/* ============================================================
   班级积分统计 · 教室记分台
   方向：深松绿侧栏 + 暖纸工作区，边框分层代替阴影，衬线数字做记分感
   ============================================================ */
:root{
  /* —— 方案 A · 墨蓝 × 琥珀 —— */
  --deep:#16324f; --deep-2:#1f4468; --deep-3:#102538;
  --brand:#1f5c8b; --brand-2:#17527b;
  --amber:#e0a33c; --amber-soft:#f7e8cc;
  --paper:#f6f5f1; --surface:#fffefb; --surface-2:#f2f3f6;
  --line:#e2e0d9; --line-strong:#d3cfc4;
  --text:#22303d; --text-2:#4a5866; --muted:#78838f;
  --plus:#2f7d5b; --plus-bg:#e9f3ee; --minus:#c0503f; --minus-bg:#fbeeec;
  --gold:#a9761a; --silver:#7c8794; --bronze:#9a6540;
  /* 派生色（原来写死在组件里的，现在统一成变量） */
  --primary-50:#eaf0f7;
  --tint:#eaf0f7; --tint-soft:#f2f6fb; --tint-line:#d6e2ee;
  --hover:#f1f2f5; --line-hover:#c2c8d4; --check-line:#c3cad6;
  --on-deep:var(--on-deep); --on-deep-2:#cfd8e4; --on-deep-3:#a8b8ca;
  --plus-line:#cfe4d9; --plus-bg-hover:#dcefe4;
  --minus-line:#eed4d0; --minus-bg-hover:#f8ddd9;
  --accent-ink:#7a5410; --accent-line:#edd9b0; --accent-bg-soft:#fffaf0;
  --amber-ink:#2a1f08;
  --dark-btn:#38414f; --switch-off:#d3d8e2; --arrow:var(--arrow);
  --scroll:#ccd2da; --scroll-hover:#b9c0cb;
  --silver-bar:#b9c0cb; --bronze-bar:#c2a184;
  --toast-text:#f0f4f8; --toast-err:#8d3a33;
  --r-sm:8px; --r-md:12px; --r-lg:16px;
  --shadow-1:0 1px 2px rgba(20,30,50,.06);
  --shadow-2:0 6px 20px rgba(20,30,50,.10), 0 1px 2px rgba(20,30,50,.06);
  --ease:cubic-bezier(.2,.8,.2,1);
  --serif:"Cambria","Georgia","Times New Roman","Songti SC",serif;
  --sans:"Microsoft YaHei UI","Microsoft YaHei","PingFang SC","Noto Sans SC","Segoe UI",sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--paper);color:var(--text);font:15px/1.6 var(--sans);-webkit-font-smoothing:antialiased}
.hidden{display:none !important}
.muted{color:var(--muted);font-size:12.5px}
.right{margin-left:auto}
h1,h2,h3{margin:0;font-weight:700;letter-spacing:-.01em}
.section-head{display:flex;align-items:center;gap:10px;margin:22px 0 10px;flex-wrap:wrap}
.section-head h2{font-size:16px}
.section-head:first-child{margin-top:0}
::-webkit-scrollbar{width:9px;height:9px}
::-webkit-scrollbar-thumb{background:var(--scroll);border-radius:9px}
::-webkit-scrollbar-thumb:hover{background:var(--scroll-hover)}
:focus-visible{outline:2px solid var(--amber);outline-offset:2px;border-radius:4px}

/* ============ 登录 / 注册 ============ */
.auth{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:var(--paper)}
.auth-panel{display:grid;grid-template-columns:1.02fr .98fr;width:100%;max-width:940px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow-2)}
.auth-side{background:var(--deep);color:var(--on-deep);padding:40px 38px;display:flex;flex-direction:column;
  background-image:radial-gradient(circle at 88% 12%, rgba(224,163,60,.30), transparent 46%),
                   radial-gradient(circle at 4% 96%, rgba(31,68,104,.92), transparent 52%)}
.side-brand{display:flex;align-items:center;gap:10px;font-weight:700}
.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;
  border-radius:9px;background:rgba(255,255,255,.12);color:var(--amber)}
.auth-side h1{font-size:31px;line-height:1.34;margin:26px 0 12px;letter-spacing:.01em}
.auth-side>p{margin:0;color:rgba(238,244,241,.75);font-size:13.5px;line-height:1.75;text-wrap:pretty}
.auth-facts{margin:auto 0 0;padding:0;display:flex;flex-direction:column;gap:12px}
.auth-facts div{display:flex;gap:12px;align-items:baseline}
.auth-facts dt{font-size:12px;color:var(--amber);font-weight:700;min-width:56px;letter-spacing:.04em}
.auth-facts dd{margin:0;font-size:12.5px;color:rgba(238,244,241,.78)}
.auth-form{padding:36px 38px;display:flex;flex-direction:column;justify-content:center}
.seg{display:flex;gap:2px;border-bottom:1px solid var(--line);margin-bottom:22px}
.seg-item{flex:1;border:0;background:transparent;padding:10px 4px;cursor:pointer;font:inherit;font-weight:600;
  color:var(--muted);border-bottom:2px solid transparent;margin-bottom:-1px;transition:.16s var(--ease)}
.seg-item.active{color:var(--deep);border-bottom-color:var(--amber)}

