/* ============ 交互层样式 ============ */

/* ---- 手风琴 ---- */
.acc{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:var(--paper-2);
  box-shadow:var(--sh);margin-bottom:11px;transition:box-shadow .35s var(--ease),border-color .3s}
.acc.open{box-shadow:var(--sh-h);border-color:var(--line-2)}
.acc-h{width:100%;display:flex;align-items:center;gap:14px;padding:17px 22px;background:none;border:0;
  font-family:inherit;font-size:15.5px;font-weight:700;color:var(--ink);cursor:pointer;text-align:left;
  transition:background .25s}
.acc-h:hover{background:var(--paper-3)}
.acc-n{font-family:var(--num);font-size:12px;color:var(--gold);flex:none;width:22px}
.acc-h .ar{margin-left:auto;flex:none;width:22px;height:22px;transition:transform .42s var(--ease);fill:var(--ink-3)}
.acc.open .acc-h .ar{transform:rotate(180deg);fill:var(--teal)}
.acc-b{max-height:0;overflow:hidden;transition:max-height .55s var(--ease-o)}
.acc-b .in{padding:0 22px 20px 58px;color:var(--ink-2);font-size:14.5px;line-height:1.8}
.acc-b .in ul{margin:8px 0 0;padding-left:18px}
.acc-b .in li{margin:5px 0}
.acc.open .acc-b{max-height:620px}

/* ---- 3D 翻卡 ---- */
.flip-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.flip{perspective:1200px;height:230px;cursor:pointer}
.flip-in{position:relative;width:100%;height:100%;transform-style:preserve-3d;
  transition:transform .78s cubic-bezier(.4,.05,.2,1)}
.flip.on .flip-in{transform:rotateY(180deg)}
.flip-f{position:absolute;inset:0;backface-visibility:hidden;border-radius:var(--r);padding:22px;
  display:flex;flex-direction:column;justify-content:space-between;border:1px solid var(--line);
  box-shadow:var(--sh);overflow:hidden}
.flip-f.f{background:var(--paper-2)}
.flip-f.k{background:var(--teal);color:#fff;transform:rotateY(180deg);border-color:var(--teal)}
.flip-f.f .q{font-size:15px;font-weight:700;line-height:1.6}
.flip-f.f .hint{font-size:11.5px;color:var(--ink-3);letter-spacing:.08em}
.flip-f.f .ic{width:36px;height:36px;border-radius:10px;background:var(--teal-s);display:grid;place-items:center}
.flip-f.f .ic svg{width:20px;height:20px;fill:var(--teal)}
.flip-f.k .a{font-size:14px;line-height:1.75}
.flip-f.k .lb{font-size:11.5px;letter-spacing:.14em;opacity:.8}

/* ---- 连线配对 ---- */
.match{display:grid;grid-template-columns:1fr 74px 1fr;gap:0;align-items:start;position:relative}
.match-col{display:flex;flex-direction:column;gap:10px}
.mi{background:var(--paper-2);border:1.5px solid var(--line);border-radius:var(--r-s);padding:12px 15px;
  font-size:14px;cursor:pointer;transition:all .3s var(--ease);display:flex;align-items:center;gap:10px;
  min-height:54px;box-shadow:var(--sh)}
.mi:hover{border-color:var(--line-2);transform:translateX(3px)}
.mi.sel{border-color:var(--teal);background:var(--teal-s)}
.mi.ok{border-color:var(--teal);background:var(--teal);color:#fff}
.mi.no{border-color:var(--brick);background:rgba(184,80,58,.1);animation:shake .4s}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-7px)}75%{transform:translateX(7px)}}
.mi .mk{width:24px;height:24px;border-radius:7px;background:var(--paper-3);display:grid;place-items:center;
  font-family:var(--num);font-size:11.5px;font-weight:700;color:var(--ink-2);flex:none}
.mi.ok .mk{background:rgba(255,255,255,.22);color:#fff}
.match-svg{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:5;overflow:visible}
.match-svg line{stroke:var(--teal);stroke-width:2;stroke-linecap:round;opacity:0;
  transition:opacity .35s,stroke-dashoffset .8s var(--ease-o);stroke-dasharray:600;stroke-dashoffset:600}
.match-svg line.on{opacity:.85;stroke-dashoffset:0}
.match-svg line.bad{stroke:var(--brick)}
.match-bar{display:flex;align-items:center;gap:14px;margin-top:18px;font-size:14px;color:var(--ink-2)}
.match-bar .btn{background:var(--teal);color:#fff;border:0;border-radius:99px;padding:8px 20px;font-size:13.5px;
  font-family:inherit;cursor:pointer;transition:transform .3s var(--ease)}
.match-bar .btn:hover{transform:translateY(-2px)}
.match-bar .sc{font-family:var(--num);font-weight:700;color:var(--teal)}

