/* ===== 爱刷刷 · 设计系统 ===== */
:root{
  --brand:#6366f1; --brand2:#8b5cf6; --brand3:#a855f7;
  --grad:linear-gradient(135deg,#6366f1 0%,#8b5cf6 50%,#a855f7 100%);
  --grad-soft:linear-gradient(135deg,#eef2ff 0%,#f5f3ff 100%);
  --ok:#10b981; --err:#ef4444; --warn:#f59e0b; --info:#0ea5e9;
  --ink:#1e293b; --ink2:#475569; --ink3:#94a3b8;
  --chart-axis:#94a3b8; --chart-split:#eceef3; --chart-label:#475569;
  --bg:#f6f7fb; --card:#ffffff; --line:#eceef3;
  --shadow-sm:0 2px 8px rgba(30,41,59,.06);
  --shadow:0 8px 30px rgba(30,41,59,.09);
  --shadow-lg:0 20px 50px rgba(99,102,241,.18);
  --r:18px; --r-sm:12px; --r-lg:26px;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{font-family:var(--sans);color:var(--ink);
  background:radial-gradient(1100px 560px at 88% -8%, #eceeff 0%, transparent 55%), var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;overflow-x:hidden}
#app{min-height:100%}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,textarea,select{font-family:inherit;font-size:15px;color:var(--ink);outline:none}
a{color:inherit;text-decoration:none}
::-webkit-scrollbar{width:9px;height:9px}
::-webkit-scrollbar-thumb{background:#d5d8e2;border-radius:10px}
::-webkit-scrollbar-thumb:hover{background:#c0c4d2}

/* ===== 通用元素 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--r-sm);font-size:15px;font-weight:600;
  transition:transform .18s cubic-bezier(.34,1.56,.64,1),box-shadow .18s,filter .18s,background .2s;
  white-space:nowrap;user-select:none}
.btn:active{transform:scale(.96)}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 6px 18px rgba(99,102,241,.35)}
.btn-primary:hover{filter:brightness(1.06);box-shadow:0 10px 26px rgba(99,102,241,.45);transform:translateY(-2px)}
.btn-ghost{background:#eef1f8;color:var(--ink2)}
.btn-ghost:hover{background:#e4e8f4;transform:translateY(-1px)}
.btn-danger{background:#fef2f2;color:var(--err)}
.btn-danger:hover{background:#fee2e2}
.btn-sm{padding:8px 14px;font-size:13px;border-radius:10px}
.btn-block{width:100%}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none!important;filter:none!important}

.tag{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:20px;
  font-size:12px;font-weight:600;background:#eef2ff;color:var(--brand)}
.chip{padding:6px 14px;border-radius:20px;font-size:13px;font-weight:600;
  background:#fff;border:1.5px solid var(--line);transition:.18s}
.chip.active{background:var(--grad);color:#fff;border-color:transparent;box-shadow:0 4px 12px rgba(99,102,241,.3)}
.chip:not(.active):hover{border-color:var(--brand);color:var(--brand)}

.field{margin-bottom:16px}
.field label{display:block;font-size:13px;font-weight:600;color:var(--ink2);margin-bottom:7px}
.input{width:100%;padding:13px 15px;border:1.6px solid var(--line);border-radius:var(--r-sm);
  background:#fbfbfd;transition:.18s}
.input:focus{border-color:var(--brand);background:#fff;box-shadow:0 0 0 4px rgba(99,102,241,.12)}
textarea.input{resize:vertical;min-height:80px;line-height:1.6}

/* ===== 加载 & 空状态 ===== */
.spinner{width:34px;height:34px;border:3.5px solid #e6e8f0;border-top-color:var(--brand);
  border-radius:50%;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.loading-wrap{display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:14px;padding:60px 20px;color:var(--ink3)}
.empty{text-align:center;padding:56px 20px;color:var(--ink3)}
.empty .ico{font-size:52px;margin-bottom:12px;opacity:.75}

