:root {
  --paper: #f4f1eb;
  --paper-soft: #faf8f3;
  --ink: #17191c;
  --navy: #0b2234;
  --navy-soft: #132f44;
  --red: #d51f2e;
  --red-dark: #ae1723;
  --muted: #6c6d6d;
  --line: rgba(23, 25, 28, .18);
  --line-light: rgba(255, 255, 255, .2);
  --serif: "Songti SC", STSong, "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --condensed: "Arial Narrow", "DIN Condensed", "Roboto Condensed", Arial, sans-serif;
  --header-h: 82px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: auto; scroll-padding-top: calc(var(--header-h) + 24px); -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.75; -webkit-font-smoothing: antialiased; }
body.nav-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
img { display: block; max-width: 100%; }
h1, h2, h3, p, dl, dd, figure { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
main { overflow: clip; }
.shell { width: min(1280px, calc(100% - 80px)); margin-inline: auto; }
::selection { background: var(--red); color: #fff; }
:focus-visible { outline: 3px solid rgba(213, 31, 46, .42); outline-offset: 4px; }

.skip-link { position: fixed; top: 12px; left: 12px; z-index: 999; padding: 10px 14px; background: var(--navy); color: #fff; transform: translateY(-150%); }
.skip-link:focus { transform: none; }

/* Header */
.site-header { position: fixed; inset: 0 0 auto; z-index: 100; height: var(--header-h); background: rgba(244, 241, 235, .96); border-bottom: 1px solid transparent; transition: border-color .25s ease, background .25s ease; }
.site-header.is-scrolled { border-color: var(--line); background: rgba(244, 241, 235, .985); }
.header-inner { height: 100%; display: flex; align-items: center; gap: 34px; }
.brand { flex: 0 0 auto; margin-right: auto; }
.brand img { width: 138px; height: 58px; object-fit: contain; object-position: left center; }
.main-nav { display: flex; align-items: stretch; align-self: stretch; gap: clamp(20px, 2.2vw, 36px); }
.main-nav a { position: relative; display: flex; align-items: center; color: #3e454a; font-size: 14px; white-space: nowrap; }
.main-nav a::after { content: ""; position: absolute; right: 0; bottom: -1px; left: 0; height: 2px; background: var(--red); transform: scaleX(0); transform-origin: right; transition: transform .25s ease; }
.main-nav a:hover, .main-nav a.is-active { color: var(--ink); }
.main-nav a:hover::after, .main-nav a.is-active::after { transform: scaleX(1); transform-origin: left; }
.header-cta { display: inline-flex; align-items: center; gap: 18px; padding: 10px 0 10px 18px; border-left: 1px solid var(--line); color: var(--navy); font-size: 14px; font-weight: 650; }
.header-cta span { color: var(--red); font-size: 18px; transition: transform .2s ease; }
.header-cta:hover span { transform: translate(2px, -2px); }
.nav-toggle { display: none; width: 44px; height: 44px; padding: 0; border: 0; background: transparent; cursor: pointer; }
.nav-toggle span { display: block; width: 24px; height: 1px; margin: 7px auto; background: var(--ink); transition: transform .2s ease; }
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }

/* Shared */
.section-light { background: var(--paper); }
.section-kicker, .eyebrow { color: var(--red); font-family: var(--condensed); font-size: 12px; font-weight: 700; letter-spacing: .2em; line-height: 1.3; }
.section-intro { display: grid; grid-template-columns: minmax(0, 2.2fr) minmax(260px, .8fr); gap: 70px; align-items: end; padding-bottom: 45px; border-bottom: 1px solid var(--line); }
.section-intro h2, .about h2, .contact h2 { margin-top: 18px; color: var(--navy); font-family: var(--serif); font-size: clamp(36px, 4.3vw, 62px); font-weight: 600; line-height: 1.14; letter-spacing: -.045em; }
.section-intro > p, .section-intro-wide > p { color: var(--muted); font-size: 15px; line-height: 1.9; }
.section-intro-wide { grid-template-columns: minmax(0, 1.35fr) minmax(290px, .65fr); }
.button { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; gap: 22px; padding: 0 23px; border: 1px solid transparent; border-radius: 0; background: none; font-size: 14px; font-weight: 650; cursor: pointer; transition: background .2s ease, border-color .2s ease, color .2s ease, transform .2s ease; }
.button span { font-size: 17px; transition: transform .2s ease; }
.button:hover span { transform: translateX(3px); }
.button-primary { background: var(--red); color: #fff; }
.button-primary:hover { background: var(--red-dark); }
.button-text { min-height: auto; padding: 12px 0; border-bottom: 1px solid var(--ink); color: var(--ink); }
.button-text:hover { border-color: var(--red); color: var(--red); }
.button-outline { border-color: var(--ink); }
.button-outline:hover { background: var(--ink); color: #fff; }

