/* ============ 设计变量 ============ */
:root{
  --bg: #F2F7FB;
  --card: #FFFFFF;
  --primary: #2F9BD6;
  --primary-soft: #E6F3FB;
  --primary-2: #5BC8C0;
  --grad: linear-gradient(135deg, #2F9BD6 0%, #5BC8C0 100%);
  --grad-soft: linear-gradient(135deg, #EAF6FD 0%, #EAFBF7 100%);
  --text: #1F2D3D;
  --sub: #5B6577;
  --muted: #8A94A6;
  --line: #E6EEF5;
  --success: #10B981;
  --success-soft: #E7F8F1;
  --danger: #EF4444;
  --danger-soft: #FDECEC;
  --warn: #F59E0B;
  --warn-soft: #FEF3E2;
  --radius-card: 20px;
  --radius-btn: 14px;
  --radius-pill: 999px;
  --shadow-1: 0 4px 14px -6px rgba(15,27,45,0.08);
  --shadow-2: 0 12px 28px -8px rgba(47,155,214,0.28);
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:"PingFang SC","Microsoft YaHei",Inter,system-ui,-apple-system,sans-serif;
  background:var(--bg);
  color:var(--text);
  font-size:14px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
/* 关键：作者样式里的 display 会覆盖 UA 的 [hidden]{display:none}，
   这里显式兜底，保证 hidden 属性真正隐藏元素（弹窗遮罩/轻提示） */
[hidden]{display:none!important}
button{font-family:inherit;cursor:pointer;border:none;background:none}
input,select,textarea{font-family:inherit;font-size:14px;color:var(--text)}

/* ============ 布局 ============ */
.app{display:flex;min-height:100vh}

.sidebar{
  width:240px;flex-shrink:0;
  background:var(--card);
  border-right:1px solid var(--line);
  display:flex;flex-direction:column;
  padding:22px 16px;position:sticky;top:0;height:100vh;
}
.brand{display:flex;align-items:center;gap:12px;padding:6px 8px 22px}
.brand-logo{
  width:42px;height:42px;border-radius:14px;background:var(--grad);
  display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-2);
}
.brand-title{font-weight:700;font-size:16px}
.brand-sub{font-size:12px;color:var(--muted)}

.nav{display:flex;flex-direction:column;gap:6px;flex:1}
.nav-item{
  display:flex;align-items:center;gap:12px;
  padding:11px 14px;border-radius:var(--radius-btn);
  color:var(--sub);font-weight:600;font-size:14px;
  transition:.18s;text-align:left;width:100%;
}
.nav-item svg{flex-shrink:0;color:var(--muted);transition:.18s}
.nav-item:hover{background:var(--primary-soft);color:var(--primary)}
.nav-item.active{background:var(--grad);color:#fff;box-shadow:var(--shadow-2)}
.nav-item.active svg{color:#fff}
.sidebar-foot{margin-top:14px}
.tip{font-size:12px;color:var(--muted);background:var(--grad-soft);border-radius:14px;padding:12px 14px;line-height:1.5}

.main{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:20px 32px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.7);
  backdrop-filter:blur(8px);position:sticky;top:0;z-index:5;
}
.topbar-title{font-size:20px;font-weight:700}
.topbar-actions{display:flex;gap:10px}
.content{padding:28px 32px;max-width:1180px;width:100%;margin:0 auto}

/* ============ 通用组件 ============ */
.card{background:var(--card);border-radius:var(--radius-card);box-shadow:var(--shadow-1);padding:22px;border:1px solid var(--line)}
.card-title{font-size:15px;font-weight:700;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.card-title .ic{color:var(--primary)}

.btn{
  display:inline-flex;align-items:center;gap:7px;
  padding:10px 18px;border-radius:var(--radius-btn);font-weight:600;font-size:14px;
  background:var(--primary-soft);color:var(--primary);transition:.18s;
}
.btn:hover{background:#D6ECFA}
.btn-primary{background:var(--grad);color:#fff;box-shadow:var(--shadow-2)}
.btn-primary:hover{filter:brightness(1.05)}
.btn-ghost{background:transparent;color:var(--sub);border:1px solid var(--line)}
.btn-ghost:hover{background:var(--bg)}
.btn-danger{background:var(--danger-soft);color:var(--danger)}
.btn-danger:hover{background:#FBD9D9}
.btn-sm{padding:7px 13px;font-size:13px;border-radius:10px}
.btn:disabled{opacity:.45;cursor:not-allowed}