/* ---- 分档拖动条 ---- */
.calc{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--r-l);padding:30px 32px;
  box-shadow:var(--sh-h);display:grid;grid-template-columns:1.05fr .95fr;gap:38px;align-items:center}
.slider{margin:22px 0 8px}
.sl-top{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:12px}
.sl-top .l{font-size:13.5px;color:var(--ink-2)}
.sl-top .v{font-family:var(--num);font-size:30px;font-weight:800;color:var(--teal)}
.sl-track{position:relative;height:8px;background:var(--paper-3);border-radius:99px;cursor:pointer;
  border:1px solid var(--line)}
.sl-fill{position:absolute;left:0;top:0;bottom:0;background:var(--teal);border-radius:99px;width:0}
.sl-knob{position:absolute;top:50%;left:0;width:26px;height:26px;border-radius:99px;background:var(--paper-2);
  border:2.5px solid var(--teal);transform:translate(-50%,-50%);box-shadow:var(--sh);
  transition:transform .5s var(--ease),width .3s var(--ease),height .3s var(--ease)}
.sl-knob.drag{transform:translate(-50%,-50%) scale(1.18)}
.sl-ticks{display:flex;justify-content:space-between;margin-top:11px;position:relative}
.sl-ticks span{font-family:var(--num);font-size:11.5px;color:var(--ink-3);transition:color .3s,transform .35s var(--ease);
  transform-origin:top}
.sl-ticks span.on{color:var(--teal);font-weight:700;transform:scale(1.18)}
.calc-out{background:var(--paper-3);border-radius:var(--r);padding:24px;border:1px solid var(--line)}
.calc-out .row{display:flex;justify-content:space-between;align-items:center;padding:9px 0;
  border-bottom:1px dashed var(--line);font-size:14px}
.calc-out .row:last-child{border-bottom:0}
.calc-out .row .k{color:var(--ink-2)}
.calc-out .row .v{font-family:var(--num);font-weight:700;color:var(--ink);font-size:15px}
.calc-out .row .v.big{font-size:21px;color:var(--teal)}
.calc-note{margin-top:14px;font-size:12.5px;color:var(--ink-3);line-height:1.7}

/* ---- 跟手读数柱状图 ---- */
.chart{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--r-l);padding:26px 30px;
  box-shadow:var(--sh);position:relative}
.xbars{display:flex;align-items:flex-end;gap:14px;height:230px;padding-top:26px;position:relative}
.xbar-wrap{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;height:100%;
  position:relative;cursor:crosshair}
.xbar{width:100%;max-width:64px;background:var(--paper-4);border-radius:6px 6px 0 0;transition:height 1.1s var(--ease),
  background .3s,transform .3s var(--ease);position:relative;transform-origin:bottom}
.xbar.hi{background:var(--teal)}
.xbar.dim{background:var(--paper-4);opacity:.45}
.xbar-wrap .lb{font-size:11.5px;color:var(--ink-3);margin-top:9px;text-align:center;line-height:1.4}
.xbar-wrap .vv{font-family:var(--num);font-size:13px;font-weight:700;color:var(--ink);margin-bottom:6px;opacity:0;
  transition:opacity .3s}
.xbar-wrap.act .vv{opacity:1;color:var(--teal)}
.xline{position:absolute;top:0;bottom:34px;width:1.5px;background:var(--gold);opacity:0;pointer-events:none;
  transition:opacity .3s;z-index:4}
.xline::before{content:"";position:absolute;top:-6px;left:-4px;width:9px;height:9px;border-radius:99px;background:var(--gold)}
.xread{position:absolute;top:-4px;transform:translate(-50%,-50%);background:var(--gold);color:#fff;
  border-radius:99px;padding:5px 14px;font-family:var(--num);font-size:14px;font-weight:700;opacity:0;
  transition:opacity .3s;pointer-events:none;z-index:6;white-space:nowrap}
.xread.on{opacity:1}

