:root{--bg:#06111d;--panel:#071522;--panel-2:#081925;--ink:#f3f8fb;--muted:#879cad;--line:rgba(139,185,221,.17);--cyan:#22d3ee;--steel:#b4cfdf;color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-width:320px;overflow-x:clip;padding-right:env(safe-area-inset-right);padding-bottom:env(safe-area-inset-bottom);padding-left:env(safe-area-inset-left);color:var(--ink);background:var(--bg);font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;font-size:16px;line-height:1.65}a{color:inherit}button{font:inherit}.shell{width:min(1380px,calc(100% - 48px));margin-inline:auto}
.concept-header{height:78px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid rgba(169,207,239,.12)}.concept-brand{display:inline-flex;min-height:48px;align-items:center;gap:12px;color:#f4f8fb;font-size:.96rem;font-weight:780;letter-spacing:.035em;text-decoration:none}.concept-brand img{width:44px;height:44px;border-radius:11px;object-fit:cover;box-shadow:0 0 0 1px rgba(211,235,252,.14)}.concept-nav{display:flex;min-width:0;align-items:center;gap:4px;overflow-x:auto;scrollbar-width:none}.concept-nav::-webkit-scrollbar{display:none}.concept-nav a{display:inline-flex;min-height:44px;flex:0 0 auto;align-items:center;padding:7px 12px;color:#6d8294;font-size:.77rem;font-weight:680;text-decoration:none}.concept-nav a:hover,.concept-nav a[aria-current=page]{color:#e9fbff}.concept-nav a[aria-current=page]::before{content:"";width:5px;height:5px;margin-right:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
.concept-main{padding:42px 0 86px}.concept-intro{display:grid;grid-template-columns:.66fr 1.34fr;gap:48px;align-items:end;margin-bottom:24px}.concept-eyebrow{color:#70dce7;font-size:.7rem;font-weight:760;letter-spacing:.15em;text-transform:uppercase}.concept-intro h1{margin:7px 0 0;font-size:clamp(3.2rem,7vw,5.9rem);line-height:.92;letter-spacing:-.065em}.concept-intro h1 span{margin-left:12px;color:#7890a3;font-size:clamp(.96rem,1.7vw,1.24rem);font-weight:560;letter-spacing:.02em}.concept-thesis{max-width:820px;margin:0 0 5px;color:#aebdca;font-size:clamp(1rem,1.7vw,1.22rem)}.concept-thesis strong{color:#eefcff;font-weight:720}
.concept-card{overflow:hidden;border:1px solid rgba(139,185,221,.22);border-radius:4px;background:#061827;box-shadow:0 30px 80px rgba(0,0,0,.25)}.concept-visual{position:relative;isolation:isolate;aspect-ratio:1199/675;overflow:hidden;background:#061827}.concept-image{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.concept-image-base{z-index:1;transition:filter .3s ease}.component-highlight{z-index:2;opacity:0;pointer-events:none;filter:brightness(1.3) saturate(1.1) drop-shadow(0 0 8px rgba(34,211,238,.28));-webkit-mask-image:radial-gradient(ellipse var(--hl-rx) var(--hl-ry) at var(--hl-x) var(--hl-y),#000 0 58%,rgba(0,0,0,.82) 72%,transparent 100%);mask-image:radial-gradient(ellipse var(--hl-rx) var(--hl-ry) at var(--hl-x) var(--hl-y),#000 0 58%,rgba(0,0,0,.82) 72%,transparent 100%);transition:opacity .28s ease}.concept-visual[data-stage="0"] .component-0,.concept-visual[data-stage="1"] .component-1,.concept-visual[data-stage="2"] .component-2,.concept-visual[data-stage="3"] .component-3{opacity:1}.concept-visual[data-stage] .concept-image-base{filter:brightness(.62) saturate(.7)}
.signal-overlay{position:absolute;z-index:3;inset:0;width:100%;height:100%;pointer-events:none;mix-blend-mode:screen}.signal-line{fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-width:4.5;stroke-dasharray:12 15;opacity:.16;animation:conceptFlow 1.05s linear infinite;transition:opacity .24s ease,stroke-width .24s ease}.signal-line.electric{stroke:var(--steel);filter:url(#electricGlow)}.signal-line.control{stroke:#f4b84a;filter:url(#electricGlow)}.signal-line.network{stroke:#8d86ff;filter:url(#cyanGlow)}.signal-line.optical,.signal-line.laser{stroke:var(--cyan);filter:url(#cyanGlow)}.signal-line.laser{stroke-width:4;stroke-dasharray:9 13}.concept-visual[data-stage="0"] .stage-0,.concept-visual[data-stage="1"] .stage-1,.concept-visual[data-stage="2"] .stage-2,.concept-visual[data-stage="3"] .stage-3{opacity:.95;stroke-width:6}.signal-dot{filter:url(#dotGlow)}@keyframes conceptFlow{to{stroke-dashoffset:-27}}
.component-hotspot{position:absolute;z-index:4;border:0;outline:0;color:inherit;background:transparent;cursor:pointer}.component-hotspot span{position:absolute;left:50%;top:50%;padding:6px 9px;border:1px solid rgba(78,213,231,.32);border-radius:3px;color:#dcfbff;background:rgba(3,20,33,.88);font-size:.67rem;font-weight:720;white-space:nowrap;opacity:0;transform:translate(-50%,-35%);transition:opacity .2s ease,transform .2s ease}.component-hotspot:hover span,.component-hotspot:focus-visible span,.component-hotspot.is-active span{opacity:1;transform:translate(-50%,-50%)}.component-hotspot:focus-visible span{box-shadow:0 0 0 2px rgba(34,211,238,.65)}
