:root {
  --bg-top: #f8c34a;
  --bg-bottom: #f6efe4;
  --card: #fffdfa;
  --line: rgba(214, 162, 56, 0.28);
  --gold: #d6a238;
  --accent: #ea4028;
  --text: #261300;
  --muted: #8f7858;
  --shadow: 0 16px 40px rgba(142, 101, 24, 0.14);
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  min-height: 100%;
  background: linear-gradient(180deg, var(--bg-top) 0%, #fdf4da 16%, var(--bg-bottom) 100%);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
}
body { display: flex; justify-content: center; }
.calc-page {
  width: min(100%, 430px);
  min-height: 100vh;
  padding: 16px 14px 24px;
}
.calc-header, .calc-card {
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.calc-header {
  border-radius: 22px;
  padding: 16px;
  display: flex;
  gap: 14px;
  align-items: center;
}
.back-link {
  color: #8d6500;
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
}
.calc-title {
  font-size: 22px;
  font-weight: 800;
}
.calc-subtitle {
  margin-top: 4px;
  font-size: 12px;
  color: var(--muted);
}
.calc-card {
  margin-top: 14px;
  border-radius: 24px;
  padding: 18px 14px;
}
.field + .field { margin-top: 16px; }
.field label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 700;
  color: #6f5120;
}
.field input {
  width: 100%;
  height: 48px;
  border-radius: 14px;
  border: 1px solid var(--line);
  padding: 0 14px;
  font-size: 16px;
  outline: none;
  background: #fffdf9;
}
.type-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.type-btn {
  height: 44px;
  border-radius: 14px;
  border: 1px solid rgba(214, 162, 56, 0.22);
  background: #fff8ec;
  color: #6b4b19;
  font-size: 14px;
  font-weight: 700;
}
.type-btn.is-active {
  background: linear-gradient(180deg, #ffab33, #ff8912);
  color: #fff;
  border-color: transparent;
}
.summary-card {
  margin-top: 18px;
  border-radius: 20px;
  padding: 18px 16px;
  background: linear-gradient(180deg, #fff9ef, #fff3dc);
  border: 1px solid rgba(214, 162, 56, 0.24);
  text-align: center;
}
.summary-label {
  font-size: 14px;
  color: var(--muted);
}
.summary-value {
  margin-top: 8px;
  font-size: 44px;
  line-height: 1;
  font-weight: 800;
  color: var(--accent);
}
.summary-meta {
  margin-top: 10px;
  font-size: 13px;
  color: #8b6a3e;
}