/* ---- 悬停跟随预览 ---- */
.hlist{position:relative;display:flex;flex-direction:column}
.hrow{display:flex;align-items:center;gap:18px;padding:17px 20px;border-bottom:1px solid var(--line);
  transition:background .3s,padding-left .35s var(--ease);cursor:pointer}
.hrow:hover{background:var(--teal-s);padding-left:28px}
.hrow .no{font-family:var(--num);font-size:12px;color:var(--gold);font-weight:700;width:34px;flex:none}
.hrow .tt{font-size:16px;font-weight:700;flex:1}
.hrow .tt small{display:block;font-weight:400;font-size:13px;color:var(--ink-2);margin-top:3px}
.hrow .go{flex:none;width:30px;height:30px;border-radius:99px;border:1px solid var(--line-2);
  display:grid;place-items:center;transition:all .35s var(--ease)}
.hrow .go svg{width:14px;height:14px;fill:var(--ink-3);transition:fill .3s}
.hrow:hover .go{background:var(--teal);border-color:var(--teal);transform:rotate(-45deg)}
.hrow:hover .go svg{fill:#fff}
#reveal{position:fixed;top:0;left:0;width:262px;height:184px;border-radius:var(--r);overflow:hidden;
  pointer-events:none;opacity:0;transform:scale(.8);transition:opacity .35s var(--ease-o),transform .45s var(--ease);
  z-index:70;box-shadow:var(--sh-h);border:1px solid var(--line)}
#reveal.on{opacity:1;transform:scale(1)}
#reveal img{width:100%;height:100%;object-fit:cover;transition:opacity .3s}
#reveal .cp{position:absolute;left:0;right:0;bottom:0;background:linear-gradient(transparent,rgba(12,18,16,.8));
  color:#fff;font-size:12px;padding:9px 12px}

/* ---- 角落扩散悬停 ---- */
.xb{position:relative;overflow:hidden;background:var(--paper-2);border:1px solid var(--line);
  border-radius:var(--r);padding:24px;box-shadow:var(--sh);min-height:216px;
  transition:transform .45s var(--ease),box-shadow .45s var(--ease)}
.xb:hover{transform:translateY(-6px);box-shadow:var(--sh-h)}
.xb .fill{position:absolute;inset:0;background:var(--teal);clip-path:circle(0% at calc(100% - 34px) 34px);
  transition:clip-path .62s var(--ease-o);z-index:1}
.xb:hover .fill{clip-path:circle(150% at calc(100% - 34px) 34px)}
.xb .body{position:relative;z-index:2;transition:color .45s var(--ease-o)}
.xb:hover .body{color:#fff}
.xb .body .no{font-family:var(--num);font-size:12px;color:var(--gold);font-weight:700;letter-spacing:.1em}
.xb:hover .body .no{color:#F0D79A}
.xb .body h4{margin:8px 0 10px;font-size:18px;font-weight:800}
.xb .body p{margin:0;font-size:13.5px;line-height:1.7;opacity:.92}
.xb .body .who{margin-top:14px;font-size:12.5px;font-weight:700;letter-spacing:.02em}
.xb .body .grab{margin-top:10px;padding-top:10px;border-top:1px dashed var(--line);font-size:12.5px;opacity:.9}
.xb:hover .body .grab{border-top-color:rgba(255,255,255,.35)}
.xb .ar{position:absolute;right:20px;top:20px;width:28px;height:28px;border-radius:99px;z-index:3;
  background:var(--paper-3);display:grid;place-items:center;transition:transform .55s var(--ease),background .45s}
.xb .ar svg{width:14px;height:14px;fill:var(--teal);transition:fill .4s}
.xb:hover .ar{background:rgba(255,255,255,.2);transform:rotate(45deg)}
.xb:hover .ar svg{fill:#fff}