/* 场景交界：上一色面在进入时舒展并回落，形成一次性的材料呼吸感。 */
[data-color-scene] { position: relative; isolation: isolate; }
[data-color-scene] > .scene-breath {
  position: absolute;
  z-index: 0;
  inset: 0 0 auto;
  height: clamp(270px, 25vw, 380px);
  pointer-events: none;
  transform-origin: 50% 0;
  opacity: 1;
  background: linear-gradient(180deg, var(--scene-from) 0%, var(--scene-to) 100%);
  background: linear-gradient(
    180deg in oklab,
    var(--scene-from) 0%,
    color-mix(in oklab, var(--scene-from) 96%, var(--scene-to)) 8%,
    color-mix(in oklab, var(--scene-from) 88%, var(--scene-to)) 18%,
    color-mix(in oklab, var(--scene-from) 70%, var(--scene-to)) 32%,
    color-mix(in oklab, var(--scene-from) 45%, var(--scene-to)) 50%,
    color-mix(in oklab, var(--scene-from) 22%, var(--scene-to)) 68%,
    color-mix(in oklab, var(--scene-from) 8%, var(--scene-to)) 82%,
    color-mix(in oklab, var(--scene-from) 2%, var(--scene-to)) 92%,
    var(--scene-to) 100%
  );
  will-change: auto;
}
#solutions { --scene-from: var(--paper); --scene-to: var(--navy); }
#products { --scene-from: var(--navy); --scene-to: var(--paper); }
#contact { --scene-from: var(--paper); --scene-to: #ebe6de; }
.site-footer { --scene-from: #ebe6de; --scene-to: var(--navy); }
.js [data-color-scene].is-entering > .scene-breath {
  will-change: transform, opacity;
  animation: sceneBreathIn 900ms cubic-bezier(.16, 1, .3, 1) both;
}
@keyframes sceneBreathIn {
  0% { opacity: .72; transform: scaleY(.92); }
  62% { opacity: 1; transform: scaleY(1.025); }
  100% { opacity: 1; transform: scaleY(1); }
}
.solutions-sticky,
.products > .shell,
.contact > .shell,
.site-footer > .shell { position: relative; z-index: 3; }

