/* ============================================
   WPS下载网站 - 全局样式表
   ============================================ */

/* CSS Variables */
:root {
  --primary: #2855D1;
  --primary-dark: #1A3FA8;
  --primary-light: #4A7BE8;
  --accent: #FF6B35;
  --bg-light: #F5F8FF;
  --bg-dark: #0A1628;
  --text-primary: #1A1A2E;
  --text-secondary: #5C6370;
  --success: #10B981;
  --warning: #F59E0B;
  --white: #FFFFFF;
  --shadow-sm: 0 2px 8px rgba(40, 85, 209, 0.1);
  --shadow-md: 0 4px 16px rgba(40, 85, 209, 0.15);
  --shadow-lg: 0 8px 32px rgba(40, 85, 209, 0.2);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Sans SC", "PingFang SC", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--white);
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

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

button {
  cursor: pointer;
  border: none;
  font-family: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: var(--transition);
}

.navbar.scrolled {
  height: 64px;
  box-shadow: var(--shadow-md);
}

.navbar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.navbar-brand svg {
  width: 40px;
  height: 40px;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  position: relative;
  padding: 8px 16px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
}

.nav-link:hover {
  color: var(--primary);
  background: rgba(40, 85, 209, 0.05);
}

.nav-link.active {
  color: var(--primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
}

.navbar-download {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  background: transparent;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ============================================
   按钮
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  box-shadow: 0 4px 14px rgba(40, 85, 209, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(40, 85, 209, 0.45);
}

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

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

.btn-accent {
  background: linear-gradient(135deg, var(--accent), #E55A2B);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(255, 107, 53, 0.35);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 107, 53, 0.45);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

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

/* ============================================
   Hero 区域
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  background: linear-gradient(135deg, var(--bg-light) 0%, #E8F0FE 50%, #D6E4FF 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 150%;
  background: radial-gradient(ellipse, rgba(40, 85, 209, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.hero-text h1 span {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 500px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(40, 85, 209, 0.1);
}

.stat-item h3 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

.hero-image {
  position: relative;
}

.hero-image img {
  width: 100%;
  max-width: 580px;
  margin: 0 auto;
  filter: drop-shadow(0 20px 40px rgba(40, 85, 209, 0.2));
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.hero-badge {
  position: absolute;
  background: var(--white);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  animation: pulse 2s ease-in-out infinite;
}

.hero-badge.badge-1 {
  top: 20%;
  left: -10%;
}

.hero-badge.badge-2 {
  bottom: 30%;
  right: -5%;
  animation-delay: 1s;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

/* ============================================
   Section 通用
   ============================================ */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

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

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

.section-dark {
  background: var(--bg-dark);
  color: var(--white);
}

.section-dark .section-header h2 {
  color: var(--white);
}

.section-dark .section-header p {
  color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   卡片
   ============================================ */
.card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.card-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}

.card-icon svg {
  width: 28px;
  height: 28px;
  color: var(--white);
}

.card-icon.accent {
  background: linear-gradient(135deg, var(--accent), #FF8F5C);
}

.card-icon.success {
  background: linear-gradient(135deg, var(--success), #34D399);
}

.card-icon.warning {
  background: linear-gradient(135deg, var(--warning), #FBBF24);
}

.card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* 卡片网格 */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card-grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ============================================
   产品矩阵
   ============================================ */
.product-matrix {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.product-card {
  position: relative;
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.product-card .icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  background: linear-gradient(135deg, var(--bg-light), #E8F0FE);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-card .icon svg {
  width: 40px;
  height: 40px;
  color: var(--primary);
}

.product-card h3 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.product-card p {
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.product-card .tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--bg-light);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 20px;
  margin-bottom: 16px;
}

/* ============================================
   下载页面
   ============================================ */
.download-hero {
  background: linear-gradient(135deg, var(--bg-dark), #1A2A4A);
  color: var(--white);
  padding: 120px 0 80px;
  text-align: center;
}

.download-hero h1 {
  font-size: 3rem;
  margin-bottom: 16px;
}

.download-hero p {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.8);
  max-width: 600px;
  margin: 0 auto;
}

/* 版本选择器 */
.version-selector {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.version-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.8);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: var(--transition);
}

.version-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  color: var(--white);
}

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

.version-btn svg {
  width: 20px;
  height: 20px;
}

/* 下载卡片 */
.download-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 32px;
  margin-top: -40px;
}

.download-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.download-card.featured {
  border: 2px solid var(--primary);
}

