/* ============================================================
   护肾防结石菜谱 · 样式
   移动优先 (mobile-first) + 桌面增强
   ============================================================ */

:root {
  --green: #4a8b6f;
  --green-dark: #356853;
  --green-soft: #e8f3ee;
  --green-light: #f5faf7;
  --orange: #e8895a;
  --orange-soft: #fdf0e8;
  --cream: #faf7f0;
  --text: #2d3436;
  --text-soft: #636e72;
  --line: #e6e6e6;
  --danger: #d6654e;
  --shadow: 0 2px 16px rgba(74, 139, 111, 0.08);
  --radius: 16px;
  --tabbar-h: 60px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--cream);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  /* 给底部 tabbar 留空间(手机) */
  padding-bottom: calc(var(--tabbar-h) + env(safe-area-inset-bottom));
}

/* ===== 顶部周计划切换 ===== */
.week-switcher {
  position: sticky; top: 0; z-index: 110;
  background: rgba(250, 247, 240, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  padding: 10px 16px;
  display: none; /* 只在有多周计划时显示 */
  gap: 8px;
  overflow-x: auto;
  justify-content: center;
}
.week-switcher.show { display: flex; }
.week-pill {
  flex-shrink: 0;
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 14px; font-weight: 600;
  background: #fff; color: var(--text-soft);
  border: 2px solid transparent;
  cursor: pointer; white-space: nowrap;
}
.week-pill.active { background: var(--green-soft); border-color: var(--green); color: var(--green-dark); }

/* ===== 桌面顶部导航(手机隐藏) ===== */
.topnav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(250, 247, 240, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  padding: 14px 20px;
  display: none;
  gap: 8px; justify-content: center;
}
.topnav a {
  color: var(--text-soft); text-decoration: none;
  font-size: 14px; padding: 6px 14px; border-radius: 20px;
  transition: all 0.2s;
}
.topnav a:hover { background: var(--green-soft); color: var(--green-dark); }

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--green) 0%, var(--green-dark) 100%);
  color: #fff;
  padding: 44px 20px 40px;
  text-align: center;
}
.hero h1 { font-size: 26px; font-weight: 700; letter-spacing: 1px; margin-bottom: 10px; }
.hero .subtitle { font-size: 15px; opacity: 0.92; max-width: 600px; margin: 0 auto; }
.tags { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-top: 18px; }
.tag {
  background: rgba(255,255,255,0.18);
  border: 1px solid rgba(255,255,255,0.3);
  padding: 5px 14px; border-radius: 20px; font-size: 13px;
}

.container { max-width: 960px; margin: 0 auto; padding: 0 16px; }

section { padding: 36px 0; }
section h2 {
  font-size: 22px; color: var(--green-dark);
  margin-bottom: 6px; display: flex; align-items: center; gap: 8px;
}
section h2 .icon { font-size: 24px; }
.section-desc { color: var(--text-soft); font-size: 14px; margin-bottom: 22px; }

/* ===== 饮食原则 ===== */
.principle-list { display: flex; flex-direction: column; gap: 10px; }
.principle {
  display: flex; align-items: center; gap: 14px;
  background: #fff; padding: 16px 18px; border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.principle .num {
  flex-shrink: 0; width: 36px; height: 36px; border-radius: 50%;
  background: var(--green); color: #fff; font-weight: 700;
  display: flex; align-items: center; justify-content: center; font-size: 15px;
}
.principle .txt { font-size: 15px; }
.principle .txt strong { color: var(--green-dark); }
.principle:nth-child(1) .num { background: var(--green-dark); }
.principle:nth-child(2) .num { background: #3d8b6f; }
.principle:nth-child(3) .num { background: #5ba888; }
.principle:nth-child(4) .num { background: #7cc2a3; }
.principle:nth-child(5) .num { background: var(--orange); }
.principle:nth-child(6) .num { background: #d97a5a; }

