/* ============================================
   TeachSeek 官网共享样式
   政务简约正式风格 — 深海军蓝主色
   ============================================ */

:root {
  /* 主色 */
  --color-primary: #14508c;
  --color-primary-dark: #0d3a66;
  --color-primary-light: #e8f0f8;

  /* 强调色（仅用于版本徽章/状态） */
  --color-accent: #c9a227;
  --color-success: #2d8659;
  --color-danger: #b3402f;

  /* 中性色 */
  --color-bg: #ffffff;
  --color-bg-alt: #f5f7fa;
  --color-border: #dfe4ea;
  --color-text-primary: #1f2937;
  --color-text-secondary: #5a6573;
  --color-text-muted: #8b95a3;

  /* 布局 */
  --radius-sm: 4px;
  --radius-md: 6px;
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.1);
  --max-width: 1200px;
  --nav-height: 60px;

  /* 字体 */
  --font-sans: "Microsoft YaHei", "PingFang SC", "Source Han Sans SC",
               "Noto Sans CJK SC", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: "Cascadia Code", "Consolas", "Courier New", monospace;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

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

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

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

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
  display: flex;
  align-items: center;
}

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

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

.navbar-brand img {
  height: 32px;
  width: auto;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.navbar-nav a {
  display: block;
  padding: 8px 16px;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

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

.navbar-nav a.active {
  background: var(--color-primary);
  color: #fff;
}

/* 版本徽章 */
.version-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 20px;
  font-family: var(--font-mono);
  white-space: nowrap;
}

/* ===== Hero 区 ===== */
.hero {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: #fff;
  padding: 80px 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.hero p {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-sans);
}

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

.btn-primary:hover {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
}

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

.btn-action:hover {
  background: var(--color-primary-dark);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.8rem;
}

/* ===== 区块标题 ===== */
.section {
  padding: 64px 0;
}

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

.section-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-text-primary);
  text-align: center;
  margin-bottom: 8px;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 40px;
}

/* ===== 卡片网格 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.card-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  font-size: 1.3rem;
}

.card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 8px;
}

.card p {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ===== 截图展示 ===== */
.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.screenshot-item {
  text-align: center;
}

.screenshot-item img {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.screenshot-item figcaption {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* ===== 技术栈标签 ===== */
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.tech-tag {
  display: inline-block;
  padding: 6px 16px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}

/* ===== 版本摘要 ===== */
.version-summary {
  max-width: 800px;
  margin: 0 auto;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 24px 28px;
}

.version-summary ul {
  list-style: none;
  padding: 0;
}

.version-summary li {
  padding: 6px 0;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
}

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

.version-summary li::before {
  content: "•";
  color: var(--color-primary);
  font-weight: bold;
  margin-right: 8px;
}

/* ===== 实例卡片（部署导航页） ===== */
.instance-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.instance-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  text-align: center;
  transition: box-shadow 0.2s;
}

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

.instance-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 4px;
}

.instance-meta {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.instance-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.status-online {
  background: rgba(45, 134, 89, 0.1);
  color: var(--color-success);
}

.status-online .status-dot {
  background: var(--color-success);
}

.status-offline {
  background: rgba(179, 64, 47, 0.1);
  color: var(--color-danger);
}

.status-offline .status-dot {
  background: var(--color-danger);
}

.status-checking {
  background: rgba(139, 149, 163, 0.1);
  color: var(--color-text-muted);
}

.status-checking .status-dot {
  background: var(--color-text-muted);
}

.instance-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.instance-actions .btn {
  width: 100%;
  justify-content: center;
}

/* ===== 代码块 ===== */
.code-block {
  position: relative;
  background: #1e293b;
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 16px 0;
  overflow-x: auto;
}

.code-block pre {
  color: #e2e8f0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  white-space: pre;
}

.code-block .code-copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(255, 255, 255, 0.1);
  color: #e2e8f0;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  padding: 4px 12px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-sans);
}

.code-block .code-copy-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.code-block .code-copy-btn.copied {
  background: var(--color-success);
  border-color: var(--color-success);
}

/* ===== 安装命令区 ===== */
.install-section {
  margin-bottom: 32px;
}

.install-section h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 8px;
  padding-left: 12px;
  border-left: 3px solid var(--color-primary);
}

/* ===== 表格 ===== */
.table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.88rem;
}

.table th {
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  font-weight: 600;
  text-align: left;
  padding: 10px 16px;
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}

.table td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-primary);
}

.table td code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: var(--color-bg-alt);
  padding: 2px 6px;
  border-radius: 3px;
}

/* ===== T14/T10 特性列表 ===== */
.feature-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  list-style: none;
  padding: 0;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
}

.feature-list .feature-id {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.feature-list .feature-text {
  flex: 1;
}

.feature-list .feature-text strong {
  display: block;
  color: var(--color-text-primary);
  margin-bottom: 2px;
}

.feature-list .feature-text span {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ===== 技术优势卡片 ===== */
.advantage-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.advantage-card {
  text-align: center;
  padding: 20px 12px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.advantage-card .adv-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.advantage-card h4 {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 4px;
}

.advantage-card p {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

/* ===== 步骤流程 ===== */
.step-list {
  counter-reset: step;
  list-style: none;
  padding: 0;
  max-width: 800px;
  margin: 0 auto;
}

.step-list li {
  counter-increment: step;
  position: relative;
  padding: 12px 0 12px 48px;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
}

.step-list li:last-child {
  border-bottom: none;
}

.step-list li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 10px;
  width: 32px;
  height: 32px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

/* ===== 折叠区 ===== */
.collapse {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
}

.collapse-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--color-bg-alt);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text-primary);
}

.collapse-header:hover {
  background: var(--color-primary-light);
}

.collapse-toggle {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.collapse-body {
  padding: 16px 20px;
  display: none;
}

.collapse-body.open {
  display: block;
}

/* ===== 页脚 ===== */
.footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: 40px 0 24px;
  margin-top: 64px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer p {
  font-size: 0.85rem;
}

.footer .tech-stack {
  font-size: 0.78rem;
  opacity: 0.6;
  font-family: var(--font-mono);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .navbar-nav {
    gap: 2px;
  }

  .navbar-nav a {
    padding: 6px 10px;
    font-size: 0.82rem;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .hero p {
    font-size: 0.95rem;
  }

  .card-grid,
  .screenshot-grid,
  .instance-grid {
    grid-template-columns: 1fr;
  }

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

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

  .section {
    padding: 40px 0;
  }

  .hero {
    padding: 48px 0;
  }
}