:root{
  --blue:#1f3864;
  --blue2:#2e5596;
  --accent:#d97706;
  --bg:#eef1f6;
  --card:#ffffff;
  --text:#1c2733;
  --muted:#5b6b7c;
  --line:#d7dee9;
  --ok:#1d7a3f;
  --warn:#b45309;
  --inp:#ffffff;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:"Segoe UI","Microsoft YaHei","PingFang SC","Noto Sans JP","Malgun Gothic",system-ui,-apple-system,sans-serif;
  background:var(--bg);color:var(--text);font-size:15px;line-height:1.55;
}
a{color:var(--blue2)}
/* ---------- top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  background:linear-gradient(90deg,var(--blue),var(--blue2));color:#fff;
  padding:10px 16px;box-shadow:0 2px 8px rgba(0,0,0,.18);
}
.topbar .brand{font-weight:700;font-size:17px;letter-spacing:.3px;display:flex;align-items:center;gap:9px}
.topbar .brand .logo{font-size:22px}
.topbar .spacer{flex:1}
.topbar button.topbtn{
  border:1px solid rgba(255,255,255,.6);background:rgba(255,255,255,.16);color:#fff;
  border-radius:6px;padding:10px 18px;font-size:14px;font-weight:600;cursor:pointer;transition:.2s;
  white-space:nowrap;box-shadow:0 1px 3px rgba(0,0,0,.15);
}
.topbar button.topbtn:hover{background:rgba(255,255,255,.32)}
.topbar .mail-btn{background:rgba(217,119,6,.75);border-color:rgba(255,255,255,.5)}
/* language selector */
.topbar select{background:#fff;color:var(--text);border:none;border-radius:5px;padding:6px 6px;font-size:13px;cursor:pointer}
/* ---------- nav bar ---------- */
.navbar{
  background:#0f2746;display:flex;flex-wrap:wrap;gap:2px;padding:0 16px;
}
.navbar a{
  color:#dbe6f5;text-decoration:none;padding:11px 14px;font-size:14px;border-bottom:3px solid transparent;
}
.navbar a:hover{background:rgba(255,255,255,.08)}
.navbar a.active{color:#fff;border-bottom-color:var(--accent);background:rgba(255,255,255,.12)}
/* ---------- layout ---------- */
.wrap{max-width:1180px;margin:0 auto;padding:20px 16px 60px}
.page-title{font-size:22px;margin:6px 0 2px}
.page-sub{color:var(--muted);margin:0 0 18px;font-size:13.5px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px;text-decoration:none;color:var(--text);
  box-shadow:0 1px 3px rgba(16,32,54,.08);transition:.18s;
}
.card:hover{transform:translateY(-3px);box-shadow:0 6px 16px rgba(16,32,54,.15);border-color:var(--blue2)}
.card .ico{font-size:26px}
.card h3{margin:8px 0 4px;font-size:16px}
.card p{margin:0;color:var(--muted);font-size:12.5px}
/* ---------- calculators ---------- */
.calc{
  background:var(--card);border:1px solid var(--line);border-radius:10px;margin-bottom:22px;overflow:hidden;
  box-shadow:0 1px 3px rgba(16,32,54,.08);
}
.calc>header{
  background:#f4f7fc;border-bottom:1px solid var(--line);padding:12px 16px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;
}
.calc>header h2{margin:0;font-size:16px;color:var(--blue)}
.calc>header .tag{margin-left:auto;color:var(--muted);font-size:12px}
.calc .body{padding:16px}
.formula-note{
  background:#fbf6ec;border:1px solid #eedcba;border-left:4px solid var(--accent);
  border-radius:6px;padding:10px 12px;color:#7a4d00;font-size:12.5px;margin-bottom:14px;
}
.fieldgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.field label{display:block;font-size:12.5px;color:var(--muted);margin-bottom:4px;font-weight:600}
.field .inrow{display:flex;align-items:center;gap:6px}
.field input[type=number]{
  width:100%;padding:8px 9px;border:1px solid var(--line);border-radius:6px;background:var(--inp);
  font-size:14px;color:var(--text);
}
.field input[type=number]:focus{outline:none;border-color:var(--blue2);box-shadow:0 0 0 2px rgba(46,85,150,.15)}
.field .unit{color:var(--muted);font-size:12px;white-space:nowrap}
