/* ===== 全局变量定义 ===== */
:root {
  --color-primary: #00d4aa;
  --color-primary-dark: #00b894;
  --color-secondary: #6c5ce7;
  --color-accent: #0984e3;
  --color-warning: #fdcb6e;
  --color-danger: #e17055;
  --color-success: #00b894;
  --color-bg-body: #0a0e1a;
  --color-bg-card: #131a2e;
  --color-bg-card-hover: #1a2340;
  --color-bg-header: rgba(10, 14, 26, 0.95);
  --color-text-primary: #e8eaf6;
  --color-text-secondary: #a0a8c0;
  --color-text-muted: #6b7394;
  --color-border: #1e2a45;
  --color-border-light: #2a3555;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(0, 212, 170, 0.15);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --font-main: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;
  --max-width: 1200px;
  --header-height: 64px;
}

/* ===== 重置与基础 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg-body);
  color: var(--color-text-primary);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}

/* ===== 头部导航 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-bg-header);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow var(--transition-normal);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.site-logo img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-menu a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  padding: 6px 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-primary);
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-normal);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border: none;
  background: none;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
  border-radius: 2px;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== 主内容区 ===== */
.main-content {
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 首屏区域 ===== */
.hero-section {
  position: relative;
  padding: 80px 20px;
  text-align: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-bg-body) 0%, #0d1525 50%, #111b33 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  opacity: 0.3;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero-content h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content .subtitle {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  line-height: 1.8;
}

/* 搜索框 */
.search-box {
  max-width: 560px;
  margin: 0 auto;
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 16px 56px 16px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box input:focus {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.search-box input::placeholder {
  color: var(--color-text-muted);
}

.search-box button {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--color-primary);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.search-box button:hover {
  background: var(--color-primary-dark);
}

.search-suggestions {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 8px 0;
  display: none;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.search-suggestions.show {
  display: block;
}

.search-suggestions a {
  display: block;
  padding: 10px 20px;
  color: var(--color-text-secondary);
  transition: background var(--transition-fast);
}

.search-suggestions a:hover {
  background: var(--color-bg-card-hover);
  color: var(--color-primary);
}

/* ===== 卡片网格 ===== */
.section-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text-primary);
}

.section-desc {
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  font-size: 0.95rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  display: flex;
  flex-direction: column;
}

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

.card-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 16px;
  border-radius: var(--radius-sm);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--color-text-primary);
}

.card-desc {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  flex: 1;
}

.card-link {
  margin-top: 16px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--color-primary);
  font-weight: 500;
}

.card-link::after {
  content: '→';
  transition: transform var(--transition-fast);
}

.card:hover .card-link::after {
  transform: translateX(4px);
}

/* ===== FAQ 折叠 ===== */
.faq-section {
  padding: 60px 0;
}

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

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  background: var(--color-bg-card);
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--color-border-light);
}

.faq-question {
  padding: 18px 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  color: var(--color-text-primary);
  user-select: none;
  transition: background var(--transition-fast);
}

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

.faq-question::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--color-primary);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.active .faq-question::after {
  content: '−';
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-normal);
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 24px 18px;
}

.faq-answer p {
  color: var(--color-text-secondary);
  line-height: 1.8;
  font-size: 0.92rem;
}

/* ===== 步骤指南 ===== */
.steps-section {
  padding: 60px 0;
}

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

.step-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  position: relative;
  text-align: center;
}

.step-number {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  margin: 0 auto 16px;
}

.step-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text-primary);
}

.step-desc {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* ===== 状态指示 ===== */
.status-section {
  padding: 60px 0;
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.status-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.status-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
  animation: pulse 2s infinite;
}

.status-dot.online {
  background: var(--color-success);
  box-shadow: 0 0 8px var(--color-success);
}

.status-dot.offline {
  background: var(--color-danger);
  box-shadow: 0 0 8px var(--color-danger);
}

.status-dot.maintenance {
  background: var(--color-warning);
  box-shadow: 0 0 8px var(--color-warning);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.status-info h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.status-info p {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* ===== 通用内页 ===== */
.page-header {
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 40px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

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

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

.page-header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.page-header .page-desc {
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}

.content-section {
  padding: 40px 0;
}

.content-section h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text-primary);
}

