:root {
  --bg: #e8eef2;
  --bg-2: #d5e2ea;
  --ink: #10232d;
  --ink-soft: #3d5562;
  --paper: #f7fafb;
  --card: #ffffff;
  --line: #c5d5de;
  --teal: #0f6b73;
  --teal-2: #14848d;
  --amber: #c47a12;
  --red: #b42318;
  --ok: #157a3c;
  --shadow: 0 10px 30px rgba(16, 35, 45, 0.08);
  --mono: "IBM Plex Mono", "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
  --sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); }
body {
  min-height: 100vh;
  background:
    radial-gradient(1200px 500px at 10% -10%, #cfe7e8 0%, transparent 55%),
    radial-gradient(900px 400px at 100% 0%, #f3e6c8 0%, transparent 50%),
    linear-gradient(180deg, #edf3f6 0%, #e4ecef 100%);
}

.app { max-width: 1280px; margin: 0 auto; padding: 20px 20px 48px; }

.topbar {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 16px;
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 18px 22px; box-shadow: var(--shadow); margin-bottom: 16px;
}
.brand { display: flex; gap: 14px; align-items: center; }
.mark {
  width: 48px; height: 48px; border-radius: 12px;
  background: linear-gradient(145deg, #0f6b73, #1a9aa3);
  color: #fff; display: grid; place-items: center; font-weight: 700; letter-spacing: 0.04em;
}
.brand h1 { font-size: 20px; margin: 0 0 4px; }
.brand p { margin: 0; color: var(--ink-soft); font-size: 13px; }
.duty-chip {
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: flex-end;
  font-family: var(--mono); font-size: 12px; color: var(--ink-soft);
}
.duty-chip span {
  background: #eef6f7; border: 1px solid #d3e4e7; padding: 4px 8px; border-radius: 999px;
}

.nav {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 16px;
}
.nav button {
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
  border-radius: 12px; padding: 12px 10px; cursor: pointer; font: inherit;
}
.nav button strong { display: block; font-size: 14px; }
.nav button small { color: var(--ink-soft); }
.nav button.active {
  background: #0f6b73; color: #fff; border-color: #0c585e;
}
.nav button.active small { color: #d7f1f3; }

.grid { display: grid; grid-template-columns: 340px 1fr; gap: 16px; }
.panel {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  box-shadow: var(--shadow); overflow: hidden;
}
.panel h2, .panel h3 { margin: 0; }
.panel-hd {
  padding: 14px 16px; border-bottom: 1px solid var(--line);
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
}
.panel-hd p { margin: 4px 0 0; color: var(--ink-soft); font-size: 12px; }
.panel-bd { padding: 16px; }

label { display: block; font-size: 12px; color: var(--ink-soft); margin: 8px 0 4px; }
input, select, textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px;
  font: inherit; background: #fff; color: var(--ink);
}
textarea { min-height: 88px; resize: vertical; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.row3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; }
.err { color: var(--red); font-size: 12px; min-height: 16px; }

.btn {
  border: 0; border-radius: 8px; padding: 8px 12px; cursor: pointer; font: inherit;
  background: var(--teal); color: #fff;
}
.btn.ghost { background: #eef4f6; color: var(--ink); border: 1px solid var(--line); }
.btn.amber { background: var(--amber); }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

.chat-log { height: 420px; overflow: auto; padding: 12px; background: #f3f7f8; }
.msg { max-width: 92%; padding: 10px 12px; border-radius: 12px; margin: 8px 0; font-size: 14px; line-height: 1.55; white-space: pre-wrap; }
.msg.user { margin-left: auto; background: #0f6b73; color: #fff; }
.msg.bot { background: #fff; border: 1px solid var(--line); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; padding: 10px 12px; border-top: 1px solid var(--line); }
.chips button {
  border: 1px dashed var(--line); background: #fff; border-radius: 999px; padding: 6px 10px;
  font-size: 12px; cursor: pointer; color: var(--ink-soft);
}
.composer { display: flex; gap: 8px; padding: 12px; border-top: 1px solid var(--line); }
.composer textarea { min-height: 52px; }

.std-list { display: grid; gap: 8px; max-height: 280px; overflow: auto; }
.std-item {
  text-align: left; border: 1px solid var(--line); background: #fff; border-radius: 10px;
  padding: 10px; cursor: pointer; font: inherit;
}
.std-item.active { border-color: var(--teal); background: #eef8f8; }
.std-item b { display: block; font-size: 13px; }
.std-item span { color: var(--ink-soft); font-size: 12px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.tag { font-size: 11px; background: #eef4f6; padding: 2px 8px; border-radius: 999px; color: var(--ink-soft); }
.clause { background: #f6fafb; border-left: 3px solid var(--teal); padding: 8px 10px; margin: 6px 0; font-size: 13px; }

.tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.tabs button { border: 1px solid var(--line); background: #fff; border-radius: 8px; padding: 6px 10px; cursor: pointer; font-size: 13px; }
.tabs button.active { background: #12313a; color: #fff; border-color: #12313a; }

.result { background: #f4f8f9; border: 1px solid var(--line); border-radius: 12px; padding: 12px; margin-top: 12px; }
.result table { width: 100%; border-collapse: collapse; font-size: 13px; }
.result th, .result td { text-align: left; padding: 6px 4px; border-bottom: 1px solid #e1eaee; }
.formula { font-family: var(--mono); font-size: 12px; color: var(--teal); margin: 0 0 8px; }
.ok { color: var(--ok); font-weight: 600; }
.warn { color: var(--amber); font-weight: 600; }
.bad { color: var(--red); font-weight: 600; }
.disclaimer {
  margin-top: 16px; font-size: 12px; color: var(--ink-soft);
  background: #fff8ea; border: 1px solid #ead7a8; border-radius: 10px; padding: 10px 12px;
}

.curve-wrap { overflow: auto; }
svg.curve { width: 100%; height: 280px; background: #fff; border: 1px solid var(--line); border-radius: 10px; }
.legend { display: flex; gap: 16px; font-size: 12px; color: var(--ink-soft); margin-top: 6px; }
.swatch { display: inline-block; width: 14px; height: 3px; margin-right: 6px; vertical-align: middle; }

.md {
  font-family: var(--mono); font-size: 12.5px; line-height: 1.55; white-space: pre-wrap;
  background: #10232d; color: #e8f0f2; border-radius: 12px; padding: 16px; min-height: 420px;
}

.view { display: none; }
.view.show { display: block; }

@media (max-width: 960px) {
  .grid { grid-template-columns: 1fr; }
  .nav { grid-template-columns: 1fr 1fr; }
  .row, .row3 { grid-template-columns: 1fr; }
}