.results{margin-top:16px;border-top:1px dashed var(--line);padding-top:12px}
.results h4{margin:0 0 10px;font-size:14px;color:var(--blue)}
.result-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px}
.result-item{background:#f6f9ff;border:1px solid var(--line);border-radius:8px;padding:10px 12px}
.result-item .rl{font-size:12px;color:var(--muted)}
.result-item .rv{font-size:18px;font-weight:700;color:var(--blue)}
.result-item .rv .ru{font-size:12px;font-weight:400;color:var(--muted);margin-left:4px}
.result-item.hl{background:#fdf4e7;border-color:#eedcba}
.result-item.hl .rv{color:var(--warn)}
.result-item.ok{background:#eefaf1;border-color:#bfe6cd}
.result-item.ok .rv{color:var(--ok)}
.actions{margin-top:14px;display:flex;gap:10px;flex-wrap:wrap}
.actions button{border:none;border-radius:6px;padding:9px 18px;font-size:14px;cursor:pointer}
.actions .calc-btn{background:var(--blue2);color:#fff}
.actions .calc-btn:hover{background:var(--blue)}
.actions .reset-btn{background:#e6ebf3;color:var(--text)}
/* query table */
.qtoolbar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:12px}
.qtoolbar input,.qtoolbar select{padding:7px 9px;border:1px solid var(--line);border-radius:6px;font-size:13px}
.qtoolbar input{flex:1;min-width:160px}
.table-wrap{overflow:auto;max-height:560px;border:1px solid var(--line);border-radius:8px}
table.data{width:100%;border-collapse:collapse;font-size:12.5px;white-space:nowrap}
table.data th,table.data td{border-bottom:1px solid var(--line);padding:7px 10px;text-align:left}
table.data thead th{background:#eef2f9;position:sticky;top:0;color:var(--blue);font-weight:600}
table.data tr:hover td{background:#f6f9ff}
/* misc */
.w86{max-width:86ch}
.home-hero{
  text-align:center;padding:46px 16px 44px;border-radius:14px;color:#fff;
  background:linear-gradient(135deg,var(--blue) 0%,var(--blue2) 58%,#3a6ab8 100%);
  box-shadow:0 6px 18px rgba(16,32,54,.18);margin-bottom:28px;
}
.home-hero .hero-ico{font-size:54px;line-height:1;filter:drop-shadow(0 3px 6px rgba(0,0,0,.25))}
.home-hero h1{font-size:32px;margin:14px 0 8px;color:#fff;letter-spacing:.5px}
.home-hero p{color:rgba(255,255,255,.9);max-width:780px;margin:0 auto;font-size:14.5px}
/* home feature cards */
.home-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.hcard{
  background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px;text-decoration:none;
  color:var(--text);display:block;transition:.18s;box-shadow:0 1px 3px rgba(16,32,54,.08);
}
.hcard:hover{transform:translateY(-4px);box-shadow:0 8px 20px rgba(16,32,54,.16);border-color:var(--blue2)}
.hcard .hic{width:52px;height:52px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#eef3fc,#deebf9);margin-bottom:14px}
.hcard .hico{font-size:26px;line-height:1}
.hcard h3{margin:0 0 6px;font-size:17px;color:var(--blue)}
.hcard p{margin:0;color:var(--muted);font-size:13px;line-height:1.5}
@media(max-width:900px){.home-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.home-grid{grid-template-columns:1fr}.home-hero h1{font-size:26px}}
.sect-title{font-size:15px;color:var(--blue);margin:26px 0 10px;font-weight:700;border-left:4px solid var(--accent);padding-left:10px}
.note{background:#f2f5fa;border-left:4px solid var(--blue2);border-radius:6px;padding:10px 12px;color:var(--muted);font-size:12.5px;margin:12px 0}
.grid-eq{display:grid;gap:10px;margin-bottom:14px}
.eqrow{display:flex;gap:12px;align-items:baseline;flex-wrap:wrap}
.eqrow .kh{min-width:170px;font-weight:600;color:var(--blue2);font-size:13.5px}
footer{color:var(--muted);text-align:center;font-size:12.5px;padding:20px}
@media(max-width:640px){.topbar{gap:6px}.navbar a{padding:9px 10px}.page-title{font-size:19px}}