:root{--ink:#182f40;--muted:#637985;--blue:#146b94;--deep:#113d58;--line:#dbe5ea;--pale:#f5f8fa;--panel:#ffffff;--mint:#00a7a0}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#f7f9fa;color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Hiragino Sans",Meiryo,sans-serif;-webkit-font-smoothing:antialiased}button,input{font:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #20a6ce;outline-offset:3px} .shell{max-width:1450px;margin:0 auto;padding-left:clamp(22px,5.2vw,84px);padding-right:clamp(22px,5.2vw,84px)}.skip-link{position:absolute;z-index:100;left:12px;top:-60px;background:white;padding:12px;border-radius:8px}.skip-link:focus{top:12px}
.site-header{height:88px;display:flex;align-items:center;gap:46px;padding:0 clamp(22px,5.2vw,84px);border-bottom:1px solid #e5eaed;background:#fff;position:relative;z-index:3}.brand{display:inline-flex;gap:10px;align-items:center;font-size:18px;font-weight:850;letter-spacing:-.055em;white-space:nowrap}.brand-dot{color:var(--mint)}.brand-symbol{display:inline-flex;width:29px;height:29px;position:relative;align-items:center;justify-content:center}.brand-symbol span{position:absolute;display:block;width:21px;height:21px;border:2px solid #20678b;transform:rotate(30deg) skewY(-25deg) scale(.63);border-radius:2px}.brand-symbol span:nth-child(1){top:-1px}.brand-symbol span:nth-child(2){top:5px;left:2px;border-color:#28a0af}.brand-symbol span:nth-child(3){top:11px;left:4px;border-color:#aacbd3}.site-header nav{display:flex;align-items:center;gap:38px;margin-left:auto;font-size:12px;font-weight:650;letter-spacing:.02em}.site-header nav a{color:#71838b;white-space:nowrap}.site-header nav a:hover,.site-header nav .nav-current{color:var(--deep)}.header-version{font-size:10px;letter-spacing:.13em;font-weight:700;color:#9aabb2;border-left:1px solid #e5ecee;padding-left:28px;white-space:nowrap}
.hero{padding-top:76px;padding-bottom:74px}.hero-kicker{display:flex;align-items:center;gap:11px;color:var(--blue);font-weight:800;font-size:10px;letter-spacing:.16em}.pulse-dot{height:7px;width:7px;border-radius:50%;background:var(--mint);box-shadow:0 0 0 4px #d6f4f0}.hero-kicker-line{height:1px;width:20px;background:#b1c7d1}.hero h1{font-size:clamp(42px,6vw,90px);letter-spacing:-.078em;line-height:1.23;margin:24px 0 27px;font-weight:800}.heading-accent{color:var(--blue)}.hero-bottom{display:flex;justify-content:space-between;align-items:flex-end;gap:20px}.hero-bottom p{color:#6e818c;font-size:15px;line-height:2;margin:0}.hero-scroll{font-size:9px;letter-spacing:.14em;color:#98abb5;font-weight:750;display:flex;align-items:center;gap:16px}.hero-scroll span{font-size:23px;font-weight:300}
.explorer-section{scroll-margin-top:30px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:12px;margin-bottom:22px}.eyebrow{display:block;font-size:10px;letter-spacing:.15em;color:#177e9d;font-weight:850}.eyebrow-line{display:inline-block;width:26px;height:1px;vertical-align:middle;background:#8fc9d1;margin:0 7px}.section-heading h2{font-size:25px;margin:11px 0 0;letter-spacing:-.035em;font-weight:800}.section-heading-en{font-size:12px;font-weight:600;color:#9aaeb9;letter-spacing:.07em;margin-left:10px}.model-type{font-size:10px;letter-spacing:.09em;font-weight:780;color:#81949d;white-space:nowrap;padding-bottom:3px}.small-icon{font-size:17px;color:#2b99aa;margin-right:7px}
