/* 城市气候身份证 · 设计 tokens 与组件（与 Claude Design 设计系统一致） */
:root {
  --paper: #F6F3EB; --card: #FFFEFA; --ink: #282216; --ink2: #6B6353; --ink3: #9B937F;
  --rule: #E6E0D0; --rule2: #D6CFBB;
  --warm: #C4451C; --warm-deep: #96320F; --warm-wash: #F6E3D8;
  --cool: #1F6FB2; --cool-wash: #DCE9F3;
  --rain: #28618C; --rain-mid: #8FB3CE; --rain-wash: #E3EDF5;
  --neutral: #918A76;
  --caution-bg: #F6EDD4; --caution-ink: #7C6120;
  --serif: "Noto Serif SC", "Songti SC", "STSong", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
html { -webkit-text-size-adjust: 100%; }
body { background: #ECE8DD; font-family: var(--sans); color: var(--ink); -webkit-font-smoothing: antialiased; }
.app { max-width: 430px; min-height: 100vh; margin: 0 auto; background: var(--paper); position: relative; }
@media (min-width: 431px) { .app { box-shadow: 0 0 0 1px var(--rule2); } }

a { color: inherit; }
.lbl { font: 600 10px/1.5 var(--sans); letter-spacing: .18em; color: var(--ink3); }
.serif { font-family: var(--serif); }
.num { font-variant-numeric: tabular-nums; }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 7px; height: 46px; padding: 0 22px;
  border-radius: 9px; font: 600 15px var(--sans); border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  text-decoration: none; transition: opacity .14s; }
.btn:active { opacity: .82; }
.btn-primary { background: var(--ink); color: #FBF9F3; }
.btn-outline { background: transparent; border-color: var(--rule2); color: var(--ink); }
.btn-warm { background: var(--warm); color: #FFF7F2; }
.btn-sm { height: 34px; padding: 0 14px; font-size: 13px; border-radius: 7px; }
.btn-text { background: none; border: none; height: auto; padding: 0; color: var(--warm); font: 600 13px var(--sans); cursor: pointer; }
.btn[disabled] { opacity: .4; pointer-events: none; }

/* chip 与分段控件 */
.chip { display: inline-flex; align-items: center; gap: 6px; height: 34px; padding: 0 14px; border-radius: 17px;
  border: 1px solid var(--rule2); background: var(--card); font: 500 13px var(--sans); color: var(--ink2); cursor: pointer;
  white-space: nowrap; transition: all .14s; }
.chip.on { border-color: var(--ink); background: var(--ink); color: #FBF9F3; font-weight: 600; }
.chip.add { border-style: dashed; color: var(--ink3); }
.chip[disabled], .chip.off { opacity: .45; pointer-events: none; }
.seg { display: flex; background: #EBE6D7; border-radius: 9px; padding: 3px; gap: 2px; overflow-x: auto; scrollbar-width: none; }
.seg::-webkit-scrollbar { display: none; }
.seg button { flex: 1 0 auto; height: 30px; border: none; background: transparent; border-radius: 7px;
  font: 500 12px var(--sans); color: var(--ink2); white-space: nowrap; padding: 0 12px; cursor: pointer; }
.seg .on { background: var(--card); color: var(--ink); font-weight: 600; box-shadow: 0 1px 2px rgba(40,34,22,.14); }

/* 卡片与数字 */
.card { background: var(--card); border: 1px solid var(--rule); border-radius: 12px; padding: 16px; }
.stat-value { font: 700 26px/1.05 var(--serif); font-variant-numeric: tabular-nums; letter-spacing: -.01em; }
.stat-unit { font: 600 13px var(--serif); color: var(--ink2); margin-left: 2px; }
.stat-delta { font: 500 11px/1.5 var(--sans); color: var(--ink2); margin-top: 5px; }
.hero-value { font: 800 46px/1 var(--serif); font-variant-numeric: tabular-nums; letter-spacing: -.015em; }
.badge { display: inline-flex; align-items: baseline; padding: 4px 9px; border-radius: 6px;
  font: 700 13px var(--serif); font-variant-numeric: tabular-nums; }
.badge-warm { background: var(--warm-wash); color: var(--warm-deep); }
.badge-cool { background: var(--cool-wash); color: #1B5A8C; }
.badge-neutral { background: #ECE8DC; color: var(--ink2); }

/* 顶栏 */
.topbar { display: flex; align-items: center; gap: 10px; height: 48px; padding: 0 16px; border-bottom: 1px solid var(--rule);
  position: sticky; top: 0; background: var(--paper); z-index: 20; }
.topbar .back { font: 400 20px/1 var(--sans); color: var(--ink2); text-decoration: none; padding: 4px 8px 4px 0; }
.topbar .t { font: 600 14px var(--sans); }
.topbar .r { margin-left: auto; font: 500 13px var(--sans); color: var(--warm); text-decoration: none; cursor: pointer; }