/* ---- 滚动钉住叙事 ---- */
.story{position:relative;padding:0}
.story-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:52px;align-items:start}
.story-vis{position:sticky;top:96px;height:540px;border-radius:var(--r-l);overflow:hidden;
  border:1px solid var(--line);box-shadow:var(--sh-h);background:var(--paper-3)}
.story-vis img{width:100%;height:100%;object-fit:cover;transition:transform .9s var(--ease-o),filter .6s,clip-path .7s var(--ease)}
/* 模糊玻璃层：全图半透明磨砂，作为方框外的玻璃底；方框内由清晰图 clip 窗口覆盖 */
.story-vis .story-blur{position:absolute;inset:0;z-index:3;width:100%;height:100%;object-fit:cover;
  pointer-events:none;opacity:0;filter:blur(6px) saturate(.92);
  transition:opacity .55s var(--ease-o)}
.story-vis.dim .story-blur{opacity:.86}
/* 清晰底图：仅以 clip-path 裁出方框区域显示，方框外透明、露出模糊玻璃 */
.story-vis #storyImg{position:absolute;inset:0;z-index:4;clip-path:none;-webkit-clip-path:none}
/* 方框：细金边 + 白色高光外圈，内部透明，露出清晰窗口 */
.story-ring{position:absolute;z-index:5;border:2px solid var(--gold);border-radius:14px;pointer-events:none;
  border-top-color:rgba(255,255,255,.9);border-left-color:rgba(255,255,255,.55);
  transition:left .7s var(--ease),top .7s var(--ease),width .7s var(--ease),height .7s var(--ease),opacity .45s var(--ease);
  box-shadow:0 0 0 2px rgba(255,255,255,.9),0 0 0 5px var(--gold),0 8px 28px rgba(0,0,0,.4);
  opacity:0}
.story-ring.on{opacity:1}
/* 方框移动瞬间的金色闪动，提醒视线跟随 */
.story-ring.move{animation:ringFlash .6s var(--ease-o)}
@-webkit-keyframes ringFlash{0%{box-shadow:0 0 0 4px rgba(255,255,255,.92),0 0 0 8px var(--gold),0 0 0 0 rgba(255,210,122,0),0 10px 34px rgba(0,0,0,.42)}
  35%{box-shadow:0 0 0 4px rgba(255,255,255,1),0 0 0 8px var(--gold),0 0 0 28px rgba(255,210,122,.6),0 10px 34px rgba(0,0,0,.42)}
  100%{box-shadow:0 0 0 4px rgba(255,255,255,.92),0 0 0 8px var(--gold),0 0 0 0 rgba(255,210,122,0),0 10px 34px rgba(0,0,0,.42)}}
@keyframes ringFlash{0%{box-shadow:0 0 0 4px rgba(255,255,255,.92),0 0 0 8px var(--gold),0 0 0 0 rgba(255,210,122,0),0 10px 34px rgba(0,0,0,.42)}
  35%{box-shadow:0 0 0 4px rgba(255,255,255,1),0 0 0 8px var(--gold),0 0 0 28px rgba(255,210,122,.6),0 10px 34px rgba(0,0,0,.42)}
  100%{box-shadow:0 0 0 4px rgba(255,255,255,.92),0 0 0 8px var(--gold),0 0 0 0 rgba(255,210,122,0),0 10px 34px rgba(0,0,0,.42)}}
.story-vis .cap{position:absolute;left:22px;bottom:22px;right:22px;color:#fff;z-index:6}
.story-vis .cap .st{font-family:var(--num);font-size:12px;letter-spacing:.2em;color:var(--gold);font-weight:700}
.story-vis .cap .tx{font-size:19px;font-weight:800;margin-top:6px;text-shadow:0 2px 12px rgba(0,0,0,.4)}
.story-steps{display:flex;flex-direction:column;gap:0;padding:10px 0 40px}
.st-step{padding:34px 0;opacity:.34;transition:opacity .55s var(--ease-o);border-left:2px solid var(--line);
  padding-left:26px;margin-left:6px}
.st-step.on{opacity:1;border-left-color:var(--teal)}
.st-step .sn{font-family:var(--num);font-size:12px;color:var(--gold);font-weight:700;letter-spacing:.12em}
.st-step h4{margin:7px 0 9px;font-size:20px;font-weight:800}
.st-step p{margin:0;color:var(--ink-2);font-size:14.5px;line-height:1.8}
.st-step .kv{margin-top:11px;font-size:13px;color:var(--teal);font-weight:700}