/* Hero */
.hero { position: relative; min-height: 820px; display: grid; align-items: center; padding: calc(var(--header-h) + 80px) 0 72px; background: var(--paper); isolation: isolate; }
.hero::before { content: ""; position: absolute; top: var(--header-h); right: 0; bottom: 0; width: 43%; z-index: -1; background: #e8e3db; }
.hero::after { content: ""; position: absolute; top: calc(var(--header-h) + 18px); right: 38%; width: 84px; height: 1px; background: var(--red); }
.hero-grid { display: grid; grid-template-columns: minmax(440px, .9fr) minmax(500px, 1.1fr); align-items: center; gap: clamp(26px, 4vw, 64px); }
.hero-copy { position: relative; z-index: 2; padding-top: 12px; }
.hero h1 { max-width: 760px; margin-top: 25px; color: var(--navy); font-family: var(--serif); font-size: clamp(52px, 5.5vw, 80px); font-weight: 600; line-height: 1.1; letter-spacing: -.055em; }
.hero h1 em { color: var(--red); font-style: normal; }
.hero-lead { max-width: 620px; margin-top: 33px; color: #565b5f; font-size: 16px; line-height: 1.95; }
.hero-actions { display: flex; align-items: center; gap: 28px; margin-top: 36px; }
.hero-processes { display: grid; grid-template-columns: repeat(5, 1fr); max-width: 590px; margin-top: 68px; border-top: 1px solid var(--line); }
.hero-processes div { padding: 16px 10px 0 0; border-right: 1px solid var(--line); }
.hero-processes div:last-child { border-right: 0; }
.hero-processes dt { color: var(--red); font-family: var(--condensed); font-size: 10px; font-weight: 700; letter-spacing: .12em; }
.hero-processes dd { margin-top: 5px; color: var(--navy); font-family: var(--serif); font-size: 17px; }
.hero-visual { position: relative; min-width: 0; min-height: 500px; align-self: center; display: flex; align-items: center; justify-content: center; padding: 44px 0; }
.hero-visual::before, .hero-visual::after { content: ""; position: absolute; pointer-events: none; }
.hero-visual::before { inset: 9% 3% 7% 10%; border: 1px solid rgba(11, 34, 52, .16); }
.hero-visual::after { left: 10%; top: 9%; width: 34px; height: 34px; border-top: 1px solid var(--red); border-left: 1px solid var(--red); }
.hero-visual img { position: relative; z-index: 1; width: min(112%, 900px); max-width: none; height: auto; margin-left: -2%; object-fit: contain; filter: drop-shadow(0 28px 26px rgba(20, 23, 25, .11)); }
.visual-note { position: absolute; z-index: 2; color: var(--navy); font-family: var(--condensed); font-size: 10px; font-weight: 700; letter-spacing: .14em; line-height: 1.5; }
.visual-note::before { content: ""; position: absolute; top: 7px; right: calc(100% + 10px); width: 44px; height: 1px; background: var(--red); }
.visual-note-a { top: 22%; right: 2%; }
.visual-note-b { bottom: 28%; left: 2%; }
.visual-note-c { right: 8%; bottom: 14%; }
.hero-side-label { position: absolute; right: 18px; bottom: 32px; color: rgba(11, 34, 52, .55); font-family: var(--condensed); font-size: 9px; font-weight: 700; letter-spacing: .18em; writing-mode: vertical-rl; }
.js .hero-copy > *, .js .hero-visual { opacity: 0; transform: translateY(18px); }
.js.loaded .hero-copy > *, .js.loaded .hero-visual { opacity: 1; transform: none; transition: opacity .75s ease, transform .75s cubic-bezier(.22, .61, .36, 1); }
.js.loaded .hero-copy > :nth-child(2) { transition-delay: .08s; }
.js.loaded .hero-copy > :nth-child(3) { transition-delay: .15s; }
.js.loaded .hero-copy > :nth-child(4) { transition-delay: .22s; }
.js.loaded .hero-copy > :nth-child(5) { transition-delay: .29s; }
.js.loaded .hero-visual { transition-delay: .12s; }

/* Needs */
.needs { padding: 130px 0 145px; }
.need-list { display: grid; grid-template-columns: repeat(5, 1fr); }
.need-list a { position: relative; min-height: 190px; padding: 30px 24px 24px 0; border-bottom: 1px solid var(--line); border-right: 1px solid var(--line); transition: color .22s ease, padding .22s ease; }
.need-list a:last-child { border-right: 0; padding-left: 24px; }
.need-list a:not(:first-child) { padding-left: 24px; }
.need-list a::after { content: "→"; position: absolute; right: 22px; bottom: 24px; color: var(--red); font-size: 20px; opacity: 0; transform: translateX(-8px); transition: opacity .2s ease, transform .2s ease; }
.need-list a:hover { color: var(--red); }
.need-list a:hover::after { opacity: 1; transform: none; }
.need-list span { display: block; color: var(--red); font-family: var(--condensed); font-size: 11px; font-weight: 700; letter-spacing: .16em; }
.need-list strong { display: block; margin-top: 34px; color: var(--navy); font-family: var(--serif); font-size: clamp(22px, 2.1vw, 30px); font-weight: 600; }
.need-list small { display: block; margin-top: 10px; color: var(--muted); font-size: 13px; }