/* ===== Toast ===== */
.toast-layer{position:fixed;top:22px;left:50%;transform:translateX(-50%);z-index:9999;
  display:flex;flex-direction:column;gap:10px;align-items:center;pointer-events:none}
.toast{padding:12px 22px;border-radius:14px;background:rgba(30,41,59,.94);color:#fff;
  font-size:14px;font-weight:600;box-shadow:var(--shadow-lg);backdrop-filter:blur(8px);
  display:flex;align-items:center;gap:9px}
.toast.ok{background:linear-gradient(135deg,#059669,#10b981)}
.toast.err{background:linear-gradient(135deg,#dc2626,#ef4444)}
.toast-enter-active{animation:toastIn .35s cubic-bezier(.34,1.56,.64,1)}
.toast-leave-active{animation:toastIn .3s reverse}
@keyframes toastIn{from{opacity:0;transform:translateY(-18px) scale(.9)}to{opacity:1;transform:none}}

/* ===== 登录页 ===== */
.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;
  padding:24px;position:relative;overflow:hidden;background:var(--grad)}
.auth-page .blob{position:absolute;border-radius:50%;filter:blur(60px);opacity:.55;animation:float 9s ease-in-out infinite}
.blob.b1{width:420px;height:420px;background:#a855f7;top:-120px;left:-80px}
.blob.b2{width:360px;height:360px;background:#6366f1;bottom:-120px;right:-60px;animation-delay:-3s}
.blob.b3{width:260px;height:260px;background:#ec4899;top:40%;right:20%;animation-delay:-5s;opacity:.4}
@keyframes float{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(24px,-30px) scale(1.08)}}
.auth-card{position:relative;z-index:2;width:100%;max-width:420px;background:rgba(255,255,255,.98);
  border-radius:var(--r-lg);padding:40px 34px;box-shadow:0 30px 70px rgba(20,10,60,.4);
  animation:cardUp .6s cubic-bezier(.22,1,.36,1)}
@keyframes cardUp{from{opacity:0;transform:translateY(34px)}to{opacity:1;transform:none}}
.auth-logo{text-align:center;margin-bottom:26px}
.auth-logo .mark{width:66px;height:66px;border-radius:20px;background:var(--grad);
  display:inline-flex;align-items:center;justify-content:center;font-size:34px;
  box-shadow:0 10px 26px rgba(99,102,241,.5);margin-bottom:12px;animation:pop .5s .1s both cubic-bezier(.34,1.56,.64,1)}
@keyframes pop{from{transform:scale(0) rotate(-25deg)}to{transform:none}}
.auth-logo h1{font-size:25px;font-weight:800;letter-spacing:.5px}
.auth-logo p{color:var(--ink3);font-size:13.5px;margin-top:2px}
.auth-tabs{display:flex;background:#f0f1f7;border-radius:14px;padding:5px;margin-bottom:24px;position:relative}
.auth-tabs button{flex:1;padding:10px;border-radius:10px;font-weight:700;font-size:14.5px;
  color:var(--ink3);position:relative;z-index:2;transition:color .25s}
.auth-tabs button.active{color:var(--brand)}
.auth-tabs .slider{position:absolute;top:5px;bottom:5px;width:calc(50% - 5px);background:#fff;
  border-radius:10px;box-shadow:var(--shadow-sm);transition:transform .3s cubic-bezier(.34,1.4,.64,1)}
.auth-hint{text-align:center;font-size:12.5px;color:var(--ink3);margin-top:18px}
.auth-hint b{color:var(--brand)}

/* ===== 顶栏 (学生) ===== */
.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);padding:0 20px}
.topbar-in{max-width:1120px;margin:0 auto;height:62px;display:flex;align-items:center;gap:14px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px}
.brand .mark{width:38px;height:38px;border-radius:11px;background:var(--grad);display:flex;
  align-items:center;justify-content:center;font-size:20px;box-shadow:0 4px 12px rgba(99,102,241,.4)}
.brand .mark.sm{width:32px;height:32px;font-size:17px;border-radius:9px}
.top-nav{display:flex;gap:4px;margin-left:14px}
.top-nav a{padding:8px 15px;border-radius:11px;font-size:14.5px;font-weight:600;color:var(--ink2);transition:.18s}
.top-nav a:hover{background:#f1f2f8;color:var(--ink)}
.top-nav a.on{background:#eef2ff;color:var(--brand)}
.top-spacer{flex:1}
.user-pill{display:flex;align-items:center;gap:9px;padding:5px 6px 5px 14px;border-radius:30px;
  background:#f4f5fa;transition:.18s}
.user-pill:hover{background:#eceef6}
.user-pill .nm{font-size:14px;font-weight:600;max-width:90px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--grad);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;flex-shrink:0}