.download-card.featured::before {
  content: '推荐版本';
  position: absolute;
  top: 20px;
  right: -35px;
  background: var(--accent);
  color: var(--white);
  padding: 6px 40px;
  font-size: 0.75rem;
  font-weight: 600;
  transform: rotate(45deg);
}

.download-card h3 {
  font-size: 1.75rem;
  margin-bottom: 8px;
}

.download-card .version {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.download-card .size {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.download-card .changelog {
  text-align: left;
  margin: 24px 0;
  padding: 20px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}

.download-card .changelog h4 {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.download-card .changelog ul {
  list-style: disc;
  padding-left: 20px;
}

.download-card .changelog li {
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.download-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.md5-info {
  margin-top: 20px;
  padding: 16px;
  background: #FFF8E6;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: #B45309;
  font-family: "JetBrains Mono", monospace;
  word-break: break-all;
}

/* 系统要求 */
.system-requirements {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 60px;
}

.sys-req-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sys-req-card h4 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-size: 1rem;
}

.sys-req-card ul {
  list-style: none;
}

.sys-req-card li {
  padding: 6px 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sys-req-card li::before {
  content: '✓';
  color: var(--success);
  font-weight: bold;
}

/* ============================================
   功能页面
   ============================================ */
.feature-section {
  padding: 80px 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
  align-items: center;
}

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

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

.feature-content h3 {
  font-size: 2rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.feature-content p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.feature-list li svg {
  width: 20px;
  height: 20px;
  color: var(--success);
  flex-shrink: 0;
}

.feature-image {
  position: relative;
}

.feature-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* 功能亮点 */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.highlight-card {
  background: var(--bg-dark);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  transition: var(--transition);
}

.highlight-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.highlight-card .icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.highlight-card .icon svg {
  width: 32px;
  height: 32px;
  color: var(--white);
}

.highlight-card h4 {
  color: var(--white);
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.highlight-card p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
}

/* ============================================
   FAQ 页面
   ============================================ */
.faq-hero {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  padding: 100px 0 60px;
  text-align: center;
}

.faq-hero h1 {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.faq-hero p {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.85);
}

.faq-search {
  max-width: 600px;
  margin: 40px auto 0;
  position: relative;
}

.faq-search input {
  width: 100%;
  padding: 16px 24px 16px 56px;
  font-size: 1rem;
  border: none;
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-md);
}

.faq-search input:focus {
  outline: none;
  box-shadow: var(--shadow-lg), 0 0 0 3px rgba(255, 255, 255, 0.3);
}

.faq-search svg {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 22px;
  height: 22px;
  color: var(--text-secondary);
}

.faq-categories {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.faq-category-btn {
  padding: 10px 24px;
  background: var(--white);
  border: 2px solid var(--primary);
  border-radius: 30px;
  font-weight: 500;
  color: var(--primary);
  transition: var(--transition);
}

.faq-category-btn:hover,
.faq-category-btn.active {
  background: var(--primary);
  color: var(--white);
}

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

.faq-item {
  background: var(--white);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.05rem;
  transition: var(--transition);
}

.faq-question:hover {
  background: var(--bg-light);
}

.faq-question svg {
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
  transition: transform 0.3s ease;
}

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

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

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

.faq-answer-content {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.faq-answer-content a {
  color: var(--primary);
  font-weight: 500;
}

.faq-answer-content a:hover {
  text-decoration: underline;
}

/* ============================================
   关于页面
   ============================================ */
.about-hero {
  background: linear-gradient(135deg, var(--bg-light), var(--white));
  padding: 120px 0 80px;
}

.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-content h1 {
  font-size: 3rem;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.about-content p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-size: 1.1rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.about-stat {
  text-align: center;
  padding: 24px;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.about-stat h3 {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 4px;
}

.about-stat p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0;
}

.about-image {
  position: relative;
}

.about-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* 时间线 */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), var(--primary-light));
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  width: 50%;
  padding: 0 40px 40px;
}

.timeline-item:nth-child(odd) {
  left: 0;
  text-align: right;
}

.timeline-item:nth-child(even) {
  left: 50%;
}

.timeline-item::before {
  content: '';
  position: absolute;
  top: 8px;
  width: 16px;
  height: 16px;
  background: var(--primary);
  border-radius: 50%;
  border: 3px solid var(--white);
  box-shadow: var(--shadow-sm);
}

