/* 知识引擎 · 教研课题服务平台 —— 统一视觉系统（无外部依赖）
   墨绿主色 + 暖白底色，层级靠字重/留白/细边框，不靠重色块。 */
:root{
  --brand:#0f5c5e; --brand2:#12787a; --brand3:#0d2b33;
  --accent:#c2703d; --ink:#0f1b2a; --ink2:#233542; --muted:#5b6b78;
  --line:#e2e9e8; --line2:#cdd9d7; --bg:#f5f8f7; --card:#ffffff;
  --ok:#1f8a5b; --warn:#b96a35; --bad:#b3402f;
  --radius:14px; --radius-s:10px;
  --shadow:0 1px 2px rgba(15,43,51,.05), 0 8px 24px -14px rgba(15,43,51,.22);
  --shadow-hover:0 2px 6px rgba(15,43,51,.07), 0 18px 36px -20px rgba(15,43,51,.30);
  --max:1120px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font:15px/1.66 "PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand2);text-decoration:none;transition:color .15s}
a:hover{color:var(--brand);text-decoration:underline}
::selection{background:rgba(18,120,122,.18)}

/* ---------- 页头 ---------- */
header.top{
  position:relative;
  background:
    radial-gradient(900px 300px at 12% -20%, rgba(255,255,255,.10), transparent 60%),
    linear-gradient(118deg,#0b262d 0%,#0e4149 46%,#12787a 100%);
  color:#fff;
  border-bottom:1px solid rgba(255,255,255,.10);
}
.bar{max-width:var(--max);margin:0 auto;padding:15px 20px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;letter-spacing:.3px}
.mark{
  width:31px;height:31px;border-radius:9px;display:grid;place-items:center;font-size:14px;font-weight:700;
  background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.28);
}
nav.links{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap}
nav.links a{color:#d5e8e6;font-size:13.5px;padding:7px 11px;border-radius:8px;transition:background .15s,color .15s}
nav.links a:hover{background:rgba(255,255,255,.12);color:#fff;text-decoration:none}
nav.links a.active{background:rgba(255,255,255,.19);color:#fff}
.pill{font-size:12px;border:1px solid rgba(255,255,255,.34);border-radius:20px;padding:3px 10px;color:#d6ecea;background:rgba(255,255,255,.06)}

/* ---------- 版心 ---------- */
main{max-width:var(--max);margin:0 auto;padding:28px 20px 64px}
h1{font-size:26px;line-height:1.35;margin:0 0 10px;letter-spacing:.2px}
h2{font-size:19px;margin:36px 0 12px;letter-spacing:.2px;display:flex;align-items:center;gap:10px}
h2:before{content:"";width:4px;height:18px;border-radius:2px;background:var(--brand2);flex:none}
h3{font-size:16px;margin:0 0 8px;letter-spacing:.2px}
p.lead{color:var(--muted);margin:0 0 20px;max-width:780px;line-height:1.75}

/* ---------- 卡片 ---------- */
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 22px;box-shadow:var(--shadow);transition:box-shadow .2s,transform .2s,border-color .2s;
}
.card:hover{box-shadow:var(--shadow-hover);border-color:var(--line2)}
.grid{display:grid;gap:18px}
.g2{grid-template-columns:1fr 1fr}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

/* ---------- KPI ---------- */
.kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:22px 0 4px}
.kpi{
  background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.20);
  border-radius:var(--radius-s);padding:13px 15px;color:#fff;
}
.kpi b{display:block;font-size:25px;line-height:1.25;font-variant-numeric:tabular-nums}
.kpi span{font-size:12px;color:#c9e4e0;letter-spacing:.3px}

/* ---------- 表单与按钮 ---------- */
form.row{display:flex;gap:9px;flex-wrap:wrap;margin-top:12px}
input,select,textarea{
  font:inherit;padding:10px 13px;border:1px solid var(--line2);border-radius:var(--radius-s);
  background:#fff;color:var(--ink);min-width:0;transition:border-color .15s,box-shadow .15s;
}
input::placeholder,textarea::placeholder{color:#93a3ac}
input:focus,select:focus,textarea:focus{outline:0;border-color:var(--brand2);box-shadow:0 0 0 3px rgba(18,120,122,.14)}
.grow{flex:1 1 200px}
button{
  font:inherit;font-weight:600;cursor:pointer;border:0;border-radius:var(--radius-s);
  padding:10px 18px;color:#fff;
  background:linear-gradient(180deg,var(--brand2),var(--brand));
  box-shadow:0 2px 6px -2px rgba(15,92,94,.55);
  transition:transform .12s,box-shadow .18s,filter .18s;
}
button:hover{filter:brightness(1.06);box-shadow:0 6px 16px -8px rgba(15,92,94,.7);transform:translateY(-1px)}
button:active{transform:translateY(0);filter:brightness(.97)}
button.ghost{background:#fff;color:var(--brand);border:1px solid var(--line2);box-shadow:none;font-weight:500}
button.ghost:hover{background:#f3f8f7;border-color:var(--brand2);transform:none;filter:none}
button.danger{background:linear-gradient(180deg,#c14a37,#a53526)}
button:disabled{opacity:.55;cursor:not-allowed;transform:none;filter:none}
button:focus-visible,a:focus-visible{outline:2px solid rgba(18,120,122,.45);outline-offset:2px}

