:root{
  --primary:#00d4ff;
  --primary-dark:#0099cc;
  --primary-light:rgba(0,212,255,0.12);
  --accent:#7b2ff7;
  --bg:#0e0e24;
  --card:rgba(20,20,60,0.75);
  --card-border:rgba(100,100,255,0.2);
  --text:#e0e0ff;
  --text-muted:#8888cc;
  --border:rgba(100,100,255,0.15);
  --success:#22c55e;
  --success-light:rgba(34,197,94,0.15);
  --danger:#ff4757;
  --danger-light:rgba(255,71,87,0.15);
  --warning:#ffa502;
  --warning-light:rgba(255,165,2,0.15);
  --shadow:0 4px 6px -1px rgba(0,0,0,.3),0 2px 4px -2px rgba(0,0,0,.3);
  --shadow-lg:0 10px 15px -3px rgba(0,0,0,.4),0 4px 6px -4px rgba(0,0,0,.4);
}
*{margin:0;padding:0;box-sizing:border-box;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:linear-gradient(135deg,#0a0a1a 0%,#1a1a3a 50%,#0a0a2a 100%);
  color:var(--text);
  min-height:100vh;
  line-height:1.6;
}
body::before{
  content:'';
  position:fixed;
  top:0;left:0;
  width:100%;height:100%;
  background:radial-gradient(circle at 50% 50%,rgba(0,212,255,0.03) 0%,transparent 70%);
  pointer-events:none;
  z-index:0;
}
.hidden{display:none !important;}
.page-in{animation:pageIn .35s ease-out forwards;}
@keyframes pageIn{
  0%{opacity:0;transform:translateY(12px);}
  100%{opacity:1;transform:translateY(0);}
}

/* ===== 开始页 ===== */
#startPage{
  min-height:calc(100vh - 52px);
  display:flex;
  align-items:center;
  justify-content:center;
  padding:20px;
}
.start-card{
  background:var(--card);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border:1px solid var(--card-border);
  border-radius:24px;
  box-shadow:var(--shadow-lg);
  padding:48px 40px;
  max-width:640px;
  width:100%;
  text-align:center;
}
.start-icon{
  font-size:64px;
  margin-bottom:16px;
}
.start-card h1{
  font-size:28px;
  color:var(--primary-dark);
  margin-bottom:12px;
}
.start-card .subtitle{
  color:var(--text-muted);
  font-size:15px;
  margin-bottom:28px;
}
.info-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:12px;
  margin-bottom:28px;
}
.info-box{
  background:var(--primary-light);
  border-radius:12px;
  padding:16px 8px;
}
.info-box .num{font-size:24px;font-weight:700;color:var(--primary-dark);}
.info-box .lbl{font-size:12px;color:var(--text-muted);margin-top:4px;}
.chapter-list{
  text-align:left;
  background:rgba(15,15,40,0.5);
  border:1px solid var(--border);
  border-radius:12px;
  padding:20px;
  margin-bottom:28px;
}
.chapter-list h3{font-size:14px;color:var(--text-muted);margin-bottom:10px;}
.chapter-list ul{list-style:none;}
.chapter-list li{
  padding:6px 0;
  font-size:14px;
  border-bottom:1px solid var(--border);
  display:flex;
  justify-content:space-between;
}
.chapter-list li:last-child{border-bottom:none;}
.chapter-list li .cnt{color:var(--primary);font-weight:600;}
.btn-primary{
  background:linear-gradient(135deg,var(--primary),var(--accent));
  color:#fff;
  border:none;
  padding:16px 48px;
  border-radius:12px;
  font-size:17px;
  font-weight:600;
  cursor:pointer;
  box-shadow:var(--shadow);
  transition:all .2s;
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}
.btn-primary:active{transform:translateY(0);}