/* Solutions: the only dark narrative section */
.solutions { position: relative; min-height: 720px; background: var(--navy); color: #fff; }
.solutions-sticky { position: relative; min-height: 720px; display: grid; align-items: center; overflow: hidden; }
.solutions-sticky::before { content: ""; position: absolute; top: 0; bottom: 0; left: calc((100% - min(1280px, 100% - 80px)) / 2 + 32%); width: 1px; background: var(--line-light); }
.solutions-grid { min-height: 720px; display: grid; grid-template-columns: 32% 68%; align-items: stretch; }
.solution-index { display: flex; flex-direction: column; justify-content: center; padding: 90px 60px 70px 0; }
.solution-index .section-kicker { color: #ef6974; }
.solution-index h2 { margin-top: 20px; color: #fff; font-family: var(--serif); font-size: clamp(34px, 3.8vw, 54px); font-weight: 600; line-height: 1.2; letter-spacing: -.04em; }
.solution-tabs { margin-top: 54px; border-top: 1px solid var(--line-light); }
.solution-tabs button { width: 100%; display: flex; align-items: center; gap: 20px; padding: 15px 0; border: 0; border-bottom: 1px solid var(--line-light); background: transparent; color: rgba(255, 255, 255, .48); text-align: left; cursor: pointer; transition: color .25s ease, padding .25s ease; }
.solution-tabs button span { width: 24px; color: inherit; font-family: var(--condensed); font-size: 10px; letter-spacing: .12em; }
.solution-tabs button:hover, .solution-tabs button.is-active { padding-left: 12px; color: #fff; }
.solution-tabs button.is-active::after { content: ""; width: 28px; height: 1px; margin-left: auto; background: var(--red); }
.solution-stage { position: relative; min-width: 0; overflow: hidden; background: #071927; }
.solution-stage::after { content: ""; position: absolute; z-index: 1; inset: 0; background: linear-gradient(90deg, rgba(7, 25, 39, .94) 0%, rgba(7, 25, 39, .68) 42%, rgba(7, 25, 39, .12) 100%); pointer-events: none; }
.solution-media { position: absolute; inset: 0; }
.solution-image { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center; opacity: 0; transform: scale(1.045); filter: saturate(.94); transition: opacity .55s ease, transform 1.1s cubic-bezier(.2, .65, .3, 1), filter .6s ease; }
.solution-image.is-active { opacity: .82; transform: scale(1.01); }
.solution-stage.is-changing .solution-image.is-active { transform: scale(1.055); filter: saturate(.78); }
.solution-mobile-image { display: none; }
.solution-panels { position: absolute; z-index: 2; left: clamp(38px, 6vw, 92px); bottom: clamp(74px, 11vh, 128px); width: min(560px, calc(100% - 100px)); min-height: 320px; }
.solution-panel { position: absolute; inset: 0; display: flex; flex-direction: column; justify-content: flex-end; opacity: 0; visibility: hidden; pointer-events: none; transform: translateY(18px); clip-path: inset(0 0 12% 0); transition: opacity .24s ease, transform .5s cubic-bezier(.22, .61, .36, 1), clip-path .5s cubic-bezier(.22, .61, .36, 1); }
.solution-panel.is-active { opacity: 1; visibility: visible; pointer-events: auto; transform: none; clip-path: inset(0); transition-delay: .08s; }
.solution-panel > p:first-child { color: #ef6974; font-family: var(--condensed); font-size: 11px; font-weight: 700; letter-spacing: .2em; }
.solution-panel h3 { max-width: 520px; margin-top: 18px; color: #fff; font-family: var(--serif); font-size: clamp(35px, 4vw, 57px); font-weight: 600; line-height: 1.14; letter-spacing: -.04em; }
.solution-panel h3 + p { max-width: 560px; margin-top: 24px; color: rgba(255, 255, 255, .7); font-size: 15px; line-height: 1.9; }
.solution-panel a { align-self: flex-start; margin-top: 28px; padding-bottom: 4px; border-bottom: 1px solid rgba(255, 255, 255, .56); color: #fff; font-size: 13px; }
.solution-panel a span { margin-left: 14px; color: #ef6974; }
.solution-count { position: absolute; z-index: 3; right: 34px; bottom: 29px; display: flex; align-items: baseline; gap: 5px; font-family: var(--condensed); }
.solution-count b { color: #fff; font-size: 26px; font-weight: 400; }
.solution-count span { color: rgba(255, 255, 255, .4); font-size: 11px; }