/* ============ 表单 ============ */
.field{display:block;margin-bottom:14px}
.field>span{display:block;font-size:12px;color:var(--text-2);margin-bottom:6px;font-weight:600}
.input,select.input,textarea.input{width:100%;padding:10px 12px;border:1px solid var(--line-strong);
  border-radius:var(--r-sm);background:var(--surface);font:inherit;color:var(--text);outline:none;
  transition:border-color .16s var(--ease),box-shadow .16s var(--ease)}
.input:hover{border-color:var(--line-hover)}
.input:focus{border-color:var(--deep);box-shadow:0 0 0 3px rgba(18,63,58,.12)}
input:disabled{background:var(--surface-2);color:var(--muted)}
select.input{appearance:none;padding-right:28px;cursor:pointer;
  background-image:linear-gradient(45deg,transparent 50%,var(--arrow) 50%),linear-gradient(135deg,var(--arrow) 50%,transparent 50%);
  background-position:calc(100% - 15px) 50%,calc(100% - 10px) 50%;background-size:5px 5px,5px 5px;background-repeat:no-repeat}
.captcha-row{display:flex;gap:8px;align-items:stretch}
.captcha-row input{flex:1;letter-spacing:3px;font-weight:700}
.captcha-img{width:132px;height:43px;object-fit:cover;border:1px solid var(--line-strong);border-radius:var(--r-sm);
  cursor:pointer;background:var(--surface-2);flex:none}
.captcha-img:hover{border-color:var(--deep)}
.tip{margin:12px 0 0;font-size:12.5px;color:var(--minus);min-height:17px}

/* ============ 按钮 ============ */
.btn{border:1px solid var(--line-strong);background:var(--surface);color:var(--text);padding:8px 13px;
  border-radius:var(--r-sm);font:inherit;font-weight:600;font-size:13.5px;cursor:pointer;
  transition:background .15s var(--ease),border-color .15s var(--ease),transform .06s var(--ease);
  display:inline-flex;align-items:center;justify-content:center;gap:6px;white-space:nowrap}
.btn:hover{background:var(--surface-2);border-color:var(--line-hover)}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-2);border-color:var(--brand-2)}
.btn-dark{background:var(--dark-btn);border-color:var(--dark-btn);color:#fff}
.btn-danger-ghost{color:var(--minus);border-color:var(--minus-line);background:#fff}
.btn-danger-ghost:hover{background:var(--minus-bg)}
.btn-block{display:block;width:100%;margin-bottom:9px}
.btn-lg{padding:12px 16px;font-size:15px;margin-top:8px}
.btn.small{padding:5px 10px;font-size:12px;border-radius:7px}
.icon-btn{border:1px solid var(--line-strong);background:var(--surface);border-radius:var(--r-sm);
  width:31px;height:31px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;
  color:var(--text-2);flex:none;transition:.15s var(--ease)}
.icon-btn:hover{background:var(--surface-2);color:var(--deep)}

/* ============ 应用骨架 ============ */
.app{display:grid;grid-template-columns:238px minmax(0,1fr);min-height:100vh}
.sidebar{background:var(--deep);color:var(--on-deep-2);position:sticky;top:0;height:100vh;display:flex;
  flex-direction:column;gap:14px;padding:18px 14px}
.sidebar .side-brand{color:var(--on-deep);font-size:15px}
.sidebar .brand-mark{background:rgba(255,255,255,.10);color:var(--amber)}
.side-class{display:flex;gap:6px;position:relative}
.class-select{flex:1;min-width:0;border:1px solid rgba(255,255,255,.16);border-radius:var(--r-sm);
  padding:8px 10px;font:inherit;font-size:13px;font-weight:600;background:rgba(255,255,255,.07);
  color:var(--on-deep);cursor:pointer}
.class-select:focus{outline:none;border-color:var(--amber);box-shadow:0 0 0 3px rgba(217,131,36,.2)}
.class-select option{color:var(--text)}
.sidebar .icon-btn{background:rgba(255,255,255,.07);border-color:rgba(255,255,255,.16);color:var(--on-deep-2)}
.sidebar .icon-btn:hover{background:rgba(255,255,255,.14);color:#fff}
.side-create{width:100%;display:flex;align-items:center;justify-content:center;gap:7px;padding:8px 10px;
  border-color:rgba(255,255,255,.20);background:rgba(255,255,255,.11);color:#fff;font-weight:700}
.side-create:hover{background:rgba(255,255,255,.17);border-color:rgba(255,255,255,.28)}
.side-create svg{color:var(--amber);flex:none}
.side-nav{display:flex;flex-direction:column;gap:3px;flex:1}
.tab{display:flex;align-items:center;gap:11px;padding:10px 12px;border:0;border-radius:9px;
  background:transparent;color:var(--on-deep-3);font:inherit;font-weight:600;font-size:13.5px;cursor:pointer;
  text-align:left;transition:.15s var(--ease)}
.tab svg{flex:none;opacity:.85}
.tab:hover{background:rgba(255,255,255,.07);color:var(--on-deep)}
.tab.active{background:rgba(255,255,255,.13);color:#fff}
.tab.active svg{color:var(--amber);opacity:1}
.side-user{display:flex;align-items:center;gap:9px;padding-top:12px;border-top:1px solid rgba(255,255,255,.12);position:relative}
.ava{width:30px;height:30px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;
  font-weight:700;font-size:13px;color:#fff;background:var(--deep-2);flex:none}
.side-user .who{font-size:12.5px;color:var(--on-deep-2);flex:1;min-width:0;overflow:hidden;
  text-overflow:ellipsis;white-space:nowrap}
main{padding:22px 26px 60px;min-width:0;max-width:1340px}
.view{display:none}
.view.active{display:block}
.menu{position:absolute;top:40px;background:var(--surface);border:1px solid var(--line-strong);
  border-radius:var(--r-md);box-shadow:var(--shadow-2);padding:5px;min-width:158px;z-index:70}
.menu button{display:block;width:100%;text-align:left;border:0;background:transparent;padding:9px 11px;
  border-radius:7px;font:inherit;font-size:13.5px;cursor:pointer;color:var(--text);white-space:nowrap}
.menu button:hover{background:var(--surface-2)}
.menu button.danger{color:var(--minus)}
#class-menu{left:0;top:42px}
#user-menu{right:0;bottom:40px;top:auto}

