/* ============ 智能说明书系统 · 前台样式（蓝白风格） ============ */
:root {
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --blue-light: #eff6ff;
  --text: #1f2937;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --bg: #f8fafc;
  --white: #ffffff;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; background: var(--bg); color: var(--text); font-size: 14px; line-height: 1.6; }
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-dark); }

.app { min-height: 100vh; display: flex; flex-direction: column; }

/* 顶部导航 */
.topbar { background: var(--blue); color: #fff; box-shadow: 0 1px 4px rgba(0,0,0,.12); position: sticky; top: 0; z-index: 60; }
.topbar-inner { max-width: 1200px; margin: 0 auto; padding: 12px 24px; display: flex; align-items: center; gap: 12px; }
.brand { display: flex; align-items: center; gap: 8px; color: #fff; font-weight: 600; font-size: 18px; }
.brand:hover { color: #fff; opacity: .92; }
.brand-logo { font-size: 22px; }
.brand-sub { color: rgba(255,255,255,.85); font-size: 13px; border-left: 1px solid rgba(255,255,255,.35); padding-left: 12px; }

/* 移动端菜单按钮（汉堡，点一下开、再点一下关，打开时变为 ✕） */
.menu-btn { display: none; flex-direction: column; gap: 4px; background: transparent; border: none; cursor: pointer; padding: 6px 8px; border-radius: 6px; }
.menu-btn span { width: 20px; height: 2px; background: #fff; border-radius: 2px; transition: transform .2s ease, opacity .2s ease; }
.menu-btn:hover { background: rgba(255,255,255,.15); }
body.sb-open .menu-btn span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
body.sb-open .menu-btn span:nth-child(2) { opacity: 0; }
body.sb-open .menu-btn span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 移动端遮罩 */
.overlay { display: none; position: fixed; inset: 0; background: rgba(15,23,42,.45); z-index: 48; }

/* 主体布局 */
.layout { max-width: 1200px; margin: 0 auto; width: 100%; display: flex; align-items: flex-start; gap: 24px; padding: 24px; flex: 1; }

/* 左侧目录 */
.sidebar { width: 250px; flex-shrink: 0; background: var(--white); border: 1px solid var(--border); border-radius: 10px; padding: 12px 10px; position: sticky; top: 76px; max-height: calc(100vh - 92px); overflow-y: auto; transition: width .2s ease, padding .2s ease; }
.sidebar-head { display: flex; align-items: center; justify-content: space-between; padding: 4px 6px 10px; }
.sidebar-title { font-size: 13px; color: var(--text-muted); font-weight: 600; }
.sidebar-head-btns { display: flex; gap: 6px; }
.sb-collapse-btn, .sb-close-btn { border: 1px solid var(--border); background: var(--white); color: var(--text-muted); border-radius: 6px; width: 26px; height: 24px; cursor: pointer; font-size: 13px; line-height: 1; }
.sb-collapse-btn:hover, .sb-close-btn:hover { background: var(--blue-light); color: var(--blue-dark); }
.sb-close-btn { display: none; }

/* 悬浮展开按钮：侧栏收起后显示（桌面端），醒目蓝色圆形，可拖拽 */
.sb-restore { display: none; position: fixed; left: 14px; top: 76px; z-index: 45; width: 44px; height: 44px; background: var(--blue); color: #fff; border: 2px solid #fff; border-radius: 50%; cursor: grab; font-size: 20px; align-items: center; justify-content: center; box-shadow: 0 4px 16px rgba(37,99,235,.45); user-select: none; touch-action: none; transition: transform .15s, background .15s; }
.sb-restore:hover { background: var(--blue-dark); transform: scale(1.08); }
.sb-restore.dragging { cursor: grabbing; transform: scale(1.1); }
.sb-restore::after { content: "展开目录"; position: absolute; left: 52px; top: 50%; transform: translateY(-50%); background: rgba(15,23,42,.85); color: #fff; font-size: 12px; padding: 4px 10px; border-radius: 6px; white-space: nowrap; opacity: 0; pointer-events: none; transition: opacity .15s; }
.sb-restore:hover::after { opacity: 1; }
.app.sb-collapsed .sb-restore { display: flex; }

/* 整栏收缩状态 */
.app.sb-collapsed .sidebar { width: 0; padding-left: 0; padding-right: 0; border-left: none; border-right: none; overflow: hidden; }
.app.sb-collapsed .sidebar-head, .app.sb-collapsed .tree { display: none; }

