:root{--red:#9f0606;--red-bright:#c21a1e;--ink:#1d252b;--muted:#65717a;--paper:#fff;--pale:#f3f5f6;--line:#dfe4e7;--max:1190px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:#fff;font:15px/1.65 Arial,Helvetica,'Microsoft YaHei',sans-serif}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}button:disabled{cursor:not-allowed}.wrap{max-width:var(--max);width:calc(100% - 48px);margin:auto}.skip{position:absolute;top:-200px;left:10px;background:#fff;padding:10px;z-index:40}.skip:focus{top:8px}.preview-ribbon{background:#292d30;color:#f3eee7;text-align:center;font-size:10px;letter-spacing:.13em;padding:8px 10px;font-weight:700}.preview-ribbon span{color:#aebac0}.contact-strip{background:#f4f5f6;border-bottom:1px solid #e7e9eb}.contact-strip .wrap{display:flex;justify-content:space-between;gap:20px;font-size:11px;color:#737c83;padding:7px 0}.masthead{min-height:91px;display:flex;align-items:center;gap:27px}.logo{display:flex;align-items:baseline;gap:12px}.logo b{font-style:italic;font-size:48px;font-weight:900;line-height:1;letter-spacing:-.08em;color:var(--red)}.logo span{font-size:12px;letter-spacing:.26em;font-weight:bold}.nav-desktop{margin-left:auto;display:flex;gap:22px}.nav-desktop a{font-size:12px;font-weight:700}.nav-desktop a:hover{color:var(--red)}.top-cta{white-space:nowrap;background:var(--red);color:#fff;font-weight:700;font-size:12px;padding:13px 16px}.top-cta span{margin-left:9px}.top-cta:hover{background:#730303}.nav-mobile,#menu-toggle{display:none}.hero{position:relative;min-height:660px;background:#161b1f;color:#fff;display:flex;align-items:center;overflow:hidden}.hero-media,.hero-poster,.hero-video,.hero-overlay{position:absolute;inset:0;width:100%;height:100%}.hero-poster img{display:block;width:100%;height:100%;object-fit:cover;object-position:center;transition:opacity .4s;opacity:1}.hero-poster.poster-hidden img{opacity:0}.hero-video{object-fit:cover;object-position:center;opacity:0;transition:opacity .4s}.hero-video.video-visible{opacity:1}.hero-overlay{pointer-events:none;background:linear-gradient(90deg,rgba(7,13,18,.92),rgba(7,13,18,.74) 43%,rgba(7,13,18,.33) 82%),linear-gradient(0deg,rgba(0,0,0,.28),transparent 36%)}.hero-layout{position:relative;z-index:2;padding:80px 0 88px}.hero-copy{max-width:790px}.kicker{color:var(--red);font-size:11px;letter-spacing:.16em;font-weight:800}.hero-kicker{color:#d3e0e4;font-size:12px}.bar{display:inline-block;width:25px;height:2px;background:#dc2c30;vertical-align:middle;margin-right:10px}.hero h1{font-size:clamp(40px,5.2vw,68px);line-height:1.08;letter-spacing:-.04em;font-weight:850;text-wrap:balance;margin:25px 0 23px}.hero-subtitle{font-size:clamp(14px,1.5vw,19px);font-weight:bold;line-height:1.6;color:#fff;max-width:680px}.hero-subtitle i{font-style:normal;color:#ef6c67;margin:0 7px}.hero-description{color:#d1d9dc;font-size:15px;max-width:580px}.hero-actions{margin-top:35px;display:flex;gap:14px;flex-wrap:wrap}.btn{font-size:13px;font-weight:bold;padding:13px 19px;display:inline-flex;align-items:center;gap:18px;justify-content:center;min-height:49px}.btn-red{background:#ad090c;color:#fff}.btn-ghost{border:1px solid rgba(255,255,255,.75);color:#fff}.btn-red:hover{background:#820306}.btn:hover,.btn:focus-visible{outline:2px solid #fff;outline-offset:2px}.hero-media-status{position:absolute;z-index:3;left:24px;bottom:17px;color:#d1d8dc;font-size:10px;letter-spacing:.04em}.status-dot{display:inline-block;background:#a0c4c6;border-radius:50%;width:6px;height:6px;margin-right:5px}.motion-control{position:absolute;z-index:3;right:24px;bottom:14px;background:rgba(0,0,0,.56);color:#fff;border:1px solid #a6b0b5;padding:7px 10px;font-size:10px}.motion-control[hidden]{display:none}.section{padding:94px 0}.section-soft{background:var(--pale)}.heading{max-width:820px;margin-bottom:37px}.section h2{font-size:clamp(30px,3.4vw,45px);font-weight:800;letter-spacing:-.03em;line-height:1.14;margin:14px 0 20px}.section-lead{max-width:720px;font-size:16px;color:var(--muted);margin:0}.cap-grid{display:grid;grid-template-columns:1.15fr 1fr 1fr;gap:17px}.cap{min-height:360px;border:1px solid #e0e4e7;padding:26px;position:relative;overflow:hidden}.cap.primary{border-top:4px solid var(--red)}.cap-number{font-size:11px;color:var(--red);font-weight:800;letter-spacing:.09em}.cap