:root{
    --bg:#0a1322;
    --navbg:#050F26;
    --bg2:#0d1a2e;
    --card:#12233b;
    --line:rgba(201,165,92,.22);
    --gold:#c9a55c;
    --gold-light:#e6c98a;
    --warm:#f5efe3;
    --ink:#eef3fa;
    --sub:#a8b9d0;
    --dim:#6b7f9c;
    --acc:#5b9bd5;
    --acc-light:#8fc0ea;
    --acc-rgb:91,155,213;
    --serif:"Noto Serif SC","Songti SC","STSong",serif;
    --sans:"PingFang SC","Microsoft YaHei",-apple-system,sans-serif;
  }
  *{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
  html{scroll-behavior:smooth}
  body{
    font-family:var(--sans);
    background:var(--bg);
    color:var(--ink);
    line-height:1.6;
    overflow-x:hidden;
    font-size:16px;
    padding-bottom:78px;
  }
  ::selection{background:var(--gold);color:#0a1322}

  /* ---------- 顶部固定导航 ---------- */
  .topnav{
    position:fixed;top:0;left:0;right:0;z-index:90;
    display:flex;align-items:center;justify-content:space-between;
    padding:8px 22px;
    background:var(--navbg);
    border-bottom:1px solid rgba(201,165,92,.10);
  }
  .topnav-left{display:flex;align-items:center;gap:14px}
  .back-btn{
    display:inline-flex;align-items:center;gap:4px;
    color:var(--sub);text-decoration:none;font-size:13px;letter-spacing:1px;
    padding:6px 12px;border-radius:8px;background:rgba(255,255,255,.04);
    transition:all .2s;
  }
  .back-btn:hover{color:var(--ink);background:rgba(255,255,255,.08)}
  .topnav-logo{display:flex;align-items:center;gap:8px;text-decoration:none}
  .topnav-logo img{height:32px;width:auto;display:block}
  .topnav-cta{
    font-size:13px;color:#0a1322;background:linear-gradient(135deg,var(--gold-light),var(--gold));
    padding:8px 18px;border-radius:999px;text-decoration:none;font-weight:600;
    letter-spacing:1px;white-space:nowrap;
  }

  /* ---------- 通用屏 ---------- */
  .screen{
    padding:64px 22px;max-width:780px;margin:0 auto;
  }
  .screen + .screen{border-top:1px dashed rgba(201,165,92,.12)}
  .kicker{
    text-align:center;font-size:11px;letter-spacing:4px;color:var(--acc);
    margin-bottom:12px;
  }
  .h-title{
    text-align:center;font-family:var(--serif);font-size:clamp(22px,5.2vw,30px);
    line-height:1.45;letter-spacing:1.5px;color:var(--ink);
    max-width:680px;margin:0 auto;
  }
  .h-title span{color:var(--acc-light)}
  .h-sub{
    text-align:center;max-width:540px;margin:14px auto 0;
    color:var(--sub);font-size:15px;line-height:1.7;
  }