/* 目录树（节点可展开/收起） */
.tree-node { margin: 1px 0; }
.tree-row { display: flex; align-items: center; gap: 2px; }
.tree-toggle { border: none; background: transparent; color: var(--text-muted); width: 22px; height: 22px; flex-shrink: 0; cursor: pointer; font-size: 12px; border-radius: 4px; line-height: 1; transition: transform .15s; }
.tree-toggle:hover { background: var(--blue-light); color: var(--blue-dark); }
.tree-toggle-empty { visibility: hidden; }
.tree-toggle.collapsed { transform: rotate(-90deg); }
.tree-children { padding-left: 14px; }
.tree-children.collapsed { display: none; }
.tree-cat { display: flex; align-items: center; gap: 6px; padding: 6px 8px; border-radius: 6px; font-weight: 500; color: var(--text); }
.tree-cat:hover { background: var(--blue-light); color: var(--blue-dark); }
.tree-item { display: flex; align-items: center; gap: 6px; padding: 5px 8px; border-radius: 6px; color: var(--text-muted); font-size: 13px; }
.tree-item:hover { background: var(--blue-light); color: var(--blue-dark); }
.t-ico { width: 14px; height: 14px; flex-shrink: 0; }
.ico-folder { background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%23f59e0b"><path d="M10 4H4a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2V8a2 2 0 0 0-2-2h-8l-2-2z"/></svg>') no-repeat center/contain; }
.ico-doc { background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%2322c55e"><path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8l-6-6zm-1 7V3.5L18.5 9H13z"/></svg>') no-repeat center/contain; }
.ico-link { background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%238b5cf6"><path d="M3.9 12c0-1.7 1.4-3.1 3.1-3.1h4V7H7a5 5 0 0 0 0 10h4v-1.9H7c-1.7 0-3.1-1.4-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.7 0 3.1 1.4 3.1 3.1s-1.4 3.1-3.1 3.1h-4V17h4a5 5 0 0 0 0-10z"/></svg>') no-repeat center/contain; }

/* 主内容 */
.main { flex: 1; min-width: 0; }

/* Hero */
.hero { background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%); border-radius: 14px; color: #fff; padding: 40px 32px; text-align: center; }
.hero-title { font-size: 28px; font-weight: 700; }
.hero-sub { margin-top: 8px; color: rgba(255,255,255,.9); font-size: 15px; }

/* 区块 */
.section { margin-top: 24px; }
.section-title { font-size: 16px; font-weight: 600; margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.section-title::before { content: ""; width: 4px; height: 16px; background: var(--blue); border-radius: 2px; }

/* 卡片网格（每行最多 4 个，窄屏 2 个，手机 1 个） */
.card-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
@media (max-width: 1100px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .card-grid { grid-template-columns: 1fr; gap: 10px; } }
.card { background: var(--white); border: 1px solid var(--border); border-radius: 10px; padding: 18px 16px; display: flex; flex-direction: column; gap: 8px; color: var(--text); transition: box-shadow .15s, transform .15s, border-color .15s; }
.card:hover { border-color: var(--blue); box-shadow: 0 4px 14px rgba(37,99,235,.14); transform: translateY(-2px); }
.card-ico { width: 30px; height: 30px; }
.ico-folder-lg { background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%23f59e0b"><path d="M10 4H4a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2V8a2 2 0 0 0-2-2h-8l-2-2z"/></svg>') no-repeat center/contain; }
.ico-doc-lg { background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%2322c55e"><path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8l-6-6zm-1 7V3.5L18.5 9H13z"/></svg>') no-repeat center/contain; }
.ico-link-lg { background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%238b5cf6"><path d="M3.9 12c0-1.7 1.4-3.1 3.1-3.1h4V7H7a5 5 0 0 0 0 10h4v-1.9H7c-1.7 0-3.1-1.4-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.7 0 3.1 1.4 3.1 3.1s-1.4 3.1-3.1 3.1h-4V17h4a5 5 0 0 0 0-10z"/></svg>') no-repeat center/contain; }
.card-name { font-weight: 600; font-size: 15px; }
.card-meta { font-size: 12px; color: var(--text-muted); }

/* 页面头部与面包屑 */
.page-head { margin-bottom: 8px; }
.page-title { font-size: 22px; font-weight: 700; margin-top: 6px; }
.breadcrumb { font-size: 13px; color: var(--text-muted); }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--blue); }
.bc-sep { margin: 0 4px; color: #cbd5e1; }
.bc-current { color: var(--text); }

