:root{
    --ink:#171816;
    --muted:#646761;
    --paper:#f7f4ee;
    --surface:#fffdf8;
    --line:#dfd8cc;
    --teal:#0e766e;
    --teal-dark:#07544f;
    --coral:#cf563d;
    --gold:#c99946;
    --graphite:#2f3331;
  }
  *{margin:0;padding:0;box-sizing:border-box;}
  body{
    background:#e9e4da;
    font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;
    color:var(--ink);
    -webkit-font-smoothing:antialiased;
    padding:28px 12px;
  }
  .poster{
    width:760px;
    margin:0 auto;
    background:var(--paper);
    border-radius:18px;
    overflow:hidden;
    box-shadow:0 24px 60px rgba(23,24,22,.22);
  }

  /* ===== HERO ===== */
  .hero{
    position:relative;
    background:linear-gradient(150deg,#2f3331 0%,#07544f 100%);
    color:#fffdf8;
    padding:54px 46px 46px;
    overflow:hidden;
  }
  .hero::before{
    content:"";
    position:absolute;inset:0;
    background:repeating-linear-gradient(180deg,rgba(255,253,248,.05) 0 1px,transparent 1px 26px);
    opacity:.5;
  }
  .hero::after{
    content:"\266B";
    position:absolute;
    right:-20px;top:-30px;
    font-size:240px;
    color:rgba(201,153,70,.16);
    line-height:1;
  }
  .hero-inner{position:relative;z-index:2;}
  .chip{
    display:inline-block;
    background:rgba(201,153,70,.18);
    border:1px solid rgba(201,153,70,.5);
    color:var(--gold);
    font-size:13px;letter-spacing:2px;
    padding:7px 16px;border-radius:30px;
    margin-bottom:22px;
  }
  .hero h1{
    font-size:42px;line-height:1.28;font-weight:800;
    letter-spacing:1px;
    margin-bottom:18px;
  }
  .hero h1 .hl{color:var(--gold);}
  .hero p.sub{
    font-size:16px;line-height:1.8;color:rgba(255,253,248,.82);
    max-width:560px;
  }
  .hero .strokes{margin-top:26px;display:flex;gap:14px;flex-wrap:wrap;}
  .stroke{
    background:rgba(255,253,248,.08);
    border:1px solid rgba(255,253,248,.18);
    border-radius:10px;padding:10px 16px;font-size:13.5px;
    color:rgba(255,253,248,.9);
  }
  .stroke b{color:var(--gold);font-weight:700;}

  /* ===== SECTION HEADER ===== */
  .sec-head{
    display:flex;align-items:center;gap:14px;
    padding:0 46px;margin-top:44px;
  }
.sec-bar{width:6px;height:30px;border-radius:4px;background:var(--coral);}
.sec-bar-teal{background:var(--teal);}
.sec-bar-gold{background:var(--gold);}
  .sec-head h2{font-size:23px;font-weight:800;letter-spacing:1px;color:var(--ink);}
  .sec-head .en{font-size:12px;color:var(--muted);letter-spacing:1px;margin-left:auto;}

  .pad{padding:0 46px;}

  /* ===== PROBLEM ===== */
  .prob-intro{margin:18px 46px 0;font-size:15px;color:var(--muted);line-height:1.7;}
  .prob-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;padding:18px 46px 0;}
  .pcard{
    background:var(--surface);
    border:1px solid var(--line);
    border-left:4px solid var(--coral);
    border-radius:12px;padding:16px 18px;
  }
  .pcard .q{font-size:14.5px;font-weight:700;color:var(--ink);line-height:1.5;margin-bottom:6px;}
  .pcard .a{font-size:13px;color:var(--muted);line-height:1.6;}

  /* ===== NARRATIVE / MAP ===== */
  .map-wrap{
    margin:18px 46px 0;
    background:linear-gradient(135deg,#07544f,#0e766e);
    border-radius:16px;padding:30px 32px;color:#fffdf8;position:relative;overflow:hidden;
  }
  .map-wrap::after{content:"\266A";position:absolute;right:-10px;bottom:-30px;font-size:150px;color:rgba(255,253,248,.07);}
  .map-wrap h3{font-size:20px;font-weight:800;margin-bottom:10px;color:#fffdf8;}
  .map-wrap .lead{font-size:14px;line-height:1.85;color:rgba(255,253,248,.88);margin-bottom:20px;}
  .layers{display:grid;grid-template-columns:1fr 1fr;gap:12px;}
  .layer{background:rgba(255,253,248,.1);border:1px solid rgba(255,253,248,.18);border-radius:10px;padding:12px 14px;}
  .layer b{color:var(--gold);font-size:14px;}
  .layer span{display:block;font-size:12.5px;color:rgba(255,253,248,.82);margin-top:4px;line-height:1.5;}

