:root{--ink:#0f2943;--muted:#65758a;--line:#dbe3ec;--panel:#fff;--bg:#f5f8fb;--blue:#1769a8;--blue2:#2675ad;--orange:#ef8a24;--pink:#e85d75;--green:#16804b;}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.topbar{height:64px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 34px;position:sticky;top:0;z-index:10}.brand{font-weight:800;font-size:20px}.topbar nav{display:flex;gap:22px}.topbar a{color:var(--ink);text-decoration:none;font-size:14px}.topbar a:hover{color:var(--blue)}main{max-width:1480px;margin:0 auto;padding:34px 28px 70px}.page{display:none}.page.active{display:block}h1{font-size:34px;line-height:1.12;margin:0 0 8px}.subtitle{color:var(--muted);margin:0 0 24px}.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:30px;align-items:center}.eyebrow{font-size:12px;letter-spacing:.14em;font-weight:800;color:var(--blue)}.hero h1{font-size:46px;max-width:800px}.lead{font-size:17px;line-height:1.65;color:#40536a;max-width:820px}.actions{display:flex;gap:12px;margin-top:22px}.primary,.secondary,.download{border:0;border-radius:9px;padding:11px 16px;font-weight:750;cursor:pointer}.primary{background:var(--blue);color:#fff}.secondary,.download{background:#e9eff5;color:var(--ink)}.device-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:0 12px 35px rgba(22,54,85,.06)}.device-card svg{display:block;width:100%;height:auto}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:28px}.grid3 article,.note{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px}.grid3 h3{margin:0 0 8px}.grid3 p,.note{color:#50647a;line-height:1.55}.panel,.chartcard{background:var(--panel);border:1px solid var(--line);border-radius:15px;padding:18px;margin-top:16px}.dropzone{border:1.5px dashed #9eb8d2;border-radius:14px;min-height:145px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;cursor:pointer;background:#fbfdff;transition:.15s}.dropzone.dragover{background:#eef7ff;border-color:var(--blue);transform:translateY(-1px)}.dropzone input{display:none}.dropicon{font-weight:900;color:var(--blue);font-size:12px;border:1px solid #bdd0e1;border-radius:7px;padding:5px 8px}.dropzone strong{font-size:16px}.dropzone span{color:var(--blue)}.dropzone small{color:var(--muted);text-align:center;max-width:720px}.status{background:#edf8f1;color:var(--green);border-radius:8px;padding:10px 12px;margin-top:12px}.hidden{display:none!important}.chips{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.chip{background:#edf3f8;border-radius:999px;padding:7px 11px;font-size:13px}.formgrid{display:grid;gap:14px;margin-top:15px}.formgrid.four{grid-template-columns:repeat(4,1fr)}.formgrid.three{grid-template-columns:repeat(3,1fr)}.formgrid.two{grid-template-columns:repeat(2,1fr)}label{font-size:13px;font-weight:700;color:#17324d}label input,label select{display:block;width:100%;margin-top:7px;border:1px solid #cfd9e3;border-radius:8px;padding:10px;background:#fff;color:var(--ink);font:inherit}.shortinput{max-width:260px}.switchline{display:flex;align-items:center;gap:8px;margin-top:15px}.switchline input{width:auto;margin:0}.equation-box{background:#f7f9fc;border:1px solid var(--line);border-radius:12px;padding:15px;margin-top:16px}.eq-title{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:800}.equation{font-size:22px;font-weight:800;margin:9px 0}.equation-box p{margin:0;color:var(--muted);font-size:13px}.stored{margin-top:12px;background:#f4f7fa;border-radius:9px;padding:10px;color:var(--muted);font-size:13px}.error{background:#fff0f1;color:#b4232e;border-radius:8px;padding:10px 12px;margin-top:12px}.resultgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:16px}.metric{background:#fff;border:1px