/* ============ 统计条 ============ */
.stat-strip{display:flex;border:1px solid var(--line);border-radius:var(--r-md);background:var(--surface);
  overflow:hidden;margin-bottom:16px}
.stat-cell{flex:1;padding:11px 16px;border-right:1px solid var(--line);min-width:0}
.stat-cell:last-child{border-right:0}
.stat-cell .k{font-size:11.5px;color:var(--muted);letter-spacing:.03em}
.stat-cell .v{font-family:var(--serif);font-size:25px;font-weight:700;line-height:1.25;
  font-variant-numeric:tabular-nums;color:var(--text)}
.stat-cell .v.deep{color:var(--deep)} .stat-cell .v.plus{color:var(--plus)}
.stat-cell .v.amber{color:var(--amber)} .stat-cell .v.slate{color:var(--text-2)}

/* ============ 工具栏 ============ */
.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:14px}
.toolbar .input{width:auto;min-width:118px}
#search-input{flex:1;min-width:150px}
.switch-row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.switch{display:flex;align-items:center;gap:10px;font-weight:600;font-size:13.5px;cursor:pointer}
.switch input{width:40px;height:23px;appearance:none;background:var(--switch-off);border-radius:20px;position:relative;
  transition:background .18s var(--ease);cursor:pointer;flex:none}
.switch input:checked{background:var(--deep)}
.switch input::after{content:"";position:absolute;top:2px;left:2px;width:19px;height:19px;border-radius:50%;
  background:#fff;transition:transform .18s var(--ease)}
.switch input:checked::after{transform:translateX(17px)}

/* ============ 操作条 ============ */
.action-bar{position:sticky;top:0;z-index:20;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-md);padding:11px 13px;display:flex;flex-direction:column;gap:9px;margin-bottom:16px}
.ab-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.ab-row.sub{padding-top:9px;border-top:1px dashed var(--line);gap:8px}
.ab-field{display:flex;align-items:center;gap:6px}
.ab-field>span{font-size:12px;color:var(--muted);font-weight:600;white-space:nowrap}
.ab-field.grow{flex:1;min-width:150px}
.ab-field .input{width:auto}
.ab-field.grow .input{flex:1;min-width:0}
.ab-quick{display:flex;gap:8px;flex-wrap:wrap}
.quick-row{display:flex;gap:4px}
.quick-row .btn{padding:7px 0;width:42px;font-weight:700;font-variant-numeric:tabular-nums}
.quick-row.plus .btn{color:var(--plus);border-color:var(--plus-line);background:var(--plus-bg)}
.quick-row.plus .btn:hover{background:var(--plus-bg-hover)}
.quick-row.minus .btn{color:var(--minus);border-color:var(--minus-line);background:var(--minus-bg)}
.quick-row.minus .btn:hover{background:var(--minus-bg-hover)}
.sel-hint{font-size:12.5px;color:var(--muted)}
.sel-hint.on{color:var(--deep);font-weight:700}

/* ============ 学生卡片网格 ============ */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(208px,1fr));gap:10px}
.scard{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);padding:11px 12px;
  display:flex;flex-direction:column;gap:9px;cursor:pointer;transition:.15s var(--ease)}
.scard:hover{border-color:var(--line-strong)}
.scard.selected{border-color:var(--deep);background:var(--tint-soft);box-shadow:inset 0 0 0 1px var(--deep)}
.scard-top{display:flex;align-items:center;gap:9px;min-width:0}
.ava-sq{width:34px;height:34px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;
  font-weight:700;font-size:15px;color:#fff;flex:none}
.scard-id{flex:1;min-width:0}
.scard-name{font-weight:700;font-size:14.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.scard-group{font-size:11.5px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.scard-score{font-family:var(--serif);font-size:23px;font-weight:700;font-variant-numeric:tabular-nums;
  line-height:1;flex:none;min-width:36px;text-align:right}
.scard-score.pos{color:var(--plus)} .scard-score.neg{color:var(--minus)} .scard-score.zero{color:var(--muted)}
.scard-acts{display:flex;gap:5px}
.chip-btn{flex:1;border:1px solid var(--line-strong);background:var(--surface-2);border-radius:7px;
  padding:6px 0;font:inherit;font-size:12.5px;font-weight:700;cursor:pointer;color:var(--text-2);
  font-variant-numeric:tabular-nums;transition:.13s var(--ease)}
.chip-btn:hover{background:var(--hover)}
.chip-btn.minus{color:var(--minus);border-color:var(--minus-line)}
.chip-btn.plus{color:var(--plus);border-color:var(--plus-line)}
.chip-btn.minus:hover{background:var(--minus-bg)}
.chip-btn.plus:hover{background:var(--plus-bg)}