.pill{display:inline-flex;align-items:center;gap:5px;padding:4px 11px;border-radius:var(--radius-pill);font-size:12px;font-weight:600}
.pill-blue{background:var(--primary-soft);color:var(--primary)}
.pill-green{background:var(--success-soft);color:var(--success)}
.pill-red{background:var(--danger-soft);color:var(--danger)}
.pill-gray{background:#EEF2F7;color:var(--muted)}
.pill-warn{background:var(--warn-soft);color:var(--warn)}

input.field,select.field,textarea.field{
  width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:12px;
  background:#FBFDFE;transition:.18s;outline:none;
}
input.field:focus,select.field:focus,textarea.field:focus{border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px var(--primary-soft)}
textarea.field{resize:vertical;min-height:80px}
label.lbl{display:block;font-size:13px;font-weight:600;color:var(--sub);margin-bottom:6px}

/* ============ 概览页 ============ */
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:22px}
.stat{min-height:108px;display:flex;flex-direction:column;justify-content:center;gap:6px;position:relative;overflow:hidden}
.stat .stat-ic{position:absolute;right:16px;top:16px;opacity:.14}
.stat .stat-val{font-size:28px;font-weight:800;letter-spacing:-.5px}
.stat .stat-lab{font-size:13px;color:var(--muted)}
.stat .stat-sub{font-size:12px;color:var(--sub)}

.hero{
  background:var(--grad);border-radius:var(--radius-card);padding:26px 28px;color:#fff;
  margin-bottom:22px;display:flex;align-items:center;justify-content:space-between;gap:20px;
  box-shadow:var(--shadow-2);
}
.hero h2{font-size:20px;margin-bottom:6px}
.hero p{opacity:.92;font-size:13px}
.hero .hero-actions{display:flex;gap:10px;flex-shrink:0}

.grid-2{display:grid;grid-template-columns:1.4fr 1fr;gap:18px}
.mini-list{display:flex;flex-direction:column;gap:10px}
.mini-row{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;background:var(--bg);border-radius:12px}
.mini-row .mr-main{font-weight:600}
.mini-row .mr-sub{font-size:12px;color:var(--muted)}

.progress-bar{height:9px;background:#EDF2F7;border-radius:999px;overflow:hidden;flex:1;margin:0 12px}
.progress-bar > i{display:block;height:100%;background:var(--grad);border-radius:999px;transition:.4s}

/* ============ 题库管理 ============ */
.filter-bar{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:18px;align-items:flex-end}
.filter-bar .fg{flex:1;min-width:150px}
.q-table{width:100%;border-collapse:collapse}
.q-table th{text-align:left;font-size:12px;color:var(--muted);font-weight:600;padding:10px 12px;border-bottom:1px solid var(--line)}
.q-table td{padding:13px 12px;border-bottom:1px solid var(--line);vertical-align:top;font-size:13px}
.q-table tr:hover{background:var(--bg)}
.q-content{font-weight:600;max-width:360px}
.q-meta{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px}
.q-actions{display:flex;gap:6px}
.row-empty{padding:40px;text-align:center;color:var(--muted)}

/* ============ 练习 / 考试 答题卡 ============ */
.quiz-wrap{max-width:760px;margin:0 auto}
.quiz-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px;flex-wrap:wrap;gap:12px}
.fav-btn{width:40px;height:40px;border-radius:12px;display:flex;align-items:center;justify-content:center;color:var(--muted);background:var(--bg);border:1.5px solid var(--line);transition:.16s}
.fav-btn:hover{border-color:var(--warn);color:var(--warn)}
.fav-btn.on{color:#F59E0B;background:var(--warn-soft);border-color:#F6D79A}
.link-btn{transition:.16s}
.link-btn:hover{opacity:.75}
.quiz-progress{font-size:13px;color:var(--sub);font-weight:600}
.timer{font-weight:700;color:var(--primary);background:var(--primary-soft);padding:6px 14px;border-radius:var(--radius-pill)}

.question-card{padding:26px}
.q-tag-row{display:flex;gap:8px;margin-bottom:14px;align-items:center;flex-wrap:wrap}
.q-index{font-size:12px;color:var(--muted)}
.q-text{font-size:17px;font-weight:700;line-height:1.7;margin-bottom:20px;white-space:pre-wrap}
.options{display:flex;flex-direction:column;gap:12px}
.option{
  display:flex;align-items:flex-start;gap:12px;padding:14px 16px;border:1.5px solid var(--line);
  border-radius:14px;cursor:pointer;transition:.16s;background:#FBFDFE;
}
.option:hover{border-color:var(--primary);background:var(--primary-soft)}
.option.sel{border-color:var(--primary);background:var(--primary-soft)}
.option.correct{border-color:var(--success);background:var(--success-soft)}
.option.wrong{border-color:var(--danger);background:var(--danger-soft)}
.option .opt-mark{
  width:24px;height:24px;border-radius:50%;border:1.5px solid var(--muted);flex-shrink:0;
  display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:var(--muted);
}
.option.sel .opt-mark{border-color:var(--primary);color:var(--primary);background:#fff}
.option.correct .opt-mark{border-color:var(--success);color:var(--success);background:#fff}
.option.wrong .opt-mark{border-color:var(--danger);color:var(--danger);background:#fff}