.container{max-width:1120px;margin:0 auto;padding:26px 20px 90px}
.page-head{margin-bottom:22px}
.page-head h2{font-size:26px;font-weight:800;letter-spacing:.3px}
.page-head p{color:var(--ink3);margin-top:3px;font-size:14.5px}

/* ===== 科目卡片网格 ===== */
.subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px}
.subj-card{position:relative;background:var(--card);border-radius:var(--r);padding:22px;
  box-shadow:var(--shadow-sm);border:1px solid var(--line);overflow:hidden;cursor:pointer;
  transition:transform .25s cubic-bezier(.34,1.3,.64,1),box-shadow .25s;
  animation:fadeUp .5s both}
.subj-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.subj-card .glow{position:absolute;top:-40px;right:-40px;width:130px;height:130px;border-radius:50%;
  opacity:.14;transition:.3s}
.subj-card:hover .glow{opacity:.24;transform:scale(1.2)}
.subj-ico{width:56px;height:56px;border-radius:16px;display:flex;align-items:center;justify-content:center;
  font-size:28px;color:#fff;margin-bottom:14px;box-shadow:var(--shadow-sm)}
.subj-card h3{font-size:18px;font-weight:800;margin-bottom:6px}
.subj-meta{display:flex;align-items:center;gap:8px;color:var(--ink3);font-size:13px}
.subj-foot{display:flex;align-items:center;justify-content:space-between;margin-top:18px;
  padding-top:14px;border-top:1px dashed var(--line)}
.subj-foot .go{display:flex;align-items:center;gap:5px;font-weight:700;font-size:14px;color:var(--brand)}
.subj-card:hover .go{gap:9px}
.subj-meta .acc{font-weight:700;padding:2px 9px;border-radius:20px;background:#fff7ed;color:#f59e0b}

/* ===== 套卷选择 ===== */
.set-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.set-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px 20px;
  box-shadow:var(--shadow-sm);cursor:pointer;transition:.2s;animation:fadeUp .5s both;
  display:flex;flex-direction:column;gap:8px}
.set-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:transparent}
.set-card.all{background:linear-gradient(135deg,#eef2ff,#f5f3ff);border-color:#dfe4ff}
.set-no{font-size:18px;font-weight:800;color:var(--ink)}
.set-range{font-size:13px;color:var(--ink3)}
.set-go{margin-top:6px;font-weight:700;font-size:14px;color:var(--brand)}

/* ===== 错题集 ===== */
.wrong-subj-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.wrong-subj{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px;
  box-shadow:var(--shadow-sm);cursor:pointer;transition:.2s;animation:fadeUp .5s both;
  display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center}
.wrong-subj:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:transparent}
.ws-ico{width:54px;height:54px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:26px;color:#fff}
.ws-name{font-weight:700;font-size:15px;color:var(--ink)}
.ws-count{font-size:13px;font-weight:600;color:var(--err)}
.wrong-head{display:flex;align-items:center;gap:14px;margin-bottom:16px;flex-wrap:wrap}
.wh-name{font-weight:700;color:var(--ink);font-size:15px}
@keyframes fadeUp{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}

/* ===== 统计卡片 ===== */
.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;margin-bottom:22px}
.stat-card{background:var(--card);border-radius:var(--r);padding:20px 22px;box-shadow:var(--shadow-sm);
  border:1px solid var(--line);display:flex;align-items:center;gap:16px;animation:fadeUp .5s both}
.stat-card .si{width:52px;height:52px;border-radius:15px;display:flex;align-items:center;justify-content:center;font-size:25px;flex-shrink:0}
.stat-card .sv{font-size:27px;font-weight:800;line-height:1.1}
.stat-card .sl{font-size:13px;color:var(--ink3);margin-top:2px}
.card{background:var(--card);border-radius:var(--r);padding:22px;box-shadow:var(--shadow-sm);border:1px solid var(--line)}
.card-title{font-size:17px;font-weight:800;margin-bottom:16px;display:flex;align-items:center;gap:8px}

