/* ==========================================
   WPS Office 官网落地页 - 样式表
   纯原生 CSS，无框架依赖
   ========================================== */

/* ---- 1. 基础重置与变量 ---- */
:root {
  --color-primary: #E60012;
  --color-primary-dark: #C5000F;
  --color-primary-light: #FFF0F1;
  --color-text: #1A1A1A;
  --color-text-secondary: #595959;
  --color-text-tertiary: #8C8C8C;
  --color-border: #E5E5E5;
  --color-bg: #F7F8FA;
  --color-white: #FFFFFF;
  --color-success: #52C41A;
  --color-orange: #FA8C16;
  --color-blue: #1890FF;
  --font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --container-max: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  line-height: 1.75;
  background-color: var(--color-white);
}

img, svg {
  display: inline-block;
  vertical-align: middle;
}

a {
  color: inherit;
  text-decoration: none;
}

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

ul, ol {
  list-style: none;
}

/* ---- 2. 通用布局 ---- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 120px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-title {
  font-size: 36px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 18px;
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ---- 3. 按钮组件 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 16px;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  cursor: pointer;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(230, 0, 18, 0.3);
}

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

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

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-large {
  padding: 16px 40px;
  font-size: 18px;
  font-weight: 600;
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none !important;
}

/* ---- 4. 导航栏 ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow var(--transition);
}

.navbar.scrolled {
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.nav-link.active {
  color: var(--color-primary);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  padding: 8px;
  color: var(--color-text);
  border-radius: var(--radius-md);
}

.nav-toggle:hover {
  background-color: var(--color-bg);
}

/* ---- 5. Hero 区域 ---- */
.hero {
  padding-top: 160px;
  padding-bottom: 100px;
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-white) 60%);
}

.hero-container {
  display: flex;
  align-items: center;
  gap: 60px;
}

.hero-content {
  flex: 1;
  min-width: 0;
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.hero-positioning {
  font-size: 16px;
  color: var(--color-text-tertiary);
  margin-bottom: 32px;
}

.hero-stats {
  display: flex;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.stat-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  min-width: 120px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
}

.stat-label {
  display: block;
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-top: 4px;
}

.hero-version {
  margin-top: 16px;
  font-size: 13px;
  color: var(--color-text-tertiary);
}

.hero-visual {
  flex-shrink: 0;
  width: 420px;
}

.hero-image-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* ---- 6. 功能特色 ---- */
.features {
  background-color: var(--color-white);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 80px;
}

.feature-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

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

.feature-icon {
  margin-bottom: 20px;
}

.feature-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* 详细介绍区 */
.feature-details {
  display: flex;
  flex-direction: column;
  gap: 60px;
}

.detail-block {
  display: flex;
  align-items: center;
  gap: 48px;
}

.detail-block.detail-reverse {
  flex-direction: row-reverse;
}

.detail-content {
  flex: 1;
}

.detail-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
}

.detail-text {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.detail-image {
  flex-shrink: 0;
  width: 320px;
  height: 220px;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
}

/* ---- 7. 多平台支持 ---- */
.platforms {
  background-color: var(--color-bg);
}

.platforms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.platform-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
}

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

.platform-icon {
  margin-bottom: 16px;
}

.platform-name {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.platform-info {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.platform-version {
  font-size: 13px;
  color: var(--color-text-tertiary);
  margin: 12px 0 20px;
}

/* ---- 8. 用户评价 ---- */
.reviews {
  background-color: var(--color-white);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.review-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}

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

.review-avatar {
  flex-shrink: 0;
}

.review-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.review-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
}

.review-rating {
  display: flex;
  gap: 2px;
}

.review-text {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---- 9. 安全保障 ---- */
.security {
  background-color: var(--color-bg);
}

.security-features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 80px;
}

.security-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  border: 1px solid var(--color-border);
}

.security-icon {
  margin-bottom: 16px;
}

.security-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.security-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* 对比表格 */
.comparison-section {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid var(--color-border);
}

.comparison-title {
  font-size: 24px;
  font-weight: 600;
  text-align: center;
  margin-bottom: 32px;
  color: var(--color-text);
}

.comparison-table-wrapper {
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.comparison-table th {
  padding: 14px 20px;
  text-align: left;
  font-weight: 600;
  color: var(--color-text);
  border-bottom: 2px solid var(--color-border);
  background: var(--color-bg);
}

