/* ===== Bearing Calculator — shared stylesheet (offline, no external deps) ===== */
:root{
  --bg:#f4f6f9;
  --panel:#ffffff;
  --ink:#1f2733;
  --muted:#5b6675;
  --line:#e2e8f0;
  --brand:#0b5cab;
  --brand-d:#08487f;
  --accent:#e8730c;
  --ok:#1b8a4b;
  --bad:#c0392b;
  --warn:#b8860b;
  --chip:#eef3fa;
  --shadow:0 1px 3px rgba(16,32,64,.08),0 6px 18px rgba(16,32,64,.06);
  --radius:10px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.55;font-size:15px;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}

/* ---- Top bar ---- */
.topbar{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  background:linear-gradient(180deg,#0e63b8,#0b4f93);
  color:#fff;padding:10px 18px;position:sticky;top:0;z-index:50;
  box-shadow:0 2px 8px rgba(0,0,0,.18);
}
.topbar .brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;letter-spacing:.3px}
.topbar .brand .logo{
  width:30px;height:30px;border-radius:7px;background:#fff;color:var(--brand);
  display:grid;place-items:center;font-weight:800;font-size:15px;
}
.topbar .brand small{font-weight:400;opacity:.85;font-size:12px;display:block}
.topbar .spacer{flex:1}
.topbar .lang select{
  background:#fff;color:var(--ink);border:1px solid #cdd9e6;border-radius:7px;
  padding:6px 8px;font-size:13px;cursor:pointer;
}
.btn-link{
  display:inline-flex;align-items:center;gap:6px;background:#ffffff;color:var(--brand-d);
  border:none;border-radius:7px;padding:7px 12px;font-size:13px;font-weight:600;cursor:pointer;
  text-decoration:none;box-shadow:0 1px 2px rgba(0,0,0,.15);
}
.btn-link:hover{background:#eaf2fb;text-decoration:none}
.btn-link.alt{background:var(--accent);color:#fff}
.btn-link.alt:hover{background:#cf650a}

/* ---- Nav ---- */
.navbar{
  background:var(--panel);border-bottom:1px solid var(--line);position:sticky;top:52px;z-index:40;
  display:flex;gap:2px;overflow-x:auto;padding:0 12px;
}
.navbar a{
  padding:11px 14px;color:var(--muted);font-size:14px;font-weight:600;white-space:nowrap;
  border-bottom:3px solid transparent;
}
.navbar a:hover{color:var(--brand);text-decoration:none;background:var(--chip)}
.navbar a.active{color:var(--brand-d);border-bottom-color:var(--brand)}

/* ---- Layout ---- */
.wrap{max-width:1080px;margin:22px auto;padding:0 16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:22px;margin-bottom:18px}
.card h1{margin:0 0 4px;font-size:23px}
.card h2{font-size:18px;margin:20px 0 10px;border-left:4px solid var(--brand);padding-left:10px}
.card h3{font-size:15px;margin:14px 0 6px;color:var(--brand-d)}
.lead{color:var(--muted);margin:0 0 14px;font-size:14px}
.sub{color:var(--muted);font-size:13px}

/* ---- Forms ---- */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.grid3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px}
.field{display:flex;flex-direction:column;gap:5px;margin-bottom:12px}
.field label{font-size:13px;font-weight:600;color:var(--ink)}
.field .hint{font-size:11.5px;color:var(--muted)}
.field input,.field select{
  padding:9px 10px;border:1px solid #cdd9e6;border-radius:8px;font-size:14px;background:#fff;color:var(--ink);
}
.field input:focus,.field select:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(11,92,171,.15)}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:flex-end}
.actions{display:flex;gap:10px;margin:10px 0 4px}
.btn{
  background:var(--brand);color:#fff;border:none;border-radius:8px;padding:10px 18px;font-size:14px;
  font-weight:600;cursor:pointer;
}
.btn:hover{background:var(--brand-d)}
.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.btn.ghost:hover{background:var(--chip)}

/* ---- Results ---- */
.result{margin-top:14px;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.result .head{background:var(--chip);padding:10px 14px;font-weight:700;display:flex;justify-content:space-between;align-items:center}
.result table{width:100%;border-collapse:collapse}
.result td,.result th{padding:9px 14px;border-bottom:1px solid var(--line);text-align:left;font-size:14px}
.result tr:last-child td{border-bottom:none}
.result td.k{color:var(--muted);width:55%}
.result td.v{font-weight:700;text-align:right;font-variant-numeric:tabular-nums}
.verdict{display:inline-block;padding:4px 12px;border-radius:20px;font-weight:700;font-size:13px}
.verdict.ok{background:#e4f6ec;color:var(--ok)}
.verdict.bad{background:#fbe7e4;color:var(--bad)}
.verdict.warn{background:#fbf2da;color:var(--warn)}

/* ---- Tables (reference) ---- */
table.data{width:100%;border-collapse:collapse;margin:8px 0;font-size:13.5px}
table.data th,table.data td{border:1px solid var(--line);padding:7px 9px;text-align:center}
table.data th{background:var(--chip);font-weight:700}
table.data td.l,table.data th.l{text-align:left}
.tag{display:inline-block;background:var(--chip);border:1px solid var(--line);border-radius:6px;
  padding:2px 8px;font-size:12px;margin:2px;color:var(--brand-d)}

/* ---- Home cards ---- */
.toolgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(232px,1fr));gap:16px}
.toolcard{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px;
  box-shadow:var(--shadow);transition:.15s;display:flex;flex-direction:column;gap:8px}
.toolcard:hover{transform:translateY(-3px);border-color:var(--brand)}
.toolcard .ic{width:40px;height:40px;border-radius:9px;background:var(--chip);color:var(--brand);
  display:grid;place-items:center;font-size:20px;font-weight:800}
.toolcard h3{margin:2px 0;font-size:16px}
.toolcard p{margin:0;color:var(--muted);font-size:13px}

/* ---- Standards badge ---- */
.stdbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;background:var(--chip);
  border:1px solid var(--line);border-radius:9px;padding:10px 14px;margin-bottom:16px}
.stdbar .lbl{font-weight:700;color:var(--brand-d);font-size:13px}
.stdbar .tag{background:#fff}

/* ---- Formula block ---- */
.formula{background:#0e1726;color:#e8eef7;border-radius:9px;padding:12px 14px;font-family:"Consolas",ui-monospace,monospace;
  font-size:13.5px;overflow-x:auto;margin:10px 0}
.formula b{color:#ffcf8a}

/* ---- Footer ---- */
.footer{margin-top:24px;border-top:1px solid var(--line);padding:18px 16px;color:var(--muted);font-size:12.5px;text-align:center}
.footer a{margin:0 6px}

@media (max-width:720px){
  .grid2,.grid3{grid-template-columns:1fr}
  .topbar .brand small{display:none}
}