h3{font-size:21px;margin:14px 0 7px}.cap p{color:var(--muted);font-size:13px;min-height:67px}.cap a{font-weight:bold;color:#9d0606;font-size:12px}.cap-visual{height:105px;margin-top:13px;position:relative;background:repeating-linear-gradient(0deg,#e8edf0,#e8edf0 1px,transparent 1px,transparent 20px),repeating-linear-gradient(90deg,#e8edf0,#e8edf0 1px,transparent 1px,transparent 20px);overflow:hidden}.ring{position:absolute;border:10px solid #89949d;border-radius:50%;width:90px;height:90px;top:8px;left:38%}.ring-two{width:55px;height:55px;top:26px;left:47%;border-width:7px;border-color:#bec6ca}.arm{position:absolute;width:95px;height:30px;background:#49565f;top:40px;left:24%;transform:rotate(-24deg);border-radius:8px}.hose-path{position:absolute;inset:22px 40px;border:9px solid #63717c;border-right-color:transparent;border-bottom-left-radius:65px;border-top-left-radius:55px}.other-visual{display:flex;align-items:flex-end;gap:13px;padding:23px 38px}.other-visual span{display:block;width:18px;height:55px;background:#76848e;transform:skewX(-14deg)}.other-visual span:nth-child(2){height:75px;background:#acb5bd}.process-grid{display:grid;grid-template-columns:repeat(4,1fr);border-block:1px solid #d9dee1}.process-grid article{padding:28px 18px;border-right:1px solid #d9dee1}.process-grid article:last-child{border-right:0}.process-grid article>span{font-size:32px;font-weight:bold;color:var(--red)}.process-grid h3{font-size:17px;margin:14px 0 6px}.process-grid p{color:var(--muted);font-size:13px}.text-link{display:inline-block;color:var(--red);font-weight:bold;font-size:13px;margin-top:25px}.split{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}.engineering-diagram{height:360px;background:#24303a;position:relative;display:grid;place-items:center;overflow:hidden}.engineering-diagram::before{content:'';position:absolute;inset:0;background:repeating-linear-gradient(0deg,transparent,transparent 24px,rgba(255,255,255,.035) 25px),repeating-linear-gradient(90deg,transparent,transparent 24px,rgba(255,255,255,.035) 25px)}.diagram-ring{position:absolute;width:240px;height:240px;border:1px solid #a1b0bb;border-radius:50%;box-shadow:0 0 0 30px rgba(255,255,255,.03),0 0 0 70px rgba(255,255,255,.02)}.diagram-core{position:relative;color:#fff;text-align:center;font-size:15px;letter-spacing:.17em}.diagram-core b{font-size:19px}.diagram-tag{position:absolute;color:#d0dadd;font-size:10px;font-weight:bold;letter-spacing:.13em}.t1{top:38px;left:38px}.t2{bottom:38px;left:38px}.t3{top:38px;right:38px}.diagram-note{position:absolute;bottom:12px;right:15px;font-size:9px;color:#b9c4cb}.evidence{background:#212a31;color:#fff}.evidence-layout{display:grid;grid-template-columns:1.1fr 1fr;gap:70px;align-items:center}.evidence .kicker{color:#ff9390}.evidence p{color:#c5d0d7;max-width:640px}.btn-outline{border:1px solid #929da5;color:#fff;margin-top:16px}.evidence-note{border:1px solid #53616b;padding:32px;background:#29343c}.evidence-note .rule{display:block;background:#ca3435;width:44px;height:4px;margin-bottom:16px}.micro{font-size:11px;font-weight:bold;letter-spacing:.1em;color:#fc9a96}.evidence-note strong{display:block;font-size:22px;margin:14px 0}.entity{border-top:1px solid #5d6870;margin-top:24px;padding-top:19px;font-size:12px;line-height:1.9;color:#d3dce2}.entity b{color:#fff}.arrow{margin:0 8px;color:#e57b76}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:19px}.news-card{border:1px solid #e4e7e8;background:#fff}.news-card>div:last-child{padding:19px 23px}.card-art{height:175px;background:linear-gradient(135deg,#323b44,#65717b);display:flex;align-items:flex-end;padding:18px}.card-art span{font-weight:bold;font-size:11px;color:#fff;letter-spacing:.19em}.art-two{background:linear-gradient(135deg,#444f56,#222a31)}.art-three{background:linear-gradient(135deg,#434b52,#75828b)}.news-card small{font-size:11px;color:#b34848}.news-card h3{font-size:20px;line-height:1.3}.news-card p{font-size:13px;color:var(--muted)}.case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.case-grid article{background:#fff;border-left:4px solid var(--red);padding:32px;min-height:180px}.case-grid span{font-size:10px;color:#ad1515;letter-spacing:.1em;font-weight:800}.case-grid h3{font-size:21px}.case-grid