/* ---------- 表格 ---------- */
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{padding:11px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}
th{background:#f1f6f5;color:#1f3a45;font-weight:600;font-size:12.5px;letter-spacing:.4px;border-bottom:1px solid var(--line2)}
tbody tr:nth-child(even) td{background:#fbfcfc}
tr:hover td{background:#f5fafa}
td:first-child{font-weight:500;color:var(--ink2)}

/* ---------- 标签 ---------- */
.tag{
  display:inline-block;font-size:12px;padding:2px 9px;border-radius:20px;
  background:#eef5f4;color:var(--brand);margin:0 6px 6px 0;border:1px solid #e0ecea;
}
.tag.warn{background:#fbf1e9;color:var(--warn);border-color:#f2e2d4}
.tag.bad{background:#fbecea;color:var(--bad);border-color:#f3dcd8}
.tag.ok{background:#eaf6f0;color:var(--ok);border-color:#d9eee2}

/* ---------- 杂项 ---------- */
.muted{color:var(--muted);font-size:13px}
.empty{padding:30px;text-align:center;color:var(--muted);font-size:13.5px}
.list-item{padding:15px 0;border-bottom:1px solid var(--line)}
.list-item:last-child{border-bottom:0}
.list-item h4{margin:0 0 4px;font-size:15px;letter-spacing:.2px}
.banner{
  border-left:4px solid var(--accent);background:#fdf7f2;padding:13px 17px;
  border-radius:var(--radius-s);color:#6b4530;font-size:13.5px;line-height:1.75;
}
.err{color:var(--bad);font-size:13px;min-height:18px;margin-top:6px}
.stat-line{display:flex;gap:20px;flex-wrap:wrap;margin:8px 0 0;font-size:13px;color:var(--muted)}

/* ---------- 页脚 ---------- */
footer{border-top:1px solid var(--line);background:#fff;color:var(--muted);font-size:12.5px}
footer .in{max-width:var(--max);margin:0 auto;padding:20px}

/* ---------- Toast ---------- */
.toast{
  position:fixed;right:18px;bottom:18px;z-index:99;max-width:min(420px,86vw);
  background:var(--brand3);color:#fff;padding:11px 17px;border-radius:11px;font-size:13.5px;
  opacity:0;transform:translateY(6px);transition:opacity .25s,transform .25s;pointer-events:none;
  box-shadow:0 12px 30px -12px rgba(0,0,0,.5);
}
.toast.show{opacity:1;transform:translateY(0)}

/* ---------- 响应式 ---------- */
@media(max-width:900px){
  .g2,.g3,.g4{grid-template-columns:1fr}
  .kpis{grid-template-columns:repeat(2,1fr)}
  main{padding:22px 16px 56px}
  h1{font-size:23px}
}
@media(max-width:640px){
  .bar{padding:12px 16px;gap:10px}
  .brand{font-size:15.5px}
  .mark{width:27px;height:27px;font-size:12.5px}
  nav.links{margin-left:0;width:100%;overflow-x:auto;flex-wrap:nowrap;padding-bottom:2px;gap:2px}
  nav.links a{white-space:nowrap}
  main{padding:18px 14px 48px}
  h1{font-size:20px}
  h2{font-size:17px;margin-top:28px}
  .card{padding:16px;border-radius:12px}
  .kpis{gap:10px}
  .kpi{padding:11px 12px}
  .kpi b{font-size:20px}
  input,select,textarea{padding:9px 11px;font-size:16px}
  button{padding:10px 15px}
  table{display:block;overflow-x:auto;white-space:nowrap;-webkit-overflow-scrolling:touch}
}
@media(prefers-reduced-motion:reduce){
  *{transition:none!important}
}