  /* ---------- 屏 1：案例 Hero ---------- */
  .cover-screen{
    padding:88px 22px 56px;
    background:
      radial-gradient(ellipse 80% 50% at 50% -10%,rgba(91,155,213,.16),transparent 65%),
      var(--bg);
    text-align:center;
  }
  .cover-tag{
    display:inline-block;font-size:12px;letter-spacing:3px;color:var(--acc-light);
    border:1px solid rgba(var(--acc-rgb),.4);border-radius:999px;
    padding:5px 16px;margin-bottom:22px;
    background:rgba(var(--acc-rgb),.08);
  }
  .cover-h1{
    font-family:var(--serif);font-weight:700;
    font-size:clamp(24px,6vw,34px);line-height:1.45;letter-spacing:2px;
    color:var(--ink);max-width:680px;margin:0 auto;
  }
  .cover-h1 em{font-style:normal;color:var(--acc-light)}
  .cover-sub{
    margin:18px auto 0;color:var(--sub);font-size:15px;letter-spacing:1px;
  }
  .cover-stat{
    display:inline-flex;gap:6px;flex-wrap:wrap;justify-content:center;
    margin:24px auto 0;
  }
  .cover-stat span{
    font-size:13px;color:var(--acc-light);letter-spacing:1px;
    background:rgba(var(--acc-rgb),.08);border:1px solid rgba(var(--acc-rgb),.3);
    padding:6px 14px;border-radius:999px;
  }
  .cover-figure{
    max-width:560px;margin:34px auto 0;
    border-radius:10px;overflow:hidden;
    border:1px solid rgba(var(--acc-rgb),.35);
    box-shadow:0 24px 60px rgba(0,0,0,.5),0 0 0 6px rgba(var(--acc-rgb),.06);
    background:#0d1526;
  }
  .cover-figure img{width:100%;height:auto;display:block}
  .cover-cta-wrap{margin:36px 0 0}
  .cover-cta{
    display:inline-block;font-size:14px;font-weight:600;letter-spacing:2px;
    color:#0a1322;background:linear-gradient(135deg,var(--gold-light),var(--gold));
    padding:13px 38px;border-radius:999px;text-decoration:none;
    box-shadow:0 10px 28px rgba(201,165,92,.25);
  }

  /* ---------- 屏 2：核心判断 ---------- */
  .judge-screen{
    background:linear-gradient(180deg,var(--bg) 0%,#0d1a2e 100%);
  }
  .judge{
    max-width:640px;margin:0 auto;text-align:center;position:relative;
    padding:34px 26px;
  }
  .judge::before,.judge::after{
    font-family:var(--serif);font-size:56px;line-height:1;
    color:rgba(var(--acc-rgb),.35);
    position:absolute;
  }
  .judge::before{content:"“";top:8px;left:6px}
  .judge::after{content:"”";bottom:-18px;right:6px}
  .judge-text{
    font-family:var(--serif);font-size:clamp(19px,4.6vw,25px);
    line-height:1.75;letter-spacing:1.5px;color:var(--ink);
  }
  .judge-text em{font-style:normal;color:var(--acc-light)}

  /* ---------- 屏 3：核心难点 ---------- */
  .points{
    display:grid;grid-template-columns:repeat(2,1fr);gap:14px;
    max-width:680px;margin:32px auto 0;
  }
  .pt{
    background:var(--card);border:1px solid rgba(var(--acc-rgb),.2);
    border-radius:12px;padding:20px 18px;
  }
  .pt-num{
    font-family:var(--serif);font-weight:700;color:var(--acc);
    font-size:13px;letter-spacing:1px;
  }
  .pt-title{font-family:var(--serif);font-size:16px;color:var(--ink);margin:8px 0 6px;letter-spacing:.5px;line-height:1.5}
  .pt-text{font-size:14px;color:var(--sub);line-height:1.65}

  /* ---------- 屏 4：6 项工作 ---------- */
  .work-list{
    max-width:680px;margin:32px auto 0;
  }
  .work-item{
    display:flex;gap:16px;padding:18px 0;
    border-bottom:1px dashed rgba(var(--acc-rgb),.18);
  }
  .work-item:last-child{border-bottom:none}
  .work-no{
    font-family:var(--serif);font-weight:700;color:var(--acc);
    font-size:20px;min-width:42px;line-height:1;
  }
  .work-content h4{font-family:var(--serif);font-size:17px;color:var(--ink);letter-spacing:.5px;margin-bottom:6px}
  .work-content p{font-size:14px;color:var(--sub);line-height:1.65}