/* ===== 答题页 ===== */
#quizPage{
  min-height:100vh;
  padding:0;
}
.quiz-header{
  background:var(--card);
  box-shadow:var(--shadow);
  padding:14px 24px;
  position:sticky;
  top:0;
  z-index:100;
}
.progress-bar-wrap{
  background:var(--border);
  height:6px;
  border-radius:3px;
  overflow:hidden;
  margin-bottom:8px;
}
.progress-bar{
  height:100%;
  background:linear-gradient(90deg,var(--primary),var(--accent));
  border-radius:3px;
  transition:width .3s;
}
.quiz-meta{
  display:flex;
  justify-content:space-between;
  align-items:center;
  font-size:13px;
  color:var(--text-muted);
}
.quiz-meta .chapter-tag{
  background:var(--primary-light);
  color:var(--primary-dark);
  padding:2px 10px;
  border-radius:10px;
  font-size:12px;
  font-weight:600;
}
.btn-exit{
  background:rgba(255,71,87,0.1);
  border:1.5px solid var(--danger);
  color:var(--danger);
  padding:5px 14px;
  border-radius:6px;
  font-size:13px;
  font-weight:600;
  cursor:pointer;
  transition:all .15s;
  display:inline-flex;
  align-items:center;
  gap:4px;
}
.btn-exit::before{content:'✕';font-size:12px;}
.btn-exit:hover{
  background:var(--danger);
  border-color:var(--danger);
  color:#fff;
}
#aviationBackToTop{
  position:fixed;bottom:30px;right:30px;
  width:44px;height:44px;
  border-radius:50%;
  background:var(--card);
  border:1.5px solid var(--border);
  color:var(--primary);
  font-size:22px;
  cursor:pointer;
  z-index:9999;
  display:flex;
  align-items:center;
  justify-content:center;
  transition:all .25s;
  box-shadow:var(--shadow);
}
#aviationBackToTop:hover{
  background:var(--primary-light);
  border-color:var(--primary);
  transform:translateY(-3px);
  box-shadow:0 6px 20px rgba(0,212,255,0.2);
}
.quiz-body{
  max-width:760px;
  margin:0 auto;
  padding:28px 20px 120px;
}
.q-number{
  font-size:13px;
  color:var(--accent);
  font-weight:700;
  letter-spacing:1px;
  margin-bottom:8px;
}
.q-text{
  font-size:18px;
  font-weight:600;
  margin-bottom:20px;
  line-height:1.5;
}
.q-trap{
  display:inline-block;
  background:var(--warning-light);
  color:var(--warning);
  font-size:12px;
  padding:2px 8px;
  border-radius:6px;
  margin-left:6px;
  font-weight:600;
  vertical-align:middle;
}
.mark-btn{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(255,165,2,0.1);
  border:2px solid rgba(255,165,2,0.35);
  color:#ffa502;padding:6px 18px 6px 12px;border-radius:20px;
  font-size:14px;font-weight:700;cursor:pointer;transition:all .2s;
  flex-shrink:0;letter-spacing:0.3px;margin-left:auto;
  box-shadow:0 0 6px rgba(255,165,2,0.08);
}
.mark-btn:hover{background:rgba(255,165,2,0.2);border-color:#ffa502;box-shadow:0 0 20px rgba(255,165,2,0.25);transform:scale(1.03);}
.mark-btn.marked{background:rgba(255,165,2,0.22);border-color:#ffa502;box-shadow:0 0 24px rgba(255,165,2,0.35);}
.mark-btn .star{font-size:22px;line-height:1;}
.mark-btn .mark-label{font-size:14px;}
.mark-btn.pop{animation:markPop .3s ease;}
@keyframes markPop{0%{transform:scale(1)}50%{transform:scale(1.12)}100%{transform:scale(1)}}
.q-header{display:flex;align-items:center;gap:12px;flex-wrap:wrap;scroll-margin-top:100px;}
.options{display:flex;flex-direction:column;gap:12px;}
.option{
  background:var(--card);
  border:2px solid var(--border);
  border-radius:12px;
  padding:14px 18px;
  cursor:pointer;
  transition:all .15s;
  display:flex;
  align-items:center;
  gap:12px;
  font-size:15px;
}
.option:hover{border-color:var(--primary);background:var(--primary-light);}
.option.selected{
  border-color:var(--primary);
  background:var(--primary-light);
}
.option .opt-label{
  width:30px;height:30px;
  border-radius:50%;
  background:var(--border);
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:14px;
  flex-shrink:0;
  transition:all .15s;
}
.option.selected .opt-label{background:var(--primary);color:#fff;}
.quiz-nav{
  display:flex;
  justify-content:space-between;
  margin-top:28px;
  gap:12px;
}
.btn-nav{
  background:var(--card);
  border:2px solid var(--border);
  color:var(--text);
  padding:12px 28px;
  border-radius:10px;
  font-size:15px;
  font-weight:600;
  cursor:pointer;
  transition:all .15s;
}
.btn-nav:hover:not(:disabled){border-color:var(--primary);color:var(--primary);}
.btn-nav:disabled{opacity:.4;cursor:not-allowed;}
.btn-nav.submit-btn{
  background:linear-gradient(135deg,#16a34a,#22c55e);
  color:#fff;border-color:transparent;
}
.question-grid{
  max-width:760px;
  margin:16px auto 0;
  padding:0 20px;
  display:flex;
  flex-wrap:wrap;
  gap:6px;
}
.q-dot{
  width:32px;height:32px;
  border-radius:8px;
  border:1px solid var(--border);
  background:var(--card);
  font-size:12px;
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;
  transition:all .15s;
}
.q-dot.answered{background:var(--primary);color:#fff;border-color:var(--primary);}
.q-dot.current{box-shadow:0 0 0 3px var(--primary-light);border-color:var(--primary);}

