:root {
  --green: #4caf7d;
  --green-dark: #2e7d54;
  --green-light: #e8f5ee;
  --orange: #ff9f43;
  --text: #2d3436;
  --muted: #6b7b74;
  --bg: #f6faf7;
  --card: #ffffff;
  --border: #dcebe2;
  --warn-bg: #fff7e0;
  --warn-border: #f2c14e;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}
.container { max-width: 1000px; margin: 0 auto; padding: 0 20px; }

/* 导航栏 */
.navbar {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
  box-shadow: 0 1px 4px rgba(0,0,0,.04);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.logo { font-size: 20px; font-weight: 700; color: var(--green-dark); text-decoration: none; display: flex; align-items: center; gap: 8px; }
.logo .leaf { font-size: 24px; }
.nav-links { display: flex; gap: 8px; flex-wrap: wrap; }
.nav-links a {
  text-decoration: none; color: var(--muted); padding: 8px 16px; border-radius: 20px;
  font-size: 15px; transition: all .2s;
}
.nav-links a:hover { background: var(--green-light); color: var(--green-dark); }
.nav-links a.active { background: var(--green); color: #fff; font-weight: 600; }

/* 提示条 */
.disclaimer {
  background: var(--warn-bg); border: 1px solid var(--warn-border);
  color: #8a6d1a; border-radius: 10px; padding: 10px 16px; font-size: 14px;
  margin: 16px 0; display: flex; gap: 8px; align-items: flex-start;
}
.disclaimer .icon { flex-shrink: 0; }

/* 首页 hero */
.hero {
  background: linear-gradient(135deg, #e8f5ee 0%, #d4eddf 100%);
  border-radius: 18px; padding: 56px 40px; text-align: center; margin: 24px 0 32px;
}
.hero h1 { font-size: 34px; color: var(--green-dark); margin-bottom: 14px; letter-spacing: 1px; }
.hero p.sub { font-size: 17px; color: var(--muted); max-width: 640px; margin: 0 auto 28px; }
.hero .cta-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 12px 28px; border-radius: 26px; text-decoration: none;
  font-size: 16px; font-weight: 600; transition: all .2s; border: none; cursor: pointer;
}
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: var(--green-dark); transform: translateY(-2px); }
.btn-outline { background: #fff; color: var(--green-dark); border: 2px solid var(--green); }
.btn-outline:hover { background: var(--green-light); transform: translateY(-2px); }

/* 卡片 */
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 26px 28px; margin-bottom: 20px;
}
.card h2 { font-size: 21px; color: var(--green-dark); margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
.page-title { font-size: 28px; color: var(--green-dark); margin: 30px 0 6px; }
.page-sub { color: var(--muted); margin-bottom: 22px; }

/* 首页特性网格 */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; margin: 20px 0; }
.feature { background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 26px; transition: all .2s; }
.feature:hover { transform: translateY(-4px); box-shadow: 0 8px 20px rgba(76,175,125,.15); }
.feature .icon { font-size: 34px; margin-bottom: 10px; }
.feature h3 { font-size: 18px; color: var(--green-dark); margin-bottom: 8px; }
.feature p { font-size: 14px; color: var(--muted); }
.feature a { text-decoration: none; }

/* 表单 */
.form-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end; margin-bottom: 12px; }
.form-group { display: flex; flex-direction: column; gap: 4px; flex: 1; min-width: 150px; }
.form-group label { font-size: 13px; color: var(--muted); }
.form-group input, .form-group select {
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 15px;
  background: #fff;
}
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--green); }
.meal-section { border-left: 4px solid var(--green); padding-left: 16px; margin-bottom: 24px; }
.meal-section h3 { color: var(--green-dark); margin-bottom: 10px; font-size: 17px; }
.food-row { display: flex; gap: 8px; margin-bottom: 8px; flex-wrap: wrap; }
.food-row select { flex: 2; min-width: 160px; }
.food-row input { flex: 1; min-width: 90px; width: 110px; }
.add-btn {
  background: var(--green-light); color: var(--green-dark); border: 1px dashed var(--green);
  border-radius: 8px; padding: 8px 14px; cursor: pointer; font-size: 14px;
}
.add-btn:hover { background: #d4eddf; }
.calc-btn {
  background: var(--orange); color: #fff; font-size: 17px; padding: 14px 40px;
  border-radius: 30px; border: none; cursor: pointer; font-weight: 700;
}
.calc-btn:hover { filter: brightness(1.08); }

/* 结果 */
.result-summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 14px; margin: 16px 0; }
.stat {
  background: var(--green-light); border-radius: 12px; padding: 18px; text-align: center;
}
.stat .num { font-size: 26px; font-weight: 700; color: var(--green-dark); }
.stat .label { font-size: 13px; color: var(--muted); }
.bar-wrap { margin: 10px 0 18px; }
.bar-row { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; font-size: 14px; }
.bar-row .name { width: 90px; text-align: right; color: var(--muted); }
.bar-track { flex: 1; background: #eef3ef; border-radius: 6px; height: 20px; overflow: hidden; }
.bar-fill { height: 100%; border-radius: 6px; transition: width .6s ease; }
.bar-row .pct { width: 110px; font-size: 13px; color: var(--muted); }
.tag { display: inline-block; padding: 3px 12px; border-radius: 14px; font-size: 13px; font-weight: 600; }
.tag-good { background: #e0f2e9; color: var(--green-dark); }
.tag-warn { background: var(--warn-bg); color: #8a6d1a; }
.tag-bad { background: #fde8e8; color: #c0392b; }

/* 表格 */
table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); }
th { background: var(--green-light); color: var(--green-dark); font-weight: 600; }

/* 分工卡片 */
.role-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 20px 0; }
@media (max-width: 700px) { .role-grid { grid-template-columns: 1fr; } }
.role-card { border-radius: 14px; padding: 26px; }
.role-ai { background: linear-gradient(135deg, #eef4ff, #e0eaff); border: 1px solid #c5d5f5; }
.role-human { background: linear-gradient(135deg, #fff5ec, #ffe9d9); border: 1px solid #f5cf9e; }
.role-card h3 { font-size: 19px; margin-bottom: 12px; }
.role-ai h3 { color: #3b5fc0; }
.role-human h3 { color: #c47a1e; }
.role-card ul { padding-left: 20px; }
.role-card li { margin-bottom: 8px; font-size: 15px; }
.flow { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: center; margin: 24px 0; }
.flow .step { background: #fff; border: 2px solid var(--green); border-radius: 12px; padding: 14px 18px; font-size: 14px; text-align: center; max-width: 200px; }
.flow .arrow { color: var(--green); font-size: 22px; font-weight: 700; }

footer { text-align: center; color: var(--muted); font-size: 13px; padding: 30px 0 40px; }
.hidden { display: none; }