:root{
  --brand:#5b3df5;
  --brand2:#7c5cff;
  --brand3:#9d7bff;
  --gold:#ffb84d;
  --gold-light:#ffe3b3;
  --gold-deep:#ff9d2e;
  --bg:#f6f4ff;
  --card:#fff;
  --line:#e8e3f5;
  --text:#2b2340;
  --sub:#8a80a0;
  --green:#2ecc71;
  --red:#ff6b6b;
  --shadow-sm:0 2px 6px rgba(91,61,245,.08),0 6px 20px rgba(91,61,245,.08);
  --shadow-md:0 6px 16px rgba(91,61,245,.12),0 16px 40px rgba(91,61,245,.12);
  --radius:16px;
  --gold-grad:linear-gradient(135deg,#ffd166,#ff9d2e);
  --brand-grad:linear-gradient(135deg,#7c5cff,#5b3df5);
}
*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family:'Noto Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  background:
    radial-gradient(circle at 12% 8%, rgba(124,92,255,.10), transparent 38%),
    radial-gradient(circle at 88% 90%, rgba(255,157,46,.08), transparent 42%),
    var(--bg);
  color:var(--text);min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
.topbar{
  background:linear-gradient(135deg,#5b3df5 0%,#7c5cff 55%,#9d7bff 100%);
  color:#fff;padding:15px 24px;display:flex;align-items:center;gap:14px;
  position:sticky;top:0;z-index:50;
  box-shadow:0 2px 14px rgba(91,61,245,.35);
  border-bottom:1px solid rgba(255,209,102,.5);
}
.topbar .logo{
  width:40px;height:40px;border-radius:12px;
  background:var(--gold-grad);
  display:flex;align-items:center;justify-content:center;
  font-size:22px;font-weight:700;color:#fff;
  box-shadow:0 2px 10px rgba(184,144,63,.45), inset 0 1px 0 rgba(255,255,255,.35);
  letter-spacing:0;
}
.topbar .school{font-size:17px;font-weight:600;letter-spacing:.04em}
.topbar .spacer{flex:1}
.topbar .back{color:#c6d0e4;cursor:pointer;font-size:14px;text-decoration:none;margin-right:12px;transition:.2s}
.topbar .back:hover{color:#fff}
.view{display:none;padding:24px;max-width:960px;margin:0 auto;animation:viewIn .25s ease}
.view.active{display:block}
@keyframes viewIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.role-switch{display:flex;gap:10px;justify-content:center;margin:16px auto 0;flex-wrap:wrap}
.role-btn{border:2px solid var(--line);background:#fff;color:var(--sub);padding:10px 22px;border-radius:30px;font-size:14px;cursor:pointer;font-weight:500;transition:.2s}
.role-btn.active{background:var(--brand);color:#fff;border-color:var(--brand);box-shadow:0 4px 14px rgba(27,42,74,.25)}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;margin-bottom:16px;box-shadow:var(--shadow-sm);
  transition:box-shadow .25s ease;
}
.card:hover{box-shadow:var(--shadow-md)}
.card h3{font-size:16px;margin-bottom:14px;color:var(--brand);letter-spacing:.02em}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.stat{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;flex:1;min-width:140px;box-shadow:var(--shadow-sm);
}
.stat .num{font-size:28px;font-weight:700;color:var(--brand)}
.stat .lbl{font-size:13px;color:var(--sub);margin-top:4px}
.question{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;margin-bottom:12px;box-shadow:var(--shadow-sm);
}
.question .qtext{font-size:16px;margin-bottom:12px;line-height:1.7}
.question .qtext .blank{display:inline-block;min-width:70px;border-bottom:2px solid var(--gold);margin:0 4px}
.opt{
  display:block;width:100%;text-align:left;padding:13px 16px;margin-bottom:8px;
  border:1px solid var(--line);border-radius:12px;background:#fff;font-size:14px;
  cursor:pointer;transition:.18s;
}
.opt:hover{border-color:var(--brand3);background:#f7f9fe;box-shadow:0 2px 8px rgba(27,42,74,.06)}
.opt.sel{border-color:var(--brand);background:#eef2fa;box-shadow:inset 0 0 0 1px var(--brand)}
.opt.correct{border-color:var(--green);background:#eaf4ec}
.opt.wrong{border-color:var(--red);background:#fdeeee}
.btn{
  display:inline-block;padding:12px 28px;border:none;border-radius:12px;
  font-size:15px;font-weight:600;cursor:pointer;transition:all .2s;
  letter-spacing:.02em;
}
.btn-primary{
  background:linear-gradient(135deg,var(--brand2),var(--brand));color:#fff;
  box-shadow:0 4px 14px rgba(91,61,245,.35);
}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 22px rgba(91,61,245,.45)}
.btn-gold{background:var(--gold-grad);color:#fff;box-shadow:0 4px 14px rgba(184,144,63,.32)}
.btn-gold:hover{transform:translateY(-1px);box-shadow:0 6px 22px rgba(184,144,63,.42)}
.btn-ghost{background:#fff;border:1px solid var(--line);color:var(--sub)}
.btn-ghost:hover{border-color:var(--brand3);color:var(--brand);box-shadow:0 2px 8px rgba(27,42,74,.06)}
.btn-lg{width:100%;padding:15px;font-size:16px}
.btn[disabled]{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}
