:root{
  --abyss:#020b18;
  --abyss-mid:#06172b;
  --abyss-blue:#0a2d50;
  --current:#42c8ff;
  --current-soft:#9de6ff;
  --foam:#e8f8ff;
  --muted:#8ca7ba;
  --line:rgba(115,205,242,.22);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;overflow-x:hidden}
.abyss-home{min-height:100dvh;color:var(--foam);background:var(--abyss);font-family:"Microsoft YaHei UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.72}
.abyss-home a{color:inherit;text-decoration:none}
.abyss-home img{max-width:100%}
.abyss-shell{width:min(1220px,calc(100% - 56px));margin-inline:auto}
.abyss-header{position:fixed;inset:0 0 auto;z-index:50;border-bottom:1px solid var(--line);background:rgba(2,11,24,.72);backdrop-filter:blur(20px)}
.abyss-nav{min-height:76px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:32px}
.abyss-brand{display:inline-flex;align-items:center;gap:10px;width:max-content;font-size:20px;font-weight:900;letter-spacing:-.03em}
.abyss-brand img{display:block;width:32px;height:32px;object-fit:contain}
.abyss-nav-links{display:flex;align-items:center;gap:30px;color:#b1c6d5;font-size:13px;font-weight:700;white-space:nowrap}
.abyss-nav-links a{position:relative;padding-block:27px}
.abyss-nav-links a::after{content:"";position:absolute;left:50%;bottom:16px;width:4px;height:4px;border-radius:50%;background:var(--current);opacity:0;transform:translateX(-50%)}
.abyss-nav-links a:hover::after,.abyss-nav-links a[aria-current="page"]::after{opacity:1}
.abyss-nav-cta,.abyss-button{display:inline-flex;align-items:center;justify-content:space-between;gap:32px;min-width:174px;min-height:50px;padding:0 20px;border:1px solid var(--current);color:var(--foam);font-weight:800;white-space:nowrap;word-break:keep-all;writing-mode:horizontal-tb;transition:background .24s ease,color .24s ease,transform .24s ease}
.abyss-nav-cta{justify-self:end;min-width:130px;min-height:42px;font-size:13px}
.abyss-nav-cta:hover,.abyss-button:hover{background:var(--current);color:#00233b;transform:translateY(-2px)}
.abyss-home a:focus-visible,.abyss-home summary:focus-visible{outline:3px solid var(--current);outline-offset:4px}