/* ===== 做题页 ===== */
.quiz-wrap{max-width:800px;margin:0 auto}
.quiz-top{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.quiz-progress{flex:1;height:9px;background:#e9ebf3;border-radius:10px;overflow:hidden}
.quiz-progress .bar{height:100%;background:var(--grad);border-radius:10px;transition:width .4s cubic-bezier(.4,0,.2,1)}
.quiz-count{font-weight:700;font-size:14px;color:var(--ink2);white-space:nowrap}
.quiz-card{background:var(--card);border-radius:var(--r-lg);padding:30px 28px;box-shadow:var(--shadow);
  border:1px solid var(--line)}
.q-num{display:inline-flex;align-items:center;gap:7px;font-size:13px;font-weight:700;color:var(--brand);
  background:#eef2ff;padding:5px 12px;border-radius:20px;margin-bottom:14px}
.q-stem{font-size:19px;font-weight:700;line-height:1.65;margin-bottom:22px;color:var(--ink)}
.options{display:flex;flex-direction:column;gap:12px}
.opt{display:flex;align-items:center;gap:14px;padding:15px 18px;border-radius:15px;
  border:2px solid var(--line);background:#fbfbfd;cursor:pointer;
  transition:transform .15s,border-color .2s,background .2s,box-shadow .2s}
.opt:hover{border-color:#c7cbff;background:#fff;transform:translateX(3px)}
.opt .key{width:32px;height:32px;border-radius:9px;background:#eef1f8;color:var(--ink2);
  display:flex;align-items:center;justify-content:center;font-weight:800;flex-shrink:0;transition:.2s}
.opt .txt{flex:1;font-size:15.5px;font-weight:500}
.opt.sel{border-color:var(--brand);background:#eef2ff;box-shadow:0 4px 14px rgba(99,102,241,.18)}
.opt.sel .key{background:var(--grad);color:#fff}
.opt.correct{border-color:var(--ok);background:#ecfdf5}
.opt.correct .key{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--err);background:#fef2f2}
.opt.wrong .key{background:var(--err);color:#fff}
.opt.disabled{cursor:default;pointer-events:none}
.q-analysis{margin-top:18px;padding:15px 17px;border-radius:14px;background:#f0f9ff;
  border-left:4px solid var(--info);font-size:14px;line-height:1.7;color:var(--ink2);animation:fadeUp .3s both}
.q-analysis b{color:var(--info)}
.quiz-foot{display:flex;justify-content:space-between;gap:12px;margin-top:24px}

/* ===== 结果页 ===== */
.result-hero{text-align:center;padding:30px 0 10px}
.score-ring{width:170px;height:170px;margin:0 auto 18px;position:relative}
.score-ring svg{transform:rotate(-90deg)}
.score-ring .pv{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
.score-ring .pv .n{font-size:46px;font-weight:800;line-height:1}
.score-ring .pv .u{font-size:14px;color:var(--ink3);margin-top:4px}
.result-msg{font-size:22px;font-weight:800;margin-bottom:6px}
.result-sub{color:var(--ink3);margin-bottom:22px}
.result-stats{display:flex;justify-content:center;gap:28px;margin-bottom:26px}
.result-stats .rs{text-align:center}
.result-stats .rs .v{font-size:26px;font-weight:800}
.result-stats .rs .l{font-size:12.5px;color:var(--ink3)}

/* ===== 记录列表 ===== */
.rec-list{display:flex;flex-direction:column;gap:12px}
.rec-item{display:flex;align-items:center;gap:14px;padding:16px 18px;background:var(--card);
  border-radius:var(--r);border:1px solid var(--line);box-shadow:var(--shadow-sm);animation:fadeUp .4s both}
.rec-item .ri{width:46px;height:46px;border-radius:13px;display:flex;align-items:center;justify-content:center;
  font-size:22px;color:#fff;flex-shrink:0}
.rec-item .rmain{flex:1;min-width:0}
.rec-item .rmain .t{font-weight:700;font-size:15px}
.rec-item .rmain .s{font-size:12.5px;color:var(--ink3);margin-top:2px}
.rec-score{font-size:20px;font-weight:800}
.pct-bar{height:7px;border-radius:8px;background:#eceef3;overflow:hidden;margin-top:6px}
.pct-bar .f{height:100%;border-radius:8px}

