:root { --ink:#15242e; --muted:#526a75; --line:#c7d3d7; --teal:#183c47; --paper:#fff; --ground:#edf1f3; }
*{box-sizing:border-box} body{margin:0;font:14px "Segoe UI","Yu Gothic UI","Microsoft YaHei UI",Arial,sans-serif;background:var(--ground);color:var(--ink)} header{display:flex;align-items:center;gap:16px;min-height:54px;padding:9px 18px;background:var(--teal);color:#fff}header strong{font-size:17px}header a{color:#e2f6fa;text-decoration:none;border-bottom:1px solid #94c8d2}.language-control{margin-left:auto;display:flex;align-items:center;gap:5px;font-size:12px}.language-control select{width:88px;margin:0;padding:5px}
main{max-width:1320px;margin:0 auto;display:grid;grid-template-columns:minmax(280px,.8fr) minmax(390px,1.2fr);gap:14px;padding:16px}.analysis-intro{grid-column:1/-1;padding:0 2px}.analysis-intro h1{margin:0 0 6px;font-size:22px}.analysis-intro p{max-width:900px;margin:0;color:#385560;line-height:1.55}section{padding:16px;background:var(--paper);border:1px solid var(--line);border-radius:6px}h2{font-size:17px;margin:0 0 10px}label{display:block;margin:10px 0;font-weight:650}label span{display:block;margin-bottom:4px}input,select,textarea,button{font:inherit}input,select,textarea{display:block;width:100%;padding:8px;border:1px solid #8fa3aa;border-radius:3px;background:#fff}button{min-height:34px;padding:7px 11px;border:1px solid #6b818a;border-radius:4px;background:#fff;color:#17333d;cursor:pointer}button:hover{background:#edf8fa}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,a:focus-visible{outline:3px solid #7bc9e6;outline-offset:2px}.primary{background:#0878a9;color:#fff;border-color:#075e8a}.primary:hover{background:#08698f}.control-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.route-settings .control-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.result{grid-column:2;grid-row:2/span 2}.result img{display:block;width:100%;height:auto;border:1px solid #a9b8be;margin:12px 0}.result img[hidden]{display:none!important}.result a{color:#005f92;font-weight:650}.help{font-size:12px;color:var(--muted);line-height:1.5}#routeResult,#obstacles{margin-top:10px}.record{border-top:1px solid #d5dfe2;padding:8px 0}.record button{min-height:28px;padding:4px 7px;margin:3px 4px 0 0}.obstacle-settings{grid-column:1/-1}.obstacle-settings details summary{cursor:pointer;font-size:16px;font-weight:700}.obstacle-settings details[open] summary{margin-bottom:12px}.obstacle-actions{display:flex;gap:8px;margin:8px 0}#obstacleMap{display:block;width:100%;height:340px;background:#d9e2e5;border:1px solid #a9b8be;cursor:crosshair}footer{position:sticky;bottom:0;min-height:28px;padding:6px 10px;background:#1e3039;color:#e4eef1;font-size:12px}
@media(max-width:900px){main{grid-template-columns:1fr;padding:10px}.result{grid-column:auto;grid-row:auto}.analysis-intro{padding:4px 0}.control-grid,.route-settings .control-grid{grid-template-columns:repeat(2,minmax(0,1fr))}header{flex-wrap:wrap;gap:8px}.language-control{margin-left:0;margin-right:auto}}
@media(max-width:560px){body{font-size:15px}header{padding:9px 12px}header strong{order:-1;flex-basis:100%;font-size:16px}.analysis-intro h1{font-size:19px}section{padding:12px}.control-grid,.route-settings .control-grid{grid-template-columns:1fr}#obstacleMap{height:260px}}