/* ===== 结果页 ===== */
#resultPage{
  min-height:calc(100vh - 52px);
  padding:32px 20px;
}
.result-container{max-width:880px;margin:0 auto;}
.result-card{
  background:var(--card);
  border-radius:24px;
  box-shadow:var(--shadow-lg);
  padding:40px;
  text-align:center;
  margin-bottom:24px;
}
.score-circle{
  width:160px;height:160px;
  border-radius:50%;
  margin:0 auto 20px;
  display:flex;flex-direction:column;
  align-items:center;justify-content:center;
  position:relative;
  animation:scorePop .5s cubic-bezier(0.34,1.56,0.64,1) forwards;
  opacity:0;transform:scale(0.5);
}
@keyframes scorePop{
  0%{opacity:0;transform:scale(0.5);}
  100%{opacity:1;transform:scale(1);}
}
.score-circle::before{
  content:"";
  position:absolute;inset:0;
  border-radius:50%;
  background:conic-gradient(var(--primary) var(--pct),var(--border) 0);
}
.score-circle::after{
  content:"";
  position:absolute;inset:12px;
  border-radius:50%;
  background:var(--card);
}
.score-circle .score-val{position:relative;z-index:1;font-size:42px;font-weight:800;color:var(--primary-dark);}
.score-circle .score-max{position:relative;z-index:1;font-size:14px;color:var(--text-muted);}
.result-card h2{font-size:24px;margin-bottom:8px;}
.result-msg{color:var(--text-muted);font-size:15px;margin-bottom:24px;}
.auto-mark-msg{
  font-size:12px; color:var(--text-muted); text-align:center;
  margin:4px 0 0 0; min-height:18px;
}
.result-stats{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:12px;
  margin-bottom:24px;
}
.stat-box{
  background:rgba(15,15,40,0.5);
  border:1px solid var(--border);
  border-radius:12px;
  padding:14px 8px;
}
.stat-box .val{font-size:22px;font-weight:700;}
.stat-box .lbl{font-size:12px;color:var(--text-muted);margin-top:2px;}
.stat-box.correct .val{color:var(--success);}
.stat-box.wrong .val{color:var(--danger);}
.stat-box.skipped .val{color:var(--text-muted);}
.stat-box.time .val{color:var(--accent);}
.result-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;}