/* ============ 通用卡片 / 列表 ============ */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden}
.card+.card{margin-top:14px}
.card-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 15px;
  border-bottom:1px solid var(--line);flex-wrap:wrap}
.card-body{padding:15px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.list{max-height:none;overflow:auto}
.list.compact{max-height:290px}
.row{display:flex;align-items:center;gap:10px;padding:9px 15px;border-bottom:1px solid var(--surface-2);
  cursor:pointer;transition:background .13s var(--ease)}
.row:last-child{border-bottom:0}
.row:hover{background:var(--surface-2)}
.row.selected{background:var(--tint)}
.row .name{font-weight:600;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.row .idx{width:28px;color:var(--muted);font-size:12px;text-align:right;flex:none;font-variant-numeric:tabular-nums}
.avatar-sm{width:31px;height:31px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;
  color:#fff;font-weight:700;font-size:13px;flex:none}
.chip{background:var(--surface-2);border:1px solid var(--line);border-radius:999px;padding:2px 9px;
  font-size:11.5px;color:var(--text-2);flex:none;max-width:128px;overflow:hidden;
  text-overflow:ellipsis;white-space:nowrap}
.score-pill{min-width:52px;text-align:center;border-radius:7px;padding:2px 9px;font-weight:700;font-size:13.5px;
  font-variant-numeric:tabular-nums;flex:none;border:1px solid transparent}
.score-pill.pos{background:var(--plus-bg);color:var(--plus);border-color:var(--plus-line)}
.score-pill.neg{background:var(--minus-bg);color:var(--minus);border-color:var(--minus-line)}
.score-pill.zero{background:var(--surface-2);color:var(--muted);border-color:var(--line)}
.check{width:18px;height:18px;border:1.6px solid var(--check-line);border-radius:5px;flex:none;background:var(--surface);
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:12px;transition:.14s var(--ease)}
.row.selected .check{background:var(--deep);border-color:var(--deep)}
.row.selected .check::after{content:"✓"}
.medal{width:34px;text-align:center;font-weight:700;flex:none;font-variant-numeric:tabular-nums;font-size:13px}
.medal.m1{color:var(--gold)} .medal.m2{color:var(--silver)} .medal.m3{color:var(--bronze)}
.bar{flex:1;height:7px;background:var(--surface-2);border-radius:99px;overflow:hidden;min-width:40px;
  border:1px solid var(--line)}
.bar>i{display:block;height:100%;background:var(--deep);border-radius:99px}
.bar>i.amber{background:var(--amber)}
.empty{padding:32px 20px;text-align:center;color:var(--muted);font-size:13.5px}
.empty .ico{font-size:24px;display:block;margin-bottom:8px;opacity:.5}
.delta{font-weight:700;font-variant-numeric:tabular-nums;min-width:50px;text-align:right;font-size:13.5px}
.delta.pos{color:var(--plus)} .delta.neg{color:var(--minus)}
.time{color:var(--muted);font-size:12px;width:134px;flex:none;font-variant-numeric:tabular-nums}
.row-actions{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.tag{font-size:11px;padding:2px 8px;border-radius:6px;background:var(--surface-2);color:var(--text-2);
  border:1px solid var(--line);flex:none;font-weight:600}
.tag.admin{background:var(--tint);color:var(--deep);border-color:var(--tint-line)}
.tag.off{background:var(--minus-bg);color:var(--minus);border-color:var(--minus-line)}
.tag.me{background:var(--amber-soft);color:var(--accent-ink);border-color:var(--accent-line)}

/* ============ 领奖台 ============ */
.podium{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:14px;align-items:end}
.podium-item{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);
  padding:14px 12px;text-align:center;position:relative;overflow:hidden}
.podium-item::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:var(--line-strong)}
.podium-item .rank{font-size:11.5px;font-weight:700;color:var(--muted);letter-spacing:.06em}
.podium-item .who{font-weight:700;margin:7px 0 2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.podium-item .grp{font-size:12px;color:var(--muted);min-height:18px}
.podium-item .pts{font-family:var(--serif);font-size:26px;font-weight:700;margin-top:4px;
  font-variant-numeric:tabular-nums;line-height:1.1}
.podium-item.p1{border-color:var(--accent-line);background:linear-gradient(180deg,var(--accent-bg-soft),var(--surface));transform:translateY(-7px)}
.podium-item.p1::before{background:var(--amber)}
.podium-item.p1 .pts{color:var(--gold)}
.podium-item.p2::before{background:var(--silver-bar)}
.podium-item.p2 .pts{color:var(--silver)}
.podium-item.p3::before{background:var(--bronze-bar)}
.podium-item.p3 .pts{color:var(--bronze)}

