:root{
  --bg:#f5f6f8;
  --surface:#ffffff;
  --line:#e4e7ec;
  --text:#1c2430;
  --text-2:#5b6778;
  --text-3:#8b96a7;
  --brand:#2b5cff;
  --brand-weak:#eef3ff;
  --ok:#12805c;
  --ok-weak:#e8f6f0;
  --warn:#b45309;
  --warn-weak:#fff5e6;
  --danger:#c0392b;
  --danger-weak:#fdeeec;
  --radius:10px;
  --shadow:0 1px 2px rgba(16,24,40,.06),0 1px 3px rgba(16,24,40,.05);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:14px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none}
h1,h2,h3,h4{margin:0;font-weight:600}
.muted{color:var(--text-2);font-size:13px}
.empty{color:var(--text-3);text-align:center;padding:48px 0}

/* 顶栏 */
.topbar{
  height:56px;display:flex;align-items:center;gap:24px;
  padding:0 20px;background:var(--surface);
  border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50;
}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo{
  width:28px;height:28px;border-radius:8px;background:var(--brand);color:#fff;
  display:grid;place-items:center;font-weight:600;font-size:14px;
}
.logo-lg{width:52px;height:52px;border-radius:14px;font-size:22px;margin:0 auto 16px}
.brand-name{font-weight:600;font-size:15px;white-space:nowrap}
.nav{display:flex;gap:4px;flex:1;overflow-x:auto}
.nav a{
  padding:6px 12px;border-radius:8px;color:var(--text-2);font-size:13px;white-space:nowrap;
}
.nav a:hover{background:var(--bg);color:var(--text)}
.nav a.on{background:var(--brand-weak);color:var(--brand);font-weight:500}
.userbox{display:flex;align-items:center;gap:10px;flex-shrink:0}
.uname{font-size:13px;font-weight:500}
.role{font-size:11px;padding:2px 8px;border-radius:999px;background:var(--bg);color:var(--text-2)}
.role-judge{background:var(--brand-weak);color:var(--brand)}
.role-admin{background:var(--warn-weak);color:var(--warn)}
.role-super{background:var(--ok-weak);color:var(--ok)}
.link-quiet{font-size:12px;color:var(--text-3)}
.link-quiet:hover{color:var(--brand)}

.page{max-width:1280px;margin:0 auto;padding:24px 20px 64px}
.page-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:20px;flex-wrap:wrap}
.page-head h2{font-size:18px;margin-bottom:4px}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  height:34px;padding:0 14px;border-radius:8px;border:1px solid var(--line);
  background:var(--surface);color:var(--text);font-size:13px;cursor:pointer;
  font-family:inherit;transition:.15s;
}
.btn:hover{border-color:#c9cfd8;background:#fafbfc}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn-primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn-primary:hover{background:#1f4ce0;border-color:#1f4ce0}
.btn-ghost{border-color:transparent;background:transparent;color:var(--text-2)}
.btn-ghost:hover{background:var(--bg)}
.btn-danger{color:var(--danger);border-color:#f0c9c4}
.btn-danger:hover{background:var(--danger-weak)}
.btn-sm{height:28px;padding:0 10px;font-size:12px}
.btn-block{width:100%;height:40px;font-size:14px}

/* 卡片 */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.card-pad{padding:20px}
.card-head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:16px 20px;border-bottom:1px solid var(--line);
}
.card-head h2{font-size:15px}
.card-body{padding:20px}

/* 表单 */
.field{display:block;margin-bottom:14px}
.field > span{display:block;font-size:13px;color:var(--text-2);margin-bottom:6px}
input[type=text],input[type=password],input[type=number],select,textarea{
  width:100%;height:38px;padding:0 12px;border:1px solid var(--line);border-radius:8px;
  font-size:14px;font-family:inherit;color:var(--text);background:var(--surface);
  transition:.15s;
}
textarea{height:auto;padding:10px 12px;resize:vertical;min-height:72px}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(43,92,255,.12)}
.err{color:var(--danger);font-size:13px;min-height:20px;margin-bottom:8px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:720px){.row2{grid-template-columns:1fr}}

/* 登录页 */
.login-body{min-height:100vh;display:grid;place-items:center;background:var(--bg);padding:20px}
.login-card{
  width:100%;max-width:380px;background:var(--surface);border:1px solid var(--line);
  border-radius:16px;padding:36px 32px 28px;box-shadow:0 8px 24px rgba(16,24,40,.06);
}
.login-head{text-align:center;margin-bottom:24px}
.login-head h1{font-size:18px;margin-bottom:6px}
.login-foot{text-align:center;color:var(--text-3);font-size:12px;margin:20px 0 0}

/* 案例卡片 */
.case-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.case-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;cursor:pointer;transition:.18s;display:flex;flex-direction:column;
}
.case-card:hover{border-color:#c9d3e8;box-shadow:0 4px 14px rgba(16,24,40,.08);transform:translateY(-1px)}
.case-thumb{
  height:150px;background:#eef1f6 center/cover no-repeat;position:relative;
  display:grid;place-items:center;color:var(--text-3);font-size:13px;
}
.case-thumb .badge-done{
  position:absolute;top:10px;right:10px;background:var(--ok);color:#fff;
  font-size:11px;padding:3px 9px;border-radius:999px;
}
.case-meta{padding:14px 16px 16px;flex:1;display:flex;flex-direction:column;gap:6px}
.case-school{font-size:12px;color:var(--brand);font-weight:500}
.case-title{font-size:14px;font-weight:500;line-height:1.4}
.progress-wrap{margin-top:auto;padding-top:10px}
.progress-bar{height:5px;background:var(--bg);border-radius:999px;overflow:hidden}
.progress-bar i{display:block;height:100%;background:var(--brand);border-radius:999px;transition:width .3s}
.progress-bar i.done{background:var(--ok)}
.progress-txt{display:flex;justify-content:space-between;font-size:11px;color:var(--text-3);margin-top:5px}

