/* ========================================
   WPS Office 官方网站 - 全局样式
   ======================================== */

/* CSS 变量 */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f7f8fa;
  --color-brand: #e60012;
  --color-brand-hover: #c5000f;
  --color-text-primary: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-border: #e5e7eb;
  --color-green: #22c55e;
  --color-cta-bg: #fef2f2;
  --font-family: -apple-system, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", sans-serif;
  --max-width: 1200px;
  --nav-height: 64px;
  --section-padding: 80px;
  --transition: 0.2s ease;
  --border-radius: 8px;
}

/* 全局重置 */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
}

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

button {
  cursor: pointer;
  font-family: inherit;
}

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

ul, ol {
  list-style: none;
}

/* ========================================
   公共布局
   ======================================== */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.3;
  text-align: center;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--color-text-secondary);
  text-align: center;
  margin-bottom: 48px;
  line-height: 1.6;
}

/* ========================================
   导航栏
   ======================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  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(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-logo {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.nav-brand-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text-primary);
}

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

.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-primary);
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-brand);
  background: rgba(230, 0, 18, 0.06);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  background: var(--color-brand);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: 6px;
  transition: background var(--transition), transform var(--transition);
  flex-shrink: 0;
}

.nav-cta:hover {
  background: var(--color-brand-hover);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  padding: 4px;
}

/* ========================================
   首页 Hero
   ======================================== */

.hero {
  padding-top: calc(var(--nav-height) + var(--section-padding));
  padding-bottom: var(--section-padding);
  background: var(--color-bg);
}

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

.hero-content {
  flex: 1 1 55%;
  max-width: 55%;
}

.hero-image {
  flex: 1 1 45%;
  max-width: 45%;
}

.hero-image img {
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  width: 100%;
}

.hero-title {
  font-size: 40px;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.2;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 32px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  background: var(--color-brand);
  color: #fff;
  font-size: 18px;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  transition: background var(--transition), transform var(--transition);
  margin-bottom: 12px;
}

.hero-cta:hover {
  background: var(--color-brand-hover);
  transform: translateY(-2px);
}

.btn-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.hero-note {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}

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

.stat-number {
  font-size: 48px;
  font-weight: 800;
  color: var(--color-brand);
  line-height: 1.1;
}

.stat-label {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-top: 4px;
}

/* ========================================
   功能特色
   ======================================== */

.features {
  background: var(--color-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 64px;
}

.feature-card {
  padding: 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-bg);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.feature-card:hover {
  border-color: var(--color-brand);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(230, 0, 18, 0.08);
}

.feature-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 100%;
  height: 100%;
}

.feature-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 功能特色详细描述 */
.features-detail {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

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

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

.detail-text {
  flex: 1 1 50%;
}

.detail-text h4 {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 12px;
}

.detail-text p {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.detail-image {
  flex: 1 1 50%;
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.detail-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* ========================================
   多平台支持
   ======================================== */

.platforms {
  background: var(--color-bg-alt);
}

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

.platform-card {
  text-align: center;
  padding: 40px 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.platform-card:hover {
  border-color: var(--color-brand);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.platform-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
}

.platform-icon svg {
  width: 100%;
  height: 100%;
}

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

.platform-version {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.platform-requirement {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--color-brand);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: 6px;
  transition: background var(--transition), transform var(--transition);
  width: 100%;
  max-width: 200px;
}

.btn-download:hover {
  background: var(--color-brand-hover);
  transform: translateY(-1px);
}

/* ========================================
   用户评价
   ======================================== */

.reviews {
  background: var(--color-bg);
}

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

.review-card {
  padding: 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-bg);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.review-card:hover {
  border-color: var(--color-brand);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.review-stars {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
}

.review-stars svg {
  width: 18px;
  height: 18px;
  color: #f59e0b;
  flex-shrink: 0;
}

.review-text {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.review-author strong {
  color: var(--color-text-primary);
  font-weight: 600;
}

.review-author span {
  color: var(--color-text-secondary);
  font-size: 14px;
  margin-left: 8px;
}

/* ========================================
   安全保障
   ======================================== */

.security {
  background: var(--color-bg);
}

.security-content {
  display: flex;
  gap: 48px;
  align-items: flex-start;
}

.security-info {
  flex: 1 1 50%;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.security-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.security-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
}

.security-icon svg {
  width: 100%;
  height: 100%;
}

.security-text h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 8px;
}

.security-text p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 对比表格 */
.security-compare {
  flex: 1 1 50%;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 32px;
}

.compare-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 20px;
  text-align: center;
}

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

.compare-table th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  color: var(--color-text-primary);
  border-bottom: 2px solid var(--color-border);
  background: var(--color-bg);
}

.compare-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.compare-table td.highlight {
  color: var(--color-brand);
  font-weight: 600;
}

.compare-table tr:hover td {
  background: rgba(230, 0, 18, 0.02);
}

/* ========================================
   版本选择
   ======================================== */

.versions {
  background: var(--color-bg-alt);
}

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

.version-card {
  position: relative;
  padding: 40px 32px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  text-align: center;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.version-card:not(.version-recommended):hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.version-card:hover {
  border-color: var(--color-brand);
}

.version-recommended {
  border-color: var(--color-brand);
  border-width: 2px;
  transform: scale(1.04);
  box-shadow: 0 12px 32px rgba(230, 0, 18, 0.1);
  z-index: 2;
}

