/* ===== 分离机制的优化 页面样式（外置） ===== */
.sm-wrap{max-width:1200px;margin:0 auto;padding:0 24px;}
.sm-sec{padding:64px 24px;}
.sm-sec-light{background:linear-gradient(135deg,#f7fafc 0%,#eef4f9 100%);}
.sm-sec-white{background:#fff;}
.sm-sec-dark{background:linear-gradient(135deg,#0a1628 0%,#0d3b66 100%);}

/* Hero */
.sm-hero{position:relative;width:100%;overflow:hidden;background:linear-gradient(135deg,#081422 0%,#0d3b66 55%,#1a5276 100%);padding:96px 0 86px;}
.sm-hero-glow{position:absolute;inset:0;opacity:.18;background-image:radial-gradient(circle at 22% 32%,#4fc3f7 0%,transparent 45%),radial-gradient(circle at 78% 72%,#00bcd4 0%,transparent 42%);}
.sm-hero-in{position:relative;max-width:1200px;margin:0 auto;padding:0 24px;box-sizing:border-box;}
.sm-eyebrow{font-size:13px;letter-spacing:8px;color:#4fc3f7;margin-bottom:18px;}
.sm-hero h1{font-size:48px;font-weight:700;margin:0 0 18px;color:#fff;line-height:1.2;}
.sm-hero-sub{font-size:17px;color:#b0c4de;margin:0 0 32px;max-width:720px;line-height:1.8;}
.sm-hero-sub strong{color:#7fd6ff;font-weight:600;}
.sm-jump{display:flex;gap:12px;flex-wrap:wrap;}
.sm-jump-link{display:flex;align-items:center;gap:9px;padding:10px 20px;border-radius:999px;border:1px solid rgba(79,195,247,.35);color:#cfe6ff;text-decoration:none;font-size:13.5px;background:rgba(255,255,255,.04);transition:all .25s ease;}
.sm-jump-link b{font-size:11px;color:#4fc3f7;font-weight:800;letter-spacing:1px;}
.sm-jump-link:hover{background:rgba(79,195,247,.16);border-color:#4fc3f7;color:#fff;transform:translateY(-2px);box-shadow:0 8px 22px rgba(79,195,247,.25);}

/* 引言 */
.sm-intro{background:#fff;padding:52px 24px;}
.sm-intro-in{max-width:900px;margin:0 auto;}
.sm-intro-bar{width:60px;height:3px;background:#0068b3;margin:0 auto 24px;}
.sm-intro p{font-size:15.5px;line-height:2;color:#4a5a6a;margin:0;text-indent:2em;text-align:justify;}
.sm-intro strong{color:#0068b3;}

/* 标题组 */
.sm-head{text-align:center;margin-bottom:40px;}
.sm-tag{display:inline-block;background:#0068b3;color:#fff;font-size:12px;padding:4px 14px;border-radius:20px;letter-spacing:2px;margin-bottom:14px;}
.sm-head h2{margin:0;font-size:30px;font-weight:700;color:#1a2b3c;}
.sm-head p{font-size:14px;color:#8a9aaa;margin:12px 0 0;}
.sm-sec-dark .sm-tag{background:rgba(79,195,247,.14);color:#4fc3f7;border:1px solid rgba(79,195,247,.35);}
.sm-sec-dark .sm-head h2{color:#fff;}
.sm-sec-dark .sm-head p{color:#8aa4c0;}

