:root{
  --bg:#0f172a; --bg2:#1e293b; --card:#1e293b; --card2:#273449;
  --line:#334155; --txt:#e2e8f0; --muted:#94a3b8;
  --acc:#f59e0b; --acc2:#fbbf24; --green:#22c55e; --red:#ef4444;
  --blue:#3b82f6; --shadow:0 10px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Segoe UI',system-ui,-apple-system,'Noto Sans CJK SC','Microsoft YaHei',sans-serif;background:linear-gradient(160deg,#0b1120,#0f172a 60%,#111c33);color:var(--txt);min-height:100vh;line-height:1.5}
a{color:var(--acc2);text-decoration:none}
header{position:sticky;top:0;z-index:50;background:rgba(15,23,42,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.topbar{max-width:1280px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;margin-right:auto}
.logo{width:38px;height:38px;border-radius:9px;background:linear-gradient(135deg,var(--acc),#ef4444);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;color:#fff;box-shadow:0 4px 12px rgba(245,158,11,.35)}
.brand h1{font-size:18px;font-weight:700;letter-spacing:.3px}
.brand small{display:block;color:var(--muted);font-size:11px;font-weight:400}
.topbtns{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border-radius:8px;border:1px solid var(--line);background:var(--card2);color:var(--txt);font-size:13px;font-weight:600;cursor:pointer;transition:.15s}
.btn:hover{background:#334155;border-color:var(--acc)}
.btn.acc{background:linear-gradient(135deg,var(--acc),#d97706);border:none;color:#fff}
.btn.acc:hover{filter:brightness(1.08)}
.btn.unit{background:var(--bg2);padding:8px 10px;color:var(--muted);border:1px solid var(--line);font-size:12px}
.btn.unit.on{background:linear-gradient(135deg,var(--blue),#2563eb);color:#fff;border-color:transparent}
select.lang{background:var(--card2);color:var(--txt);border:1px solid var(--line);border-radius:8px;padding:8px 10px;font-size:13px;cursor:pointer}
.wrap{max-width:1280px;margin:0 auto;padding:20px 16px 60px}
.hero{text-align:center;padding:14px 0 22px}
.hero h2{font-size:26px;font-weight:800;background:linear-gradient(90deg,var(--acc2),#fff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--muted);max-width:860px;margin:8px auto 0;font-size:14px}
.modnav{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin:18px 0 26px}
.modnav button{padding:9px 14px;border-radius:9px;border:1px solid var(--line);background:var(--card);color:var(--muted);font-size:13px;font-weight:600;cursor:pointer;transition:.15s}
.modnav button:hover{color:var(--txt);border-color:var(--acc)}
.modnav button.active{background:linear-gradient(135deg,var(--acc),#d97706);color:#fff;border-color:transparent;box-shadow:0 4px 14px rgba(245,158,11,.3)}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:900px){.grid{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px;box-shadow:var(--shadow)}
.card h3{font-size:16px;font-weight:700;margin-bottom:4px;display:flex;align-items:center;gap:8px}
.card .sub{color:var(--muted);font-size:12px;margin-bottom:14px}
.field{margin-bottom:12px}
.field label{display:block;font-size:12px;color:var(--muted);margin-bottom:4px;font-weight:600}
.field .row{display:flex;gap:8px;align-items:center}
.field input,.field select{width:100%;padding:9px 11px;border-radius:8px;border:1px solid var(--line);background:var(--bg2);color:var(--txt);font-size:14px}
.field input:focus,.field select:focus{outline:none;border-color:var(--acc)}
.field .unit{font-size:11px;color:var(--muted);white-space:nowrap;min-width:48px}
.frow{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.actions{display:flex;gap:10px;margin-top:6px}
.btn.calc{background:linear-gradient(135deg,var(--green),#16a34a);border:none;color:#fff;flex:1;justify-content:center;padding:11px;font-size:14px}
.btn.reset{background:var(--card2);border:1px solid var(--line);padding:11px}
.results{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px;box-shadow:var(--shadow)}
.results h3{font-size:16px;font-weight:700;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.rgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}
.rbox{background:var(--bg2);border:1px solid var(--line);border-radius:10px;padding:12px}
.rbox .k{font-size:11px;color:var(--muted);margin-bottom:4px}
.rbox .v{font-size:17px;font-weight:700;color:var(--acc2)}
.rbox .v small{font-size:11px;color:var(--muted);font-weight:400}
.chart{margin-top:14px;background:var(--bg2);border:1px solid var(--line);border-radius:10px;padding:10px}
.chart .ct{font-size:12px;font-weight:700;color:var(--acc2);margin-bottom:6px}
.chart canvas{width:100%;height:250px;display:block}
.tcbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:8px}
.tcbar .btn{padding:4px 12px;font-size:12px}
.tchint{font-size:11px;color:var(--muted);flex:1;min-width:140px}
.ovsec{font-size:12px;font-weight:700;color:var(--acc);margin:14px 0 8px;letter-spacing:.5px;border-bottom:1px dashed var(--line);padding-bottom:4px}
.legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:8px;font-size:11px;color:var(--muted)}
.legend span{display:inline-flex;align-items:center;gap:6px}
.legend i{width:16px;height:3px;border-radius:2px;display:inline-block;flex:none}
.legend i.dash{height:0;border-top:2px dashed;background:none}
.legend i.dot{width:9px;height:9px;border-radius:50%}
.note{margin-top:14px;font-size:12px;color:var(--muted);border-top:1px dashed var(--line);padding-top:10px}
.note b{color:var(--acc2)}
.modal-box{background:var(--bg);border:1px solid var(--line);border-radius:14px;padding:20px;max-width:520px;width:100%;max-height:90vh;overflow:auto;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.modal-box.wide{max-width:760px}
.modal-box h3{color:var(--acc2);margin:0 0 8px}
.modal-box h4{color:var(--acc);margin:0 0 6px}
.cmp-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:10px}
.txt{width:100%;box-sizing:border-box;background:var(--bg2);color:var(--txt);border:1px solid var(--line);border-radius:8px;padding:10px;font-family:monospace;font-size:12px;margin-top:8px}
.cls{border-left:3px solid var(--acc);padding-left:10px;margin:10px 0;font-size:14px;color:var(--txt)}
.cls strong{color:var(--acc2)}
.conv{display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:end}
.conv .eq{font-size:22px;color:var(--acc2);text-align:center;padding-bottom:10px}
.conv select{width:100%;margin-top:4px}
footer{border-top:1px solid var(--line);margin-top:30px;padding:18px 16px;text-align:center;color:var(--muted);font-size:12px}
footer a{color:var(--acc2)}