/* ============================================================
   LDS UI 设计系统 v2.1 · 大厂质感 · 现代教育风
   断点:<768px 手机 / 768-1024px 平板 / >1024px 桌面
   v2.1 变更:品牌渐变深色顶栏(三端统一)/Logo标识/氛围背景加强/
             卡片悬浮抬升/顶栏内文字颜色统一
   兼容:v1 全部类名与变量名保持不变,可安全覆盖
   ============================================================ */
:root {
  /* 品牌绿阶 v2(更鲜亮的翡翠绿,渐变用) */
  --brand: #0E9F6E;
  --brand-dark: #0B7A55;
  --brand-deep: #064E38;
  --brand-soft: #E3F6EE;
  --brand-softer: #F2FBF7;
  --brand-grad: linear-gradient(135deg, #10B981 0%, #0E9F6E 55%, #0B7A55 100%);
  /* 语义色 */
  --success: #12A66D;
  --success-soft: #E3F6EE;
  --warning: #F59E0B;
  --warning-dark: #92610A;
  --warning-soft: #FEF4E2;
  --danger: #EF5350;
  --danger-dark: #B23432;
  --danger-soft: #FDECEC;
  --info: #3B82F6;
  --info-soft: #EAF2FE;
  /* 中性色 v2(冷灰阶,大厂默认) */
  --bg: #F4F6F8;
  --bg-card: #FFFFFF;
  --border: #E7EBF0;
  --border-strong: #D5DCE4;
  --text: #1A202C;
  --text-2: #5D6B7A;
  --text-3: #98A4B0;
  /* 形状与层级 v2(多层海拔) */
  --radius-sm: 10px;
  --radius: 14px;
  --radius-lg: 18px;
  --shadow-sm: 0 1px 2px rgba(23, 32, 46, .05), 0 1px 3px rgba(23, 32, 46, .04);
  --shadow: 0 2px 6px rgba(23, 32, 46, .06), 0 4px 14px rgba(23, 32, 46, .05);
  --shadow-lg: 0 10px 32px rgba(23, 32, 46, .12), 0 2px 8px rgba(23, 32, 46, .06);
  --ring: 0 0 0 3px rgba(14, 159, 110, .16);
  /* 字体 */
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Segoe UI", Roboto, "Microsoft YaHei", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background:
    radial-gradient(1100px 480px at 85% -180px, rgba(14, 159, 110, .13), transparent 60%),
    radial-gradient(900px 420px at -10% 12%, rgba(59, 130, 246, .08), transparent 55%),
    radial-gradient(700px 500px at 50% 110%, rgba(16, 185, 129, .06), transparent 60%),
    var(--bg);
  background-attachment: fixed;
  color: var(--text);
  font-size: 14px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--brand); text-decoration: none; transition: color .15s; }
a:hover { color: var(--brand-dark); }
img { max-width: 100%; }

/* 数字统一等宽,仪表盘观感 */
.stat-box .value, td, .kv { font-variant-numeric: tabular-nums; }

/* ============ 自定义滚动条 ============ */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #C7D0DA; border-radius: 999px; border: 2px solid transparent; background-clip: content-box; }
::-webkit-scrollbar-thumb:hover { background: #A9B5C2; background-clip: content-box; border: 2px solid transparent; }

/* ============ 组件:按钮 v2 ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 22px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; letter-spacing: .2px; cursor: pointer; border: none;
  background: var(--brand-grad); color: #fff;
  box-shadow: 0 2px 8px rgba(14, 159, 110, .28), inset 0 1px 0 rgba(255, 255, 255, .18);
  transition: box-shadow .18s, transform .12s, filter .18s;
}
.btn:hover { filter: brightness(1.06); box-shadow: 0 4px 14px rgba(14, 159, 110, .38), inset 0 1px 0 rgba(255,255,255,.18); transform: translateY(-1px); }
.btn:active { transform: translateY(0) scale(.98); filter: brightness(.98); }
.btn:disabled { background: #CBD5E1; box-shadow: none; cursor: not-allowed; transform: none; }
.btn-secondary {
  background: #fff; color: var(--text); border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover { border-color: var(--brand); color: var(--brand-dark); background: var(--brand-softer); box-shadow: var(--shadow); }
.btn-danger { background: linear-gradient(135deg, #F4645F, #E24B4A); box-shadow: 0 2px 8px rgba(226, 75, 74, .28); }
.btn-danger:hover { box-shadow: 0 4px 14px rgba(226, 75, 74, .38); filter: brightness(1.05); }
.btn-sm { padding: 6px 14px; font-size: 12px; border-radius: 8px; }