/* 文章正文 */
.rich-content { background: var(--white); border: 1px solid var(--border); border-radius: 10px; padding: 28px 32px; margin-top: 16px; }
.rich-content h2 { font-size: 20px; margin: 18px 0 10px; padding-bottom: 6px; border-bottom: 1px solid var(--border); }
.rich-content h3 { font-size: 17px; margin: 14px 0 8px; }
.rich-content p { margin: 8px 0; }
.rich-content ul, .rich-content ol { margin: 8px 0 8px 24px; }
.rich-content img { max-width: 100%; border-radius: 6px; }
.rich-content a { color: var(--blue); text-decoration: underline; }
.rich-content code { background: #f1f5f9; padding: 2px 6px; border-radius: 4px; font-size: 13px; }
.rich-content pre { background: #0f172a; color: #e2e8f0; padding: 14px; border-radius: 8px; overflow-x: auto; margin: 10px 0; }

/* 链接详情 */
.link-desc { margin: 10px 0 16px; color: var(--text-muted); }
.url-list { display: flex; flex-direction: column; gap: 10px; }
.url-row { display: flex; align-items: center; gap: 12px; background: var(--white); border: 1px solid var(--border); border-radius: 10px; padding: 12px 16px; }
.url-label { flex-shrink: 0; background: var(--blue-light); color: var(--blue-dark); font-size: 12px; font-weight: 600; padding: 3px 10px; border-radius: 20px; }
.url-text { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text); }
.url-actions { flex-shrink: 0; display: flex; gap: 6px; }
.btn { display: inline-flex; align-items: center; justify-content: center; border: none; border-radius: 6px; cursor: pointer; font-size: 13px; padding: 5px 14px; background: var(--blue); color: #fff; }
.btn:hover { background: var(--blue-dark); color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-copy { background: var(--white); color: var(--blue); border: 1px solid var(--blue); }
.btn-copy:hover { background: var(--blue-light); color: var(--blue-dark); }
.copied { background: #22c55e !important; border-color: #22c55e !important; color: #fff !important; }

.back-link { margin-top: 20px; font-size: 13px; }
.empty-tip { color: var(--text-muted); padding: 12px 0; }

/* 页脚 */
.footer { text-align: center; color: var(--text-muted); font-size: 12px; padding: 20px; border-top: 1px solid var(--border); background: var(--white); }

/* ============ 多端适配 ============ */
/* 平板：侧栏略窄，内容间距收紧 */
@media (max-width: 1024px) {
  .layout { padding: 18px; gap: 16px; }
  .sidebar { width: 220px; }
}

/* 手机/窄屏：侧栏改为抽屉式（默认隐藏，点汉堡打开） */
@media (max-width: 900px) {
  .menu-btn { display: flex; }
  .brand-sub { display: none; }
  .topbar-inner { padding: 10px 14px; gap: 8px; }
  .brand { font-size: 16px; }
  .brand-logo { font-size: 20px; }

  .layout { padding: 12px; gap: 0; display: block; }
  .sidebar {
    position: fixed;
    top: 52px; bottom: 0; left: 0;
    width: 260px;
    max-width: 82vw;
    max-height: none;
    border-radius: 0;
    z-index: 55;
    transform: translateX(-100%);
    transition: transform .22s ease;
    overflow-y: auto;
  }
  body.sb-open .sidebar { transform: translateX(0); box-shadow: 4px 0 16px rgba(0,0,0,.18); }
  body.sb-open .overlay { display: block; }
  .sb-collapse-btn { display: none; }
  .sb-close-btn { display: inline-flex; align-items: center; justify-content: center; }
  .sb-restore { display: none !important; }

  .main { width: 100%; }
  .hero { padding: 26px 18px; }
  .hero-title { font-size: 22px; }
  .hero-sub { font-size: 14px; }
  .rich-content { padding: 18px 16px; }
  .url-row { flex-wrap: wrap; padding: 10px 12px; }
  .url-text { width: 100%; order: 3; }
  .url-actions { margin-left: auto; }
  .url-label { font-size: 11px; }
}

/* 小手机：更紧凑 */
@media (max-width: 480px) {
  .section-title { font-size: 15px; }
  .page-title { font-size: 19px; }
  .btn { padding: 5px 12px; }
}