/* 01 三大机制 */
.sm-mechs{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:start;}
.sm-mech{--ac:#2f9fd6;--ac-d:#0068b3;position:relative;background:#fff;border-radius:16px;border-top:4px solid var(--ac);padding:28px 26px 20px;box-shadow:0 8px 30px rgba(0,104,179,.10);cursor:pointer;transition:transform .28s ease,box-shadow .28s ease;}
.sm-mech[data-mech="fil"]{--ac:#48c9b0;--ac-d:#16a085;}
.sm-mech[data-mech="eva"]{--ac:#f5b041;--ac-d:#e67e22;}
.sm-mech:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(0,104,179,.18);}
.sm-mech:focus-visible{outline:2px solid var(--ac);outline-offset:3px;}
.sm-mech.is-active{transform:translateY(-6px);box-shadow:0 0 0 2px var(--ac),0 18px 40px rgba(0,104,179,.20);}
.sm-mech-top{display:flex;align-items:center;gap:12px;margin-bottom:14px;}
.sm-num{width:44px;height:44px;flex:0 0 44px;border-radius:12px;background:linear-gradient(135deg,var(--ac),var(--ac-d));display:flex;align-items:center;justify-content:center;color:#fff;font-size:19px;font-weight:800;transition:transform .28s ease,box-shadow .28s ease;}
.sm-mech.is-active .sm-num{transform:scale(1.08);box-shadow:0 0 18px var(--ac);}
.sm-mech-top h3{margin:0;font-size:20px;font-weight:700;color:#1a2b3c;}
.sm-en{font-size:11px;color:#8a9aaa;letter-spacing:2px;}
.sm-mech>p{margin:0 0 16px;font-size:13.5px;line-height:1.9;color:#4a5a6a;text-align:justify;}
.sm-eq-label{font-size:12px;font-weight:700;color:var(--ac-d);margin-bottom:8px;}
.sm-eq-label em{color:#b8c8d8;font-weight:400;font-size:11px;font-style:normal;}
.sm-devs{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;}
.sm-devs-3{grid-template-columns:repeat(3,1fr);}
.sm-dev{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;padding:10px 4px;border-radius:10px;background:#fff;border:1px solid #e0ecf5;text-decoration:none;transition:all .25s ease;box-shadow:0 1px 4px rgba(0,104,179,.05);}
.sm-dev:hover{transform:translateY(-3px);box-shadow:0 6px 16px rgba(0,104,179,.16);border-color:var(--ac);background:#f6fbff;}
.sm-dev-name{font-size:11px;font-weight:600;color:#33475b;letter-spacing:.5px;white-space:nowrap;}
.sm-dev:hover .sm-dev-name{color:var(--ac-d);}
.sm-mech-hint{display:flex;align-items:center;gap:6px;margin-top:14px;padding-top:12px;border-top:1px dashed #e2ecf4;font-size:12px;color:#9bb0c2;transition:color .25s ease;}
.sm-mech-hint i{font-style:normal;transition:transform .3s ease;display:inline-block;}
.sm-mech:hover .sm-mech-hint{color:var(--ac-d);}
.sm-mech.is-active .sm-mech-hint{color:var(--ac-d);font-weight:600;}
.sm-mech.is-active .sm-mech-hint i{transform:rotate(180deg);}
.sm-mech-extra{max-height:0;overflow:hidden;opacity:0;transition:max-height .38s ease,opacity .3s ease,margin .3s ease;}
.sm-mech.is-active .sm-mech-extra{max-height:260px;opacity:1;margin-top:12px;}
.sm-mech-extra div{background:rgba(0,104,179,.05);border-left:3px solid var(--ac);border-radius:0 8px 8px 0;padding:12px 14px;font-size:12.5px;line-height:1.85;color:#4a5a6a;}
.sm-mech-extra b{color:var(--ac-d);}

/* 适用边界 */
.sm-edge{display:flex;align-items:center;gap:18px;flex-wrap:wrap;background:#fff;border-radius:14px;padding:20px 26px;margin-top:24px;box-shadow:0 4px 20px rgba(0,0,0,.06);}
.sm-edge-t{font-size:14px;font-weight:700;color:#1a2b3c;white-space:nowrap;}
.sm-chips{display:flex;gap:12px;flex-wrap:wrap;}
.sm-chip{font-size:13px;font-weight:600;padding:8px 16px;border-radius:20px;cursor:default;transition:transform .22s ease,box-shadow .22s ease;}
.sm-chip-blue{background:#eef7fd;color:#0068b3;}
.sm-chip-green{background:#eefaf8;color:#16a085;}
.sm-chip-orange{background:#fdf6ec;color:#e67e22;}
.sm-chip:hover{transform:translateY(-2px);box-shadow:0 6px 16px rgba(0,0,0,.08);}
.sm-edge-note{font-size:13px;color:#8a9aaa;flex:1;min-width:200px;text-align:right;}