/* ===== 管理后台 ===== */
.admin{display:flex;min-height:100vh}
.sidebar{width:240px;background:#1a1c2e;color:#c7cbe0;flex-shrink:0;display:flex;flex-direction:column;
  position:sticky;top:0;height:100vh}
.sidebar .logo{display:flex;align-items:center;gap:11px;padding:22px 22px;font-weight:800;font-size:18px;color:#fff}
.sidebar .logo .mark{width:38px;height:38px;border-radius:11px;background:var(--grad);display:flex;align-items:center;justify-content:center;font-size:20px}
.side-nav{flex:1;padding:8px 12px;display:flex;flex-direction:column;gap:4px;overflow-y:auto}
.side-nav a{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:12px;
  font-size:14.5px;font-weight:600;color:#a5a9c4;transition:.18s}
.side-nav a .i{font-size:18px}
.side-nav a:hover{background:rgba(255,255,255,.06);color:#fff}
.side-nav a.on{background:var(--grad);color:#fff;box-shadow:0 6px 16px rgba(99,102,241,.4)}
.side-foot{padding:14px 16px;border-top:1px solid rgba(255,255,255,.08)}
.side-user{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.side-user .nm{font-size:14px;font-weight:600;color:#fff}
.side-user .rl{font-size:12px;color:#8a8fb0}
.admin-main{flex:1;min-width:0;background:var(--bg);display:flex;flex-direction:column}
.admin-head{background:#fff;border-bottom:1px solid var(--line);padding:16px 26px;display:flex;
  align-items:center;gap:14px;position:sticky;top:0;z-index:20}
.admin-head h2{font-size:20px;font-weight:800}
.admin-head .sub{color:var(--ink3);font-size:13.5px}
.admin-body{padding:24px 26px;flex:1;overflow-y:auto}
.burger{display:none}

/* ===== 表格 ===== */
.table-wrap{background:#fff;border-radius:var(--r);border:1px solid var(--line);overflow:hidden;box-shadow:var(--shadow-sm)}
table{width:100%;border-collapse:collapse}
th,td{text-align:left;padding:14px 16px;font-size:14px}
th{background:#f8f9fc;color:var(--ink2);font-weight:700;font-size:12.5px;letter-spacing:.3px;
  text-transform:uppercase;border-bottom:1px solid var(--line)}
td{border-bottom:1px solid #f2f3f7;color:var(--ink)}
tr:last-child td{border-bottom:none}
tbody tr{transition:background .15s}
tbody tr:hover{background:#fafbff}
.td-actions{display:flex;gap:8px}

/* ===== 弹窗 ===== */
.modal-mask{position:fixed;inset:0;z-index:200;background:rgba(20,15,50,.5);backdrop-filter:blur(4px);
  display:flex;align-items:center;justify-content:center;padding:20px}
.modal{width:100%;max-width:560px;background:#fff;border-radius:var(--r-lg);box-shadow:0 30px 70px rgba(20,10,60,.4);
  max-height:90vh;display:flex;flex-direction:column;animation:modalIn .35s cubic-bezier(.34,1.4,.64,1)}
@keyframes modalIn{from{opacity:0;transform:scale(.92) translateY(20px)}to{opacity:1;transform:none}}
.modal-head{padding:22px 24px 0;display:flex;align-items:center;gap:12px}
.modal-head h3{font-size:19px;font-weight:800;flex:1}
.modal-close{width:34px;height:34px;border-radius:10px;background:#f1f2f8;display:flex;align-items:center;
  justify-content:center;font-size:20px;color:var(--ink3);transition:.18s}
.modal-close:hover{background:#e6e8f2;color:var(--ink)}
.modal-body{padding:20px 24px;overflow-y:auto}
.modal-foot{padding:16px 24px 22px;display:flex;gap:12px;justify-content:flex-end;border-top:1px solid var(--line)}
.opt-editor{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.opt-editor .k{width:36px;height:40px;border-radius:10px;background:#eef2ff;color:var(--brand);
  display:flex;align-items:center;justify-content:center;font-weight:800;flex-shrink:0}
.opt-editor.ans .k{background:var(--grad);color:#fff}
.ans-pick{display:flex;gap:8px;flex-wrap:wrap}