/* ---- 自检清单 ---- */
.check{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.ck{display:flex;align-items:flex-start;gap:13px;background:var(--paper-2);border:1px solid var(--line);
  border-radius:var(--r-s);padding:15px 18px;cursor:pointer;transition:all .32s var(--ease);box-shadow:var(--sh)}
.ck:hover{transform:translateX(4px);border-color:var(--line-2)}
.ck .bx{width:22px;height:22px;border-radius:6px;border:1.8px solid var(--line-2);flex:none;margin-top:2px;
  display:grid;place-items:center;transition:all .35s var(--ease)}
.ck .bx svg{width:13px;height:13px;fill:#fff;opacity:0;transition:opacity .25s}
.ck.on{background:var(--teal-s);border-color:var(--teal)}
.ck.on .bx{background:var(--teal);border-color:var(--teal)}
.ck.on .bx svg{opacity:1}
.ck.on .tx{color:var(--ink-2);text-decoration:line-through;text-decoration-color:var(--line-2)}
.ck .tx{font-size:14px;line-height:1.65}
.ck-bar{display:flex;align-items:center;gap:14px;margin-top:20px;font-size:14px;color:var(--ink-2)}
.ck-bar .bar{flex:1;height:7px;background:var(--paper-3);border-radius:99px;overflow:hidden;border:1px solid var(--line)}
.ck-bar .bar i{display:block;height:100%;width:0;background:var(--teal);border-radius:99px;
  transition:width .7s var(--ease)}
.ck-bar .pc{font-family:var(--num);font-weight:700;color:var(--teal)}

/* ---- 右下工具条 ---- */
.toolbar{position:fixed;right:26px;bottom:26px;z-index:75;display:flex;flex-direction:column;gap:10px;align-items:flex-end}
.tb{width:48px;height:48px;border-radius:99px;background:var(--paper-2);border:1px solid var(--line-2);
  box-shadow:var(--sh-h);display:flex;align-items:center;gap:11px;padding:0 13px;overflow:hidden;cursor:pointer;
  transition:width .48s var(--ease),background .3s,border-color .3s;white-space:nowrap}
.tb:hover{width:auto;background:var(--teal);border-color:var(--teal)}
.tb .lb{font-size:13px;font-weight:700;color:#fff;opacity:0;transition:opacity .2s;transition-delay:0s}
.tb:hover .lb{opacity:1;transition-delay:80ms}
.tb svg{width:20px;height:20px;fill:var(--ink);flex:none;transition:fill .3s,transform .5s var(--ease)}
.tb:hover svg{fill:#fff}

/* ---- 页脚 ---- */
.ending{padding:104px 0 60px;text-align:center;position:relative}
.ending .big{font-size:clamp(23px,2.9vw,36px);font-weight:800;line-height:1.5;max-width:26ch;margin:0 auto 26px;
  letter-spacing:-.01em}
.ending .big em{font-style:normal;color:var(--teal)}
.foot{margin-top:70px;padding-top:26px;border-top:1px solid var(--line);font-size:12.5px;color:var(--ink-3);
  display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;text-align:left}

/* ---- 章节描线（scroll 驱动） ---- */
.draw{stroke:var(--teal);stroke-width:2;fill:none;stroke-linecap:round}
.draw-p{stroke-dasharray:1200;stroke-dashoffset:1200;transition:stroke-dashoffset 1.6s var(--ease-o)}
.draw-p.in{stroke-dashoffset:0}

/* ---- 响应式 ---- */
@media(max-width:1080px){
  .hero-in{grid-template-columns:1fr;gap:38px}
  .hero-fig{align-self:auto}
  .hero-fig img{width:100%;max-width:100%;height:300px}
  .g4,.g3,.flip-grid,.kpi-row,.check{grid-template-columns:repeat(2,1fr)}
  .g6{grid-template-columns:repeat(3,1fr)}
  .story-grid,.calc,.match{grid-template-columns:1fr}
  .story-vis{position:relative;top:0;height:340px}
  .match-svg{display:none}
}
@media(max-width:680px){
  body{font-size:16px;line-height:1.78}
  html{scroll-padding-top:60px}
  .wrap{padding:0 18px}

  /* 导航：保留可横向滑动的章节入口，不隐藏 */
  .nav{height:54px}
  .nav-brand{font-size:13px;margin-right:10px}
  .nav-items{display:flex;gap:2px;padding-right:8px}
  .nav-i{padding:7px 11px;font-size:12.5px}