/* 02 四参数 */
.sm-params{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.sm-param{--ac:#4fc3f7;position:relative;background:rgba(255,255,255,.06);border:1px solid rgba(79,195,247,.25);border-radius:14px;padding:24px;cursor:pointer;transition:transform .28s ease,box-shadow .28s ease,background .28s ease,border-color .28s ease;}
.sm-param[data-param="rho"]{--ac:#48c9b0;border-color:rgba(72,201,176,.25);}
.sm-param[data-param="mu"]{--ac:#f5b041;border-color:rgba(245,176,65,.25);}
.sm-param[data-param="T"]{--ac:#f1948a;border-color:rgba(241,148,138,.25);}
.sm-param:hover{transform:translateY(-6px);box-shadow:0 14px 34px rgba(0,0,0,.35);background:rgba(255,255,255,.09);}
.sm-param.is-active{transform:translateY(-6px);background:rgba(255,255,255,.10);border-color:var(--ac);box-shadow:0 0 0 1px var(--ac),0 0 28px rgba(79,195,247,.3),0 16px 36px rgba(0,0,0,.4);}
.sm-param-h{display:flex;align-items:center;gap:10px;margin-bottom:12px;}
.sm-sym{font-size:26px;font-weight:800;color:var(--ac);background:rgba(255,255,255,.08);width:48px;height:48px;flex:0 0 48px;border-radius:10px;display:flex;align-items:center;justify-content:center;transition:transform .28s ease,text-shadow .28s ease;}
.sm-param:hover .sm-sym{transform:translateX(6px) scale(1.06);}
.sm-param.is-active .sm-sym{transform:translateX(6px) scale(1.1);text-shadow:0 0 16px var(--ac);}
.sm-param-h h3{margin:0;font-size:17px;font-weight:700;color:#fff;}
.sm-param>p{margin:0;font-size:13px;line-height:1.9;color:#b0c4de;text-align:justify;}
.sm-param>p strong{color:var(--ac);}
.sm-param-hint{display:inline-flex;align-items:center;gap:5px;margin-top:12px;font-size:11.5px;color:#6f8ca8;letter-spacing:.5px;transition:color .25s ease;}
.sm-param:hover .sm-param-hint,.sm-param.is-active .sm-param-hint{color:var(--ac);}

/* 03 表格 */
.sm-table-wrap{overflow-x:auto;border-radius:14px;box-shadow:0 6px 28px rgba(0,0,0,.08);}
.sm-table{width:100%;border-collapse:collapse;font-size:13px;background:#fff;}
.sm-table thead tr{background:#0068b3;color:#fff;}
.sm-table thead.sm-thead-deep tr{background:#0d3b66;}
.sm-table th{padding:13px 18px;text-align:left;}
.sm-table th.sm-th-w18{width:18%;}
.sm-table th.sm-th-w14{width:14%;}
.sm-table td{padding:12px 18px;color:#4a5a6a;}
.sm-table tbody tr{border-bottom:1px solid #eef2f6;transition:background .22s ease,box-shadow .22s ease;}
.sm-table tbody tr:nth-child(even){background:#fafbfc;}
.sm-table tbody tr:hover{background:#eef6fd;}
.sm-table tbody tr.is-hit{background:#e3f3ff;box-shadow:inset 3px 0 0 #0068b3;}
.sm-table .sm-key{font-weight:700;}
.sm-key-blue{color:#2f9fd6;}
.sm-key-teal{color:#16a085;}
.sm-key-orange{color:#e67e22;}
.sm-tip{font-size:12.5px;color:#8a9aaa;text-align:center;margin:16px 0 0;}
.sm-tip b{color:#0068b3;}
.sm-table-note{margin-top:28px;}
.sm-neg{color:#c0392b;}
.sm-pos{color:#0068b3;font-weight:600;}
.sm-wrap-narrow{max-width:1100px;}