.comparison-table th:first-child {
  border-radius: var(--radius-sm) 0 0 0;
}

.comparison-table th:last-child {
  border-radius: 0 var(--radius-sm) 0 0;
}

.comparison-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

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

.comparison-table tr:hover td {
  background-color: var(--color-bg);
}

.col-wps {
  color: var(--color-text);
}

.tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  margin-right: 6px;
  vertical-align: middle;
}

.tag-success {
  background: #F6FFED;
  color: var(--color-success);
  border: 1px solid #B7EB8F;
}

/* ---- 10. 版本选择 ---- */
.versions {
  background-color: var(--color-white);
}

.versions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.version-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 2px solid var(--color-border);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition);
}

.version-card:hover {
  box-shadow: var(--shadow-md);
}

.version-recommended {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary);
}

.version-badge-recommended {
  position: absolute;
  top: -1px;
  right: 24px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.version-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.version-name {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-text);
}

.version-badge {
  font-size: 12px;
  font-weight: 500;
  padding: 2px 10px;
  border-radius: 20px;
  background: var(--color-bg);
  color: var(--color-text-secondary);
}

.version-price {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.price-amount {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-text);
}

.price-highlight {
  color: var(--color-primary);
}

.price-period {
  font-size: 14px;
  color: var(--color-text-tertiary);
}

.version-features {
  flex: 1;
  margin-bottom: 24px;
}

.version-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.version-features li svg {
  flex-shrink: 0;
  margin-top: 2px;
}

.version-target {
  font-size: 13px;
  color: var(--color-text-tertiary);
  margin-bottom: 20px;
  font-style: italic;
}

/* ---- 11. FAQ ---- */
.faq {
  background-color: var(--color-bg);
}

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

.faq-item {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  transition: background var(--transition);
}

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

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-icon {
  flex-shrink: 0;
  transition: transform var(--transition);
  color: var(--color-text-tertiary);
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 20px;
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.8;
}

.faq-answer p {
  margin-bottom: 12px;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* ---- 12. 页脚 ---- */
.footer {
  background-color: #1A1A1A;
  color: var(--color-white);
  padding: 60px 0 0;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid #333;
}

.footer-brand svg {
  margin-bottom: 16px;
}

.footer-desc {
  font-size: 14px;
  color: #999;
  line-height: 1.7;
  max-width: 280px;
}

.footer-links h4,
.footer-contact h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-white);
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  font-size: 14px;
  color: #999;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-white);
}

.footer-contact p {
  font-size: 14px;
  color: #999;
  margin-bottom: 8px;
}

.footer-bottom {
  padding: 20px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: #666;
}

/* ---- 13. 动画 ---- */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ---- 14. 响应式适配 ---- */
@media (max-width: 1024px) {
  .hero-container {
    flex-direction: column;
    gap: 40px;
  }
  
  .hero-visual {
    width: 100%;
    max-width: 480px;
    margin: 0 auto;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .security-features {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .detail-block,
  .detail-block.detail-reverse {
    flex-direction: column;
    gap: 24px;
  }
  
  .detail-image {
    width: 100%;
  }
  
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .section {
    padding: 80px 0;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .hero {
    padding-top: 120px;
    padding-bottom: 60px;
  }
  
  .hero-title {
    font-size: 32px;
  }
  
  .hero-stats {
    gap: 10px;
  }
  
  .stat-card {
    padding: 12px 14px;
    min-width: 100px;
  }
  
  .stat-number {
    font-size: 18px;
  }
  
  .features-grid,
  .platforms-grid,
  .reviews-grid,
  .security-features,
  .versions-grid {
    grid-template-columns: 1fr;
  }
  
  .comparison-section {
    padding: 24px;
  }
  
  .comparison-table {
    font-size: 13px;
  }
  
  .comparison-table th,
  .comparison-table td {
    padding: 10px 12px;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  /* 移动端导航 */
  .nav-menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 12px 24px;
    gap: 2px;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
    box-shadow: var(--shadow-md);
  }
  
  .nav-menu.nav-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
  
  .nav-link {
    padding: 10px 12px;
    width: 100%;
  }
  
  .nav-toggle {
    display: block;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .hero-title {
    font-size: 26px;
  }
  
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .section {
    padding: 60px 0;
  }
  
  .section-title {
    font-size: 24px;
  }
  
  .btn-large {
    padding: 14px 28px;
    font-size: 16px;
  }
}