solid var(--line);border-radius:13px;padding:15px}.metric .label{font-size:12px;color:var(--muted);font-weight:600}.metric .value{font-size:22px;font-weight:800;margin-top:7px}.chartcard{margin-top:16px}.charthead{display:flex;justify-content:space-between;align-items:center;gap:12px}.charthead h2{font-size:18px;margin:0}.chartwrap{height:410px;margin-top:10px}.chartwrap.tall{height:470px}.chartwrap canvas{width:100%;height:100%;display:block}.legend{display:flex;flex-wrap:wrap;gap:18px;margin-top:7px;color:var(--muted);font-size:12px}.legenddot{display:inline-block;width:9px;height:9px;border-radius:50%;background:var(--blue2);margin-right:6px}.legenddot.synthetic{background:var(--pink)}.legendline{display:inline-block;width:24px;height:3px;background:var(--orange);vertical-align:middle;margin-right:6px}.smallinfo{color:var(--muted);font-size:12px;margin-top:9px}.fitgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.mini{border:1px solid var(--line);border-radius:10px;padding:11px;font-size:13px;line-height:1.55}.mcgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.download-group{display:flex;gap:8px;flex-wrap:wrap}.histgrid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:18px}.histgrid>div{min-width:0}.histgrid h3{font-size:14px;margin:0 0 6px;color:var(--ink)}.histwrap{height:300px}.histwrap canvas{width:100%;height:100%;display:block}.mcgrid>div{background:#f7f9fc;border-radius:10px;padding:15px}.mcgrid b{display:block;color:var(--muted);font-size:12px}.mcgrid strong{display:block;font-size:20px;margin-top:6px}.device-columns{display:grid;grid-template-columns:1fr 1fr;gap:18px}.device-section img{display:block;width:100%;height:auto;max-height:460px;object-fit:contain;border:1px solid var(--line);border-radius:10px;background:#fff}.device-section pre{background:#0e1a27;color:#dbe8f5;border-radius:10px;padding:14px;min-height:130px;white-space:pre-wrap}.note{margin-top:18px}
@media(max-width:1000px){.hero{grid-template-columns:1fr}.grid3,.device-columns{grid-template-columns:1fr}.formgrid.four,.formgrid.three,.formgrid.two,.resultgrid{grid-template-columns:1fr 1fr}.fitgrid{grid-template-columns:1fr 1fr}.histgrid{grid-template-columns:1fr}}
@media(max-width:650px){.topbar{padding:0 15px;height:auto;min-height:60px}.topbar nav{gap:10px;flex-wrap:wrap;justify-content:flex-end}.topbar a{font-size:12px}main{padding:22px 14px 50px}.hero h1{font-size:34px}.formgrid.four,.formgrid.three,.formgrid.two,.resultgrid,.fitgrid,.mcgrid{grid-template-columns:1fr}.chartwrap,.chartwrap.tall{height:350px}}

.data-intro h2,.data-note h2{margin-top:0}.data-section{margin-top:22px}.section-title{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.section-title h2{font-size:20px;margin:0 0 10px}.data-count{color:var(--muted);font-size:12px}.data-list{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.data-card{background:#fff;border:1px solid var(--line);border-radius:13px;padding:16px;display:flex;align-items:center;justify-content:space-between;gap:16px}.data-card h3{margin:0 0 5px;font-size:15px}.data-card p{margin:0;color:var(--muted);font-size:13px;line-height:1.45}.data-card .filemeta{margin-top:7px;color:#7a8999;font-size:11px}.data-empty{background:#fff;border:1px dashed #b9c8d7;border-radius:13px;padding:18px;color:var(--muted);font-size:13px}.data-note{margin-top:24px}
@media(max-width:900px){.data-list{grid-template-columns:1fr}}

.download-group{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.distance-legend{gap:14px 18px;flex-wrap:wrap}.distance-legend .legenddot{width:9px;height:9px;border-radius:50%;display:inline-block;margin-right:5px}