  /* ---------- 屏 5：6 张精选页面 ---------- */
  .hd-hint{
    text-align:center;font-size:12px;color:var(--dim);
    margin-top:12px;letter-spacing:1px;opacity:.85;
  }
  .ppt-stack{
    max-width:760px;margin:26px auto 0;display:flex;flex-direction:column;gap:28px;
  }
  .ppt-card{
    background:var(--card);border:1px solid var(--line);border-radius:14px;
    overflow:hidden;cursor:zoom-in;
  }
  .ppt-img{
    width:100%;height:auto;display:block;cursor:zoom-in;
    background:#0a1322;
  }
  .ppt-tag{
    display:flex;align-items:center;justify-content:space-between;
    padding:14px 18px;border-top:1px solid rgba(var(--acc-rgb),.16);
  }
  .ppt-num{
    font-family:var(--serif);color:var(--acc-light);font-size:13px;letter-spacing:1px;
    white-space:nowrap;
  }
  .ppt-text{
    font-size:14px;color:var(--ink);line-height:1.6;
    text-align:right;flex:1;margin-left:14px;
  }

  /* 文档型案例：报告视窗框架 */
  .doc-frame .ppt-card{border-radius:12px}
  .doc-bar{
    display:flex;align-items:center;gap:8px;
    background:#0b1830;border-bottom:1px solid rgba(var(--acc-rgb),.2);
    padding:10px 14px;
  }
  .doc-dots{display:flex;gap:6px}
  .doc-dots i{width:9px;height:9px;border-radius:50%;background:rgba(255,255,255,.18);display:block}
  .doc-dots i:first-child{background:rgba(var(--acc-rgb),.6)}
  .doc-name{font-size:11px;color:var(--dim);letter-spacing:1.5px}

  /* ---------- 屏 6：完整页面画廊（默认收起） ---------- */
  .gallery-section{
    background:linear-gradient(180deg,var(--bg) 0%,#0d1a2e 100%);
  }
  .gallery-toggle{
    display:flex;align-items:center;justify-content:center;gap:8px;
    max-width:440px;margin:30px auto 0;
    padding:13px 22px;
    border:1px solid rgba(var(--acc-rgb),.45);border-radius:999px;
    color:var(--acc-light);font-size:14px;letter-spacing:1px;
    cursor:pointer;user-select:none;
    transition:all .25s;background:rgba(var(--acc-rgb),.06);
  }
  .gallery-toggle:hover{background:rgba(var(--acc-rgb),.14);border-color:rgba(var(--acc-rgb),.7)}
  .toggle-arrow{transition:transform .3s;font-size:12px}
  .gallery-wrap{overflow:hidden;max-height:2400px;transition:max-height .45s ease}
  .gallery-wrap.collapsed{max-height:0}
  .gallery-tip{
    text-align:center;font-size:13px;color:var(--dim);margin-top:22px;
    letter-spacing:1px;
  }
  .gallery-scroll{
    display:flex;gap:14px;overflow-x:auto;
    padding:28px 22px 14px;margin:0 -22px;
    scroll-snap-type:x mandatory;
    -webkit-overflow-scrolling:touch;
  }
  .gallery-scroll::-webkit-scrollbar{display:none}
  .gallery-card{
    flex:0 0 44%;
    max-width:250px;
    background:var(--card);border:1px solid var(--line);border-radius:12px;
    overflow:hidden;cursor:zoom-in;scroll-snap-align:start;
  }
  .gallery-card img{width:100%;height:auto;display:block;background:#0a1322}
  .gallery-card .ppt-tag{
    border-top:none;padding:10px 14px;
  }
  .gallery-card .ppt-num{font-size:11px}
  .gallery-card .ppt-text{font-size:12px;color:var(--sub)}

  /* ---------- 屏 7：最终交付 ---------- */
  .deliver-list{
    max-width:680px;margin:32px auto 0;
    background:var(--card);border:1px solid var(--line);border-radius:14px;
    padding:6px 0;
  }
  .deliver-item{
    padding:14px 22px;border-bottom:1px dashed rgba(201,165,92,.12);
    font-size:15px;color:var(--ink);display:flex;align-items:center;gap:12px;
  }
  .deliver-item:last-child{border-bottom:none}
  .deliver-item::before{
    content:"";min-width:6px;width:6px;height:6px;
    border:1px solid var(--acc);transform:rotate(45deg);
  }

