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

html, body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: #1a1a1a;
  background: #ffffff;
  line-height: 1.6;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #ffffff;
  border-bottom: 1px solid #e5e7eb;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  color: #1f2937;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 40px;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: #6b7280;
  font-size: 15px;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-links a:hover {
  color: #1f2937;
}

.nav-links a.active {
  color: #2563eb;
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 3px;
  background: #2563eb;
  border-radius: 2px;
}

/* ===== Hero 区域 ===== */
.hero {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  padding: 80px 20px;
  text-align: center;
  animation: fadeInUp 0.8s ease;
}

.hero-inner {
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  background: #dbeafe;
  color: #1e40af;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
}

.hero-title {
  font-size: 48px;
  font-weight: 800;
  color: #0c2340;
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 20px;
  color: #475569;
  margin-bottom: 32px;
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 24px;
  margin-top: 48px;
  padding-top: 40px;
  border-top: 1px solid rgba(37, 99, 235, 0.1);
}

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

.stat-num {
  font-size: 28px;
  font-weight: 700;
  color: #2563eb;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 13px;
  color: #64748b;
}

/* ===== 功能卡片网格 ===== */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 20px;
}

.section-alt {
  background: #f8fafc;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-badge {
  display: inline-block;
  background: #dbeafe;
  color: #1e40af;
  padding: 6px 14px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  color: #0c2340;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 16px;
  color: #64748b;
  max-width: 600px;
  margin: 0 auto;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  margin-bottom: 60px;
}

.feature-card {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 32px;
  transition: all 0.3s ease;
  animation: fadeInUp 0.6s ease;
}

.feature-card:hover {
  border-color: #2563eb;
  box-shadow: 0 10px 30px rgba(37, 99, 235, 0.1);
  transform: translateY(-4px);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: #dbeafe;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  color: #2563eb;
}

.feature-title {
  font-size: 18px;
  font-weight: 700;
  color: #1f2937;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 14px;
  color: #6b7280;
  line-height: 1.6;
}

/* ===== 平台下载区 ===== */
.platform-section {
  background: #ffffff;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.platform-card {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border: 1px solid #bfdbfe;
  border-radius: 12px;
  padding: 32px 24px;
  text-align: center;
  transition: all 0.3s ease;
}

.platform-card:hover {
  border-color: #2563eb;
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.12);
}

.platform-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.platform-icon svg {
  width: 40px;
  height: 40px;
  color: #2563eb;
}

.platform-name {
  font-size: 18px;
  font-weight: 700;
  color: #1f2937;
  margin-bottom: 8px;
}

.platform-desc {
  font-size: 13px;
  color: #6b7280;
  margin-bottom: 20px;
}

.platform-note {
  font-size: 12px;
  color: #94a3b8;
  margin-top: 12px;
}

/* ===== 深度功能介绍 ===== */
.deep-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
}

.deep-feature.reverse {
  direction: rtl;
}

.deep-feature.reverse > * {
  direction: ltr;
}

.deep-content {
  padding: 20px;
}

.deep-badge {
  display: inline-block;
  background: #dbeafe;
  color: #1e40af;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
}

.deep-title {
  font-size: 28px;
  font-weight: 800;
  color: #0c2340;
  margin-bottom: 16px;
  line-height: 1.3;
}

.deep-desc {
  font-size: 15px;
  color: #475569;
  line-height: 1.8;
  margin-bottom: 24px;
}

.deep-list {
  list-style: none;
  margin-bottom: 24px;
}

.deep-list li {
  padding-left: 28px;
  margin-bottom: 12px;
  position: relative;
  font-size: 14px;
  color: #475569;
}

.deep-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #2563eb;
  font-weight: bold;
  font-size: 16px;
}

.deep-visual {
  background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
  border-radius: 12px;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #2563eb;
  font-size: 14px;
  font-weight: 600;
}

/* ===== 用户评价 ===== */
.reviews-section {
  background: #f8fafc;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.review-card {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 28px;
  transition: all 0.3s ease;
}

.review-card:hover {
  border-color: #2563eb;
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.08);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 700;
  font-size: 16px;
}