.review-section{
  background:var(--card);
  border-radius:20px;
  box-shadow:var(--shadow);
  padding:28px;
  margin-bottom:24px;
}
.review-section h3{font-size:18px;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--border);}
.review-filter{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap;}
.filter-btn{
  border:1px solid var(--border);
  background:var(--card);
  padding:6px 16px;
  border-radius:20px;
  font-size:13px;
  cursor:pointer;
  transition:all .15s;
}
.filter-btn.active{background:var(--primary);color:#fff;border-color:var(--primary);}
.filter-btn:hover:not(.active){border-color:var(--primary);color:var(--primary);}
.review-item{
  border:1px solid var(--border);
  border-radius:14px;
  padding:18px;
  margin-bottom:14px;
}
.review-item.wrong{border-left:4px solid var(--danger);background:rgba(255,71,87,0.06);}
.review-item.correct{border-left:4px solid var(--success);background:rgba(34,197,94,0.06);}
.review-item.skipped{border-left:4px solid var(--text-muted);background:rgba(15,15,40,0.4);}
.review-q{font-weight:600;margin-bottom:12px;font-size:15px;}
.review-q .tag{
  font-size:11px;padding:1px 8px;border-radius:8px;margin-right:6px;font-weight:600;
}
.review-options{display:flex;flex-direction:column;gap:6px;margin-bottom:12px;}
.review-opt{
  padding:8px 12px;border-radius:8px;font-size:14px;
  display:flex;align-items:center;gap:8px;
}
.review-opt.correct-opt{background:var(--success-light);color:var(--success);font-weight:600;}
.review-opt.user-wrong{background:var(--danger-light);color:var(--danger);text-decoration:line-through;}
.review-opt.user-right{background:var(--success-light);color:var(--success);font-weight:600;}
.review-explain{
  background:rgba(0,212,255,0.06);
  border-radius:8px;
  padding:10px 14px;
  font-size:13px;
  color:var(--text);
  line-height:1.6;
}
.review-explain .label{font-weight:700;}
.review-item.marked-review{border:2px solid var(--warning);}
.review-mark-btn{
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(255,165,2,0.1);
  border:1.5px solid rgba(255,165,2,0.35);
  color:#ffa502;padding:6px 18px 6px 12px;border-radius:20px;
  font-size:13px;font-weight:700;cursor:pointer;transition:all .2s;float:right;
}
.review-mark-btn:hover{background:rgba(255,165,2,0.2);border-color:#ffa502;box-shadow:0 0 16px rgba(255,165,2,0.2);}
.review-mark-btn.marked{background:rgba(255,165,2,0.22);border-color:#ffa502;box-shadow:0 0 20px rgba(255,165,2,0.3);}
.review-mark-btn .star{font-size:20px;line-height:1;}
.mark-tag{
  display:inline-block;background:rgba(255,165,2,0.12);color:#ffa502;
  font-size:13px;padding:2px 10px;border-radius:6px;margin-right:6px;font-weight:600;vertical-align:middle;
}