/* ============ 组件:卡片 v2 ============ */
.card {
  background: var(--bg-card); border-radius: var(--radius-lg);
  border: 1px solid rgba(231, 235, 240, .9); box-shadow: var(--shadow-sm);
  padding: 22px; margin-bottom: 16px;
  transition: box-shadow .22s ease, transform .22s ease, border-color .22s ease;
  animation: cardIn .38s ease both;
}
.card:hover { box-shadow: var(--shadow-lg); border-color: #D3DCE5; transform: translateY(-2px); }
@keyframes cardIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .card { animation: none; } .btn, .card { transition: none; } }
.card h2 {
  font-size: 16.5px; font-weight: 700; color: var(--text); margin-bottom: 14px;
  letter-spacing: .2px; display: flex; align-items: center; gap: 8px;
}
.card h2::before {
  content: ""; width: 4px; height: 16px; border-radius: 2px; flex: 0 0 4px;
  background: var(--brand-grad);
}
.card h3 { font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--text); }
.mini-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 16px;
  transition: box-shadow .2s, border-color .2s;
}
.mini-card:hover { box-shadow: var(--shadow-sm); border-color: var(--border-strong); }
.empty-state { color: var(--text-3); font-size: 13px; text-align: center; padding: 28px 12px; }

/* 统计盒 v2:白卡+渐变数字 */
.stat-box {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; text-align: center; box-shadow: var(--shadow-sm);
  transition: transform .2s, box-shadow .2s;
}
.stat-box:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.stat-box .label { font-size: 12px; color: var(--text-3); margin-bottom: 4px; letter-spacing: .3px; }
.stat-box .value {
  font-size: 26px; font-weight: 700; line-height: 1.2;
  background: var(--brand-grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: var(--brand);
}

/* ============ 组件:表单 v2 ============ */
input, select, textarea {
  width: 100%; padding: 10px 14px; border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); font-size: 14px; font-family: var(--font);
  background: #fff; color: var(--text);
  transition: border-color .18s, box-shadow .18s, background .18s;
}
input:hover, select:hover, textarea:hover { border-color: #B9C4D0; }
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--brand); box-shadow: var(--ring); background: #fff;
}
input::placeholder, textarea::placeholder { color: var(--text-3); }
label { font-size: 12px; color: var(--text-2); display: block; margin-bottom: 5px; font-weight: 500; }

/* ============ 组件:标签/徽章 v2 ============ */
.tag, .badge, .kv {
  display: inline-block; font-size: 12px; font-weight: 500; padding: 2px 10px;
  border-radius: 999px; background: var(--brand-soft); color: var(--brand-dark);
  border: 1px solid rgba(14, 159, 110, .18);
}
.tag-weak { background: var(--danger-soft); color: var(--danger-dark); border-color: rgba(226, 75, 74, .18); }
.tag-warn { background: var(--warning-soft); color: var(--warning-dark); border-color: rgba(245, 158, 11, .2); }
.tag-info { background: var(--info-soft); color: #1D4ED8; border-color: rgba(59, 130, 246, .2); }
.kv { background: #F1F4F7; color: var(--text-2); border-color: var(--border); }

/* ============ 组件:表格 v2 ============ */
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th {
  text-align: left; font-weight: 600; color: var(--text-2); padding: 10px 12px;
  border-bottom: 1px solid var(--border); background: #F8FAFB; white-space: nowrap;
}
th:first-child { border-radius: 8px 0 0 8px; }
th:last-child { border-radius: 0 8px 8px 0; }
td { padding: 10px 12px; border-bottom: 1px solid var(--border); color: var(--text); }
tbody tr, table tr:not(:first-child) { transition: background .15s; }
tr:hover td { background: #FAFCFB; }

/* ============ 头部 v2.1:品牌渐变深色顶栏(一眼可见) ============ */
.header {
  background: linear-gradient(120deg, #064E38 0%, #0B7A55 58%, #0E9F6E 130%);
  border-bottom: none;
  box-shadow: 0 4px 18px rgba(6, 78, 56, .28), inset 0 -1px 0 rgba(255, 255, 255, .08);
  padding: 14px 22px; display: flex; justify-content: space-between; align-items: center;
  position: sticky; top: 0; z-index: 100;
  color: #fff;
}
.header h1 {
  font-size: 18px; font-weight: 700; color: #fff; letter-spacing: .4px;
  display: flex; align-items: center; gap: 10px;
}
/* 渐变Logo方块标识 */
.header h1::before {
  content: ""; width: 24px; height: 24px; border-radius: 7px; flex: 0 0 24px;
  background: linear-gradient(135deg, #34D399, #0E9F6E);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, .18), 0 2px 8px rgba(0, 0, 0, .2);
}
/* 顶栏内链接/按钮统一浅色(压过页面内联 color:#888) */
.header a, .header button { color: rgba(255, 255, 255, .88) !important; }
.header a:hover, .header button:hover { color: #fff !important; }