  /* ---------- 屏 8：FAQ（默认折叠） ---------- */
  .faq-list{max-width:680px;margin:32px auto 0;display:flex;flex-direction:column;gap:12px}
  .faq-item{
    background:var(--card);border:1px solid rgba(var(--acc-rgb),.16);
    border-radius:12px;overflow:hidden;
  }
  .faq-item summary{
    list-style:none;cursor:pointer;
    font-family:var(--serif);font-size:15px;color:var(--ink);letter-spacing:.5px;
    padding:16px 20px;display:flex;align-items:flex-start;gap:10px;
    transition:background .2s;
  }
  .faq-item summary::-webkit-details-marker{display:none}
  .faq-item summary:hover{background:rgba(var(--acc-rgb),.05)}
  .faq-item summary::before{
    content:"Q";font-family:var(--serif);color:var(--acc-light);
    font-size:14px;font-weight:700;letter-spacing:1px;
    border:1px solid rgba(var(--acc-rgb),.35);border-radius:4px;
    padding:1px 7px;line-height:1.4;flex-shrink:0;
  }
  .faq-item summary::after{
    content:"+";margin-left:auto;color:var(--acc);font-size:17px;
    font-weight:400;flex-shrink:0;transition:transform .25s;line-height:1.3;
  }
  .faq-item[open] summary::after{transform:rotate(45deg)}
  .faq-a{
    font-size:14px;color:var(--sub);line-height:1.7;
    padding:0 20px 18px 57px;
  }

  /* ---------- 屏 9：CTA ---------- */
  .cta-screen{
    padding:60px 22px 110px;text-align:center;
    background:
      radial-gradient(ellipse 70% 50% at 50% 0%,rgba(201,165,92,.14),transparent 70%),
      var(--bg);
  }
  .cta-title{
    font-family:var(--serif);font-size:clamp(22px,5.2vw,30px);
    line-height:1.5;letter-spacing:1.5px;color:var(--ink);
    max-width:680px;margin:0 auto 20px;
  }
  .cta-title span{color:var(--gold-light)}
  .cta-body{
    max-width:560px;margin:0 auto 30px;color:var(--sub);font-size:15px;line-height:1.7;
  }
  .cta-btn{
    display:inline-block;font-size:15px;font-weight:600;letter-spacing:2px;
    color:#0a1322;background:linear-gradient(135deg,var(--gold-light),var(--gold));
    padding:15px 46px;border-radius:999px;text-decoration:none;
    box-shadow:0 10px 28px rgba(201,165,92,.25);
  }
  .cta-buttons{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
  .cta-btn-ghost{
    display:inline-block;font-size:14px;font-weight:500;letter-spacing:2px;
    color:var(--ink);background:transparent;border:1px solid rgba(201,165,92,.45);
    padding:14px 36px;border-radius:999px;text-decoration:none;
    transition:all .25s;
  }
  .cta-btn-ghost:hover{border-color:var(--gold);background:rgba(201,165,92,.08)}

  /* ---------- 底部隐私说明 ---------- */
  .privacy{
    text-align:center;padding:18px 22px;border-top:1px solid rgba(157,176,201,.1);
    font-size:12px;color:var(--dim);letter-spacing:1px;line-height:1.7;
    background:rgba(0,0,0,.2);
  }

  /* ---------- 底部固定 CTA ---------- */
  .float-cta{
    position:fixed;bottom:0;left:0;right:0;z-index:80;
    padding:12px 18px calc(12px + env(safe-area-inset-bottom));
    background:rgba(5,15,38,.92);
    backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
    border-top:1px solid rgba(201,165,92,.2);
    display:flex;align-items:center;justify-content:space-between;gap:14px;
  }
  .float-cta-text{font-size:13px;color:var(--sub)}
  .float-cta-text b{color:var(--ink);display:block;font-size:14px;margin-bottom:2px}
  .float-cta-btn{
    font-size:14px;font-weight:600;color:#0a1322;
    background:linear-gradient(135deg,var(--gold-light),var(--gold));
    padding:11px 26px;border-radius:999px;text-decoration:none;
    white-space:nowrap;box-shadow:0 6px 20px rgba(201,165,92,.25);
  }

