:root{--bg-deep:#050b1a;--bg:#0a1224;--panel:#0f1b35;--panel-2:#142246;--line:rgba(148,163,184,.18);--line-soft:rgba(148,163,184,.10);--text:#e2e8f0;--text-soft:#cbd5e1;--text-mute:#94a3b8;--blue:#3b82f6;--cyan:#22d3ee;--orange:#f59e0b;--gold:#fbbf24;--green:#10b981;--red:#ef4444;--purple:#8b5cf6;--r-md:12px;--r-lg:18px}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{overflow-x:hidden}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif;background:radial-gradient(ellipse 80% 50% at 50% -10%,rgba(59,130,246,.15) 0%,transparent 60%),radial-gradient(ellipse 60% 40% at 100% 100%,rgba(34,211,238,.08) 0%,transparent 60%),var(--bg-deep);color:var(--text);line-height:1.5;-webkit-font-smoothing:antialiased;min-height:100vh;overflow-x:hidden}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;font-weight:700;color:var(--text);letter-spacing:-.01em}
.topbar{position:sticky;top:0;z-index:50;background:rgba(10,18,36,.85);backdrop-filter:saturate(160%) blur(12px);-webkit-backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid var(--line)}
.topbar-inner{max-width:1320px;margin:0 auto;padding:14px 28px;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:12px}
.brand-mark{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--blue),var(--cyan));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:17px;box-shadow:0 4px 12px rgba(59,130,246,.4)}
.brand-text{line-height:1.2}
.brand-text h1{font-size:17px;font-weight:700}
.brand-text small{display:block;font-size:11.5px;color:var(--text-mute);letter-spacing:.05em;margin-top:2px}
.topnav{display:flex;gap:6px;margin-left:auto}
.topnav a{padding:9px 16px;border-radius:8px;font-size:13.5px;font-weight:500;color:var(--text-soft);transition:all .15s ease}
.topnav a:hover{background:rgba(59,130,246,.12);color:var(--text)}
.topnav a.current{background:linear-gradient(135deg,rgba(59,130,246,.2),rgba(34,211,238,.15));color:#fff;font-weight:600;box-shadow:inset 0 0 0 1px rgba(59,130,246,.35)}
.topbar-meta{display:flex;align-items:center;gap:10px;padding-left:18px;border-left:1px solid var(--line)}
.live-dot{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 8px var(--green);animation:pulse 2s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.55}}
.clock{font-size:12.5px;color:var(--text-soft);font-variant-numeric:tabular-nums;font-weight:600}
.clock small{display:block;color:var(--text-mute);font-size:10.5px;font-weight:500;margin-top:1px;letter-spacing:.04em}
.wrap{max-width:1320px;margin:0 auto;padding:28px 28px 48px}
.hero-strip{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:18px;padding:22px 26px;border-radius:var(--r-lg);background:linear-gradient(135deg,rgba(59,130,246,.12),rgba(34,211,238,.06));border:1px solid var(--line);margin-bottom:24px}
.hero-strip h2{font-size:22px}
.hero-strip .sub{color:var(--text-mute);font-size:13px;margin-top:4px}
.hero-strip .meta-row{display:flex;gap:22px;flex-wrap:wrap}
.hero-strip .meta-it{font-size:12.5px;color:var(--text-soft)}
.hero-strip .meta-it b{color:var(--cyan);font-weight:700;margin-right:6px;font-variant-numeric:tabular-nums}
.kpi-row{display:grid;grid-template-columns:repeat(6,1fr);gap:14px;margin-bottom:22px}
.kpi-card{position:relative;background:linear-gradient(180deg,var(--panel),rgba(15,27,53,.5));border:1px solid var(--line);border-radius:var(--r-md);padding:18px 18px 16px;overflow:hidden;transition:transform .15s ease,border-color .15s ease}
.kpi-card:hover{transform:translateY(-2px);border-color:rgba(59,130,246,.45)}
.kpi-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:linear-gradient(180deg,var(--blue),var(--cyan))}
.kpi-card.k-orange::before{background:linear-gradient(180deg,var(--orange),var(--gold))}
.kpi-card.k-green::before{background:linear-gradient(180deg,var(--green),#34d399)}
.kpi-card.k-purple::before{background:linear-gradient(180deg,var(--purple),#a78bfa)}
.kpi-card.k-red::before{background:linear-gradient(180deg,var(--red),#f87171)}
.kpi-card.k-cyan::before{background:linear-gradient(180deg,var(--cyan),#67e8f9)}
.kpi-label{font-size:12.5px;color:var(--text-mute);font-weight:500;letter-spacing:.04em;margin-bottom:6px}
.kpi-value{font-size:30px;font-weight:800;letter-spacing:-.02em;font-variant-numeric:tabular-nums;color:var(--text);line-height:1.05}
.kpi-value .unit{font-size:14px;color:var(--text-mute);margin-left:3px;font-weight:600}
.kpi-sub{font-size:11.5px;color:var(--text-mute);margin-top:8px;display:flex;align-items:center;gap:6px}
.kpi-sub .delta-up{color:var(--green);font-weight:700}
.kpi-sub .delta-dn{color:var(--red);font-weight:700}
.kpi-spark{margin-top:8px;height:24px}
.kpi-spark path{fill:none;stroke-width:1.5}.kpi-card.k-blue .kpi-spark path,.kpi-card.k-cyan .kpi-spark path{stroke:var(--cyan)}.kpi-card.k-orange .kpi-spark path{stroke:var(--orange)}.kpi-card.k-green .kpi-spark path{stroke:var(--green)}.kpi-card.k-purple .kpi-spark path{stroke:#a78bfa}.kpi-card.k-red .kpi-spark path{stroke:var(--red)}.kpi-card .kpi-spark .fill{fill:rgba(56,189,248,.08);stroke:none}
.jump-row{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;margin-bottom:24px}
.jump-card{position:relative;background:linear-gradient(135deg,var(--panel),var(--panel-2));border:1px solid var(--line);border-radius:var(--r-lg);padding:26px 24px;display:flex;flex-direction:column;gap:14px;transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease;cursor:pointer}