.concept-story{display:grid;grid-template-columns:minmax(250px,.72fr) minmax(620px,1.6fr);gap:30px;padding:22px 24px 25px;border-top:1px solid var(--line);background:#07131f}.story-copy{display:grid;grid-template-columns:34px 1fr;gap:14px;align-content:start}.story-num{display:grid;place-items:center;width:34px;height:34px;border:1px solid rgba(34,211,238,.42);border-radius:50%;color:var(--cyan);font-size:.73rem;font-weight:800}.story-kicker{color:#68cbd7;font-size:.66rem;font-weight:760;letter-spacing:.12em;text-transform:uppercase}.story-copy h2{margin:3px 0 5px;font-size:1.22rem;line-height:1.3}.story-copy p{margin:0;color:#8296a7;font-size:.84rem}.step-nav{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;align-self:center}.concept-step{position:relative;min-height:76px;padding:11px 12px;border:1px solid rgba(139,185,221,.15);border-radius:3px;color:#708598;background:#081722;text-align:left;cursor:pointer;transition:border-color .2s ease,background .2s ease,color .2s ease}.concept-step:hover,.concept-step.is-active,.concept-step:focus-visible{color:#ecfbff;border-color:rgba(34,211,238,.43);background:rgba(34,211,238,.055);outline:0}.concept-step::after{content:"";position:absolute;left:0;right:100%;bottom:0;height:2px;background:var(--cyan)}.concept-step.is-active::after{animation:stepProgress 3.4s linear forwards}.concept-step small{display:block;color:inherit;opacity:.65;font-size:.63rem}.concept-step b{display:block;margin-top:5px;font-size:.82rem}@keyframes stepProgress{to{right:0}}
.core-note{display:grid;grid-template-columns:130px 1fr;gap:20px;align-items:center;width:min(1050px,100%);margin:38px auto 0;padding:18px 20px;border:1px solid rgba(34,211,238,.18);background:#071722}.core-note strong{color:#7edce6;font-size:.69rem;letter-spacing:.12em}.core-note p{margin:0;color:#aebdca}.core-note b{color:#fff}
.details-wrap{width:min(1050px,100%);margin:48px auto 0}.details-heading{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:14px}.details-heading h2{margin:0;font-size:clamp(1.5rem,3vw,2.1rem);letter-spacing:-.035em}.details-heading p{margin:0;color:#607588;font-size:.8rem}.details-wrap details{border-top:1px solid var(--line)}.details-wrap details:last-of-type{border-bottom:1px solid var(--line)}.details-wrap summary{display:grid;grid-template-columns:38px 1fr auto;gap:13px;align-items:center;padding:20px 3px;cursor:pointer;list-style:none;font-weight:680}.details-wrap summary::-webkit-details-marker{display:none}.details-wrap summary span:first-child{color:#587084;font-size:.7rem}.details-wrap summary::after{content:"+";color:var(--cyan);font-size:1.2rem;font-weight:400;transition:transform .2s ease}.details-wrap details[open] summary::after{transform:rotate(45deg)}.detail-body{padding:0 54px 23px;color:#8397a8}.detail-body p{margin:0}.detail-body strong{color:#dbe9f2}.compare{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.compare div{padding:14px;border:1px solid rgba(139,185,221,.14);background:#071522}.compare b{display:block;margin-bottom:4px;color:#eef7fb}.compare span{font-size:.82rem}
.concept-footer{display:flex;justify-content:space-between;gap:20px;padding:34px 0 38px;border-top:1px solid rgba(139,185,221,.12);color:#536b7d;font-size:.72rem}.concept-footer a{text-underline-offset:3px}
@media(max-width:900px){.concept-intro{grid-template-columns:1fr;gap:14px}.concept-story{grid-template-columns:1fr}.step-nav{align-self:auto}.core-note{grid-template-columns:1fr;gap:5px}}
@media(max-width:620px){.shell{width:min(100% - 24px,1380px)}.concept-header{height:66px}.concept-brand span{display:none}.concept-brand img{width:40px;height:40px}.concept-nav a{padding:6px 8px;font-size:.72rem}.concept-main{padding-top:28px}.concept-intro h1 span{display:block;margin:8px 0 0}.concept-card{margin-inline:-12px;border-left:0;border-right:0}.concept-story{padding:19px 16px}.step-nav{display:flex;overflow-x:auto;scrollbar-width:none}.step-nav::-webkit-scrollbar{display:none}.concept-step{flex:0 0 132px}.component-hotspot span{display:none}.details-heading{display:block}.details-heading p{margin-top:4px}.details-wrap summary{grid-template-columns:30px 1fr auto}.detail-body{padding-left:46px}.compare{grid-template-columns:1fr}.concept-footer{flex-direction:column}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.signal-line,.signal-dot,.concept-step.is-active::after{animation:none}.concept-image-base,.component-highlight,.component-hotspot span,.concept-step,.details-wrap summary::after{transition:none}.signal-dot{display:none}}