/* Products */
.products { padding: 145px 0; }
.product-list { border-top: 1px solid var(--ink); }
.product-item { border-bottom: 1px solid var(--line); scroll-margin-top: calc(var(--header-h) + 26px); }
.product-item summary { min-height: 112px; display: grid; grid-template-columns: 74px minmax(230px, .65fr) minmax(280px, 1fr) 36px; align-items: center; gap: 24px; cursor: pointer; list-style: none; }
.product-item summary::-webkit-details-marker { display: none; }
.material-swatch { width: 48px; height: 48px; border-radius: 50%; border: 1px solid rgba(23, 25, 28, .12); box-shadow: inset -7px -8px 14px rgba(0, 0, 0, .1), inset 6px 6px 9px rgba(255, 255, 255, .18); }
.swatch-black { background: #18191a; }
.swatch-white { background: #fefefe; }
.swatch-color { background: conic-gradient(#c9182a, #d99b1c, #277d63, #255796, #722879, #c9182a); }
.swatch-function { background: #472f68; }
.swatch-filler { background: #c7c1b6; }
.swatch-dry { background: #7599a6; }
.swatch-green { background: #66845a; }
.product-name b { display: block; color: var(--navy); font-family: var(--serif); font-size: 24px; font-weight: 600; }
.product-name small { display: block; margin-top: 3px; color: var(--muted); font-family: var(--condensed); font-size: 9px; font-weight: 700; letter-spacing: .13em; }
.product-brief { color: var(--muted); font-size: 14px; }
.product-open { position: relative; width: 30px; height: 30px; }
.product-open::before, .product-open::after { content: ""; position: absolute; top: 50%; left: 50%; width: 15px; height: 1px; background: var(--red); transform: translate(-50%, -50%); transition: transform .25s ease; }
.product-open::after { transform: translate(-50%, -50%) rotate(90deg); }
.product-item[open] .product-open::after { transform: translate(-50%, -50%) rotate(0); }
.product-detail { display: grid; grid-template-columns: minmax(260px, .65fr) minmax(450px, 1.35fr); gap: 60px; padding: 0 60px 52px 98px; }
.product-detail > p { color: #4f5559; line-height: 1.9; }
.product-detail dl { border-top: 1px solid var(--line); }
.product-detail dl div { display: grid; grid-template-columns: 86px 1fr; gap: 22px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.product-detail dt { color: var(--red); font-size: 12px; font-weight: 650; }
.product-detail dd { color: #52575b; font-size: 13px; line-height: 1.75; }

/* Capability */
.capability { padding: 0 0 145px; }
.capability-list { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--line); }
.capability-list article { min-height: 330px; padding: 40px 42px 38px 0; border-right: 1px solid var(--line); }
.capability-list article:not(:first-child) { padding-left: 42px; }
.capability-list article:last-child { border-right: 0; }
.capability-list span { color: var(--red); font-family: var(--condensed); font-size: 10px; font-weight: 700; letter-spacing: .18em; }
.capability-list h3 { margin-top: 52px; color: var(--navy); font-family: var(--serif); font-size: 31px; font-weight: 600; }
.capability-list p { margin-top: 22px; color: var(--muted); font-size: 14px; line-height: 1.9; }

/* About */
.about { padding: 145px 0; border-top: 1px solid var(--line); }
.about-grid { display: grid; grid-template-columns: minmax(390px, .9fr) minmax(480px, 1.1fr); gap: 11%; }
.about h2 { max-width: 570px; }
.about-copy { padding-top: 42px; }
.about-copy p { color: #4d5357; font-size: 17px; line-height: 2; }
.about-copy p + p { margin-top: 22px; }
.text-link { display: inline-flex; align-items: center; gap: 28px; margin-top: 38px; padding-bottom: 4px; border-bottom: 1px solid var(--ink); color: var(--navy); font-size: 14px; font-weight: 650; }
.text-link span { color: var(--red); }

/* Contact and footer */
.contact { padding: 135px 0; background: #ebe6de; }
.contact-grid { display: grid; grid-template-columns: minmax(480px, 1fr) minmax(420px, .82fr); gap: 10%; align-items: start; }
.contact h2 { max-width: 700px; }
.contact-lead > p:not(.section-kicker) { max-width: 620px; margin-top: 27px; color: var(--muted); }
.contact-actions { display: flex; gap: 14px; margin-top: 40px; }
.contact-details { border-top: 1px solid var(--ink); }
.contact-details div { display: grid; grid-template-columns: 128px 1fr; gap: 20px; padding: 17px 0; border-bottom: 1px solid var(--line); }
.contact-details dt { color: var(--muted); font-size: 12px; }
.contact-details dd { color: var(--navy); font-size: 14px; }
.contact-details a:hover { color: var(--red); }
.site-footer { position: relative; overflow: hidden; padding: 72px 0 26px; background: var(--navy); color: #fff; }
.footer-main { min-height: 150px; display: grid; grid-template-columns: 1fr 1.4fr 1fr; align-items: start; gap: 50px; }
.footer-main img { width: 154px; padding: 8px; background: var(--paper); }
.footer-main p { color: rgba(255, 255, 255, .7); font-family: var(--serif); font-size: 21px; }
.footer-main a { justify-self: end; color: rgba(255, 255, 255, .7); font-family: var(--condensed); font-size: 12px; letter-spacing: .08em; }
.footer-main a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 30px; padding-top: 22px; border-top: 1px solid var(--line-light); color: rgba(255, 255, 255, .42); font-size: 11px; }
.mobile-actions { display: none; }
.toast { position: fixed; right: 24px; bottom: 24px; z-index: 200; padding: 12px 18px; background: var(--ink); color: #fff; font-size: 13px; opacity: 0; pointer-events: none; transform: translateY(10px); transition: opacity .2s ease, transform .2s ease; }
.toast.is-visible { opacity: 1; transform: none; }