.jump-card:hover{transform:translateY(-4px);border-color:rgba(59,130,246,.5);box-shadow:0 6px 14px rgba(0,0,0,.5),0 18px 40px rgba(56,189,248,.10)}
.jump-card.jc-admin{border-top:3px solid var(--blue)}
.jump-card.jc-teach{border-top:3px solid var(--cyan)}
.jump-card.jc-student{border-top:3px solid var(--orange)}
.jump-card.jc-llm{border-top:3px solid var(--green)}
.jump-card.jc-debug{border-top:3px solid var(--purple)}
.jump-card.jc-admin .jump-icon{background:rgba(59,130,246,.12);color:var(--blue)}
.jump-card.jc-teach .jump-icon{background:rgba(34,211,238,.12);color:var(--cyan)}
.jump-card.jc-student .jump-icon{background:rgba(245,158,11,.12);color:var(--orange)}
.jump-card.jc-llm .jump-icon{background:rgba(16,185,129,.12);color:var(--green)}
.jump-card.jc-debug .jump-icon{background:rgba(139,92,246,.12);color:#a78bfa}
.jump-icon{width:54px;height:54px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:26px}
.jump-card.jc-teach .jump-icon{background:rgba(34,211,238,.12);color:var(--cyan)}
.jump-card.jc-student .jump-icon{background:rgba(245,158,11,.12);color:var(--orange)}
.jump-card.jc-debug .jump-icon{background:rgba(139,92,246,.12);color:#a78bfa}
.jump-card h3{font-size:18px;font-weight:700}
.jump-card .desc{font-size:13px;color:var(--text-mute);line-height:1.6}
.jump-card .stats{display:flex;gap:18px;font-size:12.5px;color:var(--text-soft);flex-wrap:wrap}
.jump-card .stats b{color:var(--text);font-variant-numeric:tabular-nums}
.jump-card .arrow{position:absolute;right:20px;top:24px;font-size:22px;color:var(--text-mute);transition:transform .18s ease}
.jump-card:hover .arrow{transform:translateX(4px);color:var(--cyan)}
.panels-row{display:grid;grid-template-columns:1.55fr 1fr;gap:16px;margin-bottom:24px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--r-md);padding:20px 22px}
.panel-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:14px}
.panel-head h3{font-size:16px;font-weight:700}
.panel-head .hint{font-size:11.5px;color:var(--text-mute);letter-spacing:.04em}
.kgraph{width:100%;height:380px;display:block}
.kgraph .edge{stroke:rgba(148,163,184,.22);stroke-width:1;fill:none}
.kgraph .node-circle{transition:filter .15s ease;cursor:pointer}
.kgraph .node-circle:hover{filter:brightness(1.2) drop-shadow(0 0 8px currentColor)}
.kgraph .node-label{fill:var(--text);font-size:12.5px;font-weight:600;text-anchor:middle;pointer-events:none}.kgraph .node-meta{fill:var(--text-mute);font-size:10.5px;text-anchor:middle;pointer-events:none}.kgraph .legend{font-size:11px;fill:var(--text-mute)}
.lb-list{display:flex;flex-direction:column;gap:9px}
.lb-row{display:grid;grid-template-columns:28px 1fr 64px 90px;align-items:center;gap:10px}
.lb-rank{width:24px;height:24px;border-radius:6px;display:flex;align-items:center;justify-content:center;background:rgba(59,130,246,.16);color:var(--cyan);font-size:12px;font-weight:700}
.lb-rank.r1{background:linear-gradient(135deg,#fbbf24,#f59e0b);color:#0a1224}
.lb-rank.r2{background:linear-gradient(135deg,#cbd5e1,#94a3b8);color:#0a1224}
.lb-rank.r3{background:linear-gradient(135deg,#d97706,#b45309);color:#fff}
.lb-name{font-size:13.5px;color:var(--text);font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lb-name small{display:block;font-size:11px;color:var(--text-mute);margin-top:1px}
.lb-bar-wrap{height:8px;border-radius:99px;background:rgba(148,163,184,.10);overflow:hidden}
.lb-bar{height:100%;background:linear-gradient(90deg,var(--blue),var(--cyan));border-radius:99px}
.lb-val{font-size:13px;color:var(--text);font-weight:700;text-align:right;font-variant-numeric:tabular-nums}
.foot{margin-top:32px;padding-top:24px;border-top:1px solid var(--line-soft);display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;font-size:12px;color:var(--text-mute)}
.foot b{color:var(--text-soft);font-weight:600}
.foot .ts{font-variant-numeric:tabular-nums}
@media (max-width:1280px){.jump-row{grid-template-columns:repeat(3,1fr)}}
@media (max-width:1100px){.kpi-row{grid-template-columns:repeat(3,1fr)}.jump-row{grid-template-columns:repeat(2,1fr)}.panels-row{grid-template-columns:1fr}}
@media (max-width:760px){.topbar-inner{flex-wrap:wrap;gap:14px;padding:12px 18px}.topnav{order:3;width:100%;justify-content:flex-start;overflow-x:auto}.topnav a{min-height:44px;display:inline-flex;align-items:center}.topbar-meta{padding-left:0;border-left:none}.wrap{padding:18px 16px 36px}.hero-strip{padding:18px 20px}.hero-strip h2{font-size:clamp(18px,5vw,22px)}.kpi-row{grid-template-columns:repeat(2,1fr);gap:10px}.kpi-value{font-size:24px}.kpi-card{min-height:44px}.jump-row{grid-template-columns:1fr}.jump-card{min-height:44px}.lb-row{grid-template-columns:24px 1fr 70px}.lb-bar-wrap{display:none}.kgraph{height:300px}.tool-pill{min-height:44px}}
@media (max-width:420px){.kpi-row{grid-template-columns:1fr 1fr}.kpi-card{padding:14px;min-height:44px}.kpi-value{font-size:clamp(20px,6vw,22px)}.jump-card{padding:20px}.brand-text h1{font-size:clamp(15px,4.4vw,17px)}.brand-text small{font-size:clamp(10.5px,3.4vw,11.5px)}}
@media (max-width:360px){.kpi-row{grid-template-columns:1fr}.kpi-value{font-size:clamp(20px,7vw,22px)}}