  /* 封面：纵向堆叠、取消 150% 溢出图与满屏留白 */
  .hero{min-height:auto;padding:78px 0 44px;align-items:flex-start}
  .hero-in{grid-template-columns:1fr;gap:24px}
  .hero-t{font-size:clamp(31px,8.6vw,44px)}
  .hero-sub{font-size:15.5px}
  .hero-fig{align-self:auto}
  .hero-fig .frame{transform:none;width:100%;border-radius:var(--r)}
  .hero-fig img{width:100%;max-width:100%;height:220px;animation:none}
  .hero-stats{grid-template-columns:repeat(3,1fr);gap:9px;max-width:none}
  .hstat{padding:11px 10px}
  .hstat .n{font-size:19px}
  .hstat .n s{font-size:11px}
  .hstat .l{font-size:10px;line-height:1.45}
  .scroll-cue{display:none}

  /* 通用区块：收紧纵向留白，避免长条感 */
  .screen{padding:52px 0}
  .screen.tall{padding:60px 0}
  .sec-h{gap:12px;margin-bottom:8px}
  .sec-no{padding-top:5px;font-size:12px}
  .sec-t{font-size:clamp(23px,6.4vw,31px)}
  .sec-lead{margin-top:16px;font-size:15px}
  .flowline{margin:44px auto}

  /* 网格单列（确保 hero-in/g2/g3/g4/flip/kpi/check/g6 全部单列） */
  .g2,.g3,.g4,.flip-grid,.kpi-row,.check,.g6{grid-template-columns:1fr}
  .flip-grid.g5{grid-template-columns:1fr}

  /* 大金额块与统计条：单列 / 紧凑 */
  .bigmoney{grid-template-columns:1fr;gap:16px;padding:22px 20px}
  .bm-v{font-size:clamp(36px,11vw,54px)}
  .stat-stack{gap:9px}
  .stat-stack .ss{padding:13px 10px}
  .stat-stack .sv{font-size:clamp(20px,6vw,26px)}
  .stat-stack .sk{font-size:11px}

  /* 数据链：展开即满宽，箭头与间距收窄 */
  .ch-node.on{width:100%}
  .ch-node{margin-bottom:22px}
  .ch-node .cd{font-size:13px}
  .ch-node:not(:last-child)::after,
  .ch-node:not(:last-child)::before{bottom:-22px;height:22px}

  /* 照片卡大图：移动端适度降高，减少无谓滚动 */
  .pcard.h420 img{height:300px}

  /* 表格横向滚动，避免窄屏被裁切 */
  .tbl{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:var(--r-s)}
  .tbl th,.tbl td{white-space:nowrap}

  /* 触屏无 hover：去掉位移与跟随高光，避免误触与性能损耗 */
  .card:hover,.pcard:hover,.xb:hover,.hstat:hover,.kpi-row .cell:hover,.ck:hover,
  .acc-h:hover,.pill:hover{transform:none}
  .card::after,.pcard::after{display:none}

  /* 结尾页 */
  .ending{padding:68px 0 46px}
  .ending .big{font-size:clamp(20px,6.2vw,29px)}

  /* 工具条：缩小并贴底角，减少遮挡 */
  .toolbar{right:12px;bottom:12px;gap:8px}
  .tb{width:44px;height:44px}
}
/* 手机端：结尾背景效果加固（竖向屏下清晰光斑与底图都提一档，避免被压缩后发弱） */
@media(max-width:680px){
  .ending .sec-bg{opacity:.72}
  .end-shards{opacity:1}
  /* 竖向屏按视口重排光斑：横向占比放大、纵向占比收小，避免椭圆被拉成细条 */
  .end-shards{
    -webkit-mask-image:
       radial-gradient(46% 24% at 12% 13%, #000 50%, transparent 72%),
       radial-gradient(52% 18% at 88% 11%, #000 48%, transparent 70%),
       radial-gradient(34% 24% at 92% 70%, #000 52%, transparent 74%),
       radial-gradient(50% 22% at 9% 80%, #000 50%, transparent 72%),
       radial-gradient(80% 9% at 50% 99%, #000 46%, transparent 72%);
    mask-image:
       radial-gradient(46% 24% at 12% 13%, #000 50%, transparent 72%),
       radial-gradient(52% 18% at 88% 11%, #000 48%, transparent 70%),
       radial-gradient(34% 24% at 92% 70%, #000 52%, transparent 74%),
       radial-gradient(50% 22% at 9% 80%, #000 50%, transparent 72%),
       radial-gradient(80% 9% at 50% 99%, #000 46%, transparent 72%);
  }
}
@media(prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
  #flow{display:none}
}