.mask-badge{padding:4px 11px;border-radius:20px;font-size:12px;font-weight:700}
.mb-a{background:#eef2ff;color:var(--brand)}
.mb-b{background:#ecfdf5;color:var(--ok)}

/* ===== 过渡动画 ===== */
.fade-enter-active,.fade-leave-active{transition:opacity .25s,transform .25s}
.fade-enter-from{opacity:0;transform:translateY(12px)}
.fade-leave-to{opacity:0;transform:translateY(-8px)}
.slide-enter-active{transition:opacity .3s,transform .3s cubic-bezier(.34,1.3,.64,1)}
.slide-enter-from{opacity:0;transform:translateX(30px)}

/* ===== 移动端底部导航 ===== */
.mobile-nav{display:none}

/* ===== 响应式 ===== */
@media (max-width:860px){
  .sidebar{position:fixed;left:0;top:0;z-index:300;transform:translateX(-100%);transition:transform .3s}
  .sidebar.open{transform:none;box-shadow:0 0 60px rgba(0,0,0,.5)}
  .sb-mask{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:250}
  .burger{display:flex;width:40px;height:40px;border-radius:11px;background:#f1f2f8;
    align-items:center;justify-content:center;font-size:20px}
  .admin-body{padding:16px 14px}
  .admin-head{padding:14px 16px}
  .table-wrap{overflow-x:auto}
  table{min-width:560px}
}
@media (max-width:640px){
  .container{padding:18px 14px 92px}
  .page-head h2{font-size:22px}
  .top-nav{display:none}
  .mobile-nav{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:80;background:rgba(255,255,255,.94);
    backdrop-filter:blur(14px);border-top:1px solid var(--line);padding:8px 6px 10px;justify-content:space-around}
  .mobile-nav a{flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;padding:5px;
    font-size:11px;font-weight:600;color:var(--ink3);border-radius:12px;transition:.15s}
  .mobile-nav a .i{font-size:21px}
  .mobile-nav a.on{color:var(--brand)}
  .quiz-card{padding:22px 18px;border-radius:var(--r)}
  .q-stem{font-size:17px}
  .opt{padding:13px 14px}
  .subject-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:13px}
  .set-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px}
  .wrong-subj-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px}
  .subj-card{padding:17px}
  .subj-ico{width:48px;height:48px;font-size:24px}
  .result-stats{gap:18px}
  .auth-card{padding:32px 22px}
  .user-pill .nm{display:none}
  .modal{max-width:100%;border-radius:20px 20px 0 0;margin-top:auto;max-height:94vh}
  .modal-mask{padding:0;align-items:flex-end}
}

/* ===== 自定义 Logo ===== */
.mark img.logo-img{width:62%;height:62%;object-fit:contain;border-radius:6px}
.auth-logo .mark img.logo-img{width:58%;height:58%}
.sidebar .logo .mark img.logo-img{width:62%;height:62%}
.logo-prev{width:74px;height:74px;border-radius:18px;display:flex;align-items:center;justify-content:center;
  font-size:34px;color:#fff;overflow:hidden;box-shadow:var(--shadow-sm);background:var(--grad)}
.logo-prev img{width:100%;height:100%;object-fit:contain;background:#fff}
.file-in{font-size:13px;color:var(--ink2)}
.file-in::file-selector-button{margin-right:10px;padding:7px 14px;border:none;border-radius:10px;
  background:var(--grad);color:#fff;font-weight:600;cursor:pointer}
.clr-grid{display:flex;gap:22px;flex-wrap:wrap}
.clr{display:flex;flex-direction:column;gap:8px}
.clr span{font-size:13px;font-weight:600;color:var(--ink2)}
.clr input[type=color]{width:54px;height:40px;border:none;border-radius:10px;background:none;cursor:pointer;padding:0}
.clr-hex{width:120px}
.switch-row{display:flex;align-items:center;justify-content:space-between;gap:16px}
.switch{width:54px;height:30px;border-radius:20px;background:#d5d8e2;position:relative;transition:.2s;flex-shrink:0}
.switch.on{background:var(--grad)}
.switch span{position:absolute;top:3px;left:3px;width:24px;height:24px;border-radius:50%;background:#fff;
  transition:.2s;box-shadow:0 2px 6px rgba(0,0,0,.22)}
.switch.on span{left:27px}
.theme-toggle{width:38px;height:38px;border-radius:11px;background:#eef1f8;display:flex;align-items:center;
  justify-content:center;font-size:18px;transition:.18s;margin-left:6px;flex-shrink:0}
.theme-toggle:hover{background:#e4e8f4;transform:translateY(-1px)}