/* ===== tools-row（运维 & 健康入口） ===== */
.tools-row{margin-bottom:24px;padding:18px 22px;background:linear-gradient(180deg,var(--panel),rgba(15,27,53,.5));border:1px solid var(--line);border-radius:var(--r-lg)}
.tools-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:12px;flex-wrap:wrap;gap:8px}
.tools-head h3{font-size:15px;font-weight:700;color:var(--text)}
.tools-head .hint{font-size:12px;color:var(--text-mute)}
.tools-head .hint b{color:var(--cyan);font-variant-numeric:tabular-nums}
.tools-grid{display:flex;flex-wrap:wrap;gap:10px}
.tool-pill{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;background:rgba(255,255,255,.04);border:1px solid var(--line);border-radius:999px;font-size:13px;color:var(--text-soft);transition:all .15s ease}
.tool-pill:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(34,211,238,.08);transform:translateY(-1px)}
@media (max-width:760px){.tools-row{padding:14px 16px}.tool-pill{font-size:12px;padding:6px 10px}}

/* ===== topbar link buttons (登录/注册) ===== */
.topbar-link{padding:8px 16px;border-radius:8px;font-size:13.5px;font-weight:600;border:1px solid var(--line);color:var(--text-soft);transition:all .15s ease;display:inline-flex;align-items:center;gap:6px;min-height:38px}
.topbar-link:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(34,211,238,.06)}
.topbar-link.primary{background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;border-color:transparent}
.topbar-link.primary:hover{filter:brightness(1.1);color:#fff}
.topbar-link.logout{color:var(--text-mute)}
.topbar-link.logout:hover{color:var(--red);border-color:var(--red);background:rgba(239,68,68,.06)}

