:root{
    --bg:#f5f5f7; --side:#fbfbfd; --card:#ffffff; --ink:#1d1d1f; --muted:#6e6e73; --faint:#8e8e93;
    --line:rgba(60,60,67,.12); --hair:rgba(60,60,67,.18); --grid:rgba(60,60,67,.05); --primary:#007aff; --primary-soft:#e8f1ff; --green:#34c759; --green-soft:#e7f8ec;
    --field:#ffffff; --seg:#e8e8ed;
    --radius:18px; --shadow:0 1px 2px rgba(0,0,0,.04),0 10px 30px rgba(0,0,0,.06);
  }
  html[data-theme="dark"]{
    --bg:#000000; --side:#1c1c1e; --card:#1c1c1e; --ink:#f5f5f7; --muted:#98989d; --faint:#636366;
    --line:rgba(84,84,88,.36); --hair:rgba(84,84,88,.5); --grid:rgba(255,255,255,.045); --primary:#0a84ff; --primary-soft:#0a2a4d; --green:#30d158; --green-soft:#0c3320;
    --field:#2c2c2e; --seg:#3a3a3c;
    --shadow:0 1px 2px rgba(0,0,0,.5),0 10px 30px rgba(0,0,0,.5);
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html,body{height:100%}
  body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","Helvetica Neue",Arial,sans-serif;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;font-size:14px;transition:background .3s,color .3s}
  .app{display:flex;flex-direction:column;height:100vh;overflow:hidden}

  .topbar{height:56px;flex-shrink:0;background:rgba(251,251,253,.8);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 22px;z-index:10}
  html[data-theme="dark"] .topbar{background:rgba(28,28,30,.8)}
  .brand{display:flex;align-items:center;gap:12px;min-width:0}
  .brand .logo-img{height:30px;width:auto;display:block}
  .brand .logo-fallback{width:32px;height:32px;border-radius:8px;background:var(--primary);display:none;align-items:center;justify-content:center;flex-shrink:0}
  .brand .logo-fallback svg{width:19px;height:19px;stroke:#fff;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
  .brand .t{font-size:17px;font-weight:600;letter-spacing:-.01em;white-space:nowrap}
  .brand .s{font-size:11.5px;color:var(--faint);font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .top-right{display:flex;align-items:center;gap:8px;flex-shrink:0}
  .date{font-size:13px;color:var(--muted);font-weight:500;white-space:nowrap}
  .top-tool,.theme-btn{width:38px;height:38px;border-radius:50%;border:none;background:transparent;cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--muted);transition:background .15s,color .15s;text-decoration:none}
  .top-tool:hover,.theme-btn:hover{background:rgba(120,120,128,.12);color:var(--ink)}
  .top-tool svg,.theme-btn svg{width:19px;height:19px;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}

  .body{display:flex;flex:1;overflow:hidden}
  .sidebar{width:216px;background:var(--side);border-right:1px solid var(--line);display:flex;flex-direction:column;flex-shrink:0}
  .nav{flex:1;overflow-y:auto;padding:16px 12px}
  .sec{font-size:11px;font-weight:600;color:var(--faint);letter-spacing:.04em;padding:4px 12px 8px}
  .nav button{display:flex;align-items:center;gap:11px;width:100%;border:none;background:transparent;padding:9px 12px;border-radius:9px;font-size:13.5px;font-weight:500;color:var(--muted);cursor:pointer;font-family:inherit;text-align:left;transition:background .15s,color .15s;margin-bottom:2px}
  .nav button svg{width:18px;height:18px;flex-shrink:0;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
  .nav button:hover{background:rgba(120,120,128,.12);color:var(--ink)}
  .nav button.active{background:var(--primary-soft);color:var(--primary);font-weight:600}
  .side-foot{padding:14px 18px;font-size:11px;color:var(--faint);border-top:1px solid var(--line);line-height:1.6}

  .main{flex:1;display:flex;flex-direction:column;overflow:hidden}
  .stage{flex:1;overflow-y:auto;padding:24px}
  .tool{display:none}
  .tool.active{display:block;animation:fade .25s ease}
  @keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