/* 04 判定流程 */
.sm-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.sm-step{--ac:#4fc3f7;background:rgba(255,255,255,.06);border:1px solid rgba(79,195,247,.3);border-radius:14px;padding:24px 20px 18px;text-align:center;cursor:pointer;transition:transform .28s ease,box-shadow .28s ease,background .28s ease,border-color .28s ease;}
.sm-step[data-step="2"]{--ac:#48c9b0;border-color:rgba(72,201,176,.3);}
.sm-step[data-step="3"]{--ac:#f5b041;border-color:rgba(245,176,65,.3);}
.sm-step[data-step="4"]{--ac:#bb8fce;border-color:rgba(187,143,206,.3);}
.sm-step:hover{transform:translateY(-5px);background:rgba(255,255,255,.09);box-shadow:0 14px 32px rgba(0,0,0,.32);}
.sm-step.is-active{background:rgba(255,255,255,.10);border-color:var(--ac);box-shadow:0 0 0 1px var(--ac),0 0 26px rgba(79,195,247,.28),0 16px 34px rgba(0,0,0,.38);transform:translateY(-5px);}
.sm-step-no{font-size:26px;font-weight:800;color:rgba(255,255,255,.18);letter-spacing:1px;margin-bottom:6px;transition:color .28s ease,text-shadow .28s ease;}
.sm-step.is-active .sm-step-no{color:var(--ac);text-shadow:0 0 18px var(--ac);}
.sm-step-t{font-size:16px;font-weight:700;color:#eaf4ff;margin-bottom:8px;}
.sm-step.is-active .sm-step-t{color:#fff;}
.sm-step-d{font-size:12.5px;color:#b0c4de;line-height:1.8;}
.sm-step-extra{max-height:0;overflow:hidden;opacity:0;transition:max-height .36s ease,opacity .3s ease,margin .3s ease;font-size:12px;line-height:1.8;color:#8fc9f5;text-align:left;}
.sm-step.is-active .sm-step-extra{max-height:140px;opacity:1;margin-top:12px;padding-top:10px;border-top:1px dashed rgba(79,195,247,.25);}
.sm-progress{height:4px;border-radius:2px;background:rgba(255,255,255,.10);margin-top:22px;overflow:hidden;}
.sm-progress-fill{height:100%;width:25%;border-radius:2px;background:linear-gradient(90deg,#4fc3f7,#48c9b0);transition:width .4s ease;}
.sm-flow-tip{text-align:center;font-size:12.5px;color:#7f9ab5;margin-top:14px;letter-spacing:.5px;}
.sm-flow-tip b{color:#4fc3f7;}

/* 05 工程要点 */
.sm-notes{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.sm-note{--ac:#0068b3;border-radius:14px;background:linear-gradient(135deg,#eef7fd,#dceefb);padding:26px;border-left:4px solid var(--ac);transition:transform .28s ease,box-shadow .28s ease;}
.sm-note[data-note="2"]{--ac:#16a085;background:linear-gradient(135deg,#eefaf8,#ddf3ef);}
.sm-note[data-note="3"]{--ac:#e67e22;background:linear-gradient(135deg,#fdf6ec,#f9ead2);}
.sm-note:hover{transform:translateY(-5px);box-shadow:0 14px 32px rgba(0,104,179,.14);}
.sm-note h3{margin:0 0 10px;font-size:15px;font-weight:700;color:var(--ac);}
.sm-note p{margin:0;font-size:13px;line-height:1.9;color:#4a5a6a;text-align:justify;}
.sm-close{background:linear-gradient(135deg,#0a1628,#0d3b66);border-radius:16px;padding:34px 40px;text-align:center;margin-top:36px;}
.sm-close p{font-size:14px;line-height:2;color:#b0c4de;margin:0 0 10px;}
.sm-close p strong{color:#4fc3f7;}
.sm-close-motto{font-size:13px;color:#4fc3f7;font-weight:600;letter-spacing:2px;}