/* ===== 菜谱标签页 ===== */
.day-tabs {
  display: flex; gap: 8px; overflow-x: auto;
  padding-bottom: 12px; margin-bottom: 18px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.day-tab {
  flex-shrink: 0; padding: 12px 18px; border-radius: 12px;
  background: #fff; border: 2px solid transparent; cursor: pointer;
  font-size: 14px; font-weight: 600; color: var(--text-soft);
  transition: all 0.2s; white-space: nowrap;
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
  min-height: 44px; /* 触摸友好 */
}
.day-tab:hover { color: var(--green-dark); }
.day-tab.active {
  background: var(--green-soft); border-color: var(--green);
  color: var(--green-dark);
}
.day-tab .d-num { display: block; font-size: 11px; opacity: 0.6; font-weight: 400; }

.meal-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.meal {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: transform 0.2s;
}
.meal:hover { transform: translateY(-3px); }
.meal-head {
  padding: 13px 18px; color: #fff; font-weight: 600; font-size: 16px;
  display: flex; align-items: center; gap: 8px;
}
.meal.breakfast .meal-head { background: linear-gradient(135deg, #f6b26b, #e8895a); }
.meal.lunch .meal-head { background: linear-gradient(135deg, #5ba888, var(--green-dark)); }
.meal.dinner .meal-head { background: linear-gradient(135deg, #7e9bb3, #5a7790); }
.meal-body { padding: 14px 18px; }
.meal-body ul { list-style: none; display: flex; flex-wrap: wrap; gap: 6px 10px; }
.meal-body li {
  font-size: 15px; display: flex; align-items: center; gap: 6px;
  background: var(--green-light); padding: 4px 12px; border-radius: 8px;
}
.meal-body li::before { content: "•"; color: var(--green); font-weight: 700; }

.day-panel { display: none; animation: fadeIn 0.3s; }
.day-panel.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ===== 采购清单 ===== */
.shop-progress {
  background: #fff; border-radius: var(--radius); padding: 16px 18px;
  margin-bottom: 22px; box-shadow: var(--shadow);
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
}
.progress-bar { flex: 1; min-width: 160px; height: 12px; background: var(--green-soft); border-radius: 10px; overflow: hidden; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--green), var(--green-dark)); width: 0%; transition: width 0.4s; border-radius: 10px; }
.progress-text { font-size: 14px; color: var(--text-soft); font-weight: 600; white-space: nowrap; }
.reset-btn {
  background: none; border: 1px solid var(--line); color: var(--text-soft);
  padding: 6px 14px; border-radius: 20px; font-size: 13px; cursor: pointer;
  transition: all 0.2s;
}
.reset-btn:hover { border-color: var(--danger); color: var(--danger); }

.shop-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.shop-cat {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow);
}
.shop-cat-head {
  padding: 13px 18px; font-weight: 700; font-size: 16px; color: var(--green-dark);
  background: var(--green-soft); display: flex; align-items: center; gap: 8px;
}
.shop-cat-body { padding: 8px 18px 14px; }
.shop-item {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 0; cursor: pointer; font-size: 15px;
  border-bottom: 1px dashed var(--line);
  min-height: 44px; /* 触摸友好 */
}
.shop-item:last-child { border-bottom: none; }
.shop-item:hover { padding-left: 4px; }
.shop-item input[type="checkbox"] {
  appearance: none; -webkit-appearance: none;
  width: 24px; height: 24px; border: 2px solid var(--green); border-radius: 7px;
  cursor: pointer; flex-shrink: 0; position: relative;
  transition: all 0.2s;
}
.shop-item input[type="checkbox"]:checked { background: var(--green); }
.shop-item input[type="checkbox"]:checked::after {
  content: "✓"; color: #fff; position: absolute;
  top: 50%; left: 50%; transform: translate(-50%, -50%); font-size: 15px; font-weight: 700;
}
.shop-item input:checked ~ .item-label { color: #bbb; text-decoration: line-through; }
.shop-cat.note .shop-cat-head { background: var(--orange-soft); color: var(--orange); }
.shop-note {
  font-size: 13px; color: var(--text-soft); margin-top: 10px;
  line-height: 1.6; padding-top: 8px; border-top: 1px dashed var(--line);
}

