:root{
  color-scheme:light;
  --bg:#f4f6fa;
  --panel:#ffffff;
  --line:#e1e6ee;
  --line-strong:#ccd5e0;
  --text:#1c2530;
  --muted:#66707d;
  --accent:#1e4f8f;
  --accent-hover:#163d70;
  --accent-soft:#e8f0fa;
  --accent-border:#c3d5ea;
  --accent-value:#2a6bbf;
  --danger:#b4443c;
  --radius:12px;
  font-family:Inter,"Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  font-synthesis:none;
}
*{box-sizing:border-box}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
.shell{max-width:1120px;margin:auto;padding:0 28px}

/* 顶栏 */
.topbar{
  height:60px;display:flex;align-items:center;gap:12px;
  border-bottom:1px solid var(--line);
}
.mark{width:24px;height:24px;position:relative;flex:none}
.mark-dot{width:8px;height:8px;border-radius:50%;background:var(--accent);position:absolute;left:8px;top:8px;box-shadow:0 0 10px #1e4f8f55}
.mark-orbit{position:absolute;inset:2px;border:1px solid #7fa4d4;transform:rotate(-27deg) scaleX(1.35);border-radius:50%}
.brand{font-size:11px;letter-spacing:.16em;font-weight:700;color:#3a4652}
.brand span{color:var(--accent);margin:0 5px}
.top-note{margin-left:auto;color:var(--muted);font-size:11px;letter-spacing:.06em}

/* 头部说明 */
.intro{padding:38px 0 30px}
.eyebrow{display:flex;align-items:center;gap:10px;color:var(--accent);letter-spacing:.18em;font-size:10px;font-weight:700}
.eyebrow-line{width:18px;height:1px;background:var(--accent)}
h1{
  font-size:clamp(24px,3vw,34px);
  line-height:1.3;
  letter-spacing:-.02em;
  margin:16px 0 12px;
  font-weight:700;
  color:#16202b;
}
h1 em{font-style:normal;color:var(--accent)}
.intro p{color:var(--muted);margin:0;font-size:14px;line-height:1.7}

/* 表单布局 */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.panel{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:0 1px 2px #0a1a2a0a,0 4px 16px #0a1a2a08;
}
.form-grid>.panel{padding:22px}
.panel-heading{display:flex;align-items:flex-start;gap:14px;margin-bottom:22px}
.number{
  font-size:11px;font-weight:700;color:var(--accent);
  background:var(--accent-soft);
  border-radius:6px;padding:7px 9px;line-height:1;
}
.panel-heading h2,.result h2{font-size:16px;margin:0 0 5px;letter-spacing:.01em;color:#16202b}
.panel-heading p{font-size:12px;color:var(--muted);margin:0}

/* 输入格 */
.time-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px 10px}
.time-grid label,.elements-grid label{color:#4c5967;font-size:12px;display:flex;flex-direction:column;gap:6px}
.time-grid input,.elements-grid input{
  width:100%;border:1px solid var(--line-strong);background:#fbfcfd;color:var(--text);
  padding:10px 11px;border-radius:8px;
  font:500 14px ui-monospace,SFMono-Regular,Consolas,monospace;
  outline:none;transition:border-color .15s,box-shadow .15s,background .15s;
}
.time-grid input:hover,.elements-grid input:hover{border-color:#b0bcca}
.time-grid input:focus,.elements-grid input:focus{
  border-color:var(--accent);background:#fff;
  box-shadow:0 0 0 3px #1e4f8f1f;
}
input::-webkit-inner-spin-button{-webkit-appearance:none}
input[type=number]{appearance:textfield;-moz-appearance:textfield}

.elements-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px 12px}
.elements-grid label b{color:#16202b;font-weight:600}
.input-unit{position:relative}
.input-unit input{padding-right:44px}
.input-unit small{position:absolute;right:11px;top:50%;transform:translateY(-50%);color:#8a97a5;font-size:11px}

.hint{border-top:1px solid var(--line);margin-top:20px;padding-top:14px;color:var(--muted);font-size:12px;line-height:1.6}
.hint strong{color:var(--accent);font-weight:600}

/* 按钮栏 */
.action-bar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:22px 0 30px}
.action-bar p{font-size:12px;color:var(--muted)}
.action-bar button{
  display:flex;align-items:center;justify-content:space-between;gap:28px;
  border:0;border-radius:9px;background:var(--accent);color:#fff;
  padding:13px 18px;font-size:14px;font-weight:700;cursor:pointer;min-width:196px;
  transition:background .15s,transform .15s,box-shadow .15s;
  box-shadow:0 1px 2px #1e4f8f33;
}
.action-bar button:hover{background:var(--accent-hover);transform:translateY(-1px);box-shadow:0 3px 10px #1e4f8f33}
.action-bar button:disabled{opacity:.65;cursor:wait}

/* 结果区 */
.result{padding:24px;margin-bottom:30px}
.result-top{display:flex;align-items:center;justify-content:space-between;gap:14px}
.result-kicker{font-size:10px;color:var(--accent);letter-spacing:.18em;font-weight:700;display:block;margin-bottom:6px}
.result-top button{
  border:1px solid var(--accent-border);color:var(--accent);background:var(--accent-soft);
  padding:9px 12px;border-radius:8px;cursor:pointer;font-size:12px;font-weight:600;
  transition:background .15s;
}
.result-top button:hover{background:#dbe7f7}
.timestamp{color:var(--muted);font:13px ui-monospace,Consolas,monospace;margin:16px 0 18px}
.result-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.result-grid>div{border:1px solid var(--line);border-radius:10px;background:#fafbfe;padding:16px}
.result-grid h3{font-size:12px;font-weight:600;color:#4c5967;margin:0 0 12px}
.result-grid h3 span{float:right;color:var(--accent-value)}
.vector{display:grid;gap:6px}
.vector div{display:flex;justify-content:space-between;gap:10px;font:13px ui-monospace,SFMono-Regular,Consolas,monospace}
.vector span{color:var(--accent-value)}
.vector strong{font-weight:500;white-space:nowrap;color:#16202b}
.eop-note{color:var(--muted);font-size:12px;margin:16px 0 0}

.error{border:1px solid #e8b4b0;background:#fdf2f1;color:var(--danger);border-radius:9px;padding:12px 15px;margin:0 0 26px;font-size:13px}

footer{
  border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:12px;
  padding:18px 0 28px;color:#98a4b1;font-size:10px;letter-spacing:.08em;
}
footer i{color:var(--accent);font-style:normal;margin:0 5px}

[hidden]{display:none!important}

@media(max-width:760px){
  .shell{padding:0 16px}
  .topbar{height:56px}
  .top-note{display:none}
  .intro{padding:28px 0 22px}
  .form-grid{grid-template-columns:1fr}
  .form-grid>.panel{padding:18px}
  .action-bar{align-items:stretch;flex-direction:column}
  .action-bar p{margin:0}
  .action-bar button{width:100%}
  .result-grid{grid-template-columns:1fr}
  .result{padding:18px}
  .result-top{align-items:flex-start}
  footer{flex-direction:column}
}
@media(max-width:390px){
  .time-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .elements-grid{grid-template-columns:1fr}
  .result-top{flex-direction:column}
  .vector strong{font-size:12px}
}