  .abilities{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;padding:18px 46px 0;}
  .ability{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px 12px;text-align:center;}
  .ability .num{font-size:22px;font-weight:800;color:var(--teal);}
  .ability .nm{font-size:14px;font-weight:700;margin:6px 0 4px;}
  .ability .ds{font-size:11.5px;color:var(--muted);line-height:1.5;}

  /* ===== CURRICULUM ===== */
  .days{padding:18px 46px 0;position:relative;}
  .day{display:flex;gap:16px;padding:14px 0;border-bottom:1px dashed var(--line);}
  .day:last-child{border-bottom:none;}
  .day .dno{
    flex:0 0 64px;height:64px;border-radius:12px;
    background:var(--surface);border:2px solid var(--teal);
    color:var(--teal);font-weight:800;font-size:13px;
    display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1.2;
  }
  .day .dno b{font-size:22px;}
  .day .dbody{padding-top:4px;}
  .day .dbody h4{font-size:16px;font-weight:800;color:var(--ink);margin-bottom:4px;}
  .day .dbody p{font-size:13px;color:var(--muted);line-height:1.6;}

  /* ===== TRANSFORMATION ===== */
  .trans{
    margin:18px 46px 0;
    background:linear-gradient(135deg,#fffdf8,#f3ede2);
    border:1px solid var(--line);border-radius:16px;padding:30px 32px;
  }
  .trans .tt{text-align:center;margin-bottom:8px;}
  .trans .tt .big{font-size:24px;font-weight:800;color:var(--teal-dark);}
  .trans .tt .small{font-size:13px;color:var(--muted);margin-top:6px;}
  .becomes{margin-top:20px;display:grid;grid-template-columns:1fr 1fr;gap:14px;}
  .bec{display:flex;gap:12px;align-items:flex-start;}
  .bec .ic{
    flex:0 0 38px;height:38px;border-radius:50%;background:var(--teal);color:#fff;
    display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:800;
  }
  .bec .tx b{font-size:14.5px;color:var(--ink);display:block;margin-bottom:3px;}
  .bec .tx span{font-size:12.5px;color:var(--muted);line-height:1.6;}
  .bec-final{
    margin-top:18px;text-align:center;font-size:15px;font-weight:700;color:var(--coral);
    background:rgba(207,86,61,.07);border:1px dashed rgba(207,86,61,.4);
    border-radius:12px;padding:14px;line-height:1.7;
  }

  /* ===== METHOD ===== */
  .method{padding:18px 46px 0;}
  .method .box{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:22px 24px;}
  .method .box h4{font-size:15px;font-weight:800;color:var(--ink);margin-bottom:12px;}
  .steps{display:flex;flex-wrap:wrap;gap:8px;}
  .step{background:rgba(14,118,110,.08);border:1px solid rgba(14,118,110,.25);border-radius:8px;padding:7px 12px;font-size:12.5px;color:var(--teal-dark);font-weight:600;}
  .method .note{margin-top:14px;font-size:13px;color:var(--muted);line-height:1.7;}

  /* ===== PRICE / CTA ===== */
  .price{
    margin:42px 46px 0;
    background:linear-gradient(135deg,var(--coral),#b8452f);
    border-radius:18px;padding:34px 36px;color:#fff;position:relative;overflow:hidden;
  }
  .price::after{content:"\266B";position:absolute;right:-10px;bottom:-36px;font-size:170px;color:rgba(255,255,255,.1);}
  .price .ph{font-size:14px;letter-spacing:2px;opacity:.9;margin-bottom:6px;}
  .price .pbig{font-size:46px;font-weight:900;line-height:1;}
  .price .pbig .cur{font-size:24px;vertical-align:top;margin-right:2px;}
  .price .pold{font-size:15px;opacity:.85;margin-left:14px;text-decoration:line-through;}
  .price .deal{
    display:inline-block;margin-top:16px;background:rgba(255,255,255,.16);
    border:1px solid rgba(255,255,255,.35);border-radius:30px;padding:8px 18px;font-size:13.5px;font-weight:700;
  }
  .cta{
    display:block;width:100%;margin-top:22px;text-align:center;
    background:#fff;color:var(--coral);font-size:19px;font-weight:800;
    border:none;border-radius:12px;padding:17px;letter-spacing:2px;cursor:pointer;
    box-shadow:0 10px 24px rgba(0,0,0,.18);
  }
  .price .foot{margin-top:14px;font-size:12.5px;opacity:.85;text-align:center;}

