/* ===================== 基础与变量 ===================== */
:root {
  --green: #2e7d32;
  --green-dark: #1b5e20;
  --green-light: #e8f5e9;
  --earth: #8d6e63;
  --earth-light: #efebe9;
  --bg: #f4f7f2;
  --panel: #ffffff;
  --text: #213027;
  --muted: #6b7a6f;
  --border: #e0e7df;
  --low: #e53935;
  --mid: #fb8c00;
  --high: #43a047;
  --shadow: 0 2px 10px rgba(33, 48, 39, .08);
  --radius: 12px;
}
[data-theme="dark"] {
  --bg: #161b17;
  --panel: #1f2621;
  --text: #e6efe7;
  --muted: #9fb0a3;
  --border: #324034;
  --green-light: #1d2b1f;
  --earth-light: #2a221d;
  --shadow: 0 2px 10px rgba(0,0,0,.4);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  font-size: 15px;
}
h1, h2, h3 { margin: 0; font-weight: 700; }
.hidden { display: none !important; }

/* ===================== 顶栏 ===================== */
.topbar {
  background: linear-gradient(120deg, var(--green-dark), var(--green));
  color: #fff;
  box-shadow: var(--shadow);
}
.topbar-inner {
  max-width: 1200px; margin: 0 auto; padding: 14px 18px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 30px; }
.topbar h1 { font-size: 19px; }
.subtitle { margin: 2px 0 0; font-size: 13px; opacity: .9; }

/* ===================== 布局 ===================== */
.container {
  max-width: 1200px; margin: 18px auto; padding: 0 14px;
  display: grid; grid-template-columns: 420px 1fr; gap: 18px;
  align-items: start;
}
.panel {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow);
}
.panel-title {
  font-size: 15px; color: var(--green); margin: 18px 0 10px;
  padding-left: 9px; border-left: 4px solid var(--green);
}
.panel-title:first-child { margin-top: 0; }

/* ===================== 表单 ===================== */
.field { margin-bottom: 12px; position: relative; }
label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 5px; }
.unit { font-weight: 400; color: var(--muted); font-size: 12px; }
input[type="number"], select {
  width: 100%; padding: 9px 11px; font-size: 14px;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--panel); color: var(--text); outline: none;
  transition: border .15s;
}
input[type="number"]:focus, select:focus { border-color: var(--green); }
.range { width: 100%; margin-top: 8px; accent-color: var(--green); }
.hint { font-size: 12px; color: var(--muted); margin: 5px 0 0; }
.grid3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }

.grade-badge {
  display: none; position: absolute; right: 10px; top: 30px;
  font-size: 11px; padding: 2px 8px; border-radius: 10px; color: #fff; font-weight: 700;
}
.grade-badge.show { display: inline-block; }
.grade-badge.low { background: var(--low); }
.grade-badge.mid { background: var(--mid); }
.grade-badge.high { background: var(--high); }

.actions { display: flex; gap: 10px; margin-top: 16px; }
.primary-btn {
  flex: 1; background: var(--green); color: #fff; border: none;
  padding: 12px; border-radius: 9px; font-size: 15px; font-weight: 700; cursor: pointer;
  transition: background .15s;
}
.primary-btn:hover { background: var(--green-dark); }
.ghost-btn {
  background: transparent; color: var(--text); border: 1px solid var(--border);
  padding: 12px 14px; border-radius: 9px; font-size: 14px; cursor: pointer;
}
.ghost-btn.sm { padding: 6px 10px; font-size: 13px; }
.ghost-btn:hover { background: var(--green-light); }

/* ===================== 结果区 ===================== */
.empty { text-align: center; color: var(--muted); padding: 50px 10px; }
.empty-icon { font-size: 46px; margin-bottom: 10px; }
.result-head { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.result-head h2 { font-size: 18px; color: var(--green-dark); }
.result-actions { display: flex; gap: 8px; }
.block-title {
  font-size: 14.5px; color: var(--text); margin: 20px 0 10px;
  padding-bottom: 6px; border-bottom: 1px dashed var(--border);
}