/* ============ 弹窗 / 提示 ============ */
.modal-mask{position:fixed;inset:0;background:rgba(18,32,29,.45);display:flex;align-items:center;
  justify-content:center;padding:18px;z-index:100}
.modal{background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--r-lg);width:100%;
  max-width:432px;box-shadow:var(--shadow-2);max-height:88vh;display:flex;flex-direction:column}
.modal-head{padding:15px 19px;border-bottom:1px solid var(--line);font-size:15px}
.modal-body{padding:19px;overflow:auto}
.modal-foot{padding:13px 19px;border-top:1px solid var(--line);display:flex;justify-content:flex-end;gap:8px}
.toast{position:fixed;left:50%;bottom:30px;transform:translate(-50%,20px);background:var(--deep-3);
  color:var(--toast-text);padding:11px 18px;border-radius:var(--r-md);font-size:13.5px;opacity:0;pointer-events:none;
  transition:.24s var(--ease);z-index:200;max-width:88vw;text-align:center;box-shadow:var(--shadow-2)}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast.err{background:var(--toast-err)}
.hint-banner{background:var(--amber-soft);border:1px solid var(--accent-line);color:var(--accent-ink);border-radius:var(--r-md);
  padding:11px 15px;margin-bottom:14px;font-size:13px;display:flex;gap:12px;align-items:center;justify-content:space-between}
.checkbox-group{display:flex;flex-wrap:wrap;gap:8px 10px;padding:6px 0}
.checkbox-group label{display:flex;align-items:center;gap:6px;font-weight:500;font-size:13.5px;cursor:pointer;
  background:var(--surface-2);border:1px solid var(--line);border-radius:7px;padding:7px 11px;transition:.15s var(--ease)}
.checkbox-group label:hover{border-color:var(--line-strong)}
.checkbox-group input{width:15px;height:15px;accent-color:var(--deep)}
.checkbox-group label:has(input:checked){background:var(--tint);border-color:var(--tint-line);color:var(--deep)}
.field .muted{display:block;margin-top:5px;font-size:11.5px}

/* ============ 响应式 ============ */
@media (max-width:1080px){
  .grid-2{grid-template-columns:1fr}
}
@media (max-width:900px){
  .app{grid-template-columns:1fr}
  .sidebar{position:fixed;top:0;left:0;right:0;height:56px;flex-direction:row;align-items:center;
    gap:10px;padding:0 12px;z-index:60}
  .sidebar .brand-name{display:none}
  .side-class{flex:1;min-width:0}
  .side-nav{position:fixed;left:0;right:0;bottom:0;top:auto;height:64px;flex-direction:row;
    background:var(--deep-2);padding:5px 6px;gap:2px;overflow-x:auto;z-index:60;
    border-top:1px solid rgba(255,255,255,.12)}
  .tab{flex-direction:column;gap:3px;font-size:11px;padding:6px 8px;flex:1;min-width:66px;
    justify-content:center;text-align:center}
  .side-user{padding-top:0;border-top:0}
  .side-user .who{display:none}
  #user-menu{right:0;bottom:auto;top:42px}
  main{padding:70px 13px 84px}
  .stat-strip{flex-wrap:wrap}
  .stat-cell{flex:1 1 45%;border-bottom:1px solid var(--line)}
  .stat-cell:nth-child(2n){border-right:0}
  .stat-cell .v{font-size:22px}
  .card-grid{grid-template-columns:repeat(auto-fill,minmax(156px,1fr));gap:8px}
  .scard{padding:10px}
  .scard-score{font-size:20px}
  .action-bar{position:static}
  .ab-field.grow{flex-basis:100%}
  .time,.chip{display:none}
  .podium{gap:7px}
  .podium-item{padding:11px 7px}
  .podium-item .pts{font-size:20px}
}
@media (max-width:560px){
  .auth-panel{grid-template-columns:1fr;max-width:430px}
  .auth-side{padding:24px 24px 22px}
  .auth-side h1{font-size:24px;margin:16px 0 8px}
  .auth-facts{display:none}
  .auth-form{padding:24px}
  .card-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}
  .toolbar .input{min-width:0;flex:1}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important}
}

/* ============ 勾选账号（添加学生） ============ */
.picker{display:flex;flex-direction:column;gap:8px}
.picker-tools{display:flex;align-items:center;gap:8px}
.picker-count{font-size:12px;color:var(--muted);margin-left:auto}
.picker-search{width:100%}
.picker-list{max-height:236px;overflow:auto;border:1px solid var(--line);border-radius:var(--r-sm);
  background:var(--surface-2);padding:4px}
.picker-item{display:flex;align-items:center;gap:9px;padding:7px 9px;border-radius:7px;cursor:pointer;
  transition:background .13s var(--ease)}
.picker-item:hover{background:var(--hover)}
.picker-item input{width:16px;height:16px;accent-color:var(--deep);flex:none}
.picker-name{font-weight:600;font-size:13.5px;flex:none;max-width:132px;overflow:hidden;
  text-overflow:ellipsis;white-space:nowrap}
.picker-meta{font-size:11.5px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.picker-item:has(input:checked){background:var(--tint)}
.picker-empty{padding:22px;text-align:center;color:var(--muted);font-size:13px}

/* ============ 分组 ============ */
.group-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:12px}
.gcard{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);padding:13px 14px;
  display:flex;flex-direction:column;gap:10px}
.gcard.mine{border-color:var(--deep);box-shadow:inset 0 0 0 1px var(--deep)}
.gcard-head{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.gcard-name{font-weight:700;font-size:15px}
.gcard-members{display:flex;flex-wrap:wrap;gap:6px;min-height:26px}
.member-chip{background:var(--surface-2);border:1px solid var(--line);border-radius:999px;
  padding:3px 10px;font-size:12.5px;color:var(--text-2)}
.member-chip.leader{background:var(--amber-soft);border-color:var(--accent-line);color:var(--accent-ink);font-weight:700}
.gcard-acts{display:flex;gap:6px;flex-wrap:wrap}
.nav-badge{margin-left:auto;background:var(--amber);color:var(--amber-ink);font-size:11px;font-weight:700;
  border-radius:999px;padding:1px 7px;min-width:18px;text-align:center}
@media (max-width:900px){
  .tab{position:relative}
  .nav-badge{position:absolute;top:2px;right:9px;margin-left:0}
  .group-grid{grid-template-columns:1fr}
}