  /* ---------- 图片放大 lightbox ---------- */
  .lightbox{
    position:fixed;inset:0;z-index:200;background:rgba(4,9,18,.94);
    display:none;align-items:center;justify-content:center;
    padding:24px;cursor:zoom-out;
  }
  .lightbox.open{display:flex;animation:lbIn .2s ease}
  @keyframes lbIn{from{opacity:0}to{opacity:1}}
  .lightbox img{max-width:100%;max-height:90vh;border-radius:8px}
  .lightbox-close{
    position:absolute;top:18px;right:18px;width:38px;height:38px;border-radius:50%;
    border:1px solid rgba(255,255,255,.4);background:rgba(0,0,0,.3);color:#fff;
    font-size:18px;cursor:pointer;line-height:1;
  }

  /* ---------- 移动端微调 ---------- */
  @media (max-width:640px){
    .points{grid-template-columns:1fr}
    .cover-screen{padding:78px 16px 36px}
    .screen{padding:54px 16px}
    .gallery-scroll{padding-left:16px;padding-right:16px;margin:0 -16px}
    .gallery-card{flex:0 0 62%}
    .float-cta-text{display:none}
    .topnav{padding:8px 14px}
    .topnav-cta{padding:7px 14px;font-size:12px}
    .judge{padding:28px 18px}
    .faq-a{padding-left:20px;padding-right:16px}
    .ppt-tag{flex-direction:column;align-items:flex-start;gap:6px}
    .ppt-text{text-align:left;margin-left:0}
  }

/* ===== 微信二维码弹窗 ===== */
.qr-mask{position:fixed;inset:0;background:rgba(8,16,32,.78);z-index:10001;display:none;align-items:center;justify-content:center;padding:24px;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}
.qr-mask.open{display:flex;animation:qrFadeIn .25s ease-out}
@keyframes qrFadeIn{from{opacity:0}to{opacity:1}}
.qr-card{position:relative;background:#fff;border-radius:18px;padding:32px 32px 24px;width:100%;max-width:360px;box-shadow:0 30px 80px rgba(0,0,0,.45);animation:qrPop .35s cubic-bezier(.2,.9,.3,1.2);text-align:center;margin:auto}
@keyframes qrPop{from{transform:scale(.82);opacity:0}to{transform:scale(1);opacity:1}}
.qr-close{position:absolute;top:12px;right:12px;width:34px;height:34px;border-radius:50%;background:rgba(0,0,0,.06);border:0;color:#333;font-size:22px;cursor:pointer;line-height:1;display:flex;align-items:center;justify-content:center;transition:all .2s}
.qr-close:hover{background:rgba(0,0,0,.12);transform:rotate(90deg)}
.qr-head{font-size:13px;color:#666;letter-spacing:2px;margin-bottom:18px;font-weight:500}
.qr-head::before,.qr-head::after{content:'';display:inline-block;width:18px;height:1px;background:#c9a55c;vertical-align:middle;margin:0 10px}
.qr-img-wrap{display:inline-block;padding:10px;background:linear-gradient(135deg,#fafaf7,#f5f0e6);border-radius:12px;border:1px solid #ebe5d8}
.qr-img{width:240px;height:240px;border-radius:6px;display:block}
.qr-name{font-size:18px;font-weight:600;color:#1a2a3a;margin-top:18px;letter-spacing:1px}
.qr-tag{font-size:12px;color:#888;margin-top:6px;letter-spacing:1.5px}
.qr-tip{font-size:13px;color:#fff;background:linear-gradient(135deg,#1c3a5e,#0e2a47);border-radius:10px;padding:12px 16px;margin-top:20px;line-height:1.7;letter-spacing:0.5px}
.qr-meta{font-size:12px;color:#aaa;margin-top:14px;letter-spacing:.5px}
@media(max-width:480px){.qr-card{padding:28px 22px 22px;border-radius:16px}.qr-img{width:210px;height:210px}.qr-head{font-size:12px;letter-spacing:1.5px}.qr-head::before,.qr-head::after{width:12px;margin:0 6px}}