  /* ===== FOOTER ===== */
  .foot-note{padding:26px 46px 40px;font-size:12px;color:var(--muted);line-height:1.8;text-align:center;}
  .foot-note .line{height:1px;background:var(--line);margin:0 0 20px;}

  /* ===== GROUP QR ===== */
  .group-qr{
    margin:18px 46px 0;
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:16px;
    padding:26px 30px;
    text-align:center;
  }
  .group-qr .gq-title{
    font-size:20px;font-weight:800;color:var(--teal-dark);
    letter-spacing:1px;margin-bottom:6px;
  }
  .group-qr .gq-sub{
    font-size:13.5px;color:var(--muted);margin-bottom:18px;
  }
  .group-qr .gq-img-wrap{
    display:inline-block;
    width:200px;
    background:#fff;
    border:1px solid var(--line);
    border-radius:12px;
    padding:10px;
    box-shadow:0 4px 14px rgba(23,24,22,.08);
  }
  .group-qr .gq-img-wrap img{
    width:100%;height:auto;display:block;border-radius:8px;
  }
  .group-qr .gq-cap{
    margin-top:12px;font-size:13px;color:var(--muted);font-weight:600;
  }

  /* ===== REGISTER ===== */
  .register{margin:18px 46px 0;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:26px 30px;}
  .register .reg-title{text-align:center;font-size:20px;font-weight:800;color:var(--teal-dark);margin-bottom:20px;letter-spacing:1px;}
  .reg-body{display:flex;gap:28px;align-items:center;}
  .reg-qr{flex:0 0 auto;text-align:center;}
  .qr-box{
    width:142px;height:142px;background:#fff;border:1px solid var(--line);border-radius:12px;
    display:flex;align-items:center;justify-content:center;box-shadow:0 4px 14px rgba(23,24,22,.08);
    background-image:
      linear-gradient(45deg,#171816 25%,transparent 25%,transparent 75%,#171816 75%),
      linear-gradient(45deg,#171816 25%,transparent 25%,transparent 75%,#171816 75%);
    background-size:14px 14px;background-position:0 0,7px 7px;
  }
  .qr-ph{background:#fffdf8;color:var(--muted);font-size:13px;font-weight:700;text-align:center;line-height:1.4;padding:12px 10px;border-radius:6px;}
  .qr-cap{margin-top:10px;font-size:12.5px;color:var(--muted);font-weight:600;}
  .qr-real{background:#fff;background-image:none;}
  .qr-img{width:100%;height:100%;object-fit:contain;display:block;border-radius:10px;}

  .reg-info{flex:1;}
  .reg-step{font-size:14px;color:var(--ink);font-weight:600;margin-bottom:12px;display:flex;align-items:center;gap:9px;}
  .reg-step .num{flex:0 0 22px;height:22px;border-radius:50%;background:var(--teal);color:#fff;font-size:12px;font-weight:800;display:flex;align-items:center;justify-content:center;}
  .reg-wx{font-size:19px;color:var(--coral);font-weight:800;margin:2px 0 14px;padding-left:31px;}
  .reg-tip{font-size:12.5px;color:var(--muted);padding-left:31px;line-height:1.6;}

  /* ===== RESPONSIVE LAYOUT ===== */
  html{background:#e9e4da;}
  img{max-width:100%;}
  .poster{max-width:100%;}

  /* iPad / Android 平板及窄屏笔记本：保持海报比例，同时保证两侧留白。 */
  @media (max-width: 820px){
    body{padding:20px max(16px, env(safe-area-inset-right)) 28px max(16px, env(safe-area-inset-left));}
    .poster{width:100%;}
  }