.version-badge {
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-brand);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 20px;
  border-radius: 0 0 12px 12px;
}

.version-header {
  margin-bottom: 28px;
}

.version-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 12px;
}

.version-price {
  font-size: 36px;
  font-weight: 800;
  color: var(--color-brand);
  line-height: 1.2;
}

.version-price span {
  font-size: 16px;
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-left: 4px;
}

.version-price del {
  display: block;
  font-size: 14px;
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-top: 4px;
}

.version-features {
  text-align: left;
  margin-bottom: 28px;
}

.version-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 0;
  font-size: 15px;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
}

.version-features li:last-child {
  border-bottom: none;
}

.version-features li svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
}

.version-features li:not(.disabled) svg {
  color: var(--color-green);
}

.version-features li.disabled {
  color: #b0b0b5;
}

.version-features li.disabled svg {
  color: #d1d1d6;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 36px;
  background: var(--color-brand);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 6px;
  transition: background var(--transition), transform var(--transition);
  width: 100%;
}

.btn-primary:hover {
  background: var(--color-brand-hover);
  transform: translateY(-1px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 36px;
  background: transparent;
  color: var(--color-brand);
  font-size: 16px;
  font-weight: 600;
  border: 2px solid var(--color-brand);
  border-radius: 6px;
  transition: background var(--transition), color var(--transition), transform var(--transition);
  width: 100%;
}

.btn-outline:hover {
  background: var(--color-brand);
  color: #fff;
  transform: translateY(-1px);
}

/* ========================================
   FAQ
   ======================================== */

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

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item.active {
  border-color: var(--color-brand);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  font-size: 17px;
  font-weight: 500;
  color: var(--color-text-primary);
  text-align: left;
  cursor: pointer;
  transition: color var(--transition);
}

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

.faq-item.active .faq-question {
  color: var(--color-brand);
}

.faq-arrow {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-arrow {
  transform: rotate(90deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.3s ease, opacity 0.2s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  opacity: 1;
  padding: 0 24px 20px;
}

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

/* ========================================
   底部 CTA
   ======================================== */

.bottom-cta {
  background: var(--color-cta-bg);
  padding: 80px 0;
}

.bottom-cta-container {
  text-align: center;
}

.bottom-cta-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 12px;
}

.bottom-cta-subtitle {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.bottom-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 40px;
  background: var(--color-brand);
  color: #fff;
  font-size: 18px;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  transition: background var(--transition), transform var(--transition);
}

.bottom-cta-btn:hover {
  background: var(--color-brand-hover);
  transform: translateY(-2px);
}

/* ========================================
   页脚
   ======================================== */

.footer {
  padding: 32px 0;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-text {
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* ========================================
   Loading 动画
   ======================================== */

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

/* ========================================
   响应式 - 平板 (768px - 1023px)
   ======================================== */

@media (max-width: 1023px) {
  :root {
    --section-padding: 60px;
  }

  .nav-menu {
    gap: 2px;
  }

  .nav-link {
    padding: 6px 10px;
    font-size: 14px;
  }

  .hero-container {
    gap: 40px;
  }

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

  .hero-stats {
    gap: 24px;
  }

  .stat-number {
    font-size: 36px;
  }

  .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-content {
    flex-direction: column;
  }

  .security-compare {
    width: 100%;
  }

  .versions-grid {
    grid-template-columns: repeat(1, 1fr);
    max-width: 480px;
    margin: 0 auto;
  }

  .version-recommended {
    transform: scale(1);
    order: -1;
  }

  .detail-block,
  .detail-block.detail-reverse {
    flex-direction: column;
  }

  .detail-text,
  .detail-image {
    max-width: 100%;
  }
}

/* ========================================
   响应式 - 移动端 (< 768px)
   ======================================== */

@media (max-width: 767px) {
  .container {
    padding: 0 20px;
  }

  .nav-container {
    padding: 0 16px;
  }

  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 16px;
    gap: 0;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-link {
    padding: 12px 16px;
    font-size: 16px;
    border-radius: 6px;
    width: 100%;
  }

  .nav-toggle {
    display: block;
  }

  .nav-cta {
    display: none;
  }

  .hero-container {
    flex-direction: column;
  }

  .hero-content {
    max-width: 100%;
    text-align: center;
  }

  .hero-image {
    max-width: 100%;
  }

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

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

  .hero-stats {
    justify-content: center;
    gap: 20px;
  }

  .stat-item {
    text-align: center;
    flex: 1 1 45%;
  }

  .stat-number {
    font-size: 32px;
  }

  .section-title {
    font-size: 24px;
  }

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

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

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

  .security-content {
    flex-direction: column;
  }

  .security-item {
    gap: 16px;
  }

  .security-icon {
    width: 40px;
    height: 40px;
  }

  .compare-table {
    font-size: 13px;
  }

  .compare-table th,
  .compare-table td {
    padding: 10px 12px;
  }

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

  .version-recommended {
    transform: scale(1);
  }

  .detail-block,
  .detail-block.detail-reverse {
    flex-direction: column;
    gap: 24px;
  }

  .bottom-cta-title {
    font-size: 22px;
  }

  .faq-question {
    font-size: 15px;
    padding: 16px 20px;
  }

  .faq-item.active .faq-answer {
    padding: 0 20px 16px;
  }
}