.abyss-hero{position:relative;isolation:isolate;min-height:100svh;overflow:hidden;background:
  radial-gradient(circle at 50% 74%,rgba(31,164,221,.22),transparent 27%),
  linear-gradient(180deg,#071c32 0%,#041426 45%,#020b18 100%)}
.abyss-beams{position:absolute;inset:0;z-index:-2;background:
  linear-gradient(105deg,transparent 16%,rgba(101,213,255,.08) 29%,transparent 42%),
  linear-gradient(78deg,transparent 59%,rgba(101,213,255,.06) 70%,transparent 83%);
  clip-path:polygon(0 0,100% 0,86% 100%,14% 100%)}
.abyss-hero::before{content:"";position:absolute;inset:0;z-index:-1;opacity:.22;background-image:radial-gradient(circle,rgba(171,229,255,.45) 0 1px,transparent 1.5px);background-size:46px 46px;mask-image:linear-gradient(to bottom,#000,transparent 70%)}
.abyss-hero-stack{position:relative;min-height:100svh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:128px 0 54px;text-align:center}
.abyss-hero-copy{position:relative;z-index:4;display:flex;flex-direction:column;align-items:center}
.abyss-overline,.abyss-heading>p,.abyss-final>div>p{margin:0 0 20px;color:var(--current);font:700 11px/1.4 Consolas,monospace;letter-spacing:.2em}
.abyss-hero h1{max-width:9ch;margin:0;font-size:clamp(58px,8vw,112px);font-weight:700;line-height:.98;letter-spacing:-.07em;text-shadow:0 0 42px rgba(34,178,234,.18)}
.abyss-hero-copy>p:not(.abyss-overline){max-width:660px;margin:28px 0 0;color:#a7bfce;font-size:clamp(16px,1.45vw,19px)}
.abyss-actions{display:flex;align-items:center;gap:24px;margin-top:30px}
.abyss-ghost{padding:12px 0;border-bottom:1px solid var(--line);color:#c1d3de;font-size:14px;font-weight:800}
.abyss-sonar{position:relative;width:min(520px,58vw);margin-top:-18px;aspect-ratio:1;display:grid;place-items:center}
.abyss-sonar>i{position:absolute;border:1px solid rgba(89,204,249,.18);border-radius:50%}
.abyss-sonar>i:nth-child(1){inset:5%}.abyss-sonar>i:nth-child(2){inset:17%}.abyss-sonar>i:nth-child(3){inset:29%;border-style:dashed;animation:sonar-spin 28s linear infinite}
.abyss-sonar::before,.abyss-sonar::after{content:"";position:absolute;z-index:-1;background:var(--line)}
.abyss-sonar::before{width:120%;height:1px}.abyss-sonar::after{width:1px;height:120%}
.abyss-hero-device{position:relative;z-index:2;align-self:center;width:66%;height:auto;margin:0;padding:0;overflow:visible;transform:none;filter:drop-shadow(0 34px 46px rgba(0,0,0,.38))}
.abyss-hero-device img{display:block;width:100%;height:auto;min-height:0;max-height:none;margin:0;padding:0;object-fit:contain;object-position:center;clip-path:none;transform:none}
.abyss-status{position:absolute;left:50%;bottom:9%;z-index:3;display:flex;align-items:center;gap:10px;margin:0;padding:8px 15px;border:1px solid var(--line);background:rgba(2,14,28,.82);color:#b9d5e3;font-size:12px;transform:translateX(-50%);white-space:nowrap}
.abyss-status span{width:7px;height:7px;border-radius:50%;background:var(--current);box-shadow:0 0 12px var(--current)}
.abyss-platforms{margin:auto 0 0;color:#69889d;font:700 10px Consolas,monospace;letter-spacing:.14em}
.abyss-depth-scale{position:absolute;top:20%;right:26px;bottom:13%;z-index:3;display:flex;flex-direction:column;justify-content:space-between;padding-left:20px;border-left:1px solid var(--line);color:#65869b;font:700 10px Consolas,monospace;letter-spacing:.12em}
.abyss-depth-scale span::before{content:"";position:absolute;left:-7px;width:13px;height:1px;background:var(--current)}
@keyframes sonar-spin{to{transform:rotate(1turn)}}

.abyss-soundings{border-block:1px solid var(--line);background:#03101f}
.abyss-soundings-track{display:grid;grid-template-columns:repeat(4,1fr)}
.abyss-soundings p{display:flex;flex-direction:column;gap:8px;margin:0;padding:26px 28px;border-right:1px solid var(--line)}
.abyss-soundings p:first-child{border-left:1px solid var(--line)}
.abyss-soundings span{color:#6f90a5;font-size:11px;letter-spacing:.08em}
.abyss-soundings strong{font-size:clamp(19px,2vw,27px);font-weight:600}

.abyss-routes,.abyss-log{padding-block:clamp(110px,13vw,180px)}
.abyss-heading{display:grid;grid-template-columns:.42fr 1fr;gap:40px;align-items:start;margin-bottom:clamp(68px,9vw,110px)}
.abyss-heading h2,.abyss-layers h2,.abyss-devices h2,.abyss-faq h2,.abyss-final h2{margin:0;font-size:clamp(42px,5.6vw,76px);font-weight:600;line-height:1.08;letter-spacing:-.055em}
.abyss-route-map{position:relative;max-width:940px;margin-left:auto;padding-left:190px}
.abyss-route-line{position:absolute;left:47px;top:12px;bottom:12px;width:1px;background:linear-gradient(to bottom,transparent,var(--current) 12%,var(--current) 88%,transparent)}
.abyss-route-line i{position:absolute;left:-6px;width:13px;height:13px;border:2px solid var(--current);border-radius:50%;background:var(--abyss);box-shadow:0 0 0 9px rgba(66,200,255,.07)}
.abyss-route-line i:nth-child(1){top:4%}.abyss-route-line i:nth-child(2){top:34%}.abyss-route-line i:nth-child(3){top:64%}.abyss-route-line i:nth-child(4){bottom:4%}
.abyss-route-map article{display:grid;grid-template-columns:120px 1fr;gap:30px;padding:35px 0;border-top:1px solid var(--line)}
.abyss-route-map article:last-child{border-bottom:1px solid var(--line)}
.abyss-route-map article>span{color:var(--current);font:700 11px Consolas,monospace;letter-spacing:.15em}
.abyss-route-map h3{margin:0 0 8px;font-size:clamp(24px,3vw,38px);font-weight:600}
.abyss-route-map p{max-width:560px;margin:0;color:var(--muted)}