/* 只读学生卡片：没有操作按钮时更紧凑 */
.scard.readonly{cursor:default}
.scard.readonly:hover{border-color:var(--line)}
.hint-banner.info{background:var(--primary-50);border-color:var(--tint-line);color:var(--deep)}

/* 菜单里的说明文字 */
.menu-hint{padding:9px 11px;font-size:12px;color:var(--muted);max-width:190px;line-height:1.5;
  border-top:1px solid var(--line);margin-top:4px}

/* 单班制的班级名 */
.side-class{display:flex;align-items:center;gap:6px;min-width:0}
.class-name{flex:1;min-width:0;font-weight:700;font-size:13.5px;color:var(--on-deep);
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
  background:rgba(255,255,255,.07);border-radius:var(--r-sm);padding:8px 10px}

/* 状态条：只放必要指标时收缩为紧凑一条 */
.stat-strip{display:inline-flex;width:auto}
.stat-cell{flex:none;padding:10px 22px}
@media (max-width:900px){
  .stat-strip{display:flex;width:100%}
  .stat-cell{flex:1}
}

/* ============ 批量预加减分（分数表） ============ */
.modal.wide{max-width:580px}
.scorelist{max-height:300px;overflow:auto;border:1px solid var(--line);border-radius:var(--r-sm);
  background:var(--surface-2);padding:4px}
.score-row{display:flex;align-items:center;gap:9px;padding:6px 9px;border-radius:8px;
  transition:background .13s var(--ease)}
.score-row+.score-row{margin-top:2px}
.score-row:hover{background:var(--hover)}
.score-row .sr-name{flex:1;min-width:0;font-weight:600;font-size:13.5px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.score-row .sr-meta{font-size:11.5px;color:var(--muted);flex:none;max-width:120px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.score-row input{width:82px;flex:none;text-align:center;padding:6px 8px;
  border:1px solid var(--line-strong);border-radius:7px;font:inherit;font-weight:700;
  font-variant-numeric:tabular-nums;background:var(--surface)}
.score-row input:focus{outline:none;border-color:var(--deep);box-shadow:0 0 0 3px rgba(18,63,58,.12)}
.score-row.filled{background:var(--plus-bg)}
.score-row.neg{background:var(--minus-bg)}

/* ============ 个人积分明细 ============ */
.scard-person{display:flex;align-items:center;gap:9px;flex:1;min-width:0;cursor:pointer;
  border-radius:9px;padding:2px 4px;margin:-2px -4px}
.scard-person:hover{background:var(--hover)}
.scard-person:hover .scard-name{text-decoration:underline;text-decoration-style:dotted}
.detail{display:flex;flex-direction:column;gap:12px}
.detail-head{display:flex;align-items:center;gap:10px}
.detail-name{font-weight:700;font-size:16px}
.detail-score{font-family:var(--serif);font-size:30px;font-weight:700;margin-left:auto;
  font-variant-numeric:tabular-nums;line-height:1}
.detail-score.pos{color:var(--plus)} .detail-score.neg{color:var(--minus)}
.detail-score.zero{color:var(--muted)}
.detail-sum{display:flex;gap:14px;flex-wrap:wrap;font-size:12.5px;color:var(--muted);
  border-top:1px dashed var(--line);border-bottom:1px dashed var(--line);padding:9px 0}
.detail-sum .plus{color:var(--plus)} .detail-sum .minus{color:var(--minus)}
.detail-list{max-height:320px;overflow:auto;border:1px solid var(--line);
  border-radius:var(--r-sm);background:var(--surface-2)}
.detail-list .row{cursor:default}
.detail-list .row:hover{background:var(--hover)}

/* 分组页里可点击查看明细 */
.member-chip{cursor:pointer;transition:background .13s var(--ease),border-color .13s var(--ease)}
.member-chip:hover{background:var(--tint);border-color:var(--tint-line);color:var(--deep)}
.detail-list .row,.card .row{cursor:pointer}

/* 排行榜可点 */
.podium-item{cursor:pointer;transition:transform .15s var(--ease),border-color .15s var(--ease)}
.podium-item:hover{border-color:var(--deep)}
.podium-item.p1:hover{transform:translateY(-10px)}
#ranking-body .row:hover .name{text-decoration:underline;text-decoration-style:dotted}

/* 记录明细页点名看明细 */
.name-link{cursor:pointer}
.name-link:hover{text-decoration:underline;text-decoration-style:dotted;color:var(--deep)}
#records-body .row:hover{background:var(--surface-2)}

/* 小组详情 / 返回按钮 */
.detail-back{display:flex;align-items:center;gap:10px;margin-bottom:4px}


/* 实时同步状态点 */
.live-dot{width:8px;height:8px;border-radius:50%;background:#7a8595;flex:none;
  transition:background .2s var(--ease),box-shadow .2s var(--ease)}
.live-dot.on{background:#43c07a;box-shadow:0 0 0 3px rgba(67,192,122,.2)}