[hidden]{display:none!important}
button{font-family:var(--sans)}
body{padding-bottom:0}
.topnav{gap:12px}
.topnav button{border:0;cursor:pointer;font-size:14px}
.back-btn{font-size:14px;white-space:nowrap}
.competition-intro{padding-bottom:32px}
.competition-intro .cover-sub{max-width:760px;line-height:1.8;font-size:16px}
.case-description{font-size:16px;line-height:1.8;color:var(--sub);max-width:680px;margin:20px auto 0}
.competition-intro .cover-tag{font-size:14px}
.competition-intro .cover-stat span{font-size:14px}
.competition-gallery{padding-top:32px;max-width:940px}
.gallery-heading{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:14px}
.gallery-heading h2{font-family:var(--serif);font-size:24px;letter-spacing:1px}
.pdf-link{font-size:14px;color:var(--gold-light);text-decoration:none;padding:8px 16px;border:1px solid var(--line);border-radius:8px}
.competition-gallery .hd-hint{text-align:left;font-size:14px;margin-top:12px;color:var(--sub)}
.competition-gallery .ppt-stack{margin-top:24px;max-width:none;gap:24px}
.page-card{padding:0;text-align:left;width:100%;color:var(--ink);display:block;border:1px solid var(--line);cursor:zoom-in}
.page-card:focus-visible,.pdf-link:focus-visible,button:focus-visible{outline:2px solid var(--gold-light);outline-offset:4px}
.page-caption{display:block;font-size:14px;color:var(--sub);padding:12px 16px;border-top:1px solid var(--line)}
.load-wrap{display:flex;justify-content:center}
.load-wrap .gallery-toggle{width:auto;font-size:16px;background:rgba(201,165,92,.08);color:var(--gold-light);border-color:var(--line)}
.page-progress{margin-top:18px;text-align:center;font-size:14px;color:var(--sub)}
.competition-cta{text-align:center}
.competition-cta button{margin-top:26px;border:0;cursor:pointer;font-size:16px}
.competition-footer{font-size:14px;text-align:center;padding:28px 16px;color:var(--sub);border-top:1px solid var(--line)}
.image-dialog{width:min(96vw,1900px);max-width:none;padding:16px;background:#081324;border:1px solid var(--line);border-radius:12px;color:var(--ink);max-height:96vh;overflow:hidden}
.image-dialog::backdrop{background:rgba(3,8,17,.9)}
.lb-controls{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;font-size:14px;flex-wrap:wrap}
.lb-actions{display:flex;gap:8px;flex-wrap:wrap}
.lb-actions button{padding:8px 12px;font-size:14px;border-radius:6px;color:var(--ink);background:var(--card);border:1px solid var(--line);cursor:pointer}
.lb-actions button:disabled{opacity:.4;cursor:default}
.lb-stage{overflow:auto;max-height:80vh;text-align:center}
.lb-stage img{display:block;margin:0 auto;max-width:100%;max-height:78vh;width:auto;height:auto}
.lb-stage.zoomed{text-align:left}
.lb-stage.zoomed img{margin:0;max-width:none;max-height:none}
.qr-mask[hidden]{display:none}
.qr-head,.qr-tag,.qr-tip{font-size:14px}
.qr-meta{font-size:13px}
@media(max-width:480px){
 .topnav{padding:8px 12px;gap:8px}
 .topnav-left{gap:8px}
 .back-btn{padding:6px 8px;font-size:13px;letter-spacing:0}
 .topnav-logo img{height:26px;max-width:86px;object-fit:contain}
 .topnav button{padding:8px 10px;font-size:13px;letter-spacing:0}
 .competition-intro{padding-left:18px;padding-right:18px}
 .competition-gallery{padding-left:16px;padding-right:16px}
 .gallery-heading h2{font-size:22px}
 .image-dialog{padding:12px}
 .lb-actions{gap:6px}
 .lb-actions button{padding:7px 9px}
}