/* ============ 导航(管理端侧边栏)v2:暗色渐变+辉光 ============ */
.nav-item {
  padding: 10px 14px; border-radius: var(--radius-sm); cursor: pointer;
  font-size: 13px; color: var(--text-2); display: flex; align-items: center; gap: 8px;
  transition: background .18s, color .18s, box-shadow .18s;
  position: relative;
}
.nav-item:hover { background: var(--brand-soft); color: var(--brand-dark); }
.nav-item.active {
  background: var(--brand-grad); color: #fff; font-weight: 600;
  box-shadow: 0 2px 10px rgba(14, 159, 110, .35);
}
.nav-group-title { font-size: 11px; color: var(--text-3); padding: 12px 14px 4px; letter-spacing: .8px; text-transform: uppercase; }

/* 管理端布局细节(v1类名的增强,不改结构) */
.sidebar { background: linear-gradient(180deg, #171C2E 0%, #1B2236 100%) !important; }
.sidebar .nav-item { color: #AEB6CC; }
.sidebar .nav-item:hover { background: rgba(255, 255, 255, .07); color: #fff; }
.sidebar .nav-item.active { background: var(--brand-grad); color: #fff; }
.sidebar .nav-group-title { color: #5E677E; }
.topbar {
  background: linear-gradient(120deg, #064E38 0%, #0B7A55 58%, #0E9F6E 130%);
  border-bottom: none;
  box-shadow: 0 4px 18px rgba(6, 78, 56, .28);
  color: #fff;
}
.topbar a, .topbar button { color: rgba(255, 255, 255, .88) !important; }
.topbar h1, .topbar h2, .topbar .name, .topbar span { color: #fff; }

/* 聊天气泡 v2 */
.msg { border-radius: 14px; }
.msg.parent { background: var(--brand-grad) !important; box-shadow: 0 2px 8px rgba(14, 159, 110, .25); }
.msg.ai { background: #F1F5F4 !important; border: 1px solid var(--border); }

/* 进度条 v2:渐变填充+圆头 */
.attr-bar .track { background: #EBEFF3; border-radius: 999px; }
.attr-bar .fill { background: var(--brand-grad); border-radius: 999px; position: relative; }
.attr-bar .fill::after {
  content: ""; position: absolute; right: 0; top: 50%; transform: translate(50%, -50%);
  width: 6px; height: 6px; border-radius: 50%; background: #fff; box-shadow: 0 0 0 2px var(--brand);
}

/* ============ 响应式:平板(<=1024) ============ */
@media (max-width: 1024px) {
  body { font-size: 13.5px; }
  .card { padding: 18px; }
}

/* ============ 响应式:手机(<768) ============ */
@media (max-width: 767px) {
  body { font-size: 13px; }
  .header { padding: 12px 14px; }
  .header h1 { font-size: 16px; }
  .card { padding: 15px; border-radius: var(--radius); margin-bottom: 12px; }
  .card h2::before { height: 14px; }
  .btn { padding: 9px 16px; font-size: 13px; }
  .btn:hover { transform: none; }
  .nav-item { padding: 12px 10px; }
  /* 管理端侧边栏手机端:收起为顶部横向滚动条 */
  .sidebar { position: static !important; width: 100% !important; height: auto !important; background: #fff !important; }
  .sidebar nav { display: flex; flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; padding: 8px 10px; gap: 4px; }
  .nav-group { display: contents; }
  .nav-group-title { display: none; }
  .nav-item { white-space: nowrap; font-size: 12px; }
  .main { margin-left: 0 !important; padding: 12px !important; }
  /* 统计网格单列 */
  .stats-grid, .attr-grid { grid-template-columns: 1fr 1fr !important; }
  ::-webkit-scrollbar { width: 4px; height: 4px; }
}

/* ============ 响应式:桌面(>1024) 微调 ============ */
@media (min-width: 1025px) {
  .container { max-width: 920px; margin: 0 auto; }
}

/* ============ 可访问性 ============ */
:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; border-radius: 4px; }