.content-section h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text-primary);
}

.content-section p {
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  line-height: 1.8;
}

.content-section ul,
.content-section ol {
  padding-left: 20px;
  margin-bottom: 16px;
}

.content-section li {
  color: var(--color-text-secondary);
  margin-bottom: 8px;
  line-height: 1.7;
  list-style: disc;
}

.content-section ol li {
  list-style: decimal;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  color: #fff;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  padding: 48px 0 24px;
  margin-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  margin-bottom: 32px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text-primary);
}

.footer-col a {
  display: block;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  padding: 4px 0;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.82rem;
}

.footer-bottom a {
  color: var(--color-text-secondary);
  margin: 0 8px;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 999;
  border: none;
  box-shadow: var(--shadow-md);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

/* ===== PWA 安装提示 ===== */
.pwa-prompt {
  position: fixed;
  bottom: 80px;
  left: 20px;
  right: 20px;
  max-width: 400px;
  margin: 0 auto;
  background: var(--color-bg-card);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 20px;
  display: none;
  z-index: 998;
  box-shadow: var(--shadow-lg);
}

.pwa-prompt.show {
  display: block;
  animation: slideUp 0.3s ease;
}

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

.pwa-prompt h4 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--color-text-primary);
}

.pwa-prompt p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.pwa-prompt-actions {
  display: flex;
  gap: 12px;
}

.pwa-prompt-actions button {
  flex: 1;
  padding: 10px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
}

.pwa-install-btn {
  background: var(--color-primary);
  color: #fff;
}

.pwa-dismiss-btn {
  background: var(--color-bg-card-hover);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border) !important;
}

/* ===== 表单提交提示 ===== */
.toast {
  position: fixed;
  top: 80px;
  right: 20px;
  padding: 16px 24px;
  border-radius: var(--radius-sm);
  background: var(--color-success);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 500;
  z-index: 9999;
  opacity: 0;
  transform: translateX(100%);
  transition: all var(--transition-normal);
}

.toast.show {
  opacity: 1;
  transform: translateX(0);
}

/* ===== 合规提醒横幅 ===== */
.compliance-banner {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 32px 0;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.compliance-banner .icon {
  font-size: 1.2rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.compliance-banner p {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  line-height: 1.7;
}

.compliance-banner a {
  color: var(--color-primary);
  font-weight: 500;
}

/* ===== 标签切换 ===== */
.tab-nav {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 24px;
  overflow-x: auto;
}

.tab-btn {
  padding: 12px 20px;
  border: none;
  background: none;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tab-btn.active,
.tab-btn:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* ===== 响应式断点 ===== */
@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .menu-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-body);
    flex-direction: column;
    padding: 32px 20px;
    gap: 16px;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
  }

  .nav-menu.open {
    transform: translateX(0);
  }

  .nav-menu a {
    font-size: 1.1rem;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
  }

  .hero-content h1 {
    font-size: 1.8rem;
  }

  .hero-content .subtitle {
    font-size: 1rem;
  }

  .hero-section {
    padding: 48px 16px;
  }

  .section-title {
    font-size: 1.3rem;
  }

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

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

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .page-header h1 {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .pwa-prompt {
    left: 12px;
    right: 12px;
  }
}

/* ===== 表单样式 ===== */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--color-text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  font-size: 0.9rem;
  font-family: var(--font-main);
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-primary);
}

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

/* ===== 关联链接区 ===== */
.related-links {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

.related-links h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.related-links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.related-links-grid a {
  display: block;
  padding: 12px 16px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  transition: all var(--transition-fast);
}

.related-links-grid a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-bg-card-hover);
}

/* ===== 搜索结果 ===== */
.search-results {
  margin-top: 24px;
}

.search-result-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.search-result-item h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.search-result-item h3 a {
  color: var(--color-primary);
}

.search-result-item p {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  line-height: 1.6;
}

.search-result-item .result-path {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  margin-top: 4px;
}

/* ===== 404页面 ===== */
.error-page {
  text-align: center;
  padding: 80px 20px;
}

.error-page h1 {
  font-size: 6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}

.error-page h2 {
  font-size: 1.5rem;
  margin-bottom: 16px;
  color: var(--color-text-primary);
}

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

.error-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}