/* 在线人数 / 断线提示 */
.online-chip{display:flex;align-items:center;gap:8px;width:100%;
  border:1px solid rgba(255,255,255,.14);background:rgba(255,255,255,.06);
  color:var(--on-deep-2);border-radius:var(--r-sm);padding:7px 10px;
  font:inherit;font-size:12.5px;font-weight:600;cursor:pointer;text-align:left}
.online-chip:hover{background:rgba(255,255,255,.12);color:#fff}
.online-chip b{color:#fff;font-variant-numeric:tabular-nums}
.hint-banner.warn{background:#fff6e5;border-color:#f0dcae;color:#8a6100}


/* 退出登录按钮（侧栏） */
#btn-logout:hover{background:rgba(200,70,60,.24);border-color:rgba(200,70,60,.4);color:#ffd9d5}
.inline-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.card-body + .card-body{border-top:1px solid var(--line)}

/* ============ 手机端布局修正（2026-10-11） ============ */
/* 问题：① 顶部班级名被挤到 20px 显示不全 ② 学生卡片姓名被挤成两三个字
   ③ 底部 8 个入口要横向滚动 ④ 排行榜姓名列被进度条挤掉 ⑤ 320px 小屏登录页溢出 */
@media (max-width: 900px) {
  /* 顶部栏：班级名优先，在线胶囊只留圆点和数字 */
  .sidebar { padding: 0 10px; gap: 8px; }
  .class-name { min-width: 92px; font-size: 13px; }
  .online-chip { padding: 5px 9px; gap: 4px; }
  .online-chip .oc-label { display: none; }
  .side-brand .brand-mark { width: 28px; height: 28px; }
  .side-create { width: auto; flex: none; padding: 7px 9px; }
  .side-create span { display: none; }

  /* 学生卡片：手机上单列，按钮同一行、窄屏自动换行，姓名不再被挤 */
  .card-grid { grid-template-columns: 1fr; gap: 8px; }
  .scard { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; padding: 10px 12px; }
  .scard-top { flex: 1 1 180px; min-width: 0; }
  .scard-name { font-size: 15px; }
  .scard-acts { flex: 0 0 auto; margin-left: auto; gap: 6px; }
  .scard-acts .btn { width: 46px; padding: 8px 0; font-size: 13.5px; }

  /* 排行榜：进度条让位给姓名 */
  .row { gap: 8px; padding: 9px 11px; }
  .row .name { flex: 2 1 auto; font-size: 14px; }
  .row .bar { flex: 1 1 34px; min-width: 34px; }
}

@media (max-width: 560px) {
  /* 底部导航改成两行四列，8 个入口全部直接可见，不用横向滚 */
  .side-nav { height: auto; display: grid; grid-template-columns: repeat(4, 1fr); gap: 3px;
    padding: 6px; overflow: visible; }
  .tab { flex: none; flex-direction: column; gap: 2px; font-size: 10.5px; padding: 7px 2px;
    min-width: 0; }
  .tab svg { width: 18px; height: 18px; }
  main { padding: 66px 12px 138px; }
  #user-menu { top: 44px; bottom: auto; }
  .menu { max-width: calc(100vw - 24px); }

  /* 登录页：小屏不再溢出，营销区收紧 */
  .auth { padding: 14px; }
  .auth-panel { max-width: 100%; }
  .auth-form { padding: 20px 16px; }
  .auth-side { padding: 20px 18px; }
  .auth-side h1 { font-size: 21px; margin: 12px 0 8px; }
  .auth-submit, .btn-lg { font-size: 14.5px; }
}

@media (max-width: 360px) {
  /* 超小屏：直接只留登录表单 */
  .auth-side { display: none; }
  .tab { font-size: 10px; }
  .class-name { min-width: 72px; font-size: 12px; }
}.user-meta { width: 150px; flex: none; }
/* 账号管理行：手机上分三行显示，姓名不再被挤成一个字 */
@media (max-width: 900px) {
  #users-body .row { flex-wrap: wrap; }
  #users-body .row .name { flex: 1 1 100%; font-size: 15px; }
  #users-body .row .user-meta { width: auto; flex: 0 1 auto; font-size: 12px; }
  #users-body .row .row-actions { flex: 1 1 auto; }
}
/* 超窄屏只显示班级名字，不显示「· N 人」，避免截断 */
@media (max-width: 420px) {
  .class-name .cn-count { display: none; }
}
/* ============ 登录表单 & 触摸目标（2026-10-11） ============ */
/* 之前登录页的输入框没套到样式，只有 21px 高，手机难点 */
.auth-form .field input {
  width: 100%; padding: 12px 13px; border: 1px solid var(--line-strong);
  border-radius: var(--r-sm); background: var(--surface); color: var(--text);
  font: inherit; font-size: 16px;   /* 16px：iOS 聚焦时不会自动放大页面 */
}
.auth-form .field input:focus { outline: 2px solid var(--tint-line); border-color: var(--brand); }
.auth-form .captcha-row input { flex: 1; width: auto; }