  .calc{display:grid;grid-template-columns:430px 1fr;gap:20px;align-items:start}
  @media (max-width:1080px){.calc{grid-template-columns:1fr}}

  .panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}
  .panel h3{font-size:13px;font-weight:600;color:var(--ink);margin:0 0 14px}
  .panel h3.mt{margin-top:24px}
  .panel h3 .tag{font-size:11px;font-weight:500;color:var(--primary);background:var(--primary-soft);padding:2px 8px;border-radius:999px;margin-left:6px}
  .field{margin-bottom:15px}
  .field label{display:flex;justify-content:space-between;align-items:baseline;font-size:12.5px;color:var(--muted);margin-bottom:7px;font-weight:500}
  .field label .hint{font-size:11px;color:var(--faint)}
  .input-wrap{position:relative;display:flex;align-items:center}
  .input-wrap .unit{position:absolute;right:13px;font-size:13px;color:var(--faint);pointer-events:none;font-weight:500}
  .input-wrap input{width:100%;padding:10px 40px 10px 13px;border:1px solid var(--hair);border-radius:10px;font-size:15px;font-weight:600;color:var(--ink);background:var(--field);outline:none;transition:.15s;font-family:inherit}
  .input-wrap input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}
  .input-wrap input:disabled{opacity:.5}
  .input-wrap input::-webkit-outer-spin-button,.input-wrap input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
  .row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
  .tabs{display:grid;gap:3px;background:var(--seg);border-radius:10px;padding:3px}
  .tabs.c2{grid-template-columns:1fr 1fr}.tabs.c3{grid-template-columns:repeat(3,1fr)}
  .tabs button{border:none;background:transparent;padding:8px 6px;border-radius:8px;font-size:13px;font-weight:500;color:var(--muted);cursor:pointer;transition:.15s;font-family:inherit}
  .tabs button.active{background:var(--card);color:var(--ink);font-weight:600;box-shadow:0 1px 3px rgba(0,0,0,.12)}
  .slider{width:100%;height:4px;-webkit-appearance:none;background:var(--hair);border-radius:999px;margin-top:10px;outline:none}
  .slider::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:var(--primary);cursor:pointer;box-shadow:0 1px 4px rgba(0,122,255,.4);border:3px solid #fff}
  .slider::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:var(--primary);cursor:pointer;border:3px solid #fff}
  .chk{display:flex;align-items:center;gap:9px;font-size:13px;color:var(--ink);cursor:pointer;user-select:none;font-weight:500}
  .field label.chk{justify-content:flex-start;align-items:center}
  .chk input{width:17px;height:17px;accent-color:var(--primary);cursor:pointer}
  select{border:1px solid var(--hair);border-radius:10px;padding:10px 13px;font-size:14px;font-weight:600;color:var(--ink);background:var(--field);outline:none;font-family:inherit;width:100%}
  .hidden{display:none!important}