/* 结尾 CTA */
.sm-cta{background:#fff;padding:64px 24px;}
.sm-cta-in{max-width:1100px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;background:linear-gradient(135deg,#0a1628,#0d3b66);border-radius:18px;padding:40px 48px;}
.sm-cta-t{font-size:24px;font-weight:700;color:#fff;margin:0 0 10px;}
.sm-cta-d{font-size:14px;color:#b0c4de;margin:0;line-height:1.7;max-width:560px;}
.sm-cta-btns{display:flex;gap:14px;flex-wrap:wrap;}
.sm-btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 30px;border-radius:999px;font-size:15px;font-weight:600;text-decoration:none;transition:all .25s ease;white-space:nowrap;}
.sm-btn-a{background:#4fc3f7;color:#06243a;}
.sm-btn-a:hover{background:#7fd6ff;transform:translateY(-2px);box-shadow:0 10px 26px rgba(79,195,247,.35);}
.sm-btn-b{border:1px solid rgba(255,255,255,.4);color:#fff;}
.sm-btn-b:hover{background:rgba(255,255,255,.12);border-color:#fff;transform:translateY(-2px);}

/* 进场动画（作用于主要区块与卡片；禁用 JS 即无 .sm-js，内容照常显示） */
.sm-js .sm-hero,
.sm-js .sm-intro,
.sm-js .sm-head,
.sm-js .sm-mech,
.sm-js .sm-edge,
.sm-js .sm-param,
.sm-js .sm-table-wrap,
.sm-js .sm-tip,
.sm-js .sm-step,
.sm-js .sm-progress,
.sm-js .sm-flow-tip,
.sm-js .sm-note,
.sm-js .sm-close,
.sm-js .sm-cta{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .6s cubic-bezier(.22,.61,.36,1),transform .6s cubic-bezier(.22,.61,.36,1);
  will-change:opacity,transform;
}
.sm-js .sm-hero.sm-in,
.sm-js .sm-intro.sm-in,
.sm-js .sm-head.sm-in,
.sm-js .sm-mech.sm-in,
.sm-js .sm-edge.sm-in,
.sm-js .sm-param.sm-in,
.sm-js .sm-table-wrap.sm-in,
.sm-js .sm-tip.sm-in,
.sm-js .sm-step.sm-in,
.sm-js .sm-progress.sm-in,
.sm-js .sm-flow-tip.sm-in,
.sm-js .sm-note.sm-in,
.sm-js .sm-close.sm-in,
.sm-js .sm-cta.sm-in{
  opacity:1;
  transform:none;
}
@media (prefers-reduced-motion: reduce){
  .sm-js .sm-hero,
  .sm-js .sm-intro,
  .sm-js .sm-head,
  .sm-js .sm-mech,
  .sm-js .sm-edge,
  .sm-js .sm-param,
  .sm-js .sm-table-wrap,
  .sm-js .sm-tip,
  .sm-js .sm-step,
  .sm-js .sm-progress,
  .sm-js .sm-flow-tip,
  .sm-js .sm-note,
  .sm-js .sm-close,
  .sm-js .sm-cta{
    opacity:1;
    transform:none;
    transition:none;
  }
}

@media (max-width:1024px){
  .sm-mechs,.sm-notes{grid-template-columns:1fr;}
  .sm-params{grid-template-columns:1fr;}
  .sm-steps{grid-template-columns:1fr 1fr;}
  .sm-hero h1{font-size:36px;}
  .sm-cta-in{flex-direction:column;align-items:flex-start;}
}
@media (max-width:600px){
  .sm-hero{padding:64px 0 56px;}
  .sm-hero h1{font-size:28px;}
  .sm-hero-sub{font-size:15px;}
  .sm-steps{grid-template-columns:1fr;}
  .sm-devs,.sm-devs-3{grid-template-columns:repeat(2,1fr);}
  .sm-close{padding:24px 20px;}
  .sm-edge-note{text-align:left;}
  .sm-cta-in{padding:28px 22px;}
  .sm-cta-t{font-size:20px;}
}