.timeline-item:nth-child(odd)::before {
  right: -8px;
}

.timeline-item:nth-child(even)::before {
  left: -8px;
}

.timeline-year {
  display: inline-block;
  padding: 4px 12px;
  background: var(--primary);
  color: var(--white);
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: 20px;
  margin-bottom: 12px;
}

.timeline-item h4 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.timeline-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* 团队成员 */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.team-member {
  text-align: center;
  padding: 32px 24px;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.team-member .avatar {
  width: 100px;
  height: 100px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: var(--white);
  font-weight: 700;
}

.team-member h4 {
  font-size: 1.125rem;
  margin-bottom: 4px;
}

.team-member .role {
  color: var(--primary);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 12px;
}

.team-member p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* 联系表单 */
.contact-section {
  background: var(--bg-light);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info h3 {
  font-size: 1.5rem;
  margin-bottom: 24px;
}

.contact-info p {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
}

.contact-item .icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--white);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

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

.contact-item h4 {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 2px;
}

.contact-item p {
  color: var(--text-primary);
  margin-bottom: 0;
}

.contact-form {
  background: var(--white);
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  border: 2px solid #E5E7EB;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(40, 85, 209, 0.1);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

/* ============================================
   页脚
   ============================================ */
.footer {
  background: var(--bg-dark);
  color: var(--white);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
  line-height: 1.8;
}

.footer-links h4 {
  font-size: 1rem;
  margin-bottom: 20px;
  color: var(--white);
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--white);
  padding-left: 4px;
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom p {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.875rem;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.7);
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--primary);
  color: var(--white);
}

.footer-social svg {
  width: 20px;
  height: 20px;
}

/* ============================================
   面包屑
   ============================================ */
.breadcrumb {
  padding: 16px 0;
  margin-top: 72px;
  background: var(--bg-light);
}

.breadcrumb-content {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
}

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

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

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

.breadcrumb strong {
  color: var(--primary);
  font-weight: 600;
}

/* ============================================
   对比表格
   ============================================ */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.compare-table th,
.compare-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid #E5E7EB;
}

.compare-table th {
  background: var(--bg-light);
  font-weight: 600;
  color: var(--text-primary);
}

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

.compare-table tr:last-child td {
  border-bottom: none;
}

.compare-table tr:hover td {
  background: var(--bg-light);
}

.check-icon {
  color: var(--success);
  font-weight: bold;
}

.cross-icon {
  color: #DC2626;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1200px) {
  .hero-content {
    gap: 40px;
  }
  
  .hero-text h1 {
    font-size: 2.8rem;
  }
  
  .card-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 992px) {
  .navbar-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    flex-direction: column;
    padding: 24px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    box-shadow: var(--shadow-lg);
  }
  
  .navbar-nav.active {
    transform: translateX(0);
  }
  
  .navbar-nav .nav-link {
    width: 100%;
    padding: 16px;
    font-size: 1.125rem;
  }
  
  .navbar-download {
    display: none;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-text h1 {
    font-size: 2.5rem;
  }
  
  .hero-text p {
    margin: 0 auto 32px;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .hero-image {
    order: -1;
  }
  
  .hero-image img {
    max-width: 400px;
  }
  
  .hero-badge {
    display: none;
  }
  
  .product-matrix {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }
  
  .feature-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .feature-grid.reverse {
    direction: ltr;
  }
  
  .highlights-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }
  
  .about-intro {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .about-stats {
    justify-content: center;
  }
  
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .system-requirements {
    grid-template-columns: 1fr;
  }
  
  .timeline::before {
    left: 20px;
  }
  
  .timeline-item {
    width: 100%;
    left: 0 !important;
    padding-left: 50px !important;
    padding-right: 0 !important;
    text-align: left !important;
  }
  
  .timeline-item::before {
    left: 12px !important;
    right: auto !important;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }
  
  .section-header h2 {
    font-size: 2rem;
  }
  
  .hero {
    min-height: auto;
    padding: 100px 0 60px;
  }
  
  .hero-text h1 {
    font-size: 2rem;
  }
  
  .hero-text p {
    font-size: 1rem;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: 24px;
  }
  
  .download-hero h1 {
    font-size: 2rem;
  }
  
  .download-cards {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .team-grid {
    grid-template-columns: 1fr;
    max-width: 300px;
    margin: 0 auto;
  }
}

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

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

.slide-up {
  animation: slideUp 0.6s ease forwards;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 滚动显示 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   辅助类
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.hidden { display: none; }
.visible { display: block; }