  .show{display:flex;flex-direction:column;gap:16px}
  .toprow{display:grid;grid-template-columns:1fr 1fr;gap:14px}
  @media (max-width:560px){.toprow{grid-template-columns:1fr}}
  .stat{position:relative;overflow:hidden;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px}
  .stat.primary{background:var(--primary);border-color:transparent;color:#fff}
  .stat.countdown{background:var(--green);border-color:transparent;color:#fff}
  .stat .k{font-size:12.5px;font-weight:500;opacity:.9}
  .stat .v{font-size:30px;font-weight:700;margin-top:6px;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
  .stat .v small{font-size:14px;font-weight:500;opacity:.9}
  .stat .sub{font-size:12px;opacity:.85;margin-top:5px;font-weight:500}
  .stat-deco{position:absolute;right:-4px;bottom:-10px;width:92px;height:92px;opacity:.28;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;pointer-events:none;z-index:2}
  .stat:not(.primary):not(.countdown) .stat-deco{stroke:var(--primary);opacity:.3}
  /* 大色块卡片极淡网格背景 */
  .stat{background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:24px 24px}
  .stat.primary,.stat.countdown{background-image:linear-gradient(rgba(255,255,255,.09) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.09) 1px,transparent 1px);background-size:24px 24px}
  .card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 22px}
  .card h4{font-size:15px;font-weight:600;margin-bottom:15px}
  .pill{font-size:11px;font-weight:600;color:var(--primary);background:var(--primary-soft);padding:3px 9px;border-radius:999px}
  table{width:100%;border-collapse:collapse}
  th,td{padding:10px 14px 10px 0;border-bottom:1px solid var(--line);font-size:13.5px;vertical-align:top;text-align:left}
  th{font-size:12px;font-weight:600;color:var(--muted)}
  th.num,td.num{text-align:right;font-variant-numeric:tabular-nums;font-weight:600}
  tr:last-child td{border-bottom:none}
  td:first-child{color:var(--muted)}
  td:last-child{text-align:right;font-weight:600;font-variant-numeric:tabular-nums}
  td .f{font-size:11px;color:var(--faint);font-weight:400;display:block;margin-top:2px}
  .bar{display:flex;height:12px;border-radius:7px;overflow:hidden;background:var(--seg);margin:6px 0 13px}
  .bar span{height:100%;transition:width .3s}
  .legend{display:flex;flex-wrap:wrap;gap:13px;font-size:12px;color:var(--muted)}
  .legend span{display:flex;align-items:center;gap:5px}
  .legend i{width:9px;height:9px;border-radius:3px;display:inline-block}
  .note{font-size:11.5px;color:var(--faint);line-height:1.7;margin-top:11px}
  .formula-box{background:var(--seg);border-radius:12px;padding:14px 16px;font-size:12px;color:var(--muted);line-height:1.95;margin-top:8px}
  .formula-box b{color:var(--ink);font-weight:600}
  .about-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:16px}
  .about-card .about-head{display:flex;align-items:center;gap:9px;font-size:15px;font-weight:600;margin-bottom:12px}
  .about-card .about-head svg{width:20px;height:20px;stroke:var(--primary);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}
  .about-card .about-foot{font-size:11.5px;color:var(--faint);margin-top:10px;line-height:1.6}
  .months-strip{display:flex;flex-wrap:wrap;gap:10px}
  .months-strip span{background:var(--seg);border-radius:9px;padding:7px 13px;font-size:13px;font-weight:600;color:var(--ink);font-variant-numeric:tabular-nums}

  /* 使用说明新增 */
  .sec-title{font-size:17px;font-weight:600;color:var(--ink);margin:28px 0 13px;display:flex;align-items:center;gap:9px}
  .sec-title::before{content:"";width:4px;height:17px;border-radius:3px;background:var(--primary);display:inline-block}
  .howto-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
  .howto-card .ht-head{display:flex;align-items:center;gap:9px;font-size:15px;font-weight:600;margin-bottom:12px}
  .howto-card .ht-head svg{width:20px;height:20px;stroke:var(--primary);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}
  .ht-steps{margin:0;padding-left:18px;font-size:13px;color:var(--muted);line-height:1.85}
  .ht-steps li{margin-bottom:5px}
  .ht-steps li::marker{color:var(--primary);font-weight:600}
  .prose{font-size:13px;color:var(--muted);line-height:1.85;margin:0 0 10px}
  .prose b{color:var(--ink);font-weight:600}
  .prose-list{margin:0;padding-left:18px;font-size:13px;color:var(--muted);line-height:1.85}
  .prose-list li{margin-bottom:7px}
  .prose-list li b{color:var(--ink);font-weight:600}
  .entry-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
  .entry-card{display:block;text-decoration:none;color:inherit;transition:transform .12s,box-shadow .12s,border-color .12s}
  .entry-card:hover{transform:translateY(-2px);border-color:var(--primary);box-shadow:0 6px 20px rgba(0,0,0,.08)}
  .entry-card .ec-head{font-size:14.5px;font-weight:600;color:var(--ink)}
  .entry-card .ec-url{font-size:11.5px;color:var(--primary);margin:4px 0 8px;word-break:break-all}
  .entry-card .ec-desc{font-size:12px;color:var(--muted);line-height:1.6}
  .region-table.mini th,.region-table.mini td{padding:9px 12px;font-size:12.5px}
  .card-stack{display:flex;flex-direction:column;gap:16px}

