   Mobile Navigation (Task #2)
   ======================================== */

@media (max-width: 767px) {
  .navbar__toggle {
    display: block;
  }
  
  .navbar__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-primary);
    padding: var(--space-4);
    flex-direction: column;
    box-shadow: var(--shadow-lg);
  }
  
  .navbar__links.active {
    display: flex;
  }
  
  .navbar__link {
    padding: var(--space-3) var(--space-4);
    width: 100%;
    border-bottom: 1px solid var(--border-primary);
  }
  
  .navbar__link:last-child {
    border-bottom: none;
  }
  
  .theme-toggle {
    margin-left: auto;
  }
  
  .hero__title {
    font-size: var(--text-3xl);
  }
  
  .hero__cta-group {
    flex-direction: column;
  }
  
  .hero__cta-group .btn {
    width: 100%;
    justify-content: center;
  }
  
  .form__group {
    flex-direction: column;
  }
}

/* ========================================
   Touch Optimization (Task #2)
   ======================================== */

@media (pointer: coarse) {
  .btn,
  .navbar__link,
  .card,
  input,
  select,
  textarea,
  .theme-toggle__option {
    min-height: 44px;
    min-width: 44px;
  }
  
  .destinations-grid {
    gap: var(--space-6);
  }
}

/* Disable hover on touch devices */
@media (hover: none) {
  .card:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--border-primary);
  }
  
  .btn:hover {
    transform: none;
  }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
  .navbar,
  .theme-toggle,
  .newsletter-cta,
  .skip-link {
    display: none;
  }

  body {
    color: black;
    background: white;
  }
}

/* ========================================
   P0 修复 - Hero文字可读性增强
   ======================================== */

/* Hero 标题文字阴影 - 提高光效背景下的可读性 */
.hero-title {
  text-shadow:
    0 2px 4px rgba(0, 0, 0, 0.8),
    0 4px 8px rgba(0, 0, 0, 0.5),
    0 0 40px rgba(0, 255, 255, 0.15) !important;
  -webkit-text-shadow:
    0 2px 4px rgba(0, 0, 0, 0.8),
    0 4px 8px rgba(0, 0, 0, 0.5),
    0 0 40px rgba(0, 255, 255, 0.15) !important;
}

/* Hero 副标题文字阴影 */
.hero-subtitle {
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.7) !important;
}

/* Hero 区域背景增强 */
.hero {
  position: relative;
}

/* CTA 按钮增强 - 更明显的点击欲望 */
.hero-cta,
.cta-button,
.btn-cta,
.hero a[href] {
  box-shadow:
    0 0 20px rgba(229, 57, 53, 0.4),
    0 0 40px rgba(229, 57, 53, 0.2);
  transition: all 0.3s ease !important;
}

.hero-cta:hover,
.cta-button:hover,
.btn-cta:hover,
.hero a[href]:hover {
  transform: translateY(-3px);
  box-shadow:
    0 0 30px rgba(0, 212, 255, 0.6),
    0 0 60px rgba(229, 57, 53, 0.4),
    0 10px 30px rgba(0, 0, 0, 0.3);
}

/* 图片骨架屏加载效果 */
img {
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.02) 25%,
    rgba(255, 255, 255, 0.05) 50%,
    rgba(255, 255, 255, 0.02) 75%
  );
  background-size: 200% 100%;
  transition: background 0.3s ease;
}

/* 图片加载完成后移除骨架屏 */
img[src] {
  background: transparent;
}

/* 卡片图片加载动画 */
.card img,
.content-card img,
.grid-item img {
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.03) 25%,
    rgba(255, 255, 255, 0.06) 50%,
    rgba(255, 255, 255, 0.03) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* 图片加载完成后停止动画 */
.card img[src],
.content-card img[src],
.grid-item img[src] {
  animation: none;
  background: transparent;
}

/* ========================================
   Footer Dark Mode Fix
   Ensure footer stays dark in dark mode
   ======================================== */

[data-theme="light"] .footer,
:root:not([data-theme="dark"]) .footer {
  background: #e9ecef;
  border-color: #ced4da;
}

[data-theme="dark"] footer {
  background: var(--bg-primary) !important;
  color: var(--text-secondary) !important;
}

[data-theme="dark"] footer a {
  color: rgba(245, 240, 225, 0.7) !important;
}

[data-theme="dark"] footer a:hover {
  color: var(--color-brand-primary) !important;
}

/* ===== Guangzhou Page: Attraction Cards ===== */
.attraction-card {
  background: var(--bg-secondary, #f8f6f3);
  border-radius: var(--radius-lg, 12px);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
  border-left: 4px solid var(--color-brand-primary, #E53935);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.attraction-card:hover {
  box-shadow: var(--shadow-lg, 0 10px 15px rgba(0,0,0,0.1));
  transform: translateY(-2px);
}

.attraction-card__grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 28px;
  align-items: start;
}

.attraction-card__image {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius-md, 8px);
}

.attraction-card__content {
  /* 保持原有文字样式 */
}

.attraction-card__title {
  font-family: 'Playfair Display', serif;
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.attraction-card__description {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.attraction-card__info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  background: var(--bg-primary, #fff);
  padding: var(--space-4);
  border-radius: var(--radius-md, 8px);
  margin-bottom: var(--space-4);
  font-size: 0.9rem;
}

@media only screen and (max-width: 768px) {
  .attraction-card__grid {
    grid-template-columns: 1fr;
  }
  .attraction-card__image {
    height: 200px;
  }
}