@media (max-width: 1080px) {
  :root { --header-h: 74px; }
  .shell { width: min(100% - 48px, 1280px); }
  .main-nav { gap: 18px; }
  .main-nav a { font-size: 13px; }
  .header-cta { display: none; }
  .hero { min-height: 760px; }
  .hero-grid { grid-template-columns: minmax(390px, .93fr) minmax(390px, 1.07fr); }
  .hero h1 { font-size: clamp(48px, 6vw, 68px); }
  .solution-index { padding-right: 35px; }
  .product-detail { gap: 35px; padding-left: 74px; }
  .contact-grid { gap: 6%; }
}

@media (max-width: 880px) {
  .shell { width: min(100% - 40px, 720px); }
  .site-header { background: rgba(244, 241, 235, .985); }
  .brand img { width: 125px; height: 52px; }
  .nav-toggle { display: block; }
  .main-nav { position: fixed; inset: var(--header-h) 0 auto; display: grid; gap: 0; padding: 14px 20px 26px; border-top: 1px solid var(--line); background: var(--paper); transform: translateY(-120%); visibility: hidden; transition: transform .3s ease, visibility .3s; }
  .main-nav.is-open { transform: none; visibility: visible; }
  .main-nav a { min-height: 54px; border-bottom: 1px solid var(--line); font-family: var(--serif); font-size: 17px; }
  .main-nav a::after { display: none; }
  .hero { min-height: auto; padding: calc(var(--header-h) + 54px) 0 80px; }
  .hero::before { top: auto; width: 100%; height: 42%; }
  .hero::after { right: 20px; }
  .hero-grid { display: flex; flex-direction: column; align-items: stretch; }
  .hero h1 { font-size: clamp(44px, 10vw, 68px); }
  .hero-visual { order: 2; min-height: 0; margin-top: 28px; padding: 34px 0; }
  .hero-visual img { width: 100%; margin-left: 0; }
  .hero-side-label { display: none; }
  .section-intro, .section-intro-wide { grid-template-columns: 1fr; gap: 22px; }
  .need-list { grid-template-columns: repeat(2, 1fr); }
  .need-list a { border-top: 0; }
  .need-list a:nth-child(2n) { border-right: 0; }
  .solutions { height: auto; }
  .solutions-sticky { position: relative; height: auto; min-height: 0; }
  .solutions-sticky::before, .solution-tabs, .solution-count { display: none; }
  .solutions-grid { width: 100%; display: block; }
  .solution-index { padding: 96px 20px 48px; }
  .solution-index h2 { max-width: 620px; }
  .solution-stage { background: var(--navy); overflow: visible; }
  .solution-stage::after { display: none; }
  .solution-media { display: none; }
  .solution-panels { position: static; width: auto; min-height: 0; }
  .solution-panel, .solution-panel.is-active { position: relative; inset: auto; min-height: 360px; justify-content: center; padding: 62px 20px; border-bottom: 1px solid var(--line-light); opacity: 1; visibility: visible; transform: none; }
  .solution-mobile-image { display: block; width: calc(100% + 40px); max-width: none; height: auto; aspect-ratio: 16 / 9; margin: -62px -20px 48px; object-fit: cover; }
  .solution-panel h3 { max-width: 650px; }
  .solution-panel h3 + p { max-width: 650px; }
  .product-item summary { grid-template-columns: 58px minmax(190px, .9fr) minmax(250px, 1.1fr) 30px; }
  .product-detail { grid-template-columns: 1fr; gap: 24px; padding: 0 36px 46px 82px; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 42px; }
  .about-copy { padding-top: 0; }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .footer-main p { grid-row: 2; }
}