/* ===== brand hover effect ===== */
.brand-link{display:flex;align-items:center;gap:12px;padding:6px 12px;border-radius:10px;border:1px solid transparent;transition:all .15s ease;text-decoration:none;color:inherit}
.brand-link:hover{border-color:rgba(59,130,246,.5);background:rgba(59,130,246,.06)}

/* ===== hero home (新首页) ===== */
.home-hero{padding:48px 32px;background:linear-gradient(135deg,rgba(59,130,246,.12),rgba(34,211,238,.06));border:1px solid var(--line);border-radius:var(--r-lg);margin-bottom:28px;text-align:center}
.home-hero h2{font-size:clamp(24px,5vw,36px);margin-bottom:8px;background:linear-gradient(135deg,var(--blue),var(--cyan));-webkit-background-clip:text;background-clip:text;color:transparent}
.home-hero p{color:var(--text-mute);font-size:14px;max-width:600px;margin:0 auto}

/* ===== card small extras ===== */
.card-disabled{opacity:.55;pointer-events:none;position:relative}
.card-disabled::after{content:"🔒";position:absolute;top:18px;right:18px;font-size:18px}

/* ===== form ===== */
.form-wrap{max-width:480px;margin:0 auto;padding:32px 28px;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:0 8px 24px rgba(0,0,0,.3)}
.form-wrap.wide{max-width:880px}
.form-title{font-size:22px;margin-bottom:6px;text-align:center}
.form-sub{color:var(--text-mute);font-size:13px;margin-bottom:24px;text-align:center}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field label{font-size:13px;color:var(--text-soft);font-weight:600}
.field input,.field select{width:100%;padding:11px 14px;background:rgba(15,27,53,.6);border:1px solid var(--line);border-radius:8px;color:var(--text);font-size:14px;font-family:inherit;transition:border-color .15s ease;min-height:44px}
.field input:focus,.field select:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(34,211,238,.12)}
.field input::placeholder{color:var(--text-mute)}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:520px){.field-row{grid-template-columns:1fr}}
.btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:8px;width:100%;padding:13px 24px;background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;border:0;border-radius:8px;font-size:14.5px;font-weight:700;cursor:pointer;transition:filter .15s ease,transform .15s ease;min-height:48px;font-family:inherit}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-1px)}
.btn-primary:disabled{opacity:.6;cursor:not-allowed;transform:none}
.btn-ghost{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 18px;background:transparent;color:var(--text-soft);border:1px solid var(--line);border-radius:8px;font-size:13.5px;font-weight:600;cursor:pointer;transition:all .15s ease;min-height:44px;font-family:inherit}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(34,211,238,.06)}
.btn-success{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 18px;background:rgba(16,185,129,.14);color:var(--green);border:1px solid rgba(16,185,129,.4);border-radius:8px;font-size:13px;font-weight:700;cursor:pointer;transition:all .15s ease;min-height:40px;font-family:inherit}
.btn-success:hover{background:rgba(16,185,129,.22)}
.btn-danger{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 18px;background:rgba(239,68,68,.14);color:var(--red);border:1px solid rgba(239,68,68,.4);border-radius:8px;font-size:13px;font-weight:700;cursor:pointer;transition:all .15s ease;min-height:40px;font-family:inherit}
.btn-danger:hover{background:rgba(239,68,68,.22)}
.form-foot{text-align:center;margin-top:18px;font-size:13px;color:var(--text-mute)}
.form-foot a{color:var(--cyan);font-weight:600}
.form-foot a:hover{text-decoration:underline}
.alert{padding:12px 16px;border-radius:8px;font-size:13.5px;margin-bottom:16px;display:flex;align-items:center;gap:8px;line-height:1.5}
.alert-success{background:rgba(16,185,129,.12);color:#34d399;border:1px solid rgba(16,185,129,.35)}
.alert-error{background:rgba(239,68,68,.12);color:#f87171;border:1px solid rgba(239,68,68,.35)}
.alert-info{background:rgba(34,211,238,.1);color:#67e8f9;border:1px solid rgba(34,211,238,.3)}

