:root {
  --ink: #1c1814;
  --paper: #e8dcc8;
  --deep: #2a3d36;
  --accent: #b85c38;
  --line: rgba(28, 24, 20, 0.18);
  --glow: rgba(42, 61, 54, 0.35);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(184, 92, 56, 0.18), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(42, 61, 54, 0.22), transparent 50%),
    linear-gradient(160deg, #f3ebe0 0%, #d9cbb6 45%, #cbb9a0 100%);
}

.page {
  width: min(880px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 3rem;
}

.hero {
  margin-bottom: 1.5rem;
}

.brand {
  margin: 0;
  font-size: clamp(2.8rem, 8vw, 4.5rem);
  line-height: 0.95;
  letter-spacing: 0.12em;
  font-family: "STSong", "Songti SC", "Noto Serif SC", serif;
  color: var(--deep);
}

h1 {
  margin: 0.6rem 0 0.4rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.sub {
  margin: 0;
  max-width: 36rem;
  opacity: 0.75;
  font-size: 0.95rem;
}

.panel, .result, .note {
  background: color-mix(in srgb, var(--paper) 88%, white);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1rem 1.1rem;
  box-shadow: 0 10px 30px var(--glow);
}

.panel { margin-bottom: 1rem; }
.result { margin-bottom: 1rem; }
.note { opacity: 0.85; font-size: 0.9rem; }

.row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.85rem;
}

label.check {
  flex-direction: row;
  align-items: end;
  gap: 0.45rem;
  padding-bottom: 0.35rem;
}

input, select, button {
  font: inherit;
}

input, select {
  border: 1px solid var(--line);
  background: #f7f1e6;
  border-radius: 3px;
  padding: 0.45rem 0.55rem;
}

.actions {
  margin-top: 1rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

button {
  border: 0;
  background: var(--deep);
  color: #f4efe6;
  padding: 0.55rem 1.1rem;
  border-radius: 3px;
  cursor: pointer;
}

button:hover { filter: brightness(1.08); }
button:disabled { opacity: 0.55; cursor: wait; }

.status { font-size: 0.9rem; opacity: 0.8; }

#summary {
  white-space: pre-wrap;
  background: rgba(42, 61, 54, 0.06);
  padding: 0.75rem;
  border-radius: 3px;
  font-size: 0.9rem;
}

#route {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
  max-height: 420px;
  overflow: auto;
  font-size: 0.92rem;
}

#route li { margin: 0.2rem 0; }