p{color:var(--muted);font-size:13px}.contact{background:#e9edef}.contact-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:70px;align-items:center}.contact-grid>div>p{color:#52606a}.contact-email{font-size:23px;font-weight:bold!important;color:#921313!important}.preview-form{background:#fff;padding:29px 31px;border-top:4px solid var(--red)}.preview-form>span{font-size:11px;letter-spacing:.14em;color:#ac1717;font-weight:bold}.preview-form h3{font-size:21px;line-height:1.3}.preview-form p{color:#6d787f;font-size:13px}.preview-form button{border:0;background:#d6dadd;color:#45515b;padding:11px 16px;font-size:12px;font-weight:bold}footer{background:#171c20;color:#bbc5ca;font-size:11px;padding:25px 0}.footer-grid{display:flex;justify-content:space-between;gap:25px}.footer-grid b{color:#fff}
@media(max-width:1110px){.nav-desktop{gap:11px}.nav-desktop a{font-size:11px}.hero{min-height:620px}.hero h1{font-size:clamp(40px,5.6vw,61px)}}
@media(max-width:760px){.wrap{width:calc(100% - 32px)}.preview-ribbon{font-size:9px}.preview-ribbon span{display:none}.contact-strip .wrap span:last-child{display:none}.masthead{min-height:73px}.logo b{font-size:40px}.logo span{font-size:10px}.nav-desktop,.top-cta{display:none}#menu-toggle{display:block;margin-left:auto;border:1px solid #cbd0d2;background:#fff;color:#1d262b;padding:7px 12px;font-weight:bold;font-size:12px}.nav-mobile:not([hidden]){display:flex;flex-direction:column;background:#232a30;color:#fff;padding:6px 16px}.nav-mobile a{padding:11px 4px;border-bottom:1px solid #465058;font-size:13px}.hero{min-height:720px;align-items:flex-end}.hero-layout{padding:110px 0 88px}.hero h1{font-size:clamp(36px,8.2vw,52px);margin:20px 0}.hero-poster img,.hero-video{object-position:center top}.hero-overlay{background:linear-gradient(0deg,rgba(5,10,15,.98) 0%,rgba(5,10,15,.88) 40%,rgba(5,10,15,.20) 100%)}.hero-kicker{font-size:10px}.hero-subtitle{font-size:14px}.hero-description{font-size:13px}.hero-actions{flex-direction:column;gap:10px}.btn{width:100%;min-height:44px}.hero-media-status{left:16px;bottom:12px;font-size:9px}.motion-control{right:16px;bottom:10px}.section{padding:67px 0}.section h2{font-size:clamp(29px,6.7vw,38px)}.section-lead{font-size:14px}.cap-grid,.cards,.case-grid,.split,.evidence-layout,.contact-grid{grid-template-columns:1fr}.cap{min-height:315px}.process-grid{grid-template-columns:repeat(2,1fr)}.process-grid article:nth-child(2){border-right:none}.split,.evidence-layout,.contact-grid{gap:35px}.engineering-diagram{height:300px}.footer-grid{flex-direction:column}.hero-description{max-width:90%}}
@media(max-width:370px){.hero h1{font-size:32px}.hero{min-height:690px}.hero-subtitle{font-size:13px}.hero-actions .btn{font-size:11px}.hero-media-status{font-size:8px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}


/* R2: keep physical poster until video first frame is playing; overlay maintains legibility. */
.hero-poster{pointer-events:none}.hero-video{pointer-events:none}.hero-poster.poster-hidden{opacity:0}.hero-media-status{max-width:calc(100% - 150px)}.motion-control{display:block}.motion-control[hidden]{display:none}.hero-poster img{object-position:center}@media(max-width:760px){.hero-poster img,.hero-video{object-position:center top}}

/* G4 local review: approved six FAQs only; frozen rules above unchanged. */
.g4-faq{margin-top:48px}.g4-faq>h3{font-size:21px;margin:0 0 18px}.g4-faq details{border-top:1px solid var(--line);padding:16px 0}.g4-faq summary{cursor:pointer;font-weight:700;line-height:1.5}.g4-faq summary:focus-visible{outline:2px solid var(--red);outline-offset:5px}.g4-faq details p{max-width:850px;color:var(--ink);margin:12px 0 0}.g4-faq details:last-child{border-bottom:1px solid var(--line)}

/* G4 V2: minimal header spacing correction at the inherited overflow range. */
@media(min-width:761px) and (max-width:800px){.masthead{gap:18px}}
/* G4 V2: fix the measured 3.89:1 header text contrast using the existing muted color. */
.contact-strip .wrap{color:var(--muted)}

/* G4 inquiry controls inside existing module 08. */
.preview-form label{display:block;margin:12px 0;font-size:14px}.preview-form input,.preview-form textarea{display:block;width:100%;max-width:100%;padding:10px;border:1px solid #65717a;background:#fff;color:#18232b;font:inherit}.preview-form .g4-honeypot{display:none}.preview-form button{cursor:pointer}.g4-data-notice{font-size:13px}