/* 重置与基础 */
* { box-sizing: border-box; }
html, body {
  height: 100%;
  margin: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-family: "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft Yahei", Arial, sans-serif;
  background: linear-gradient(180deg, #f7f9fc 0%, #eef3f8 100%);
  color: #0f1724;
  font-size: 18px;
}

/* 使用 body.loaded 的淡入效果（index.html 已声明） */
body { opacity: 0; transition: opacity 0.28s ease; min-height: 100vh; display: block; padding: 24px; padding-top: calc(24px + env(safe-area-inset-top)); }
body.loaded { opacity: 1; }

/* 中心容器：限制最大宽度并居中 */
.app-wrapper {
  width: 100%;
  max-width: 1100px; /* 内容宽度上限，可根据需要调整 */
  background: #ffffff;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(15, 23, 36, 0.08);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  margin: 0 auto;
}

/* 页头 */
.app-header {
  padding: calc(22px + env(safe-area-inset-top)) 28px;
  border-bottom: 1px solid rgba(15, 23, 36, 0.06);
  text-align: center;
  background: linear-gradient(180deg, rgba(255,255,255,0.6), rgba(255,255,255,0.35));
}
.app-header .logo-area h1 {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: .2px;
}
.app-header .subtitle {
  margin: 8px 0 0;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.3;
  color: #0f1724;
  letter-spacing: .2px;
}

/* 主体布局：左侧输入、右侧结果 */
.dashboard-grid {
  display: grid;
  grid-template-columns: 360px 1fr; /* 固定左侧宽度更稳定 */
  gap: 20px;
  padding: 22px;
  align-items: start;
}

/* 面板通用 */
.panel {
  background: transparent;
}
.input-panel, .results-panel, .info-panel {
  background: #ffffff;
  border-radius: 10px;
  padding: 18px;
  box-shadow: 0 6px 18px rgba(2,6,23,0.04);
  border: 1px solid rgba(15,23,36,0.03);
}

/* 使用不同灰度背景区分两大板块（整体配色统一） */
.input-panel { background: #fbfdff; }
.results-panel { background: #f3f6fb; }

/* 面板头部 */
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}
.panel-header h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}
.badge {
  background: #eef2ff;
  color: #4338ca;
  padding: 6px 8px;
  border-radius: 999px;
  font-size: 13px;
}

/* 表单布局 */
.input-form .form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}
.form-item { margin-bottom: 12px; }
.form-item label { display: block; font-size: 13px; margin-bottom: 6px; color:#333; }
.input-form input[type="number"],
.input-form select,
.input-form .select-wrapper select {
  width: 100%;
  padding: 11px 12px;
  border-radius: 8px;
  border: 1px solid rgba(15,23,36,0.08);
  background: #fff;
  font-size: 16px;
  color: #0f1724;
}

/* 辅助 UI */
.help-btn, .help-btn-sm {
  background: transparent;
  border: none;
  cursor: pointer;
  color: #6b7280;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.help-popover {
  display: none;
  position: absolute;
  z-index: 40;
  background: #fff;
  border: 1px solid rgba(15, 23, 36, 0.06);
  padding: 10px;
  border-radius: 8px;
  box-shadow: 0 8px 22px rgba(2,6,23,0.06);
}

/* 术语说明小字（银灰色） */
.term-hint {
  display: inline-block;
  margin-left: 6px;
  color: #7b8794;
  font-size: 12px;
}
.sub-text { color: #7b8794; font-size: 12px; }

/* 固定底部操作 */
.sticky-actions {
  display: flex;
  gap: 10px;
  justify-content: center; /* 按钮居中 */
  padding-top: 8px;
}
.btn-primary {
  background: #0f1724;
  color: #fff;
  border: none;
  padding: 12px 16px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  max-width: 520px;
  margin: 8px auto 0;
}
.btn-icon { font-size: 16px; }

/* 结果区微调 */
.results-content { display: block; }
.metrics-dashboard {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 16px;
  justify-items: center;
}
.metric-card {
  background: linear-gradient(180deg, #fff 0%, #fbfdff 100%);
  border-radius: 10px;
  padding: 12px;
  border: 1px solid rgba(15,23,36,0.03);
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  max-width: 320px;
}
.metric-card.primary-metric { grid-column: span 2; display:flex; justify-content:space-between; align-items:center; padding: 14px 16px; width: 100%; max-width: none; }
.metric-header { display:flex; gap:8px; align-items:center; }
.metric-header h3 { margin:0; font-size:14px; }
.metric-value { display:flex; align-items:baseline; gap:8px; }
.metric-value .number { font-size: 26px; font-weight:700; color:#0f1724; }
.metric-value .unit { font-size:13px; color:#55606a; }

/* 宏量营养素网格 */
.macros-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 16px;
  justify-items: center;
}
.macro-item { background: #fbfdff; border-radius: 8px; padding: 10px; text-align: center; border: 1px solid rgba(15,23,36,0.03); width: 100%; max-width: 280px; }
.macro-label { font-size: 14px; color: #334155; margin-bottom: 6px; }
.macro-val { font-weight:700; font-size: 17px; color:#0f1724; }
.macro-gram { font-size: 14px; color:#64748b; }

/* 预测与建议 */
.prediction-box { background: #fff; border-radius: 8px; padding: 12px; border: 1px solid rgba(15,23,36,0.03); }
.prediction-row { display:flex; gap:12px; align-items:center; margin-bottom:8px; }
.prediction-row .icon { font-size:18px }

/* 页脚 */
.app-footer {
  padding: 14px 20px;
  font-size: 12px;
  color: #6b7280;
  text-align: center;
  border-top: 1px solid rgba(15, 23, 36, 0.04);
  margin-top: 12px;
}

.info-panel .info-content {
  color: #7b8794;
  font-size: 12px;
}

/* 响应式：小屏时改成单列，内容居中并适当缩小间距 */
@media (max-width: 1000px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
    padding: 16px;
  }
  .metrics-dashboard { grid-template-columns: 1fr 1fr; }
  .metric-card.primary-metric { grid-column: auto; }
  .input-form .form-grid { grid-template-columns: 1fr; }
  .app-wrapper { margin: 0 8px; }
}

/* 更小屏幕 */
@media (max-width: 480px) {
  .metrics-dashboard { grid-template-columns: 1fr; }
  .macros-grid { grid-template-columns: 1fr; }
  .panel-header { flex-direction: column; align-items: flex-start; gap: 6px; }
  .sticky-actions { padding-bottom: 4px; }
}