.abyss-layers{position:relative;padding-block:clamp(110px,14vw,190px);overflow:hidden;background:linear-gradient(180deg,#061a30 0%,#041426 52%,#020b18 100%)}
.abyss-layers::before{content:"";position:absolute;inset:0;opacity:.18;background:repeating-linear-gradient(to bottom,transparent 0 69px,rgba(108,207,245,.18) 70px)}
.abyss-layers .abyss-shell{position:relative}
.abyss-layers .abyss-heading{margin-bottom:70px}
.abyss-layer-stack{display:grid;gap:0}
.abyss-layer-stack article{display:grid;grid-template-columns:120px .75fr 1fr;gap:30px;align-items:center;padding:32px 4%;border-top:1px solid var(--line);background:rgba(6,31,55,.42)}
.abyss-layer-stack article:nth-child(2){margin-inline:7%;background:rgba(7,39,68,.5)}
.abyss-layer-stack article:nth-child(3){margin-inline:14%;border-bottom:1px solid var(--line);background:rgba(9,49,84,.58)}
.abyss-layer-stack small{color:var(--current);font:700 11px Consolas,monospace;letter-spacing:.14em}
.abyss-layer-stack h3{margin:0;font-size:clamp(22px,2.7vw,34px);font-weight:600}
.abyss-layer-stack p{margin:0;color:#91aabd}

.abyss-devices{padding-block:clamp(100px,13vw,180px);background:#03111f}
.abyss-device-stage{display:grid;grid-template-columns:.7fr 1.3fr;gap:clamp(48px,8vw,110px);align-items:center}
.abyss-device-stage header>p:not(.abyss-overline){margin:26px 0 30px;color:var(--muted)}
.abyss-device-stage figure{align-self:center;height:auto;margin:0;padding:0;overflow:visible;transform:none}
.abyss-device-stage figure img{display:block;width:100%;height:auto;min-height:0;max-height:none;margin:0;padding:0;object-fit:contain;object-position:center;clip-path:none;transform:none;filter:drop-shadow(0 36px 58px rgba(0,0,0,.34))}
.abyss-device-stage ul{grid-column:1/3;display:grid;grid-template-columns:repeat(5,1fr);margin:20px 0 0;padding:0;border-block:1px solid var(--line);list-style:none}
.abyss-device-stage li{padding:17px 12px;border-right:1px solid var(--line);color:#a8c1d1;text-align:center;font:700 12px Consolas,monospace}
.abyss-device-stage li:first-child{border-left:1px solid var(--line)}

.abyss-log{display:grid;grid-template-columns:.75fr 1.25fr;gap:clamp(50px,9vw,130px)}
.abyss-log .abyss-heading{display:block;margin:0}.abyss-log .abyss-heading>p{margin-bottom:24px}
.abyss-logbook{border-top:1px solid var(--line)}
.abyss-logbook article{display:grid;grid-template-columns:90px 1fr;gap:10px 24px;padding:30px 0;border-bottom:1px solid var(--line)}
.abyss-logbook time{grid-row:1/3;color:var(--current);font:700 11px Consolas,monospace;letter-spacing:.15em}
.abyss-logbook h3{margin:0;font-size:clamp(20px,2.3vw,29px);font-weight:600}
.abyss-logbook p{grid-column:2;margin:0;color:var(--muted)}

.abyss-faq{padding-block:clamp(100px,12vw,165px);border-block:1px solid var(--line);background:#06172b}
.abyss-faq-grid{display:grid;grid-template-columns:.75fr 1.25fr;gap:clamp(50px,9vw,130px)}
.abyss-faq header>a{display:inline-block;margin-top:30px;color:var(--current);font-weight:800}
.abyss-faq details{padding:0;border:0;border-top:1px solid var(--line);background:transparent}
.abyss-faq details:last-child{border-bottom:1px solid var(--line)}
.abyss-faq summary{position:relative;padding:25px 44px 25px 0;cursor:pointer;list-style:none;font-weight:800}
.abyss-faq summary::after{content:"○";position:absolute;right:0;color:var(--current)}
.abyss-faq details[open] summary::after{content:"●"}
.abyss-faq details p{margin:0 0 26px;color:#91aabd}