/* ===== Food Cards ===== */
.food-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.food-card {
  background: var(--bg-primary, #fff);
  border-radius: var(--radius-lg, 12px);
  overflow: hidden;
  box-shadow: var(--shadow-sm, 0 1px 3px rgba(0,0,0,0.08));
  border: 1px solid var(--border-primary, rgba(0,0,0,0.06));
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.food-card:hover {
  box-shadow: var(--shadow-md, 0 4px 12px rgba(0,0,0,0.12));
  transform: translateY(-2px);
}

.food-card__image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}

.food-card__content {
  padding: var(--space-5);
}

.food-card__title {
  font-family: 'Playfair Display', serif;
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.food-card__description {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 12px;
}

.food-card__tips {
  font-size: 0.85rem;
  color: var(--color-brand-primary, #E53935);
  padding-top: 12px;
  border-top: 1px solid var(--border-primary, rgba(0,0,0,0.06));
}

@media only screen and (max-width: 768px) {
  .food-grid {
    grid-template-columns: 1fr;
  }
  .food-card__image {
    height: 160px;
  }
}

/* ===== Itinerary Timeline Cards ===== */
.itinerary-day {
  background: var(--bg-secondary, #f8f6f3);
  border-radius: var(--radius-lg, 12px);
  padding: var(--space-8);
  margin-bottom: var(--space-8);
}

.itinerary-day__title {
  font-family: 'Playfair Display', serif;
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: var(--space-5);
  color: var(--text-primary);
  border-bottom: 2px solid var(--color-brand-primary, #E53935);
  padding-bottom: var(--space-3);
}

.itinerary-item {
  display: flex;
  gap: 16px;
  padding: var(--space-3) 0;
  border-left: 3px solid var(--color-brand-primary, #E53935);
  padding-left: var(--space-5);
  margin-bottom: var(--space-2);
}

.itinerary-item__time {
  font-weight: 700;
  color: var(--color-brand-primary, #E53935);
  min-width: 60px;
  flex-shrink: 0;
  font-size: 0.95rem;
}

.itinerary-item__content {
  color: var(--text-secondary);
  line-height: 1.6;
}

.itinerary-item__content strong {
  color: var(--text-primary);
  font-size: 1.05rem;
}

.itinerary-tips {
  background: var(--bg-primary, #fff);
  border-radius: var(--radius-lg, 12px);
  padding: var(--space-6);
  margin-top: var(--space-8);
  border: 1px solid var(--border-primary, rgba(0,0,0,0.08));
}

.itinerary-tips h4 {
  font-family: 'Playfair Display', serif;
  font-size: 1.2rem;
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

.itinerary-tips ul {
  margin: 0;
  padding-left: var(--space-5);
}

.itinerary-tips li {
  margin-bottom: var(--space-2);
  color: var(--text-secondary);
  line-height: 1.6;
}

@media only screen and (max-width: 768px) {
  .itinerary-day {
    padding: var(--space-5);
  }
  .itinerary-day__title {
    font-size: 1.2rem;
  }
  .itinerary-item {
    flex-direction: column;
    gap: 4px;
    padding-left: 16px;
  }
  .itinerary-item__time {
    min-width: auto;
  }
}

/* ========================================
   Mobile Optimization - P2 Core Web Vitals
   ======================================== */

/* 1. 触摸目标最小尺寸 (WCAG 2.1 AAA) */
@media (max-width: 767px) {
  /* 按钮和可点击元素最小尺寸 */
  button,
  a.btn,
  .btn,
  .cta-button,
  input[type="submit"],
  input[type="button"],
  .mobile-nav-toggle {
    min-height: 44px;
    min-width: 44px;
    padding: 12px 16px;
  }

  /* 导航链接 */
  .nav-links a,
  .main-nav a {
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  /* 下拉菜单项 */
  .dropdown-item {
    min-height: 44px;
    padding: 12px 16px;
  }
}

/* 2. 滚动优化 */
html {
  scroll-behavior: smooth;
  overflow-anchor: auto;
}

/* 移动端滚动优化 */
@media (max-width: 767px) {
  body {
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
  }

  /* 避免水平滚动 */
  .container,
  .main-content,
  section {
    max-width: 100vw;
    overflow-x: hidden;
  }
}

/* 3. 图片加载优化 - 防止 CLS */
img {
  background-color: var(--bg-secondary);
}

/* Hero 图片预加载提示 */
.hero-image {
  content-visibility: auto;
  contain-intrinsic-size: 1px 600px;
}

/* 4. 字体加载优化 */
@font-face {
  font-family: system-ui;
  font-display: swap;
}

/* 5. 移动端汉堡菜单优化 */
.mobile-nav-toggle {
  display: none;
}

@media (max-width: 767px) {
  .mobile-nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    cursor: pointer;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--navbar-bg);
    flex-direction: column;
    padding: 1rem;
    box-shadow: var(--shadow-lg);
  }

  .nav-links.is-active {
    display: flex;
  }

  .nav-links a {
    padding: 1rem;
    border-bottom: 1px solid var(--border-primary);
  }
}

/* 6. 减少动画（尊重用户偏好） */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* 7. 高对比度模式优化 */
@media (prefers-contrast: high) {
  :root {
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
  }
}

/* 8. 触摸设备优化 */
@media (pointer: coarse) {
  /* 增大触摸目标 */
  a, button {
    min-target-size: 44px;
  }

  /* 禁用悬停效果（无鼠标设备） */
  a:hover,
  button:hover {
    text-decoration: none;
  }
}