:root{--door-cyan:#08bff5;--door-gold:#e5bd70;--door-bg:#001b29;--door-panel:#062d40;--door-line:rgba(84,199,237,.24)}
*{box-sizing:border-box}.door-system-page{background:var(--door-bg);color:#f5fbff}.door-system-page em{font-style:normal;color:var(--door-cyan)}
.door-system-page .system-breadcrumbs{position:relative;z-index:5}.door-system-hero{position:relative;height:calc(100vh - 126px);min-height:620px;max-height:760px;display:grid;grid-template-columns:.92fr 1.08fr;overflow:hidden;background:linear-gradient(125deg,#001824,#06364b)}
.door-system-copy{min-width:0;padding:clamp(65px,7vw,105px) clamp(28px,7vw,110px) 125px;display:flex;flex-direction:column;justify-content:center;position:relative;z-index:2}.door-system-copy h1{font-size:clamp(46px,5vw,76px);line-height:.96;letter-spacing:-.055em;margin:14px 0 20px}.door-system-copy>p:not(.eyebrow){max-width:610px;color:#b9d0da;line-height:1.65;font-size:16px;margin:0}.door-system-copy .actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}
.door-system-art{position:relative;background:radial-gradient(circle at 50% 45%,#dfe9e8,#7f989b)}.door-system-art:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,#001b29 0,transparent 28%)}.door-system-art img{width:100%;height:100%;object-fit:cover}
.door-specs{position:absolute;z-index:3;left:clamp(28px,7vw,110px);right:clamp(28px,7vw,110px);bottom:28px;display:grid;grid-template-columns:repeat(4,1fr);background:rgba(0,25,39,.88);border:1px solid var(--door-line);backdrop-filter:blur(10px)}.door-specs span{padding:17px 20px;border-right:1px solid rgba(255,255,255,.1);color:#86a8b6;font-size:10px;text-transform:uppercase;letter-spacing:.08em}.door-specs span:last-child{border:0}.door-specs b{display:block;color:#fff;font-size:17px;text-transform:none;letter-spacing:0;margin-bottom:4px}
.door-local-nav{position:sticky;top:0;z-index:20;display:flex;justify-content:center;gap:clamp(18px,4vw,55px);padding:18px 25px;background:rgba(0,25,39,.96);border-bottom:1px solid var(--door-line);backdrop-filter:blur(12px)}.door-local-nav a{color:#a9c1cb;text-decoration:none;text-transform:uppercase;font-size:12px;letter-spacing:.06em;position:relative}.door-local-nav a:after{content:"";position:absolute;left:0;right:100%;bottom:-8px;height:2px;background:var(--door-cyan);transition:.25s}.door-local-nav a:hover:after,.door-local-nav a.is-active:after{right:0}.door-local-nav .catalog-link{color:var(--door-gold)}
.door-system-page .section{padding-top:88px;padding-bottom:88px}.door-intro{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(45px,8vw,120px)}.door-intro h2,.system-visual h2,.door-next h2{font-size:clamp(39px,4.7vw,70px);line-height:1.02;letter-spacing:-.045em;margin:12px 0}.door-intro>div:last-child>p{color:#acc6d0;line-height:1.8}
.door-feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px;margin-top:34px}.door-feature-grid article{min-height:260px;padding:27px;background:linear-gradient(180deg,#07364e,#032438);border:1px solid var(--door-line);transition:.24s}.door-feature-grid article:hover{transform:translateY(-4px);border-color:var(--door-gold)}.door-feature-grid svg{width:52px;height:52px;fill:none;stroke:#e0edf1;stroke-width:2}.door-feature-grid span{display:block;color:var(--door-cyan);font-size:10px;letter-spacing:.13em;text-transform:uppercase;margin:18px 0 10px}.door-feature-grid h3{font-size:24px;margin:0 0 12px}.door-feature-grid p{color:#9db8c4;font-size:14px;line-height:1.65}
.system-visual{background:#06283a}.system-visual-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(35px,7vw,100px);align-items:center}.system-visual figure{margin:0;min-height:520px;background:radial-gradient(circle,#eef2ef,#a8babb);overflow:hidden;border:1px solid var(--door-line)}.system-visual img{display:block;width:100%;height:520px;object-fit:contain}.system-visual p{color:#abc4ce;line-height:1.75}.system-visual ul{list-style:none;padding:0;margin:25px 0}.system-visual li{padding:14px 0;border-bottom:1px solid rgba(255,255,255,.09)}.system-visual li b{color:var(--door-gold);margin-right:8px}
.door-next{display:grid;grid-template-columns:1fr 1fr;gap:35px;align-items:center}.door-next p{color:#aac3cd;line-height:1.75}.door-next-actions{display:grid;gap:12px}.door-next-actions a{min-height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 24px;border:1px solid var(--door-line);color:#eef8fb;text-decoration:none;background:#052b3e;transition:.25s}.door-next-actions a:hover{transform:translateY(-2px);border-color:var(--door-gold)}.door-next-actions a:first-child{background:var(--door-gold);color:#082233;font-weight:800}
.system-switch{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--door-line);border-bottom:1px solid var(--door-line)}.system-switch a{padding:25px;color:#9bb8c4;text-decoration:none;border-right:1px solid var(--door-line)}.system-switch a:last-child{border:0}.system-switch a strong{display:block;color:#fff;margin-top:6px}.system-switch a.is-current{background:#08374d}.system-switch a:hover strong{color:var(--door-gold)}
@media(max-width:900px){.door-system-hero{grid-template-columns:1fr;height:auto;min-height:0;max-height:none}.door-system-copy{min-height:590px;padding-bottom:155px}.door-system-art{height:520px}.door-specs{grid-template-columns:1fr 1fr}.door-intro,.system-visual-grid,.door-next{grid-template-columns:1fr}.door-feature-grid,.system-switch{grid-template-columns:1fr 1fr}.door-local-nav{justify-content:flex-start;overflow-x:auto;white-space:nowrap}.system-visual figure,.system-visual img{height:430px;min-height:430px}}
@media(max-width:600px){.door-system-copy h1{font-size:48px}.door-system-copy{min-height:610px}.door-system-art{height:420px}.door-specs{left:18px;right:18px;bottom:18px}.door-specs span{padding:12px}.door-feature-grid,.system-switch{grid-template-columns:1fr}.door-next-actions a{min-height:64px}.door-system-page .section{padding-top:64px;padding-bottom:64px}}

/* AP05: retain the existing mobile layout; fit feature cards before desktop overflow. */
@media (min-width:901px) and (max-width:1279px){
  .door-intro > div:last-child > .door-feature-grid{grid-template-columns:repeat(2,1fr)}
}