/* ===== 红灯区 ===== */
.avoid-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.avoid-item {
  background: #fff; border-left: 4px solid var(--danger);
  padding: 12px 14px; border-radius: 10px; box-shadow: var(--shadow);
  font-size: 14px;
}
.avoid-item strong { display: block; color: var(--danger); margin-bottom: 2px; font-size: 15px; }
.avoid-item .reason { color: var(--text-soft); font-size: 13px; }

/* ===== 做法卡片 ===== */
.recipe-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.recipe {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: transform 0.2s;
}
.recipe:hover { transform: translateY(-3px); }
.recipe-icon { font-size: 34px; padding: 20px; text-align: center; background: var(--green-soft); }
.recipe-title { padding: 0 18px 8px; font-weight: 700; font-size: 17px; color: var(--green-dark); text-align: center; }
.recipe-steps { padding: 0 18px 18px; }
.recipe-steps .step {
  background: var(--green-light); border-radius: 10px;
  padding: 11px 14px; font-size: 14px; color: var(--text-soft);
  margin-top: 8px; line-height: 1.6;
}

/* ===== 提示框 ===== */
.callout {
  background: linear-gradient(135deg, var(--orange-soft), #fff5ee);
  border-left: 4px solid var(--orange);
  border-radius: var(--radius);
  padding: 18px 20px; margin-top: 22px; font-size: 15px;
}
.callout strong { color: var(--orange); }
.callout.uric { background: linear-gradient(135deg, #e8f0fb, #f5f9ff); border-left-color: #5a7790; }
.callout.uric strong { color: #3d5a80; }
#avoidNotes .callout { margin-top: 16px; }

footer {
  text-align: center; padding: 36px 20px;
  color: var(--text-soft); font-size: 13px;
  background: var(--green-light); border-top: 1px solid var(--line);
}
footer .disclaimer { max-width: 500px; margin: 0 auto 12px; opacity: 0.8; }

/* ===== 手机底部 tab bar ===== */
.tabbar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 200;
  height: calc(var(--tabbar-h) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--line);
  display: flex; align-items: stretch;
}
.tabbar a {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 2px;
  text-decoration: none; color: var(--text-soft);
  font-size: 11px; transition: color 0.2s;
  -webkit-tap-highlight-color: transparent;
}
.tabbar a .tb-icon { font-size: 20px; line-height: 1; }
.tabbar a .tb-label { font-size: 11px; }
.tabbar a.active { color: var(--green-dark); }
.tabbar a:active { background: var(--green-soft); }

/* ===== 加载失败提示 ===== */
.error-banner {
  position: fixed; top: 12px; left: 50%; transform: translateX(-50%);
  z-index: 300; max-width: 90%;
  background: var(--danger); color: #fff;
  padding: 14px 20px; border-radius: 12px;
  font-size: 14px; box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  line-height: 1.5;
}

/* ============================================================
   平板 (>=640px)
   ============================================================ */
@media (min-width: 640px) {
  .hero h1 { font-size: 30px; }
  .container { padding: 0 24px; }
  section { padding: 44px 0; }
  section h2 { font-size: 24px; }
  .meal-grid { grid-template-columns: repeat(3, 1fr); }
  .meal-body ul { flex-direction: column; gap: 0; }
  .meal-body li { background: none; padding: 6px 0; border-bottom: 1px dashed var(--line); border-radius: 0; width: 100%; }
  .meal-body li:last-child { border-bottom: none; }
  .shop-grid { grid-template-columns: repeat(2, 1fr); }
  .avoid-grid { grid-template-columns: repeat(3, 1fr); }
  .recipe-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================================
   桌面 (>=960px) —— 切换到顶部导航，隐藏底部 tabbar
   ============================================================ */
@media (min-width: 960px) {
  body { padding-bottom: 0; }
  .topnav { display: flex; }
  .tabbar { display: none; }
  .hero h1 { font-size: 32px; }
  .hero { padding: 56px 20px 48px; }
  section { padding: 52px 0; }
  section h2 { font-size: 26px; }
  .shop-grid { grid-template-columns: repeat(3, 1fr); }
  .recipe-grid { grid-template-columns: repeat(3, 1fr); }
  .avoid-grid { grid-template-columns: repeat(4, 1fr); }
  .principle { padding: 18px 22px; }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}