/* ===== 趋势图 ===== */
.trend-section{
  background:var(--card);
  border-radius:20px;
  box-shadow:var(--shadow);
  padding:28px;
  margin-bottom:24px;
}
.trend-section h3{
  font-size:18px;margin-bottom:6px;
  display:flex;align-items:center;gap:8px;
}
.trend-section .trend-sub{font-size:13px;color:var(--text-muted);margin-bottom:18px;}
.trend-stats-row{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:12px;
  margin-bottom:20px;
}
.trend-stat{
  background:rgba(15,15,40,0.5);
  border:1px solid var(--border);
  border-radius:12px;
  padding:14px 10px;
  text-align:center;
}
.trend-stat .val{font-size:22px;font-weight:700;}
.trend-stat .lbl{font-size:11px;color:var(--text-muted);margin-top:2px;}
.trend-stat.best .val{color:var(--success);}
.trend-stat.avg .val{color:var(--accent);}
.trend-stat.latest .val{color:var(--primary);}
.trend-stat.attempts .val{color:var(--warning);}
#trendChart,#startTrendChart{
  width:100%;
  height:260px;
  display:block;
}
.trend-empty{
  text-align:center;
  padding:40px 20px;
  color:var(--text-muted);
  font-size:14px;
}
.trend-empty .icon{font-size:48px;margin-bottom:12px;}
.trend-history{
  margin-top:16px;
  max-height:200px;
  overflow-y:auto;
}
.trend-history table{
  width:100%;
  border-collapse:collapse;
  font-size:13px;
}
.trend-history th{
  text-align:left;
  padding:8px 10px;
  background:rgba(20,20,60,0.8);
  color:var(--text);
  font-weight:600;
  position:sticky;
  top:0;
}
.trend-history td{
  padding:8px 10px;
  border-bottom:1px solid var(--border);
}
.trend-history tr:hover td{background:rgba(15,15,40,0.6);}
.score-badge{
  display:inline-block;
  padding:2px 10px;
  border-radius:10px;
  font-weight:700;
  font-size:12px;
}
.score-badge.high{background:var(--success-light);color:var(--success);}
.score-badge.mid{background:var(--warning-light);color:var(--warning);}
.score-badge.low{background:var(--danger-light);color:var(--danger);}
.clear-history-btn{
  border:1px solid var(--border);
  background:var(--card);
  color:var(--danger);
  padding:6px 16px;
  border-radius:20px;
  font-size:12px;
  cursor:pointer;
  transition:all .15s;
  margin-top:12px;
}
.clear-history-btn:hover{background:var(--danger-light);border-color:var(--danger);}
.delta-arrow{
  font-size:12px;
  font-weight:700;
  margin-left:4px;
}
.delta-arrow.up{color:var(--success);}
.delta-arrow.down{color:var(--danger);}
.delta-arrow.flat{color:var(--text-muted);}

/* ===== 章节选择 ===== */
.chapter-select{text-align:left;margin-bottom:28px;}
.chapter-select h3{font-size:14px;color:var(--text-muted);margin-bottom:12px;}
.chap-buttons{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:10px;
  max-height:380px;
  overflow-y:auto;
  padding-right:4px;
}
.chap-btn{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:8px;
  background:rgba(15,15,40,0.5);
  border:1px solid var(--border);
  border-radius:12px;
  padding:12px 16px;
  cursor:pointer;
  transition:all .25s cubic-bezier(0.25,0.46,0.45,0.94);
  font-size:14px;
  text-align:left;
  font-family:inherit;
  color:var(--text);
}
.chap-btn:hover{border-color:var(--primary);background:var(--primary-light);transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,212,255,0.1);}
.chap-btn .chap-name{color:var(--text);font-weight:600;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.chap-btn .chap-cnt{color:var(--primary);font-weight:700;font-size:12px;flex-shrink:0;white-space:nowrap;}
.chap-btn.chap-all{
  grid-column:1/-1;
  background:linear-gradient(135deg,var(--primary-light),rgba(123,47,247,0.12));
  border-color:var(--primary);
}
.chap-btn.chap-all:hover{box-shadow:0 6px 24px rgba(0,212,255,0.2);}
.chap-btn.chap-all .chap-name{color:var(--primary);font-weight:700;font-size:15px;}
.chap-btn.chap-all .chap-cnt{font-size:14px;}