/* 登录页暗色切换 */
.auth-theme{position:absolute;top:14px;right:14px;width:38px;height:38px;border-radius:11px;
  background:rgba(255,255,255,.55);display:flex;align-items:center;justify-content:center;font-size:18px;
  transition:.18s;backdrop-filter:blur(6px);z-index:3}
.auth-theme:hover{background:rgba(255,255,255,.8);transform:translateY(-1px)}

/* 科目卡·按套卷按钮 */
.subj-set-btn{margin-top:12px;width:100%;padding:9px;border-radius:12px;font-size:13px;font-weight:600;
  background:rgba(99,102,241,.08);color:var(--brand);border:1px solid rgba(99,102,241,.22);transition:.18s}
.subj-set-btn:hover{background:rgba(99,102,241,.16)}

/* 确认弹窗 */
.dlg{text-align:center;max-width:420px;padding:30px 28px}
.dlg-ico{width:56px;height:56px;border-radius:18px;margin:0 auto 16px;display:flex;align-items:center;justify-content:center;font-size:28px;background:#eef2ff}
.dlg-ico.danger{background:#fef2f2}
.dlg-title{font-size:20px;font-weight:800;margin-bottom:10px}
.dlg-msg{color:var(--ink2);font-size:14.5px;line-height:1.7;margin-bottom:22px}
.dlg-foot{display:flex;gap:12px;justify-content:center}
.dlg-foot .btn{flex:1;max-width:160px}

/* 弹窗过渡 */
.modal-enter-active,.modal-leave-active{transition:opacity .28s}
.modal-enter-from,.modal-leave-to{opacity:0}

/* ===== 暗色主题 ===== */
[data-theme="dark"]{
  --bg:#0f1120; --card:#1a1d2e; --line:#2a2e44; --ink:#e8eaf2; --ink2:#b8bdce; --ink3:#8a8fb0;
  --shadow-sm:0 2px 10px rgba(0,0,0,.32); --shadow:0 8px 28px rgba(0,0,0,.42); --shadow-lg:0 18px 44px rgba(0,0,0,.55);
  --chart-axis:#8a8fb0; --chart-split:#2a2e44; --chart-label:#e8eaf2;
}
[data-theme="dark"] body{background:radial-gradient(1100px 560px at 88% -8%, rgba(99,102,241,.1) 0%, transparent 55%), var(--bg)}
[data-theme="dark"] .topbar{background:rgba(20,22,34,.85);border-bottom-color:var(--line)}
[data-theme="dark"] .top-nav a{color:var(--ink2)}
[data-theme="dark"] .top-nav a:hover{background:rgba(255,255,255,.06);color:var(--ink)}
[data-theme="dark"] .top-nav a.on{background:rgba(255,255,255,.1);color:#fff}
[data-theme="dark"] .btn-ghost{background:rgba(255,255,255,.08);color:var(--ink2)}
[data-theme="dark"] .btn-ghost:hover{background:rgba(255,255,255,.15);color:var(--ink)}
[data-theme="dark"] .input{background:#23263a;border-color:var(--line);color:var(--ink)}
[data-theme="dark"] .input:focus{box-shadow:0 0 0 4px rgba(99,102,241,.25)}
[data-theme="dark"] .chip{background:#23263a;border-color:var(--line);color:var(--ink2)}
[data-theme="dark"] .chip:not(.active):hover{border-color:var(--brand);color:var(--brand)}
[data-theme="dark"] .tag{background:rgba(99,102,241,.18);color:#c7cbff}
[data-theme="dark"] .mobile-nav{background:rgba(20,22,34,.94);border-top-color:var(--line)}
[data-theme="dark"] .mobile-nav a{color:var(--ink3)}
[data-theme="dark"] .mobile-nav a.on{color:#fff}
[data-theme="dark"] .admin-head{background:#1a1d2e;border-bottom-color:var(--line)}
[data-theme="dark"] .admin-main{background:var(--bg)}
[data-theme="dark"] .auth-tabs{background:rgba(255,255,255,.14)}
[data-theme="dark"] .auth-tabs button{color:#d7d9e6}
[data-theme="dark"] .auth-tabs button.active{color:#fff}
[data-theme="dark"] th{background:#20233a}
[data-theme="dark"] tbody tr:hover{background:rgba(255,255,255,.04)}
[data-theme="dark"] .subj-meta .acc{background:rgba(245,158,11,.18);color:#fbbf24}
[data-theme="dark"] .q-analysis{background:rgba(14,165,233,.12);border-left-color:var(--info)}
[data-theme="dark"] .sidebar{background:#15172a}
[data-theme="dark"] .topbar-in,.topbar{color:var(--ink)}
[data-theme="dark"] .theme-toggle{background:rgba(255,255,255,.08)}
[data-theme="dark"] .theme-toggle:hover{background:rgba(255,255,255,.15)}