/* ===== page-title-with-back ===== */
.page-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:20px}
.page-head h2{font-size:clamp(20px,3vw,26px);margin-bottom:4px}
.page-head .sub{color:var(--text-mute);font-size:13px}
.back-home{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;background:rgba(255,255,255,.04);border:1px solid var(--line);border-radius:8px;font-size:13px;color:var(--text-soft);font-weight:600;transition:all .15s ease}
.back-home:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(34,211,238,.06)}

/* ===== tabs ===== */
.tabs{display:flex;gap:6px;border-bottom:1px solid var(--line);margin-bottom:20px;overflow-x:auto}
.tab{padding:11px 18px;font-size:13.5px;font-weight:600;color:var(--text-mute);cursor:pointer;border-bottom:2px solid transparent;transition:all .15s ease;white-space:nowrap;background:transparent;border-left:0;border-right:0;border-top:0;font-family:inherit}
.tab:hover{color:var(--text-soft)}
.tab.active{color:var(--cyan);border-bottom-color:var(--cyan)}
.tab .badge-count{display:inline-flex;align-items:center;justify-content:center;min-width:22px;height:22px;padding:0 7px;margin-left:8px;background:rgba(245,158,11,.18);color:var(--orange);border-radius:99px;font-size:11.5px;font-weight:700}

/* ===== table ===== */
.tbl-wrap{background:var(--panel);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden}
.tbl{width:100%;border-collapse:collapse;font-size:13.5px}
.tbl th{text-align:left;padding:12px 16px;background:rgba(15,27,53,.5);color:var(--text-mute);font-size:11.5px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;border-bottom:1px solid var(--line)}
.tbl td{padding:13px 16px;border-bottom:1px solid var(--line-soft);color:var(--text)}
.tbl tr:last-child td{border-bottom:0}
.tbl tr:hover td{background:rgba(59,130,246,.04)}
.role-pill{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:99px;font-size:11.5px;font-weight:700}
.role-pill.teacher{background:rgba(34,211,238,.12);color:var(--cyan)}
.role-pill.student{background:rgba(245,158,11,.12);color:var(--orange)}
.role-pill.admin{background:rgba(139,92,246,.16);color:#a78bfa}
.status-pill{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:99px;font-size:11.5px;font-weight:700}
.status-pill.approved{background:rgba(16,185,129,.14);color:#34d399}
.status-pill.pending{background:rgba(245,158,11,.14);color:var(--orange)}
.status-pill.rejected{background:rgba(239,68,68,.14);color:#f87171}

.empty-state{padding:48px 24px;text-align:center;color:var(--text-mute)}
.empty-state .emoji{font-size:36px;margin-bottom:8px;opacity:.7}
.empty-state h3{font-size:16px;color:var(--text-soft);margin-bottom:6px}

/* ===== back-home inline ===== */
.back-home.in-text{margin-bottom:20px}

/* ===== responsive form ===== */
@media (max-width:520px){.form-wrap{padding:24px 18px}.home-hero{padding:32px 18px}}