/* 评分页 */
.score-layout{display:grid;grid-template-columns:1.35fr 1fr;gap:20px;align-items:start}
@media(max-width:960px){.score-layout{grid-template-columns:1fr}}
.player-box{background:#0b1017;border-radius:var(--radius);overflow:hidden;position:relative}
.player-box video{width:100%;display:block;max-height:62vh;background:#000}
.video-empty{padding:60px 20px;text-align:center;color:#8b96a7;font-size:13px}

.score-item{
  padding:14px 0;border-bottom:1px solid var(--line);
}
.score-item:last-child{border-bottom:none}
.score-item-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px;margin-bottom:4px}
.score-item-name{font-size:14px;font-weight:500}
.score-item-desc{font-size:12px;color:var(--text-3);margin-bottom:10px}
.score-input-row{display:flex;align-items:center;gap:10px}
.score-input{
  width:110px;height:40px;text-align:center;font-size:17px;font-weight:600;
  border:1px solid var(--line);border-radius:8px;
}
.score-input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(43,92,255,.12);outline:none}
.score-input.saved{border-color:#b7e4d0;background:#f4fdf9}
.score-input.locked{background:var(--bg);color:var(--text-2)}
.max-tag{font-size:12px;color:var(--text-3)}
.save-state{font-size:12px;color:var(--ok);opacity:0;transition:opacity .3s}
.save-state.on{opacity:1}

.total-bar{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 20px;background:var(--surface);border-top:1px solid var(--line);
  position:sticky;bottom:0;
}
.total-num{font-size:26px;font-weight:600;color:var(--brand)}
.total-num small{font-size:13px;color:var(--text-3);font-weight:400}

/* 表格 */
.table-wrap{overflow-x:auto}
table.tbl{width:100%;border-collapse:collapse;font-size:13px}
table.tbl th,table.tbl td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap}
table.tbl th{color:var(--text-2);font-weight:500;background:#fafbfc;font-size:12px}
table.tbl tbody tr:hover{background:#fafbfc}
table.tbl td.num{text-align:right;font-variant-numeric:tabular-nums}
.rank-no{display:inline-grid;place-items:center;width:24px;height:24px;border-radius:7px;background:var(--bg);font-weight:600;font-size:12px}
.rank-no.r1{background:#fff3d6;color:#a06a00}
.rank-no.r2{background:#eef1f6;color:#5b6778}
.rank-no.r3{background:#fbe9e0;color:#a34e2a}
.pill{display:inline-block;padding:2px 9px;border-radius:999px;font-size:11px}
.pill-ok{background:var(--ok-weak);color:var(--ok)}
.pill-warn{background:var(--warn-weak);color:var(--warn)}
.pill-mute{background:var(--bg);color:var(--text-3)}

/* 统计卡 */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:20px}
@media(max-width:900px){.stats{grid-template-columns:repeat(2,1fr)}}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}
.stat .k{font-size:12px;color:var(--text-3);margin-bottom:6px}
.stat .v{font-size:24px;font-weight:600;font-variant-numeric:tabular-nums}
.stat .v small{font-size:13px;color:var(--text-3);font-weight:400}

.seg{display:inline-flex;background:var(--bg);border-radius:8px;padding:3px}
.seg button{
  border:none;background:transparent;padding:6px 14px;border-radius:6px;
  font-size:13px;color:var(--text-2);cursor:pointer;font-family:inherit;
}
.seg button.on{background:var(--surface);color:var(--text);font-weight:500;box-shadow:var(--shadow)}

/* toast */
.toast{
  position:fixed;left:50%;bottom:32px;transform:translateX(-50%) translateY(12px);
  background:#1c2430;color:#fff;padding:10px 18px;border-radius:8px;font-size:13px;
  opacity:0;pointer-events:none;transition:.25s;z-index:999;
}
.toast.on{opacity:1;transform:translateX(-50%) translateY(0)}
.toast.err{background:var(--danger)}

/* modal */
.modal-mask{
  position:fixed;inset:0;background:rgba(16,24,40,.45);display:none;
  place-items:center;z-index:200;padding:20px;
}
.modal-mask.on{display:grid}
.modal{
  background:var(--surface);border-radius:14px;width:100%;max-width:520px;
  max-height:88vh;overflow:auto;box-shadow:0 20px 48px rgba(16,24,40,.2);
}
.modal-head{display:flex;justify-content:space-between;align-items:center;padding:18px 22px;border-bottom:1px solid var(--line)}
.modal-body{padding:22px}
.modal-foot{display:flex;justify-content:flex-end;gap:10px;padding:16px 22px;border-top:1px solid var(--line)}
.close-x{border:none;background:transparent;font-size:20px;color:var(--text-3);cursor:pointer;line-height:1}