.summary {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px;
}
.summary .chip {
  background: var(--green-light); color: var(--green-dark);
  padding: 6px 12px; border-radius: 20px; font-size: 13px; font-weight: 600;
}
.summary .chip b { color: var(--green-dark); }

.grade-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; }
.grade-card {
  border: 1px solid var(--border); border-radius: 9px; padding: 10px; text-align: center;
}
.grade-card .g-name { font-size: 12.5px; color: var(--muted); }
.grade-card .g-val { font-size: 18px; font-weight: 800; margin: 2px 0; }
.grade-card .g-grade { font-size: 12px; font-weight: 700; padding: 2px 9px; border-radius: 10px; color: #fff; }
.grade-card .g-grade.low { background: var(--low); }
.grade-card .g-grade.mid { background: var(--mid); }
.grade-card .g-grade.high { background: var(--high); }
.grade-card .g-tip { font-size: 11px; color: var(--muted); margin-top: 5px; text-align: left; }

.table-wrap { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.data-table th, .data-table td { padding: 8px 10px; border-bottom: 1px solid var(--border); text-align: center; }
.data-table th { background: var(--green-light); color: var(--green-dark); font-weight: 700; }
.data-table td:first-child, .data-table th:first-child { text-align: left; }
.data-table .nut { font-weight: 700; color: var(--green); }

.fert-card {
  border: 1px solid var(--border); border-radius: 9px; padding: 12px; margin-bottom: 10px;
  background: var(--panel);
}
.fert-card .f-head { display: flex; justify-content: space-between; align-items: center; }
.fert-card .f-name { font-weight: 700; }
.fert-card .f-amount { font-size: 16px; font-weight: 800; color: var(--green-dark); }
.fert-card .f-sub { font-size: 12px; color: var(--muted); margin-top: 4px; }
.fert-card .f-split { display: flex; gap: 10px; margin-top: 8px; font-size: 12.5px; }
.fert-card .f-split span { background: var(--earth-light); padding: 3px 9px; border-radius: 8px; }

.ratio-wrap { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.donut { width: 160px; height: 160px; flex: 0 0 auto; }
.ratio-legend { font-size: 14px; }
.ratio-legend .lg { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.ratio-legend .dot { width: 14px; height: 14px; border-radius: 4px; }
.ratio-legend b { font-size: 16px; }

.advice { padding-left: 18px; margin: 0; }
.advice li { margin-bottom: 7px; font-size: 13.5px; }
.disclaimer { font-size: 11.5px; color: var(--muted); margin-top: 16px; border-top: 1px dashed var(--border); padding-top: 10px; }

.saved-block { margin-top: 18px; }
.saved-list { display: flex; flex-direction: column; gap: 8px; }
.saved-item {
  display: flex; justify-content: space-between; align-items: center;
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; font-size: 13px;
}
.saved-item .s-info b { color: var(--green-dark); }
.saved-item button { border: none; background: var(--green-light); color: var(--green-dark);
  border-radius: 6px; padding: 4px 9px; cursor: pointer; font-size: 12px; }

/* ===================== 页脚 ===================== */
.footer { text-align: center; color: var(--muted); font-size: 12.5px; padding: 24px 10px 36px; }

/* ===================== 响应式（移动端） ===================== */
@media (max-width: 860px) {
  .container { grid-template-columns: 1fr; }
  .topbar h1 { font-size: 17px; }
  .grid3 { grid-template-columns: 1fr; }
  .panel { padding: 14px; }
  .ratio-wrap { justify-content: center; }
}
@media (max-width: 480px) {
  .subtitle { display: none; }
  .summary .chip { font-size: 12px; padding: 5px 10px; }
}

/* ===================== 打印 ===================== */
@media print {
  .topbar, .form-panel, .footer, .no-print, .saved-block { display: none !important; }
  body { background: #fff; }
  .container { display: block; margin: 0; }
  .panel { box-shadow: none; border: none; padding: 0; }
  .result { display: block !important; }
}