@media (max-width: 640px) {
  :root { --header-h: 68px; }
  body { font-size: 15px; padding-bottom: 58px; }
  .shell { width: calc(100% - 32px); }
  .site-header { height: var(--header-h); }
  .brand img { width: 112px; height: 48px; }
  .hero { padding: calc(var(--header-h) + 42px) 0 68px; }
  [data-color-scene] > .scene-breath { height: clamp(150px, 44vw, 190px); }
  .hero::before { height: 34%; }
  .hero h1 { margin-top: 18px; font-size: clamp(40px, 12.1vw, 58px); line-height: 1.12; }
  .hero h1 br { display: none; }
  .hero-lead { margin-top: 24px; font-size: 14px; }
  .hero-actions { align-items: stretch; flex-direction: column; gap: 10px; margin-top: 28px; }
  .hero-actions .button-text { align-self: flex-start; }
  .hero-processes { margin-top: 46px; }
  .hero-processes div { padding-right: 4px; }
  .hero-processes dt { font-size: 8px; }
  .hero-processes dd { font-size: 14px; }
  .hero-visual { min-height: 0; margin-inline: 0; padding: 22px 0; }
  .hero-visual::before { inset: 7% 5%; }
  .hero-visual img { width: 100%; margin-left: 0; }
  .visual-note { display: none; }
  .needs, .products, .about, .contact { padding: 92px 0; }
  .section-intro { padding-bottom: 32px; }
  .section-intro h2, .about h2, .contact h2 { font-size: clamp(34px, 10vw, 46px); }
  .need-list { display: block; }
  .need-list a, .need-list a:not(:first-child), .need-list a:last-child { min-height: 118px; display: grid; grid-template-columns: 38px 1fr auto; align-items: center; padding: 0; border-right: 0; }
  .need-list strong { margin: 0; font-size: 23px; }
  .need-list small { margin: 0; }
  .need-list a::after { display: none; }
  .solution-index { padding-top: 82px; }
  .solution-panel, .solution-panel.is-active { min-height: 380px; padding: 58px 16px; }
  .solution-mobile-image { width: calc(100% + 32px); margin: -58px -16px 44px; }
  .solution-panel h3 { font-size: 38px; }
  .product-item summary { min-height: 106px; grid-template-columns: 48px 1fr 28px; gap: 14px; }
  .material-swatch { width: 40px; height: 40px; }
  .product-name b { font-size: 22px; }
  .product-brief { grid-column: 2; margin-top: -22px; padding: 0 8px 15px 0; font-size: 12px; }
  .product-open { grid-column: 3; grid-row: 1 / span 2; }
  .product-detail { padding: 0 0 38px 62px; }
  .product-detail dl div { grid-template-columns: 58px 1fr; gap: 12px; }
  .capability { padding-bottom: 92px; }
  .capability-list { display: block; }
  .capability-list article, .capability-list article:not(:first-child) { min-height: 0; padding: 38px 0 42px; border-right: 0; border-bottom: 1px solid var(--line); }
  .capability-list h3 { margin-top: 28px; font-size: 27px; }
  .contact-actions { align-items: stretch; flex-direction: column; }
  .contact-details div { grid-template-columns: 105px 1fr; gap: 12px; }
  .footer-main { display: block; min-height: 0; }
  .footer-main p { margin-top: 28px; }
  .footer-main a { display: inline-block; margin-top: 22px; }
  .footer-bottom { flex-direction: column; gap: 6px; margin-top: 48px; }
  .mobile-actions { position: fixed; right: 0; bottom: 0; left: 0; z-index: 150; height: 58px; display: grid; grid-template-columns: 1fr 1fr; background: #fff; border-top: 1px solid var(--line); }
  .mobile-actions a, .mobile-actions button { display: flex; align-items: center; justify-content: center; border: 0; background: #fff; color: var(--navy); font-weight: 650; }
  .mobile-actions button { background: var(--red); color: #fff; }
  .toast { right: 16px; bottom: 74px; left: 16px; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .js .hero-copy > *, .js .hero-visual { opacity: 1; transform: none; }
  .js [data-color-scene].is-entering > .scene-breath { animation: none; transform: none; }
}