.review-info {
  flex: 1;
}

.review-name {
  font-size: 14px;
  font-weight: 700;
  color: #1f2937;
}

.review-stars {
  font-size: 12px;
  color: #f59e0b;
  margin-top: 2px;
}

.review-text {
  font-size: 14px;
  color: #6b7280;
  line-height: 1.6;
}

/* ===== 数据对比表 ===== */
.comparison-section {
  background: #ffffff;
}

.comparison-wrap {
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.comparison-table th {
  background: #f0f9ff;
  padding: 16px;
  text-align: left;
  font-weight: 700;
  color: #0c2340;
  border-bottom: 2px solid #2563eb;
}

.comparison-table td {
  padding: 16px;
  border-bottom: 1px solid #e5e7eb;
  color: #475569;
}

.comparison-table tr:hover {
  background: #f8fafc;
}

.comparison-table .highlight {
  color: #2563eb;
  font-weight: 600;
}

/* ===== FAQ 区域 ===== */
.faq-section {
  background: #f8fafc;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  margin-bottom: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: #2563eb;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
}

.faq-question {
  padding: 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: #1f2937;
  user-select: none;
  transition: color 0.3s ease;
}

.faq-item:hover .faq-question {
  color: #2563eb;
}

.faq-chevron {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease;
  color: #2563eb;
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background: #f8fafc;
}

.faq-item.open .faq-answer {
  max-height: 500px;
}

.faq-answer-content {
  padding: 0 20px 20px 20px;
  color: #6b7280;
  line-height: 1.7;
  font-size: 14px;
}

/* ===== CTA 横幅 ===== */
.cta-banner {
  background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
  color: #ffffff;
  padding: 60px 20px;
  text-align: center;
  margin: 80px 0;
}

.cta-banner-inner {
  max-width: 700px;
  margin: 0 auto;
}

.cta-title {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 12px;
}

.cta-desc {
  font-size: 16px;
  margin-bottom: 28px;
  opacity: 0.95;
}

/* ===== 下载页面特定样式 ===== */
.download-hero {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  padding: 60px 20px;
  text-align: center;
}

.download-hero-inner {
  max-width: 1000px;
  margin: 0 auto;
}

.download-title {
  font-size: 40px;
  font-weight: 800;
  color: #0c2340;
  margin-bottom: 12px;
}

.download-subtitle {
  font-size: 18px;
  color: #475569;
  margin-bottom: 40px;
}

.download-main-box {
  background: #ffffff;
  border: 2px solid #2563eb;
  border-radius: 12px;
  padding: 40px;
  margin-bottom: 40px;
  text-align: center;
}

.download-main-title {
  font-size: 24px;
  font-weight: 700;
  color: #0c2340;
  margin-bottom: 12px;
}

.download-meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin: 20px 0 28px 0;
  flex-wrap: wrap;
}

.download-meta-item {
  font-size: 13px;
  color: #6b7280;
}

.download-meta-item strong {
  color: #1f2937;
}

/* ===== 安装指南 ===== */
.guide-section {
  background: #ffffff;
}

.guide-title {
  font-size: 24px;
  font-weight: 700;
  color: #0c2340;
  margin-bottom: 32px;
}

.guide-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
}

.step-card {
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 24px;
  text-align: center;
}

.step-num {
  width: 40px;
  height: 40px;
  background: #2563eb;
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  margin: 0 auto 16px;
}

.step-title {
  font-size: 16px;
  font-weight: 700;
  color: #1f2937;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 13px;
  color: #6b7280;
  line-height: 1.5;
}

/* ===== 系统要求 ===== */
.requirements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.requirement-card {
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 24px;
}

.requirement-icon {
  width: 40px;
  height: 40px;
  background: #dbeafe;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}

.requirement-icon svg {
  width: 24px;
  height: 24px;
  color: #2563eb;
}

.requirement-title {
  font-size: 15px;
  font-weight: 700;
  color: #1f2937;
  margin-bottom: 8px;
}

.requirement-desc {
  font-size: 13px;
  color: #6b7280;
  line-height: 1.5;
}

/* ===== 版本日志 ===== */
.version-timeline {
  max-width: 600px;
  margin: 0 auto;
}

.version-item {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  position: relative;
}

.version-item:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 19px;
  top: 40px;
  width: 2px;
  height: calc(100% + 32px);
  background: #e5e7eb;
}

.version-dot {
  width: 40px;
  height: 40px;
  background: #2563eb;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
  margin-top: 2px;
}