@media (max-width: 900px) {
  /* 卡片右侧的 −1 / +1 / +5 之前只有 15px 宽，手指点不准 */
  .scard-acts { min-width: 152px; }
  .scard-acts .chip-btn { flex: 1; min-height: 42px; min-width: 44px; font-size: 14px; padding: 8px 0; }
  /* 列表里的小按钮（编辑/删除/撤销）也放大到能点 */
  .btn.small { padding: 8px 12px; font-size: 13px; min-height: 36px; }
  .action-bar .btn { min-height: 38px; padding: 8px 13px; }
  .ab-field .input { min-height: 38px; }
}
/* ============ 窄屏收尾（2026-10-11 第二版） ============ */
/* 登录页：320px 屏幕上表单内容曾撑到 378px 导致溢出，这里允许收缩 */
.auth-panel > * { min-width: 0; }
.auth-form { min-width: 0; }
.captcha-row { min-width: 0; }
.captcha-row input { min-width: 0; }

/* 记录行的事由列改用 class（原来是行内样式） */
.rec-reason { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

@media (max-width: 420px) {
  .captcha-img { width: 104px; height: 42px; }
}

@media (max-width: 560px) {
  /* 手机上记录行分两行：姓名/分数/类别一行，事由单独一行，不再被挤成一条线 */
  #recent-list .row { flex-wrap: wrap; row-gap: 4px; }
  #recent-list .row .rec-reason { flex: 1 1 100%; white-space: normal; }
  #recent-list .row .btn.small { flex: 0 0 auto; margin-left: auto; }
}
/* ============ 记录明细 / 预加减分 事由列（2026-10-11 第三版） ============ */
.row-reason { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
@media (max-width: 900px) {
  /* 手机上事由单独一行，不再被挤成十几个像素 */
  #records-body .row, #request-list .row { flex-wrap: wrap; row-gap: 4px; }
  #records-body .row .row-reason, #request-list .row .row-reason { flex: 1 1 100%; white-space: normal; }
}
/* ============ 弹窗（积分明细 / 小组详情）手机端排布（2026-10-11 第四版） ============ */
@media (max-width: 560px) {
  /* 给弹窗更多可用宽度 */
  .modal-head { padding: 13px 14px; }
  .modal-body { padding: 14px 12px; }
  .modal-foot { padding: 11px 14px; }

  .detail { gap: 10px; }
  .detail-head { gap: 8px; }
  .detail-name { font-size: 17px; }
  .detail-score { font-size: 27px; line-height: 1.18; margin-left: auto; }
  .detail-sum { gap: 6px 12px; }
  .detail-sum span { flex: 1 1 auto; white-space: nowrap; }

  /* 每条记录分两行：第一行「分数 + 类别」，第二行事由占满整行，不再被截断 */
  .detail-list { max-height: 52vh; }
  .detail-list .row { flex-wrap: wrap; row-gap: 5px; padding: 10px 12px; }
  .detail-list .row .muted {
    flex: 1 1 100%; white-space: normal; overflow: visible; text-overflow: clip;
  }
  .detail-list .row .tag { margin-left: auto; }

  /* 大字号的分数不要被行高切掉 */
  .scard-score { line-height: 1.18; }
}

/* ============ 多班级管理（v2.2.0） ============ */
.class-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 360px), 1fr));
  gap: 14px;
}
.class-card {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-1);
}
.class-card.active {
  border-color: var(--tint-line);
  box-shadow: inset 3px 0 0 var(--brand), var(--shadow-1);
}
.class-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  min-width: 0;
}
.class-card-head > div { min-width: 0; }
.class-card-head h3 {
  margin-bottom: 3px;
  color: var(--deep);
  font-size: 17px;
  overflow-wrap: anywhere;
}
.class-card-head .tag { flex: none; }
.class-invite {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 10px;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--tint-line);
  border-radius: var(--r-sm);
  background: var(--tint-soft);
}
.class-invite code {
  min-width: 0;
  color: var(--deep);
  font: 700 13px/1.5 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: .06em;
  overflow-wrap: anywhere;
}
.class-invite .btn { margin-left: auto; }
.class-card-meta {
  color: var(--text-2);
  font-size: 12.5px;
  overflow-wrap: anywhere;
}
.class-card .row-actions { margin-top: auto; }
.member-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 12px 0 16px;
  max-height: min(52vh, 520px);
  overflow-y: auto;
  padding-right: 3px;
}
.member-row {
  display: grid;
  grid-template-columns: 36px minmax(110px, 1fr) auto auto;
  align-items: center;
  gap: 10px;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--surface);
}
.member-name {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.member-name strong,
.member-name span { overflow-wrap: anywhere; }
.member-row .tag,
.member-row .chip { white-space: nowrap; }

@media (max-width: 560px) {
  .class-grid { grid-template-columns: 1fr; gap: 10px; }
  .class-card { padding: 14px; }
  .class-card-head { gap: 8px; }
  .class-card-head h3 { font-size: 16px; }
  .class-invite { align-items: flex-start; }
  .class-invite .btn { width: 100%; min-height: 44px; margin-left: 0; }
  .class-card .row-actions { gap: 8px; }
  .class-card .row-actions .btn { flex: 1 1 calc(50% - 8px); min-height: 44px; }
  .member-list { max-height: none; overflow: visible; padding-right: 0; }
  .member-row {
    grid-template-columns: 34px minmax(0, 1fr) auto;
    gap: 8px 10px;
    padding: 11px;
  }
  .member-row .chip {
    grid-column: 2 / -1;
    justify-self: start;
    white-space: normal;
  }
  .member-row .tag { min-height: 28px; display: inline-flex; align-items: center; }
}