/* 图表卡 */
.chart-card { background: var(--card); border: 1px solid var(--rule); border-radius: 12px; padding: 16px 14px 12px; }
.chart-head { display: flex; align-items: baseline; justify-content: space-between; padding: 0 2px; gap: 10px; }
.chart-title { font: 700 16px/1.3 var(--serif); }
.chart-sub { font: 400 11px var(--sans); color: var(--ink3); margin-top: 3px; }
.chart-box svg { display: block; width: 100%; height: auto; touch-action: pan-y; }
.legend { display: flex; gap: 14px; margin: 10px 2px 2px; font: 500 10.5px var(--sans); color: var(--ink2); flex-wrap: wrap; }
.legend i { display: inline-block; width: 16px; height: 0; border-top: 2.5px solid; vertical-align: middle; margin-right: 5px; border-radius: 2px; }
.legend i.thin { border-top-width: 1.5px; }
.legend i.dash { border-top-style: dashed; border-top-width: 1.5px; }
.legend i.bar { height: 9px; border: none; width: 9px; border-radius: 2px; }
.chart-note { font: 400 12px/1.7 var(--sans); color: var(--ink2); border-top: 1px solid var(--rule); padding: 10px 2px 2px; margin-top: 10px; }
.chart-foot { font: 400 10px var(--sans); color: var(--ink3); margin-top: 8px; padding: 0 2px; }

/* 提示与免责 */
.note-caution { background: var(--caution-bg); color: var(--caution-ink); border-radius: 9px; padding: 11px 13px; font: 400 11.5px/1.7 var(--sans); }
.disclaimer { padding: 16px 20px 26px; font: 400 10.5px/1.8 var(--sans); color: var(--ink3); border-top: 1px solid var(--rule); }
.ai-tag { display: inline-flex; align-items: center; padding: 3px 8px; border-radius: 5px; background: #ECE8DC;
  color: var(--ink2); font: 600 10px var(--sans); letter-spacing: .06em; white-space: nowrap; }

/* 城市行 */
.city-row { display: flex; align-items: center; gap: 12px; padding: 15px 2px; border-bottom: 1px solid var(--rule);
  cursor: pointer; text-decoration: none; color: var(--ink); }
.city-row:last-child { border-bottom: none; }
.city-name { font: 600 17px/1.3 var(--serif); }
.city-meta { font: 400 11px/1.5 var(--sans); color: var(--ink3); margin-top: 2px; }

/* 底部弹层 */
.sheet-mask { position: fixed; inset: 0; background: rgba(40,34,22,.45); z-index: 50; display: flex; align-items: flex-end;
  justify-content: center; opacity: 0; pointer-events: none; transition: opacity .18s; }
.sheet-mask.open { opacity: 1; pointer-events: auto; }
.sheet { background: var(--card); border-radius: 16px 16px 0 0; padding: 20px 20px calc(26px + env(safe-area-inset-bottom));
  width: 100%; max-width: 430px; transform: translateY(24px); transition: transform .18s; }
.sheet-mask.open .sheet { transform: none; }
.sheet-grip { width: 36px; height: 4px; border-radius: 2px; background: var(--rule2); margin: 0 auto 16px; }
.sheet-def { margin-top: 12px; padding: 12px 14px; background: var(--paper); border-radius: 9px; font: 400 13px/1.8 var(--sans); }

/* toast 与骨架 */
.toast { position: fixed; left: 50%; bottom: 60px; transform: translateX(-50%); background: var(--ink); color: #FBF9F3;
  font: 500 12px var(--sans); padding: 9px 18px; border-radius: 20px; z-index: 80; opacity: 0; transition: opacity .2s; pointer-events: none;
  max-width: 80vw; text-align: center; }
.toast.show { opacity: 1; }
.skeleton { border-radius: 12px; background: linear-gradient(100deg, #EFEBDF 40%, #F7F4EC 50%, #EFEBDF 60%); background-size: 200% 100%;
  animation: sk 1.2s infinite linear; }
@keyframes sk { to { background-position: -200% 0; } }

/* 错误态 */
.error-card { text-align: center; padding: 28px 20px; }
.error-card h3 { font: 700 15px var(--serif); }
.error-card p { font: 400 12.5px/1.8 var(--sans); color: var(--ink2); margin-top: 8px; }

input.search { width: 100%; height: 44px; padding: 0 14px 0 36px; background: var(--card) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 14 14'%3E%3Ccircle cx='6' cy='6' r='4.6' fill='none' stroke='%239B937F' stroke-width='1.6'/%3E%3Cline x1='9.6' y1='9.6' x2='13' y2='13' stroke='%239B937F' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E") 13px center no-repeat;
  border: 1px solid var(--rule2); border-radius: 10px; font: 400 14px var(--sans); color: var(--ink); outline: none; }
input.search::placeholder { color: var(--ink3); }
input.search:focus { border-color: var(--ink3); }