  /* iPhone / Android 手机：优先保证文字可读、二维码可扫和单手浏览。 */
  @media (max-width: 600px){
    body{padding:0;background:var(--paper);}
    .poster{width:100%;border-radius:0;box-shadow:none;}
    .hero{padding:36px 24px 30px;}
    .hero h1{font-size:29px;line-height:1.32;margin-bottom:14px;letter-spacing:0;}
    .hero p.sub{font-size:14px;line-height:1.75;}
    .chip{font-size:11px;letter-spacing:1px;padding:6px 11px;margin-bottom:16px;}
    .hero .strokes{margin-top:20px;gap:8px;}
    .stroke{width:100%;padding:9px 11px;font-size:12.5px;}

    .sec-head{padding:0 24px;margin-top:34px;gap:10px;}
    .sec-bar{width:5px;height:25px;}
    .sec-head h2{font-size:20px;letter-spacing:0;}
    .sec-head .en{display:none;}
    .prob-intro{margin:14px 24px 0;font-size:14px;}
    .prob-grid{grid-template-columns:1fr;gap:10px;padding:14px 24px 0;}
    .pcard{padding:14px 15px;border-radius:10px;}
    .pcard .q{font-size:14px;}
    .pcard .a{font-size:12.5px;}

    .map-wrap{margin:14px 24px 0;padding:24px 20px;border-radius:13px;}
    .map-wrap h3{font-size:18px;line-height:1.45;}
    .map-wrap .lead{font-size:13px;margin-bottom:16px;}
    .layers{grid-template-columns:1fr;gap:9px;}
    .layer{padding:11px 12px;}
    .abilities{grid-template-columns:1fr 1fr;gap:9px;padding:14px 24px 0;}
    .ability{padding:13px 9px;}
    .ability .num{font-size:20px;}
    .ability .nm{font-size:13.5px;}
    .ability .ds{font-size:11px;}

    .days{padding:14px 24px 0;}
    .day{gap:12px;padding:12px 0;}
    .day .dno{flex-basis:55px;width:55px;height:55px;border-radius:10px;font-size:11px;}
    .day .dno b{font-size:19px;}
    .day .dbody{padding-top:1px;}
    .day .dbody h4{font-size:15px;}
    .day .dbody p{font-size:12.5px;}

    .trans{margin:14px 24px 0;padding:24px 20px;border-radius:13px;}
    .trans .tt .big{font-size:21px;}
    .becomes{grid-template-columns:1fr;gap:12px;margin-top:16px;}
    .bec-final{font-size:14px;padding:12px;}
    .method{padding:14px 24px 0;}
    .method .box{padding:19px 18px;}
    .method .box h4{font-size:15px;}
    .step{font-size:12px;padding:7px 10px;}
    .method .note{font-size:12.5px;}

    .price{margin:32px 24px 0;padding:28px 22px;border-radius:14px;}
    .price .pbig{font-size:43px;}
    .price .deal{font-size:12.5px;line-height:1.55;margin-top:13px;}
    .cta{font-size:18px;padding:16px 12px;}
    .register{margin:14px 24px 0;padding:22px 20px;border-radius:13px;}
    .register .reg-title{font-size:18px;margin-bottom:17px;}
    .reg-body{flex-direction:column;gap:18px;align-items:center;}
    .reg-info{width:100%;}
    .reg-step{font-size:13.5px;margin-bottom:10px;}
    .reg-wx{font-size:18px;margin-bottom:12px;}
    .reg-tip{font-size:12px;}
    .group-qr{margin:14px 24px 0;padding:22px 20px;border-radius:13px;}
    .group-qr .gq-title{font-size:18px;margin-bottom:5px;}
    .group-qr .gq-sub{font-size:12.5px;margin-bottom:16px;}
    .group-qr .gq-img-wrap{width:170px;}
    .group-qr .gq-cap{font-size:12px;}
    .foot-note{padding:22px 24px max(30px, env(safe-area-inset-bottom));font-size:11.5px;}
  }

  /* 极窄屏（小尺寸 iPhone / 安卓）：进一步降低边距，避免 320px 宽度裁切。 */
  @media (max-width: 360px){
    .hero,.sec-head,.prob-intro,.prob-grid,.abilities,.days,.method,.foot-note{padding-left:18px;padding-right:18px;}
    .prob-intro{margin-left:18px;margin-right:18px;}
    .map-wrap,.trans,.price,.register,.group-qr{margin-left:18px;margin-right:18px;}
    .hero h1{font-size:27px;}
    .sec-head h2{font-size:18px;}
    .price{padding-left:18px;padding-right:18px;}
  }