.explorer-grid{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:14px;align-items:stretch}.viewport-wrap{position:relative;overflow:hidden;border:1px solid #d9e6eb;border-radius:15px;background:radial-gradient(ellipse 60% 60% at 50% 48%,#fff 0%,#edf4f6 90%);min-height:675px;box-shadow:0 16px 40px rgba(19,63,84,.035)}.viewport-wrap:before{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(#dbe7ec66 1px,transparent 1px),linear-gradient(90deg,#dbe7ec66 1px,transparent 1px);background-size:38px 38px;mask-image:radial-gradient(ellipse 65% 65% at 50% 45%,#0005 0%,transparent 85%)}.canvas-top{position:absolute;inset:0 0 auto 0;display:flex;justify-content:space-between;padding:27px;z-index:1;pointer-events:none}.live-label{font-size:10px;letter-spacing:.1em;font-weight:820;color:#52798b}.live-mark{display:inline-block;width:7px;height:7px;border-radius:50%;background:#25a69c;margin-right:6px;box-shadow:0 0 0 3px #d3f2e9}.canvas-type{color:#8fa9b4;font-size:9px;letter-spacing:.08em;font-weight:700}.canvas-main{position:absolute;top:60px;bottom:175px;left:0;right:0;touch-action:none}.canvas-main canvas{width:100%;height:100%;display:block;cursor:grab;touch-action:none}.canvas-main canvas.dragging{cursor:grabbing}.canvas-main canvas.moving{cursor:move}.canvas-error{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;padding:40px;background:#eff4f6;color:#647b87;text-align:center;line-height:1.9}.canvas-error[hidden]{display:none}.canvas-hint{position:absolute;bottom:186px;left:0;right:0;pointer-events:none;color:#8097a1;text-align:center;font-size:11px;font-weight:580}.hint-dot{padding:0 6px;color:#bbcdd4}.view-controls{position:absolute;top:75px;right:19px;z-index:2;display:flex;gap:6px}.mini-btn{border:1px solid #e0e9ed;border-radius:8px;padding:8px 12px;background:#ffffffc9;font-size:11px;font-weight:680;color:#6c8793;backdrop-filter:blur(5px)}.mini-btn:hover{background:white;color:var(--deep)}.control-panel{position:absolute;bottom:0;left:0;right:0;min-height:163px;padding:19px 26px 22px;background:rgba(255,255,255,.9);border-top:1px solid #e1eaee;backdrop-filter:blur(14px)}.control-row{display:flex;align-items:center;justify-content:space-between}.control-name{display:block;font-size:13px;font-weight:780}.control-sublabel{font-size:9px;letter-spacing:.11em;color:#98a9b2}.control-value{color:var(--blue);font-size:20px;letter-spacing:-.045em;font-weight:800}.range-row{display:flex;gap:12px;align-items:center;margin:8px 0 18px}.range-edge{color:#94a8b0;font-weight:650;font-size:10px;white-space:nowrap}input[type=range]{flex:1;appearance:none;height:5px;border-radius:20px;outline:none;background:linear-gradient(to right,#207da3 0%,#207da3 var(--progress),#dfe7ec var(--progress),#dfe7ec 100%)}input[type=range]::-webkit-slider-thumb{appearance:none;background:white;border:3px solid #1781a1;width:17px;height:17px;border-radius:50%;box-shadow:0 2px 7px #93b1bc88;cursor:ew-resize}input[type=range]::-moz-range-thumb{background:white;border:3px solid #1781a1;width:13px;height:13px;border-radius:50%;cursor:ew-resize}.control-actions{display:flex;gap:7px}.action-btn{min-height:38px;display:flex;justify-content:center;align-items:center;gap:7px;padding:8px 13px;border:1px solid #dce7eb;border-radius:8px;background:#fff;color:#607784;font-size:11px;font-weight:750;white-space:nowrap}.action-btn:hover{border-color:#7ac5d5}.action-btn[aria-pressed=true]{background:#e8f6f8;color:#146b88;border-color:#86bfc9}.action-primary{background:#174a65;border-color:#174a65;color:#fff}.action-primary:hover{background:#0e374e;color:white}.icon-action{margin-left:auto;font-size:19px;padding:5px 13px}.details-panel{border:1px solid #e0e7ec;border-radius:15px;background:#fff;display:flex;flex-direction:column;min-height:675px;overflow:hidden}.details-top{display:flex;justify-content:space-between;align-items:center;padding:28px 26px 10px}.details-index{color:#a0b2bb;font-size:11px;font-weight:760;letter-spacing:.08em}.details-main{padding:24px 26px 28px;flex:1}.part-icon{height:65px;width:65px;border:1px solid #d3e6ec;background:#eef7fa;color:#177598;border-radius:17px;display:flex;align-items:center;justify-content:center;font-size:35px;margin-bottom:24px}.detail-kicker{font-size:9px;letter-spacing:.14em;color:#91a6b0;font-weight:850}.details-main h3{font-size:30px;letter-spacing:-.055em;margin:8px 0 4px}.part-en{font-size:10px;letter-spacing:.1em;font-weight:800;color:#3c96ac}.detail-description{font-size:13px;line-height:1.98;color:#617986;margin-top:25px;margin-bottom:26px}.detail-divider{height:1px;background:#e5edef}.detail-fact-label{margin-top:22px;font-size:10px;font-weight:830;color:#126783;letter-spacing:.06em}.detail-fact{font-size:12px;color:#637986;line-height:1.95;margin-bottom:0}.part-menu-header{display:flex;justify-content:space-between;padding:16px 19px 11px;border-top:1px solid #e9eff2;font-size:10px;font-weight:800;letter-spacing:.03em}.part-menu-header span:last-child{color:#a2b2ba;font-size:9px;letter-spacing:.06em}.part-list{padding:0 12px 13px;max-height:255px;overflow:auto;display:grid;grid-template-columns:1fr 1fr;gap:5px}.part-item{border:1px solid transparent;background:#f5f8fa;border-radius:7px;text-align:left;min-height:45px;padding:8px 9px;display:flex;align-items:center;gap:7px;color:#708693;font-size:11px;font-weight:750}.part-item .part-tiny{font-size:11px;color:#92aab4}.part-item.active{background:#e7f3f7;border:1px solid #c7e3e9;color:#135b78}.part-item.active .part-tiny{color:#2a91ae}.part-item:hover{border-color:#bedce6}.viewer-footnote{display:flex;justify-content:space-between;gap:20px;color:#9ab0bb;font-size:10px;padding:17px 2px}.footnote-dot{display:inline-block;width:5px;height:5px;background:#c1a46c;border-radius:50%;margin:0 8px 2px 2px}
.learning-section{display:grid;grid-template-columns:minmax(210px,.9fr) 1.3fr;gap:10%;padding-top:134px;padding-bottom:137px;scroll-margin-top:50px}.learn-left h2{font-size:clamp(39px,4vw,63px);line-height:1.28;letter-spacing:-.07em;margin:28px 0}.learn-left h2 span{color:#1d7a9b}.learn-left>p{font-size:14px;line-height:2;color:#70838e;max-width:320px}.steps{border-top:1px solid #d6e2e6}.step{display:flex;gap:24px;padding:34px 0;border-bottom:1px solid #d6e2e6;align-items:flex-start}.step-number{font-size:11px;letter-spacing:.05em;color:#1481a3;font-weight:850;margin-top:7px}.step-main{flex:1}.step-main h3{margin:0 0 10px;font-size:19px;letter-spacing:-.035em}.step-main p{font-size:13px;line-height:1.9;color:#70838e;margin:0}.step-symbol{font-weight:250;font-size:39px;color:#71b8c3;line-height:1}.next-section{padding-top:77px;padding-bottom:79px;background:#eef3f5;border-top:1px solid #e1eaed;display:flex;justify-content:space-between;align-items:center;gap:40px;max-width:none}.next-section>div:first-child{max-width:510px}.next-section