.abyss-final{padding-block:clamp(90px,11vw,145px);text-align:center;background:
  radial-gradient(circle at 50% 100%,rgba(66,200,255,.22),transparent 45%),
  #020b18}
.abyss-final .abyss-shell{display:flex;flex-direction:column;align-items:center}
.abyss-final h2{max-width:16ch}
.abyss-final .abyss-button{margin-top:36px}
.abyss-button-light{background:var(--foam);border-color:var(--foam);color:#03213a}

.abyss-footer{padding:58px 0 28px;border-top:1px solid var(--line);background:#010711}
.abyss-footer-grid{display:grid;grid-template-columns:1.4fr .5fr .5fr;gap:50px}
.abyss-footer p{max-width:440px;color:#6f8a9c}
.abyss-footer nav{display:flex;flex-direction:column;gap:8px}
.abyss-footer nav strong{margin-bottom:8px}.abyss-footer nav a{color:#829bac}
.abyss-copyright{grid-column:1/4;max-width:none!important;margin:22px 0 0!important;padding-top:22px;border-top:1px solid var(--line);font-size:12px}

@media(max-width:900px){
  .abyss-nav{grid-template-columns:1fr auto}.abyss-nav-links{grid-column:1/3;grid-row:2;justify-content:space-between;overflow-x:auto;border-top:1px solid var(--line)}.abyss-nav-links a{padding-block:12px}.abyss-nav-links a::after{bottom:4px}.abyss-nav-cta{grid-column:2;grid-row:1}
  .abyss-hero-stack{padding-top:154px}.abyss-depth-scale{display:none}.abyss-sonar{width:min(600px,88vw)}
  .abyss-soundings-track{grid-template-columns:1fr 1fr}.abyss-soundings p:nth-child(2){border-right:1px solid var(--line)}
  .abyss-heading{grid-template-columns:1fr;gap:24px}.abyss-route-map{padding-left:110px}.abyss-route-line{left:28px}
  .abyss-device-stage,.abyss-log,.abyss-faq-grid{grid-template-columns:1fr}.abyss-device-stage ul{grid-column:1}.abyss-log .abyss-heading{margin-bottom:60px}
  .abyss-footer-grid{grid-template-columns:1fr 1fr}.abyss-footer-grid>div{grid-column:1/3}.abyss-copyright{grid-column:1/3}
}
@media(max-width:640px){
  html,.abyss-home{max-width:100%;overflow-x:clip}.abyss-shell{width:min(100% - 24px,1220px)}.abyss-header{position:absolute}.abyss-nav{gap:12px;padding-top:12px}.abyss-nav-links{gap:24px;justify-content:flex-start}.abyss-nav-cta{min-width:112px;padding-inline:14px}
  .abyss-hero-stack{padding-top:165px}.abyss-hero h1{font-size:clamp(50px,17vw,72px)}.abyss-actions{display:grid;width:100%;gap:16px}.abyss-button{width:100%}.abyss-sonar{width:100%;margin-top:8px}.abyss-hero-device{width:75%}.abyss-status{bottom:4%}.abyss-platforms{line-height:1.8}
  .abyss-soundings p{padding:18px 14px}.abyss-soundings strong{font-size:18px}
  .abyss-routes,.abyss-log{padding-block:90px}.abyss-heading h2,.abyss-layers h2,.abyss-devices h2,.abyss-faq h2,.abyss-final h2{font-size:clamp(38px,12vw,54px)}
  .abyss-route-map{padding-left:46px}.abyss-route-line{left:8px}.abyss-route-map article{grid-template-columns:1fr;gap:10px}
  .abyss-layer-stack article,.abyss-layer-stack article:nth-child(n){grid-template-columns:1fr;gap:10px;margin-inline:0;padding:26px 18px}.abyss-device-stage{gap:54px}.abyss-device-stage ul{grid-template-columns:1fr}.abyss-device-stage li,.abyss-device-stage li:first-child{border-left:1px solid var(--line);border-bottom:1px solid var(--line)}
  .abyss-logbook article{grid-template-columns:62px 1fr;gap:10px 14px}.abyss-footer-grid{grid-template-columns:1fr 1fr;gap:38px 24px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.abyss-sonar>i{animation:none}.abyss-nav-cta,.abyss-button{transition:none}}