table{width:100%;border-collapse:collapse;font-size:13px}
th{background:linear-gradient(180deg,#f3efe7,#ece7dc);color:#5c564b;padding:11px 8px;text-align:left;font-weight:600;letter-spacing:.02em}
td{padding:11px 8px;border-bottom:1px solid #efeae0}
tbody tr{transition:background .15s}
tbody tr:hover{background:#faf8f4}
.pill{display:inline-block;padding:3px 10px;border-radius:20px;font-size:12px;background:#f0ede6;color:var(--sub)}
.pill.good{background:#eaf4ec;color:#3a7a3a}
.score-badge{padding:3px 10px;border-radius:20px;font-size:12px;font-weight:600;letter-spacing:.03em}
.score-high{background:#eaf4ec;color:#3a7a3a}
.score-mid{background:#fdf3d8;color:#8a6d1a}
.score-low{background:#fdeeee;color:#a33}
input,select{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:12px;
  font-size:15px;margin-bottom:12px;outline:none;background:#fff;transition:border .2s, box-shadow .2s;
}
input:focus,select:focus{border-color:var(--brand3);box-shadow:0 0 0 3px rgba(42,66,112,.12)}
label{display:block;font-size:13px;color:var(--sub);margin-bottom:4px}
.form-item{margin-bottom:12px}
.msg{background:#eef7ef;border:1px solid #cfe6cf;color:#3a7a3a;padding:12px 16px;border-radius:12px;font-size:14px;margin-bottom:16px}
.msg.err{background:#fdeeee;border-color:#eecfcf;color:#a33}
.empty{text-align:center;color:#b0a89e;padding:30px;font-size:14px}
.score-big{font-size:64px;font-weight:700;color:var(--brand);text-align:center;letter-spacing:.02em;background:var(--gold-grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.mt{margin-top:12px}
/* ── 首页专用高端元素 ── */
.hero{text-align:center;padding:56px 20px 30px;position:relative}
.hero .seal{
  width:76px;height:76px;border-radius:50%;
  background:var(--gold-grad);
  display:flex;align-items:center;justify-content:center;
  font-size:40px;color:#fff;margin:0 auto 22px;
  box-shadow:0 10px 30px rgba(184,144,63,.45), inset 0 2px 0 rgba(255,255,255,.4);
  position:relative;
}
.hero .seal::after{
  content:'';position:absolute;inset:-8px;border-radius:50%;
  border:1px solid rgba(201,164,92,.5);
}
.hero h1{
  font-size:44px;font-weight:700;color:var(--brand);letter-spacing:.06em;
  background:linear-gradient(120deg,var(--brand) 30%,var(--gold-deep) 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
  margin-bottom:10px;
}
.hero .jp{
  font-size:15px;color:var(--gold-deep);letter-spacing:.35em;margin-bottom:14px;font-weight:500;
}
.hero .sub{color:var(--sub);font-size:15px;letter-spacing:.05em}
.portal-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;max-width:960px;margin:36px auto 20px;padding:0 20px}
.portal-card{
  background:var(--card);border:1px solid var(--line);border-radius:18px;
  padding:32px 26px;text-align:center;cursor:pointer;position:relative;overflow:hidden;
  box-shadow:var(--shadow-sm);transition:all .3s ease;text-decoration:none;display:block;
}
.portal-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:4px;
  background:var(--gold-grad);opacity:0;transition:.3s;
}
.portal-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md);border-color:#d8cfbd}
.portal-card:hover::before{opacity:1}
.portal-card .p-icon{
  width:64px;height:64px;border-radius:16px;margin:0 auto 18px;
  display:flex;align-items:center;justify-content:center;font-size:30px;
  box-shadow:var(--shadow-sm);
}
.portal-card .p-title{font-size:19px;font-weight:700;color:var(--brand);margin-bottom:8px;letter-spacing:.03em}
.portal-card .p-desc{font-size:13px;color:var(--sub);line-height:1.6;margin-bottom:18px}
.portal-card .p-go{
  display:inline-block;font-size:13px;font-weight:600;color:var(--gold-deep);
  letter-spacing:.05em;padding:8px 20px;border:1px solid rgba(184,144,63,.5);border-radius:30px;
  transition:.25s;
}
.portal-card:hover .p-go{background:var(--gold-grad);color:#fff;border-color:transparent}
/* 学生-青金 老师-靛蓝 机构-墨绿 三种icon底 */
.p-stu .p-icon{background:linear-gradient(135deg,#3a8fb7,#2b6c94);color:#fff}
.p-tea .p-icon{background:linear-gradient(135deg,var(--brand2),var(--brand));color:#fff}
.p-sch .p-icon{background:linear-gradient(135deg,#4a7a5a,#35603f);color:#fff}
.footer-note{text-align:center;color:#b0a89e;font-size:12px;padding:20px;letter-spacing:.08em}
.hero-ornament{position:absolute;top:30px;left:50%;transform:translateX(-50%);font-size:13px;color:var(--gold);letter-spacing:.5em;opacity:.6}
@media(max-width:700px){
  .view{padding:16px}
  .stat .num{font-size:24px}
  .hero h1{font-size:30px}
  .portal-grid{grid-template-columns:1fr}
  .hero{padding:36px 16px 20px}
}