/* ==========================================================================
   HTML to PDF Converter - Website Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables (Color Palette & Typography)
   -------------------------------------------------------------------------- */
:root {
  /* Colors - 基于插件的蓝色主题 */
  --primary-color: #1a73e8;
  --primary-hover: #1557b0;
  --primary-light: #e8f0fe;

  --secondary-color: #34a853;
  --danger-color: #ea4335;
  --warning-color: #fbbc04;

  --text-primary: #202124;
  --text-secondary: #5f6368;
  --text-light: #80868b;

  --bg-white: #ffffff;
  --bg-gray: #f8f9fa;
  --bg-dark: #202124;

  --border-color: #dadce0;
  --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
  --shadow-md: 0 1px 3px 0 rgba(60, 64, 67, 0.3), 0 4px 8px 3px rgba(60, 64, 67, 0.15);
  --shadow-lg: 0 2px 6px 2px rgba(60, 64, 67, 0.15), 0 8px 24px 4px rgba(60, 64, 67, 0.15);

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   Typography Utilities
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* --------------------------------------------------------------------------
   Navigation Bar
   -------------------------------------------------------------------------- */
.navbar {
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

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

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
}

.navbar-brand:hover {
  text-decoration: none;
}

.navbar-brand img {
  width: 32px;
  height: 32px;
}

.navbar-nav {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.navbar-nav a {
  color: var(--text-secondary);
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s ease;
}

.navbar-nav a:hover,
.navbar-nav a.active {
  color: var(--primary-color);
  text-decoration: none;
}

.lang-switcher {
  display: inline-block;
  padding: 6px 12px;
  background-color: var(--primary-light);
  color: var(--primary-color);
  border-radius: 4px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.lang-switcher:hover {
  background-color: var(--primary-color);
  color: white;
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   Container & Layout
   -------------------------------------------------------------------------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}

.section-title p {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--bg-white) 100%);
  padding: 6rem 0;
  text-align: center;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.hero .subtitle {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-logo {
  width: 120px;
  height: 120px;
  margin-bottom: 2rem;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.btn-primary:hover {
  background-color: var(--primary-hover);
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

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

.btn-large {
  padding: 1.125rem 2.5rem;
  font-size: 1.125rem;
}

.btn-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   Feature Cards
   -------------------------------------------------------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature-card {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  transition: all 0.3s ease;
}

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

.feature-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   Steps / How-to Section
   -------------------------------------------------------------------------- */
.steps-list {
  max-width: 800px;
  margin: 2rem auto;
}

.step-item {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--bg-gray);
  border-radius: 8px;
  border-left: 4px solid var(--primary-color);
}

.step-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background-color: var(--primary-color);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 600;
}

.step-content h4 {
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
}

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

/* --------------------------------------------------------------------------
   Privacy Policy & Support Page Content
   -------------------------------------------------------------------------- */
.content-page {
  padding: 3rem 0;
}

.content-page .container {
  max-width: 900px;
}

.content-header {
  text-align: center;
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 2px solid var(--border-color);
}

.content-header h1 {
  font-size: 2.75rem;
  margin-bottom: 0.75rem;
}

.content-header .date {
  color: var(--text-light);
  font-size: 0.875rem;
}

.content-section {
  margin-bottom: 3rem;
}

.content-section h2 {
  font-size: 2rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.content-section h3 {
  font-size: 1.5rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.content-section ul,
.content-section ol {
  margin-left: 2rem;
  margin-bottom: 1rem;
}

.content-section li {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.content-section code {
  background-color: var(--bg-gray);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

/* --------------------------------------------------------------------------
   Checkmark & Cross Icons (for lists)
   -------------------------------------------------------------------------- */
.icon-check::before {
  content: "✅ ";
}

.icon-cross::before {
  content: "❌ ";
}

/* --------------------------------------------------------------------------
   FAQ Section
   -------------------------------------------------------------------------- */
.faq-list {
  max-width: 800px;
  margin: 2rem auto;
}

.faq-item {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--bg-gray);
  border-radius: 8px;
  border-left: 4px solid var(--primary-color);
}

.faq-question {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.faq-answer {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.contact-box {
  background: var(--primary-light);
  border-radius: 8px;
  padding: 2.5rem;
  text-align: center;
  margin: 3rem 0;
}

.contact-box h3 {
  margin-bottom: 1rem;
}

.contact-box p {
  margin-bottom: 1.5rem;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-color);
  padding: 1rem 2rem;
  background: white;
  border-radius: 6px;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.contact-email:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  background-color: var(--bg-dark);
  color: white;
  padding: 3rem 0 1.5rem;
  margin-top: 4rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  color: white;
  margin-bottom: 1rem;
  font-size: 1.125rem;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: #dadce0;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-section a:hover {
  color: white;
  text-decoration: none;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #9aa0a6;
  font-size: 0.875rem;
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }

  .hero .subtitle {
    font-size: 1.25rem;
  }

  .navbar-nav {
    gap: 1rem;
  }

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

  .btn-group {
    flex-direction: column;
  }

  .step-item {
    flex-direction: column;
    text-align: center;
  }

  .content-header h1 {
    font-size: 2rem;
  }

  .section-title h2 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .hero {
    padding: 3rem 0;
  }

  .section {
    padding: 2rem 0;
  }
}