  /* 各省政务入口折叠列表 */
  .prov-details{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;margin-top:14px}
  .prov-details>summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:10px;padding:15px 18px;font-size:14.5px;font-weight:600;color:var(--ink);user-select:none}
  .prov-details>summary::-webkit-details-marker{display:none}
  .prov-details .pd-chev{width:17px;height:17px;stroke:var(--primary);fill:none;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round;transition:transform .2s;flex-shrink:0}
  .prov-details[open]>summary .pd-chev{transform:rotate(90deg)}
  .prov-details .pd-count{margin-left:auto;font-size:11.5px;font-weight:400;color:var(--faint)}
  .prov-list{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border-top:1px solid var(--line)}
  .prov-item{background:var(--card);padding:11px 16px;display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:13px}
  .prov-item b{color:var(--ink);font-weight:600;flex-shrink:0}
  .prov-item span{color:var(--muted);text-align:right;font-size:12.5px}

  .region-table{width:100%;border-collapse:separate;border-spacing:0;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
  .region-table th,.region-table td{padding:12px 16px;font-size:13.5px;border-bottom:1px solid var(--line);vertical-align:middle}
  .region-table th{background:var(--seg);font-weight:600;color:var(--muted);text-align:left}
  .region-table th.num,.region-table td.num{text-align:right;font-variant-numeric:tabular-nums;font-weight:600}
  .region-table tr:last-child td{border-bottom:none}
  .region-table tbody tr{cursor:pointer;transition:background .12s}
  .region-table tbody tr:hover{background:rgba(0,122,255,.06)}
  .use-btn{width:30px;height:30px;border-radius:50%;border:none;background:transparent;color:var(--primary);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:color .15s,background .15s}
  .use-btn:hover{background:rgba(0,122,255,.1)}
  .use-btn svg{width:17px;height:17px;stroke:currentColor;fill:none;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}

  @media (max-width:768px){
    .body{flex-direction:column}
    .sidebar{width:100%;flex-direction:row;border-right:none;border-bottom:1px solid var(--line);flex-shrink:0}
    .nav{display:flex;flex-direction:row;padding:6px 4px;overflow:visible}
    .nav button{flex:1;flex-direction:column;align-items:center;justify-content:center;gap:3px;margin:0;padding:8px 2px;font-size:10.5px;font-weight:500;white-space:nowrap;text-align:center;border-radius:9px}
    .nav button svg{width:20px;height:20px}
    .sec,.side-foot{display:none}
    .topbar{padding:0 12px}
    .brand .s{display:none}
    .date{display:none}
    .stage{padding:14px}
    .calc{gap:14px}
    .panel{padding:16px}
    .about-grid{grid-template-columns:1fr}
    .howto-grid{grid-template-columns:1fr}
    .entry-grid{grid-template-columns:1fr}
    .prov-list{grid-template-columns:repeat(2,1fr)}
  }

  /* 首次说明 tooltip */
  .first-tip{display:flex;align-items:flex-start;gap:12px;grid-column:1 / -1;background:var(--primary-soft);border:1px solid rgba(0,122,255,.25);border-radius:14px;padding:14px 38px 14px 16px;margin-bottom:16px;position:relative}
  .first-tip .ft-body{font-size:12.5px;color:var(--ink);line-height:1.7}
  .first-tip .ft-body strong{color:var(--primary)}
  .first-tip .ft-close{position:absolute;top:6px;right:8px;width:26px;height:26px;border:none;background:transparent;font-size:20px;line-height:1;color:var(--muted);cursor:pointer;border-radius:50%}
  .first-tip .ft-close:hover{background:rgba(120,120,128,.15)}