.answer-area{margin-top:18px}
.fill-input{width:100%}

.feedback{margin-top:18px;padding:16px 18px;border-radius:14px;display:none}
.feedback.show{display:block;animation:fade .25s}
.feedback.ok{background:var(--success-soft);border:1px solid #BDEBD6}
.feedback.no{background:var(--danger-soft);border:1px solid #F6C9C9}
.feedback .fb-title{font-weight:700;margin-bottom:6px;display:flex;align-items:center;gap:8px}
.feedback.ok .fb-title{color:var(--success)}
.feedback.no .fb-title{color:var(--danger)}
.feedback .fb-exp{font-size:13px;color:var(--sub);white-space:pre-wrap}
.feedback .fb-ans{font-size:13px;font-weight:600;margin-top:8px;color:var(--text)}

.quiz-foot{display:flex;justify-content:space-between;margin-top:20px}

.self-rate{display:flex;gap:10px;margin-top:6px}

/* ============ 结果页 ============ */
.result-wrap{max-width:640px;margin:0 auto;text-align:center}
.result-score{
  width:160px;height:160px;border-radius:50%;margin:0 auto 18px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  background:var(--grad-soft);border:6px solid #fff;box-shadow:var(--shadow-2);
}
.result-score .num{font-size:46px;font-weight:800;color:var(--primary);line-height:1}
.result-score .den{font-size:13px;color:var(--muted);margin-top:4px}
.result-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0}
.result-stat{padding:16px;border-radius:14px;background:var(--bg)}
.result-stat .v{font-size:22px;font-weight:800}
.result-stat .l{font-size:12px;color:var(--muted)}

/* ============ 统计 ============ */
.bar-row{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.bar-row .bar-lab{width:120px;font-size:13px;font-weight:600;flex-shrink:0}
.bar-track{flex:1;height:14px;background:#EDF2F7;border-radius:999px;overflow:hidden}
.bar-track > i{display:block;height:100%;background:var(--grad);border-radius:999px;transition:.5s}
.bar-row .bar-val{width:64px;text-align:right;font-size:13px;font-weight:700;color:var(--sub)}

.chart{width:100%;height:240px}
.legend{display:flex;gap:18px;margin-top:12px;font-size:12px;color:var(--sub);justify-content:center}
.legend i{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:6px;vertical-align:middle}

/* ============ 弹窗 ============ */
.modal-mask{position:fixed;inset:0;background:rgba(20,30,45,.4);backdrop-filter:blur(3px);display:flex;align-items:center;justify-content:center;z-index:50;padding:20px}
.modal{background:var(--card);border-radius:var(--radius-card);width:640px;max-width:100%;max-height:90vh;overflow:auto;box-shadow:0 24px 60px -12px rgba(15,27,45,.4);animation:pop .22s}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;border-bottom:1px solid var(--line);position:sticky;top:0;background:#fff;z-index:2}
.modal-head h3{font-size:17px;font-weight:700}
.modal-close{width:32px;height:32px;border-radius:10px;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:18px}
.modal-close:hover{background:var(--bg)}
.modal-body{padding:22px 24px}
.modal-foot{padding:16px 24px;border-top:1px solid var(--line);display:flex;justify-content:flex-end;gap:10px;position:sticky;bottom:0;background:#fff}

.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-grid .full{grid-column:1/-1}
.opt-editor{display:flex;flex-direction:column;gap:8px}
.opt-line{display:flex;align-items:center;gap:8px}
.opt-line .opt-key{width:26px;height:26px;border-radius:8px;background:var(--primary-soft);color:var(--primary);font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:13px}
.opt-line .field{flex:1}
.opt-line .opt-del{color:var(--muted);width:30px;height:30px;border-radius:8px;display:flex;align-items:center;justify-content:center}
.opt-line .opt-del:hover{background:var(--danger-soft);color:var(--danger)}

/* ============ toast ============ */
.toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%);background:var(--text);color:#fff;padding:12px 22px;border-radius:var(--radius-pill);font-size:14px;font-weight:600;box-shadow:0 10px 30px -8px rgba(0,0,0,.4);z-index:99;animation:pop .2s}

/* ============ 动画 / 响应式 ============ */
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
@keyframes pop{from{opacity:0;transform:scale(.96)}to{opacity:1;transform:none}}

@media(max-width:920px){
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .grid-2{grid-template-columns:1fr}
  .content{padding:20px}
  .form-grid{grid-template-columns:1fr}
}
/* 仅在真正窄的手机屏（≤640px）才把侧边栏收成图标，避免中等宽度预览面板里文字标签被隐藏 */
@media(max-width:640px){
  .sidebar{width:72px;padding:18px 10px}
  .brand-text,.nav-item span,.tip{display:none}
  .nav-item{justify-content:center;padding:12px}
}