.version-content {
  flex: 1;
}

.version-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.version-tag {
  background: #dbeafe;
  color: #1e40af;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
}

.version-date {
  font-size: 13px;
  color: #6b7280;
}

.version-desc {
  font-size: 14px;
  color: #475569;
  line-height: 1.6;
}

/* ===== 安全保障 ===== */
.security-banner {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin: 40px 0;
}

.security-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  color: #2563eb;
}

.security-content {
  flex: 1;
}

.security-title {
  font-size: 15px;
  font-weight: 700;
  color: #0c2340;
  margin-bottom: 4px;
}

.security-text {
  font-size: 13px;
  color: #475569;
  line-height: 1.6;
}

/* ===== SEO 文章页面 ===== */
.article-hero {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  padding: 60px 20px;
  text-align: center;
}

.article-hero-inner {
  max-width: 900px;
  margin: 0 auto;
}

.article-title {
  font-size: 42px;
  font-weight: 800;
  color: #0c2340;
  margin-bottom: 16px;
  line-height: 1.2;
}

.article-desc {
  font-size: 18px;
  color: #475569;
  margin-bottom: 24px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
}

.tag {
  background: #dbeafe;
  color: #1e40af;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.tag:hover {
  background: #2563eb;
  color: #ffffff;
}

.article-layout {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 20px;
}

.article-body {
  font-size: 15px;
  color: #475569;
  line-height: 1.8;
}

.article-body h2 {
  font-size: 24px;
  font-weight: 700;
  color: #0c2340;
  margin: 40px 0 20px 0;
}

.article-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: #1f2937;
  margin: 28px 0 12px 0;
}

.article-body p {
  margin-bottom: 16px;
}

.article-body ul, .article-body ol {
  margin: 16px 0 16px 24px;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body strong {
  color: #0c2340;
  font-weight: 700;
}

.inline-cta {
  background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
  border: 1px solid #2563eb;
  border-radius: 8px;
  padding: 24px;
  margin: 32px 0;
  text-align: center;
}

.inline-cta-title {
  font-size: 16px;
  font-weight: 700;
  color: #0c2340;
  margin-bottom: 8px;
}

.inline-cta-desc {
  font-size: 14px;
  color: #475569;
  margin-bottom: 16px;
}

/* ===== 按钮样式 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border: none;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  gap: 8px;
}

.btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.btn-primary {
  background: #2563eb;
  color: #ffffff;
}

.btn-primary:hover:not(:disabled) {
  background: #1e40af;
  box-shadow: 0 8px 16px rgba(37, 99, 235, 0.3);
}

.btn-outline {
  background: transparent;
  color: #2563eb;
  border: 2px solid #2563eb;
}

.btn-outline:hover:not(:disabled) {
  background: #f0f9ff;
}

.btn-white {
  background: #ffffff;
  color: #2563eb;
  border: 2px solid #ffffff;
}

.btn-white:hover:not(:disabled) {
  background: #f0f9ff;
}

.btn-lg {
  padding: 16px 40px;
  font-size: 16px;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

/* ===== 页脚 ===== */
.site-footer {
  background: #1f2937;
  color: #d1d5db;
  padding: 40px 20px;
  margin-top: 80px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.footer-brand {
  font-size: 16px;
  font-weight: 700;
  color: #f3f4f6;
  margin-bottom: 16px;
}

.security-line {
  font-size: 13px;
  margin-bottom: 12px;
  color: #9ca3af;
}

.security-line strong {
  color: #f3f4f6;
}

.footer-note {
  font-size: 12px;
  color: #6b7280;
  line-height: 1.6;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
  .navbar-inner {
    height: 56px;
  }

  .logo {
    font-size: 20px;
  }

  .nav-links {
    gap: 20px;
  }

  .nav-links a {
    font-size: 13px;
  }

  .hero-title {
    font-size: 32px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .section-title {
    font-size: 28px;
  }

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

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

  .deep-visual {
    height: 200px;
  }

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

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

  .comparison-table {
    font-size: 12px;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 12px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 24px;
  }

  .hero-subtitle {
    font-size: 14px;
  }

  .section-title {
    font-size: 22px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .feature-card {
    padding: 20px;
  }

  .guide-steps {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .nav-links {
    gap: 12px;
  }

  .nav-links a {
    font-size: 12px;
  }

  .deep-feature {
    gap: 20px;
  }
}