/* ===== WPS Office 安全下载站 - 全局样式 ===== */

/* CSS 变量定义 */
:root {
  --brand-primary: #ff6a00;
  --brand-primary-hover: #e65f00;
  --brand-secondary: #ff8c00;
  --brand-gradient: linear-gradient(135deg, #ff6a00 0%, #ff8c00 100%);
  --dark-bg: #1a1a2e;
  --darker-bg: #16213e;
  --card-bg: #ffffff;
  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --text-light: #9ca3af;
  --border-color: #e5e7eb;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --max-width: 1200px;
  --nav-height: 72px;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text-primary);
  background: #f8f9fa;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 链接样式 */
a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color 0.2s;
}

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

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

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: box-shadow 0.3s;
}

.navbar.scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

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

.logo {
  display: flex;
  align-items: center;
  font-size: 24px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.logo svg {
  margin-right: 10px;
  flex-shrink: 0;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-menu a {
  display: block;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: all 0.2s;
}

.nav-menu a:hover {
  color: var(--brand-primary);
  background: rgba(255, 106, 0, 0.06);
}

.nav-menu a.active {
  color: var(--brand-primary);
  background: rgba(255, 106, 0, 0.1);
  font-weight: 600;
}

/* ===== 按钮样式 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--brand-gradient);
  color: white;
  box-shadow: 0 4px 16px rgba(255, 106, 0, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 106, 0, 0.45);
  color: white;
}

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

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

.btn-secondary:hover {
  background: rgba(255, 106, 0, 0.05);
  color: var(--brand-primary-hover);
}

.btn-dark {
  background: var(--dark-bg);
  color: white;
  border: 2px solid rgba(255,255,255,0.1);
}

.btn-dark:hover {
  background: var(--darker-bg);
  color: white;
}

.btn-lg {
  padding: 16px 40px;
  font-size: 18px;
  border-radius: 12px;
}

.btn-sm {
  padding: 10px 20px;
  font-size: 14px;
}

/* ===== 区块通用样式 ===== */
.section {
  padding: 80px 0;
}

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

.section-header h2 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-header p {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== 卡片样式 ===== */
.card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 32px;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
  transform: translateY(-4px);
  border-color: transparent;
}

/* ===== 星级评分 ===== */
.stars {
  display: flex;
  gap: 4px;
  color: #ffc107;
}

/* ===== FAQ 样式 ===== */
.faq-item {
  background: white;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  margin-bottom: 16px;
  transition: all 0.3s;
}

.faq-item:hover {
  border-color: #d1d5db;
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s;
}

.faq-question:hover {
  background: #f9fafb;
}

.faq-question svg {
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

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

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

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

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

/* ===== 表格样式 ===== */
.table-container {
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  font-size: 15px;
}

th {
  background: #f9fafb;
  padding: 16px;
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
}

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

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

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

.cross-icon {
  color: var(--danger-color);
}

/* ===== 页脚 ===== */
.footer {
  background: var(--dark-bg);
  color: rgba(255, 255, 255, 0.6);
  padding: 40px 0;
  text-align: center;
  font-size: 14px;
  line-height: 1.8;
}

.footer p {
  max-width: 800px;
  margin: 0 auto;
}

/* ===== Loading 动画 ===== */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ===== 滚动渐入动画 ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 网格布局 ===== */
.grid {
  display: grid;
  gap: 24px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }

/* ===== 响应式设计 ===== */
@media (max-width: 992px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-6 { grid-template-columns: repeat(3, 1fr); }
  .section-header h2 { font-size: 30px; }
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 { grid-template-columns: 1fr; }
  .grid-6 { grid-template-columns: repeat(2, 1fr); }
  
  .navbar-inner {
    padding: 0 16px;
  }
  
  .nav-menu a {
    padding: 8px 14px;
    font-size: 14px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .section-header h2 {
    font-size: 26px;
  }
  
  .section-header p {
    font-size: 16px;
  }
  
  .btn-lg {
    padding: 14px 28px;
    font-size: 16px;
  }
  
  .logo {
    font-size: 20px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .nav-menu {
    gap: 4px;
  }
  
  .nav-menu a {
    padding: 6px 10px;
    font-size: 13px;
  }
}

/* ===== 辅助类 ===== */
.text-center { text-align: center; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }