:root{
  --brand:#2f6df6; --brand-d:#1f54d0; --bg:#f4f6fb; --card:#fff;
  --text:#1f2433; --muted:#7b8499; --line:#e6e9f2; --ok:#1aa97a;
  --warn:#f5a623; --bad:#e8504e; --radius:16px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",
    "Helvetica Neue",Arial,sans-serif;
  background:var(--bg); color:var(--text); line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:760px; margin:0 auto; padding:16px 14px 48px}
header.top{
  background:linear-gradient(135deg,var(--brand),#5b8bff); color:#fff;
  border-radius:var(--radius); padding:20px 18px; margin-bottom:16px;
  box-shadow:0 8px 24px rgba(47,109,246,.25);
}
header.top h1{margin:0; font-size:20px; letter-spacing:.5px}
header.top p{margin:6px 0 0; font-size:13px; opacity:.92}
.card{background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:16px; margin-bottom:14px; box-shadow:0 2px 10px rgba(20,40,90,.04)}
.card h2{margin:0 0 12px; font-size:16px}
label{display:block; font-size:13px; color:var(--muted); margin:10px 0 6px}
input,select{width:100%; padding:12px 12px; font-size:16px; border:1px solid var(--line);
  border-radius:12px; background:#fff; color:var(--text); outline:none}
input:focus,select:focus{border-color:var(--brand); box-shadow:0 0 0 3px rgba(47,109,246,.12)}
.row{display:flex; gap:10px}
.row > div{flex:1}
.btn{display:block; width:100%; padding:14px; font-size:16px; font-weight:600;
  color:#fff; background:var(--brand); border:none; border-radius:12px; cursor:pointer;
  transition:background .15s,transform .05s}
.btn:active{transform:scale(.99)}
.btn:disabled{background:#c3ccdb; cursor:not-allowed}
.btn.ghost{background:#eef2fb; color:var(--brand)}
.btn.danger{background:#e74c3c; color:#fff}
.btn.danger:hover{background:#c0392b}
.hint{font-size:12px; color:var(--muted); margin-top:8px}

/* 年级段快捷选择 */
.grade-grid{display:grid; grid-template-columns:repeat(4,1fr); gap:8px; margin-top:4px}
.grade-grid button{padding:12px 0; font-size:15px; border:1px solid var(--line);
  background:#fff; border-radius:12px; cursor:pointer; color:var(--text)}
.grade-grid button.on{background:var(--brand); color:#fff; border-color:var(--brand)}

/* 社团卡片 */
.clubs{display:grid; grid-template-columns:1fr; gap:12px}
@media(min-width:560px){ .clubs{grid-template-columns:1fr 1fr} }
.club{border:1px solid var(--line); border-radius:14px; padding:14px; background:#fff;
  position:relative; transition:border-color .15s, box-shadow .15s}
.club.sel{border-color:var(--brand); box-shadow:0 0 0 3px rgba(47,109,246,.14)}
.club .cat{font-size:11px; color:#fff; background:#9aa7c7; padding:2px 8px;
  border-radius:999px; display:inline-block; margin-bottom:6px}
.club h3{margin:2px 0 4px; font-size:16px}
.club .meta{font-size:12px; color:var(--muted); margin-bottom:8px}
.club .quota{display:flex; align-items:center; gap:8px; font-size:14px}
.badge{padding:3px 9px; border-radius:999px; font-size:12px; font-weight:600}
.badge.ok{background:#e6f7f0; color:var(--ok)}
.badge.low{background:#fff3e0; color:var(--warn)}
.badge.bad{background:#fdeaea; color:var(--bad)}
.club.disabled{opacity:.62; background:#fafbfd}
.club .pick{margin-top:10px; width:100%; padding:10px; border:none; border-radius:10px;
  background:var(--brand); color:#fff; font-size:14px; cursor:pointer}
.club.disabled .pick{background:#c3ccdb; cursor:not-allowed}
.cat-tag-慧创{background:#e3eefc;color:#2f6df6}
.cat-tag-慧健{background:#e6f7f0;color:#1aa97a}
.cat-tag-慧美{background:#fdeaf3;color:#d6478f}
.cat-tag-慧雅{background:#eef0fb;color:#6a5ae0}
.cat-tag-慧合{background:#fdf2e3;color:#c9802a}
.cat-tag-慧正{background:#e9f6fd;color:#2a8fc9}

/* 结果提示 */
.toast{position:fixed; left:50%; top:18%; transform:translateX(-50%);
  background:rgba(31,36,51,.94); color:#fff; padding:12px 18px; border-radius:12px;
  font-size:14px; z-index:50; max-width:86%; text-align:center; opacity:0;
  transition:opacity .2s}
.toast.show{opacity:1}
.toast.ok{background:rgba(26,169,122,.96)}
.toast.bad{background:rgba(232,80,78,.96)}

.success{text-align:center; padding:30px 10px}
.success .ring{width:72px; height:72px; border-radius:50%; background:var(--ok);
  color:#fff; font-size:38px; line-height:72px; margin:0 auto 14px}
.success h2{margin:0 0 6px}
.success .detail{font-size:14px; color:var(--muted)}
.success .detail b{color:var(--text)}
.nav-admin{text-align:center; margin-top:22px; font-size:12px; color:var(--muted)}
.nav-admin a{color:var(--brand); text-decoration:none}