h2{font-size:33px;letter-spacing:-.055em;margin:14px 0}.next-section h2 span{color:#1d789b}.next-section p{color:#768b95;font-size:13px;line-height:1.9}.next-chips{display:flex;flex-direction:column;gap:9px;min-width:270px}.next-chips>span{background:white;border:1px solid #e1e9ed;border-radius:10px;padding:15px 18px;font-size:13px;font-weight:750;display:flex;justify-content:space-between;gap:30px}.next-chips small{font-size:9px;color:#a2b2ba;font-weight:800;letter-spacing:.08em;white-space:nowrap}.site-footer{min-height:128px;display:flex;gap:30px;align-items:center;background:#fff;max-width:none}.footer-brand{font-size:15px}.footer-brand .brand-symbol{transform:scale(.8);margin-right:-3px}.site-footer>span{font-size:11px;color:#94aab5}.site-footer>span:last-child{margin-left:auto;font-size:10px;letter-spacing:.05em}
@media(max-width:1100px){.explorer-grid{grid-template-columns:minmax(0,1fr) 300px}.details-top,.details-main{padding-left:20px;padding-right:20px}.action-btn{padding:8px 10px;font-size:10px}}@media(max-width:850px){.site-header{height:70px}.site-header nav{gap:19px;font-size:11px}.header-version{display:none}.hero{padding-top:62px;padding-bottom:62px}.explorer-grid{grid-template-columns:1fr}.viewport-wrap{min-height:630px}.details-panel{min-height:0;display:grid;grid-template-columns:1fr 1fr;grid-template-rows:auto 1fr}.details-top{grid-column:1/-1;padding:22px 24px 0}.details-main{padding:17px 24px 26px}.part-icon{height:48px;width:48px;font-size:26px;margin-bottom:10px}.details-main h3{font-size:26px}.detail-description{margin-top:15px}.part-menu-header{grid-column:2;grid-row:2;border-top:0;align-self:start;padding-top:20px}.part-list{grid-column:2;grid-row:2;align-self:start;margin-top:60px;max-height:none}.learning-section{padding-top:90px;padding-bottom:90px;gap:6%}.next-section{gap:25px}}
@media(max-width:620px){.site-header{padding:0 20px}.brand{font-size:15px}.site-header nav{gap:16px;margin-left:auto}.site-header nav a:nth-child(n+2){display:none}.shell{padding-left:20px;padding-right:20px}.hero{padding-top:53px;padding-bottom:57px}.hero-kicker{font-size:8px;gap:7px;letter-spacing:.1em}.hero h1{font-size:clamp(41px,10vw,64px);margin:22px 0 25px}.hero-bottom{display:block}.hero-bottom p{font-size:13px;line-height:1.9}.hero-scroll{display:none}.section-heading{align-items:start}.section-heading h2{font-size:22px}.section-heading-en,.model-type{display:none}.explorer-grid{gap:11px}.viewport-wrap{min-height:590px}.canvas-top{padding:17px}.canvas-type{display:none}.canvas-main{top:45px;bottom:202px}.canvas-hint{bottom:211px;font-size:10px}.view-controls{top:52px;right:13px}.mini-btn{padding:7px 9px;font-size:10px}.control-panel{min-height:202px;padding:15px 15px 16px}.control-actions{display:grid;grid-template-columns:1fr 1fr 1fr auto;gap:5px}.action-btn{font-size:10px;padding:8px 6px;min-height:37px}.action-btn span[aria-hidden=true]{display:none}.icon-action{font-size:17px;padding:5px 10px}.range-row{margin-bottom:16px}.details-panel{display:flex}.details-top{padding:19px 18px 4px}.details-main{padding:8px 18px 22px}.detail-description{margin:12px 0 14px;font-size:12px}.detail-divider{display:none}.detail-fact-label{margin-top:13px}.part-icon{float:right}.part-menu-header{padding:14px 18px 11px;border-top:1px solid #edf0f2}.part-list{margin:0;padding:0 11px 13px}.viewer-footnote{font-size:10px;line-height:1.7}.viewer-footnote>span:last-child{display:none}.learning-section{display:block;padding-top:83px;padding-bottom:83px}.learn-left h2{font-size:43px;margin:16px 0}.learn-left p{margin-bottom:36px}.step{gap:15px;padding:25px 0}.step-main h3{font-size:17px}.step-main p{font-size:12px}.next-section{display:block;padding-top:54px;padding-bottom:60px}.next-section h2{font-size:26px}.next-chips{margin-top:28px;min-width:0}.site-footer{padding-top:23px;padding-bottom:23px;flex-wrap:wrap;gap:10px 20px}.site-footer>span:last-child{margin-left:0;width:100%}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}

.fallback-diagram{position:absolute;inset:5px 0 0;display:flex;align-items:center;justify-content:center;overflow:hidden}.fallback-diagram svg{width:100%;height:100%;max-width:980px;touch-action:none;overflow:visible;transition:transform .22s ease}.fallback-diagram .fb-part{cursor:pointer;transition:opacity .2s ease;transform-box:fill-box}.fallback-diagram .fb-part.selected{filter:drop-shadow(0 1px 2px rgba(32,158,184,.24))}.fallback-diagram .fb-part:hover{filter:drop-shadow(0 0 5px rgba(23,131,159,.38))}.fallback-diagram.drag-mode .fb-part{cursor:move}

/* Additional static search-friendly learning content */
.faq-section{padding-top:72px;padding-bottom:110px;background:#fff;border-top:1px solid #e6eef1}
.faq-intro h2{font-size:clamp(30px,3.2vw,44px);letter-spacing:-.05em;margin:14px 0 12px}
.faq-intro h2 span{color:#16779b}
.faq-intro p{color:#6c8290;font-size:14px;line-height:1.9;margin-bottom:34px}
.faq-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.faq-item{background:#f6f9fb;border:1px solid #e2ebf0;border-radius:14px;padding:26px 26px 24px}
.faq-item h3{font-size:17px;line-height:1.5;letter-spacing:-.03em;margin:0 0 14px}
.faq-item p{font-size:13px;line-height:1.95;color:#687f8b;margin:0}
.faq-note{font-size:11px;color:#8aa0aa;margin:24px 0 0;line-height:1.8}
@media(max-width:620px){.faq-section{padding-top:55px;padding-bottom:66px}.faq-list{grid-template-columns:1fr;gap:10px}.faq-item{padding:20px}.faq-item h3{font-size:16px}.faq-intro p{font-size:13px}}

/* High-detail viewer: clean photographic studio instead of technical grid. */
.viewport-wrap{background:radial-gradient(ellipse 70% 66% at 48% 38%,#ffffff 0%,#f5f8f9 60%,#e9eff2 100%)}
.viewport-wrap::before{background-image:none}
.canvas-main::before{content:"";position:absolute;left:22%;width:55%;height:9%;bottom:2%;border-radius:50%;background:radial-gradient(ellipse,rgba(54,83,91,.19),rgba(54,83,91,0) 75%);filter:blur(9px);pointer-events:none}

/* Non-blocking WebGL fallback notice */
.fallback-notice{position:absolute;top:8px;left:50%;transform:translateX(-50%);width:min(94%,560px);z-index:4;display:flex;align-items:center;justify-content:center;gap:12px;padding:8px 10px;border:1px solid #cadfe6;background:rgba(255,255,255,.92);box-shadow:0 3px 12px #345a6a0c;border-radius:9px;font-size:11px;color:#476475;text-align:center}
.fallback-notice button{flex-shrink:0;cursor:pointer;border:1px solid #b8d4df;border-radius:6px;background:#eaf4f7;color:#245c75;font-weight:700;font-size:11px;padding:7px 9px}
@media(max-width:620px){.fallback-notice{top:3px;flex-direction:column;gap:4px;font-size:10px;padding:6px}.fallback-notice button{font-size:10px;padding:4px 8px}}