/* ===== 答题页侧边栏布局 ===== */
.quiz-layout{display:flex;min-height:100vh;}
.quiz-sidebar{
  width:220px;
  flex-shrink:0;
  background:rgba(15,15,40,0.6);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  border-right:1px solid var(--border);
  padding:16px 12px;
  overflow-y:auto;
  position:sticky;
  top:52px;
  max-height:calc(100vh - 52px);
  z-index:50;
}
.quiz-sidebar h4{
  font-size:12px;
  color:var(--text-muted);
  margin-bottom:10px;
  padding-bottom:8px;
  border-bottom:1px solid var(--border);
  display:flex;
  justify-content:space-between;
  align-items:center;
}
.quiz-sidebar h4 .sidebar-count{
  background:var(--primary-light);
  color:var(--primary-dark);
  padding:1px 8px;
  border-radius:8px;
  font-size:11px;
  font-weight:700;
}
.sidebar-grid{
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:5px;
}
.sidebar-dot{
  aspect-ratio:1;
  border-radius:8px;
  border:1px solid var(--border);
  background:var(--card);
  font-size:11px;
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;
  transition:all .15s;
  font-weight:600;
  color:var(--text-muted);
}
.sidebar-dot:hover{border-color:var(--primary);}
.sidebar-dot.marked::after{
  content:"⭐";
  position:absolute;top:-6px;right:-6px;
  font-size:12px;line-height:1;
}
.sidebar-dot{position:relative;}
.sidebar-dot.answered{background:var(--primary);color:#fff;border-color:var(--primary);}
.sidebar-dot.current{box-shadow:0 0 0 3px var(--primary-light);border-color:var(--primary);transform:scale(1.08);}
.quiz-main{flex:1;min-width:0;display:flex;flex-direction:column;}
.quiz-main .quiz-header{position:sticky;top:52px;z-index:40;}
.quiz-main .quiz-body{max-width:720px;margin:0 auto;padding:28px 24px 120px;flex:1;}

@media(max-width:900px){
  .quiz-sidebar{width:160px;padding:12px 8px;}
  .sidebar-grid{grid-template-columns:repeat(4,1fr);}
  .quiz-main .quiz-body{padding:20px 16px 100px;}
}
@media(max-width:600px){
  .start-card{padding:32px 20px;}
  .info-grid{grid-template-columns:1fr;}
  .auto-mark-msg{
  font-size:12px; color:var(--text-muted); text-align:center;
  margin:4px 0 0 0; min-height:18px;
}
.result-stats{grid-template-columns:repeat(2,1fr);}
  .result-card,.review-section{padding:20px;}
  .q-text{font-size:16px;}
  .chap-buttons{grid-template-columns:1fr;}
  .quiz-layout{flex-direction:column;}
  .quiz-sidebar{
    width:100%;
    max-height:none;
    position:relative;
    box-shadow:0 2px 8px rgba(0,0,0,.06);
    padding:10px 12px;
  }
  .sidebar-grid{grid-template-columns:repeat(10,1fr);}
  .quiz-main .quiz-body{padding:16px 14px 100px;}
}

