:root{
  --bg:#f4f6f9; --panel:#ffffff; --ink:#1f2937; --muted:#67748a;
  --line:#e2e8f0; --brand:#0b5fa5; --brand2:#0d8a6e; --accent:#e8f0fb;
  --warn:#b45309; --shadow:0 1px 3px rgba(15,23,42,.08);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:"Segoe UI",system-ui,"Microsoft YaHei","Noto Sans CJK",sans-serif;
  background:var(--bg);color:var(--ink);font-size:14px;line-height:1.5}

/* header */
#site-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;
  background:linear-gradient(90deg,var(--brand),var(--brand2));color:#fff;padding:10px 18px;position:sticky;top:0;z-index:20}
#site-header .brand a{color:#fff;text-decoration:none;font-weight:700;font-size:16px}
#site-header .brand .tag{display:block;font-size:11px;opacity:.85;font-weight:400}
.hdr-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.hdr-actions .btn{background:rgba(255,255,255,.15);color:#fff;text-decoration:none;padding:6px 12px;border-radius:6px;font-size:13px;border:1px solid rgba(255,255,255,.3)}
.hdr-actions .btn:hover{background:rgba(255,255,255,.28)}
.hdr-actions .lang{display:flex;align-items:center;gap:5px;font-size:12px}
.hdr-actions select{font-size:13px;padding:5px 6px;border-radius:6px;border:1px solid rgba(255,255,255,.4);background:#fff;color:var(--ink)}

/* layout */
.layout{display:grid;grid-template-columns:240px 1fr;gap:0;align-items:start}
.sidebar{position:sticky;top:58px;height:calc(100vh - 58px);overflow:auto;background:var(--panel);border-right:1px solid var(--line);padding:10px}
.content{padding:18px 22px 40px;min-width:0}

/* nav */
.nav-cat{font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:14px 6px 4px}
.nav-item{display:block;width:100%;text-align:left;background:none;border:none;cursor:pointer;
  padding:7px 9px;border-radius:6px;color:var(--ink);font-size:13px}
.nav-item:hover{background:var(--accent)}
.nav-item.active{background:var(--brand);color:#fff;font-weight:600}

/* cards & forms */
.card{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px 18px;margin-bottom:16px;box-shadow:var(--shadow)}
.card h2{margin:0 0 10px;font-size:16px;color:var(--brand)}
.module{scroll-margin-top:64px}
.module > h1{font-size:20px;margin:0 0 4px}
.intro{color:var(--muted);margin:0 0 14px}
.form-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}
.form-row{display:flex;flex-direction:column;gap:4px}
.form-row label{font-size:12px;color:var(--muted)}
.form-row input,.form-row select{padding:8px 9px;border:1px solid var(--line);border-radius:7px;font-size:14px;background:#fff;color:var(--ink)}
.form-row input:focus,.form-row select:focus{outline:2px solid var(--accent);border-color:var(--brand)}
.btn-row{margin-top:14px;display:flex;gap:10px;flex-wrap:wrap}
.btn-calc{background:var(--brand);color:#fff;border:none;padding:9px 18px;border-radius:7px;cursor:pointer;font-size:14px}
.btn-calc:hover{filter:brightness(1.06)}
.btn-reset{background:#eef2f7;color:var(--ink);border:1px solid var(--line);padding:9px 16px;border-radius:7px;cursor:pointer;font-size:14px}

/* result */
.result{margin-top:16px}
table{border-collapse:collapse;width:100%;font-size:13px}
th,td{border:1px solid var(--line);padding:7px 9px;text-align:left}
th{background:#eef3f9;color:var(--ink);font-weight:600}
tbody tr:nth-child(even){background:#fafcff}
.num{text-align:right;font-variant-numeric:tabular-nums}
.note{background:#fff7ed;border:1px solid #fed7aa;color:#7c3a06;padding:10px 12px;border-radius:8px;font-size:13px;margin-top:12px}
.note b{color:var(--warn)}
.highlight{background:var(--accent);font-weight:600}

/* tables module */
.search-row{margin-bottom:12px;display:flex;gap:8px}
.search-row input{padding:8px 10px;border:1px solid var(--line);border-radius:7px;flex:1;max-width:360px}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:8px}

footer#site-footer{background:#0f172a;color:#cbd5e1;padding:16px 22px;font-size:12px;margin-top:20px}
footer#site-footer .disc{margin:0 0 6px}
footer#site-footer .src{margin:0 0 6px;opacity:.8}
footer#site-footer a{color:#7dd3fc;text-decoration:none}
footer#site-footer a:hover{text-decoration:underline}

@media (max-width:820px){
  .layout{grid-template-columns:1fr}
  .sidebar{position:static;height:auto;border-right:none;border-bottom:1px solid var(--line)}
  .nav-cat{margin-top:8px}
}

/* export button + print + sortable header (P1) */
.card.module{position:relative}
.exp-btn{position:absolute;top:12px;right:14px;background:var(--accent);color:var(--brand);
  border:1px solid var(--line);border-radius:6px;padding:5px 10px;font-size:12px;cursor:pointer}
.exp-btn:hover{background:var(--brand);color:#fff}
.float-print{position:fixed;right:18px;bottom:18px;z-index:30;width:46px;height:46px;border-radius:50%;
  border:none;background:var(--brand);color:#fff;font-size:20px;cursor:pointer;box-shadow:var(--shadow)}
.float-print:hover{background:var(--brand2)}
.table-wrap th{position:relative;cursor:pointer;user-select:none;white-space:nowrap}
.table-wrap th:hover{background:var(--accent)}
.table-wrap th[data-sort="asc"]::after{content:" \25B2";font-size:10px;color:var(--brand)}
.table-wrap th[data-sort="desc"]::after{content:" \25BC";font-size:10px;color:var(--brand)}
.float-tools{position:fixed;right:18px;bottom:18px;z-index:30;display:flex;flex-direction:column;gap:8px}
.ft-btn{width:44px;height:44px;border-radius:50%;border:none;background:var(--brand);color:#fff;font-size:19px;
  cursor:pointer;box-shadow:var(--shadow);line-height:1}
.ft-btn:hover{background:var(--brand2)}
.float-tools .float-print{position:static;right:auto;bottom:auto;box-shadow:none;width:44px;height:44px;font-size:19px}
.muted{color:var(--muted)}
.del{background:none;border:none;color:var(--warn);cursor:pointer;font-size:11px;padding:0 2px}
@media print{
  #site-header,#site-footer,#nav,.float-tools,.exp-btn,.btn-row{display:none !important}
  .layout{display:block}
  .content{padding:0}
  .card{box-shadow:none;border:none;page-break-inside:avoid}
}