/* 暗色下补齐可读性（选项框 / 套卷卡 / 弹窗 / 进度条 / 首页） */
[data-theme="dark"] .opt{background:#23263a;border-color:var(--line)}
[data-theme="dark"] .opt:hover{background:#2a2e44;border-color:#4a4f6e}
[data-theme="dark"] .opt .key{background:#2e3350;color:var(--ink2)}
[data-theme="dark"] .opt .txt{color:var(--ink)}
[data-theme="dark"] .opt.sel{background:rgba(99,102,241,.16);border-color:var(--brand)}
[data-theme="dark"] .opt.sel .key{background:var(--grad);color:#fff}
[data-theme="dark"] .opt.correct{border-color:var(--ok);background:rgba(16,185,129,.14)}
[data-theme="dark"] .opt.correct .key{background:var(--ok);color:#fff}
[data-theme="dark"] .opt.wrong{border-color:var(--err);background:rgba(239,68,68,.14)}
[data-theme="dark"] .opt.wrong .key{background:var(--err);color:#fff}
[data-theme="dark"] .set-card.all{background:linear-gradient(135deg,rgba(99,102,241,.16),rgba(139,92,246,.16));border-color:rgba(99,102,241,.3)}
[data-theme="dark"] .set-no{color:var(--ink)}
[data-theme="dark"] .set-range{color:var(--ink3)}
[data-theme="dark"] .q-num{background:rgba(99,102,241,.16);color:var(--brand)}
[data-theme="dark"] .quiz-progress{background:#2a2e44}
[data-theme="dark"] .pct-bar{background:#2a2e44}
[data-theme="dark"] .score-ring circle:first-child{stroke:#2a2e44}
[data-theme="dark"] .modal{background:var(--card)}
[data-theme="dark"] .modal-close{background:rgba(255,255,255,.08);color:var(--ink3)}
[data-theme="dark"] .modal-close:hover{background:rgba(255,255,255,.15);color:var(--ink)}
[data-theme="dark"] .auth-card{background:rgba(26,29,46,.96)}
[data-theme="dark"] .auth-logo p{color:var(--ink3)}
[data-theme="dark"] .auth-hint{color:var(--ink3)}
[data-theme="dark"] .logo-prev img{background:#1a1d2e}
[data-theme="dark"] .auth-theme{background:rgba(255,255,255,.1)}
[data-theme="dark"] .auth-theme:hover{background:rgba(255,255,255,.18)}
[data-theme="dark"] .subj-set-btn{background:rgba(99,102,241,.14);color:var(--brand);border-color:rgba(99,102,241,.25)}
[data-theme="dark"] .subj-set-btn:hover{background:rgba(99,102,241,.22)}
[data-theme="dark"] .dlg-ico{background:rgba(99,102,241,.18)}
[data-theme="dark"] .dlg-ico.danger{background:rgba(239,68,68,.18)}
[data-theme="dark"] .dlg-title{color:var(--ink)}
[data-theme="dark"] .page-head h2{color:var(--ink)}
[data-theme="dark"] .card-title{color:var(--ink)}