/* ===== 管理员面板 ===== */
.admin-page{
  max-width:900px;
  margin:80px auto 40px;
  padding:0 20px;
}
.admin-header{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:24px;
}
.admin-header h2{font-size:22px;color:var(--primary-dark);}
.admin-header .admin-info{font-size:13px;color:var(--text-muted);}
.admin-stats{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(180px,1fr));
  gap:16px;
  margin-bottom:28px;
}
.admin-stat-card{
  background:var(--card);
  border-radius:14px;
  padding:20px;
  box-shadow:var(--shadow);
  text-align:center;
}
.admin-stat-card .val{font-size:32px;font-weight:800;color:var(--primary);}
.admin-stat-card .lbl{font-size:13px;color:var(--text-muted);margin-top:4px;}
.admin-search{
  background:var(--card);
  border-radius:14px;
  padding:16px 20px;
  box-shadow:var(--shadow);
  margin-bottom:20px;
  display:flex;
  gap:12px;
  align-items:center;
}
.admin-search input{
  flex:1;
  padding:10px 16px;
  border:2px solid var(--border);
  border-radius:10px;
  font-size:14px;
  outline:none;
  font-family:inherit;
}
.admin-search input:focus{border-color:var(--primary);}
.admin-user-card{
  background:var(--card);
  border-radius:14px;
  box-shadow:var(--shadow);
  margin-bottom:16px;
  overflow:hidden;
}
.admin-user-header{
  padding:16px 20px;
  background:linear-gradient(135deg,var(--primary-light),rgba(15,15,40,0.6));
  display:flex;
  justify-content:space-between;
  align-items:center;
  cursor:pointer;
  transition:background .15s;
}
.admin-user-header:hover{opacity:.9;}
.admin-user-header .phone{font-weight:700;font-size:15px;color:var(--primary-dark);}
.admin-user-header .count{font-size:13px;color:var(--text-muted);}
.admin-user-header .arrow{font-size:18px;color:var(--primary);transition:transform .2s;}
.admin-user-header .arrow.open{transform:rotate(180deg);}
.admin-user-body{
  max-height:0;
  overflow:hidden;
  transition:max-height .3s ease;
}
.admin-user-body.open{max-height:2000px;}
.admin-history-table{
  width:100%;
  border-collapse:collapse;
  font-size:13px;
}
.admin-history-table th{
  background:var(--bg);
  padding:10px 12px;
  text-align:left;
  font-weight:600;
  color:var(--text-muted);
  font-size:12px;
  border-bottom:2px solid var(--border);
}
.admin-history-table td{
  padding:10px 12px;
  border-bottom:1px solid var(--border);
  vertical-align:middle;
}
.admin-history-table tr:hover td{background:var(--primary-light);}
.admin-score-badge{
  display:inline-block;
  padding:2px 10px;
  border-radius:20px;
  font-weight:700;
  font-size:13px;
}
.admin-score-badge.high{background:var(--success-light);color:var(--success);}
.admin-score-badge.mid{background:var(--warning-light);color:var(--warning);}
.admin-score-badge.low{background:var(--danger-light);color:var(--danger);}
.admin-empty{
  text-align:center;
  padding:60px 20px;
  color:var(--text-muted);
  font-size:15px;
}

/* ===== 顶部导航 ===== */
  .lg-navbar {
    position:sticky; top:0; left:0; right:0;
    z-index:9999;
    background:rgba(10,10,30,0.9);
    backdrop-filter:blur(12px);
    -webkit-backdrop-filter:blur(12px);
    border-bottom:1px solid rgba(100,100,255,0.12);
    padding:0 24px;
    height:52px;
    display:flex;
    align-items:center;
    gap:24px;
  }
  .lg-navbar .nav-logo {
    font-size:18px; font-weight:800;
    background:linear-gradient(90deg,var(--primary),var(--accent));
    -webkit-background-clip:text;
    -webkit-text-fill-color:transparent;
    background-clip:text;
    letter-spacing:2px;
    text-decoration:none;
    margin-right:auto;
  }
  .lg-navbar .nav-links { display:flex; gap:16px; align-items:center; }
  .lg-navbar .nav-links a {
    color:#8888cc; font-size:13px; text-decoration:none;
    transition:color .2s; padding:4px 0;
  }
  .lg-navbar .nav-links a:hover { color:var(--primary); }
  .lg-navbar .nav-links a.active { color:var(--primary); font-weight:600; }
  .lg-navbar .nav-user {
    padding:5px 16px;
    background:linear-gradient(135deg,var(--accent),var(--primary));
    color:#fff; border-radius:14px;
    font-size:12px; font-weight:600; text-decoration:none;
    cursor:pointer; transition:all .2s;
  }
  .lg-navbar .nav-user:hover { box-shadow:0 0 16px rgba(0,212,255,0.4); }
  @media(max-width:600px){
    .lg-navbar { padding:0 12px; gap:10px; }
    .lg-navbar .nav-links { gap:8px; }
    .lg-navbar .nav-links a { font-size:12px; }
  }
  @media(max-width:480px){
    .lg-navbar { padding:0 8px; gap:6px; }
    .lg-navbar .nav-links { gap:4px; }
    .lg-navbar .nav-links a { font-size:11px; }
  }