  /* 保存方案 */
  .save-btn{width:100%;margin-top:6px;border:1px dashed var(--primary);background:transparent;color:var(--primary);font-weight:600;font-size:13px;padding:11px;border-radius:11px;cursor:pointer;font-family:inherit;transition:.15s}
  .save-btn:hover{background:var(--primary-soft)}
  .plan-row{display:flex;align-items:center;gap:12px;padding:11px 0;border-bottom:1px solid var(--line)}
  .plan-row:last-child{border-bottom:none}
  .plan-name{font-size:13.5px;font-weight:600;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .plan-val{font-size:14px;font-weight:700;color:var(--primary);font-variant-numeric:tabular-nums}
  .plan-act{display:flex;gap:6px;flex-shrink:0}
  .mini{border:1px solid var(--hair);background:var(--field);color:var(--ink);font-size:12px;font-weight:500;padding:6px 11px;border-radius:8px;cursor:pointer;font-family:inherit;transition:.15s}
  .mini:hover{background:rgba(120,120,128,.12)}
  .mini.danger{color:#ff3b30;border-color:rgba(255,59,48,.3)}
  .mini.danger:hover{background:rgba(255,59,48,.1)}

  /* 替代率参考带 */
  .rep-track{position:relative;height:16px;border-radius:9px;background:var(--seg);margin:6px 0 2px}
  .rep-fill{position:absolute;left:0;top:0;height:100%;border-radius:9px;transition:width .3s,background .3s;min-width:2px}
  .rep-mark{position:absolute;top:-21px;transform:translateX(-50%);font-size:10.5px;font-weight:600;color:var(--muted)}
  .rep-mark::after{content:"";position:absolute;left:50%;top:17px;width:1px;height:6px;background:var(--hair)}
  .rep-mark.lo{color:#ff9f0a}.rep-mark.hi{color:var(--green)}

  /* 城乡多缴多补高亮 */
  .region-table tr.cur{background:rgba(0,122,255,.1);font-weight:600}
  table tr.cur{background:rgba(255,159,10,.14)}
  table tr.cur td{font-weight:600}

  /* 关键年龄测算表 */
  #cmpTable{border:1px solid var(--line);border-radius:12px;overflow:auto;max-height:340px}
  #cmpTable th{background:var(--seg);padding:11px 13px}
  #cmpTable td{padding:11px 13px}
  #cmpTable tr.key{background:rgba(0,122,255,.07)}
  #cmpTable tr:last-child td{border-bottom:none}

  /* 对比图悬停提示 */
  .cmp-wrap{position:relative}
  .chart-tip{position:absolute;display:none;pointer-events:none;z-index:5;background:var(--ink);color:var(--bg);font-size:11.5px;line-height:1.55;padding:7px 10px;border-radius:9px;white-space:nowrap;box-shadow:0 6px 18px rgba(0,0,0,.22);transform:translate(-50%,-118%)}
  .chart-tip b{font-weight:700}

  /* 移动端底部 Dock 导航 */
  @media (max-width:768px){
    .body{flex-direction:column}
    .sidebar{position:fixed;bottom:0;left:0;right:0;top:auto;width:auto;flex-direction:row;border:none;border-top:1px solid var(--line);background:rgba(251,251,253,.92);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);z-index:30;padding:6px 4px;box-shadow:0 -1px 12px rgba(0,0,0,.08)}
    html[data-theme="dark"] .sidebar{background:rgba(28,28,30,.92)}
    .nav{display:flex;flex-direction:row;padding:0;overflow:visible;flex:1}
    .nav button{flex:1;flex-direction:column;align-items:center;justify-content:center;gap:3px;margin:0;padding:7px 2px;font-size:10px;font-weight:500;white-space:nowrap;text-align:center;border-radius:10px}
    .nav button svg{width:21px;height:21px}
    .nav button.active{background:var(--primary-soft);color:var(--primary);font-weight:600}
    .sec,.side-foot{display:none}
    .topbar{padding:0 12px}
    .brand .s{display:none}
    .date{display:none}
    .main{padding-bottom:66px}
    .stage{padding:14px 14px 20px}
    .calc{gap:14px}
    .panel{padding:16px}
    .about-grid{grid-template-columns:1fr}
    .howto-grid{grid-template-columns:1fr}
    .entry-grid{grid-template-columns:1fr}
    .prov-list{grid-template-columns:repeat(2,1fr)}
  }