/* ===== 加载状态 ===== */
.loading-overlay{
  position:fixed; top:0; left:0; width:100%; height:100%;
  background:var(--bg); z-index:99999;
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  transition:opacity .4s;
}
.loading-overlay.hidden{ opacity:0; pointer-events:none; }
.loading-spinner{
  width:40px; height:40px;
  border:3px solid var(--border);
  border-top:3px solid var(--primary);
  border-radius:50%; animation:spin .8s linear infinite;
}
@keyframes spin{ to{ transform:rotate(360deg); } }
.loading-text{ margin-top:16px; color:var(--text-muted); font-size:14px; }

/* ===== 练习模式开关 ===== */
.quiz-options{ margin-top:12px; }
.option-toggle{
  display:inline-flex; align-items:center; gap:8px;
  cursor:pointer; font-size:13px; color:var(--text-muted);
  padding:6px 12px; border-radius:8px;
  background:var(--card); border:1px solid var(--card-border);
  transition:all .2s;
}
.option-toggle:hover{ border-color:var(--primary); color:var(--text); }
.option-toggle input[type="checkbox"]{ display:none; }
.toggle-slider{
  width:36px; height:20px; border-radius:10px;
  background:var(--border); position:relative; transition:background .2s;
  flex-shrink:0;
}
.toggle-slider::after{
  content:''; position:absolute; top:2px; left:2px;
  width:16px; height:16px; border-radius:50%;
  background:#fff; transition:transform .2s;
}
.option-toggle input:checked + .toggle-slider{ background:var(--primary); }
.option-toggle input:checked + .toggle-slider::after{ transform:translateX(16px); }
.option-label{ white-space:nowrap; }
.quiz-extra-options{
  display:flex; flex-wrap:wrap; gap:8px; margin-top:10px;
}
.btn-extra{
  padding:6px 14px; border-radius:8px; border:1px solid var(--card-border);
  background:var(--card); color:var(--text); font-size:12px;
  cursor:pointer; transition:all .2s;
}
.btn-extra:hover{
  border-color:var(--primary); background:var(--primary-light); color:var(--primary);
}
.btn-extra:active{ transform:scale(0.96); }
.practice-badge{
  display:none; font-size:11px; padding:2px 8px;
  background:var(--success); color:#fff; border-radius:4px;
  vertical-align:middle; margin-left:8px;
}
.practice-badge.active{ display:inline-block; }

/* ===== 计时器 ===== */
.timer-badge{
  font-size:13px; color:var(--text-muted); margin-left:8px;
  padding:2px 8px; background:var(--card); border-radius:4px;
  border:1px solid var(--card-border);
}
.timer-badge.practice{ color:var(--success); border-color:var(--success); }

/* ===== 导出按钮 ===== */
.btn-export{
  display:inline-flex; align-items:center; gap:4px;
  padding:8px 20px; border:none; border-radius:8px;
  background:linear-gradient(135deg,var(--accent),var(--primary));
  color:#fff; font-size:14px; font-weight:600;
  cursor:pointer; transition:all .2s;
}
.btn-exit{
  display:inline-flex; align-items:center; gap:4px;
  padding:8px 20px; border:1px solid rgba(255,255,255,0.15); border-radius:8px;
  background:transparent; color:#888; font-size:14px; font-weight:500;
  cursor:pointer; transition:all .2s;
}
.btn-exit:hover{
  background:rgba(255,80,80,0.15); color:#ff6b6b; border-color:#ff6b6b;
}
.btn-export:hover{ transform:translateY(-1px); box-shadow:0 4px 12px rgba(0,212,255,0.3); }

/* ===== 返回顶部 ===== */
#aviationBackToTop{
  position:fixed; bottom:24px; right:24px; z-index:9998;
  width:44px; height:44px; border-radius:50%;
  background:linear-gradient(135deg,var(--accent),var(--primary));
  color:#fff; border:none; font-size:20px;
  cursor:pointer; transition:all .3s; box-shadow:0 4px 12px rgba(0,0,0,0.3);
  display:flex; align-items:center; justify-content:center;
}
#aviationBackToTop:hover{ transform:translateY(-3px); box-shadow:0 6px 20px rgba(0,212,255,0.3); }