:root {
  --navy: #061426;
  --navy-2: #0b223b;
  --ink: #10263c;
  --muted: #627589;
  --paper: #f5f8fb;
  --line: #d8e3ec;
  --blue: #1677ff;
  --cyan: #20c7d9;
  --green: #2fbe83;
  --orange: #ff9a55;
  --shadow: 0 30px 80px rgba(6, 20, 38, .14);
  --radius: 24px;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }
.container { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 999; padding: 10px 16px; background: white; border-radius: 8px; transition: top .2s; }
.skip-link:focus { top: 16px; }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: 80px;
  color: white;
  border-bottom: 1px solid rgba(255,255,255,.1);
  transition: height .25s, background .25s, box-shadow .25s;
}
.site-header.scrolled { height: 68px; background: rgba(6,20,38,.93); backdrop-filter: blur(18px); box-shadow: 0 10px 35px rgba(0,0,0,.16); }
.nav-wrap { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 11px; }
.brand img { border-radius: 12px; box-shadow: 0 8px 30px rgba(22,119,255,.15); }
.brand span { display: grid; line-height: 1.05; }
.brand strong { font-size: 17px; letter-spacing: .04em; }
.brand small { margin-top: 5px; color: var(--cyan); font-size: 10px; font-weight: 700; letter-spacing: .08em; }
.nav { display: flex; align-items: center; gap: 30px; font-size: 14px; }
.nav a { color: rgba(255,255,255,.75); transition: color .2s; }
.nav a:hover { color: white; }
.nav .nav-download { color: white; padding: 10px 19px; border: 1px solid rgba(32,199,217,.6); border-radius: 999px; background: rgba(32,199,217,.08); }
.nav-toggle { display: none; width: 42px; height: 42px; border: 0; background: transparent; padding: 9px; }
.nav-toggle span { display: block; height: 2px; margin: 5px 0; background: white; border-radius: 2px; }

.hero { min-height: 900px; height: 100svh; position: relative; overflow: hidden; color: white; background: var(--navy); }
.hero-image { position: absolute; inset: 0; background: url('/assets/xiawin-hero.png') 64% 50% / cover no-repeat; transform: scale(1.015); }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(6,20,38,.98) 0%, rgba(6,20,38,.82) 34%, rgba(6,20,38,.27) 70%, rgba(6,20,38,.25) 100%), linear-gradient(0deg, rgba(6,20,38,.83), transparent 45%); }
.hero-content { position: relative; height: 100%; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; padding-top: 66px; }
.eyebrow { display: flex; align-items: center; gap: 10px; color: var(--cyan); text-transform: uppercase; font-size: 12px; font-weight: 800; letter-spacing: .13em; }
.eyebrow span { width: 28px; height: 2px; background: currentColor; box-shadow: 8px 0 18px currentColor; }
.eyebrow.dark { color: var(--blue); }
.hero h1 { margin: 26px 0 20px; font-size: clamp(48px, 5.2vw, 78px); line-height: 1.17; letter-spacing: -.04em; }
.hero h1 em { color: white; font-style: normal; }
.hero h1 em::after { content: ""; display: block; width: 175px; height: 4px; margin-top: 20px; border-radius: 3px; background: linear-gradient(90deg, var(--blue), var(--cyan)); }
.hero-lead { max-width: 660px; margin: 0; color: rgba(224,237,247,.78); font-size: 18px; line-height: 1.85; }
.hero-actions { display: flex; gap: 14px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 18px; min-height: 50px; padding: 0 24px; border-radius: 12px; font-size: 14px; font-weight: 700; transition: transform .2s, background .2s, box-shadow .2s; }
.button:hover { transform: translateY(-2px); }
.button.primary { color: white; background: linear-gradient(135deg, var(--blue), #1262d3); box-shadow: 0 16px 36px rgba(22,119,255,.28); }
.button.primary:hover { box-shadow: 0 20px 42px rgba(22,119,255,.4); }
.button.ghost { color: white; border: 1px solid rgba(255,255,255,.25); background: rgba(255,255,255,.06); backdrop-filter: blur(12px); }
.button.wide { width: 100%; }
.hero-points { position: absolute; left: 24px; right: 24px; bottom: 54px; display: grid; grid-template-columns: repeat(4, 1fr); margin: 0; padding: 0; list-style: none; border: 1px solid rgba(95,162,203,.25); border-radius: 18px; background: rgba(8,30,51,.7); backdrop-filter: blur(15px); }
.hero-points li { min-height: 84px; display: flex; flex-direction: column; justify-content: center; padding: 0 28px; border-right: 1px solid rgba(95,162,203,.2); }
.hero-points li:last-child { border: 0; }
.hero-points b { font-size: 15px; }
.hero-points span { color: rgba(205,222,234,.6); font-size: 12px; }
.scroll-cue { position: absolute; left: 50%; bottom: 16px; width: 28px; height: 36px; transform: translateX(-50%); }
.scroll-cue span { position: absolute; left: 12px; top: 4px; width: 4px; height: 8px; border-radius: 4px; background: var(--cyan); animation: cue 1.8s infinite; }
@keyframes cue { 0% { transform: translateY(0); opacity: 0; } 30% { opacity: 1; } 100% { transform: translateY(16px); opacity: 0; } }

.section { padding: 118px 0; position: relative; overflow: hidden; }
.section-heading { max-width: 760px; margin-bottom: 52px; }
.section-heading h2 { margin: 16px 0 14px; font-size: clamp(36px, 4vw, 54px); line-height: 1.25; letter-spacing: -.035em; }
.section-heading p { margin: 0; color: var(--muted); font-size: 17px; line-height: 1.85; }
.section-heading.light h2 { color: white; }
.section-heading.light p { color: rgba(211,226,237,.7); }

.value { background: var(--paper); }
.value::before { content: ""; position: absolute; top: -230px; right: -230px; width: 540px; height: 540px; border: 1px solid #d8e9fa; border-radius: 50%; box-shadow: 0 0 0 70px rgba(218,235,249,.35), 0 0 0 150px rgba(218,235,249,.18); }
.feature-grid { position: relative; display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.feature-card { position: relative; min-height: 230px; padding: 34px 36px; border: 1px solid var(--line); border-radius: var(--radius); background: white; box-shadow: 0 12px 45px rgba(6,20,38,.045); transition: transform .25s, box-shadow .25s, border-color .25s; }
.feature-card:hover { transform: translateY(-5px); border-color: #bdd6ee; box-shadow: var(--shadow); }
.feature-card h3 { margin: 24px 0 9px; font-size: 21px; }
.feature-card p { max-width: 430px; margin: 0; color: var(--muted); font-size: 14px; }
.card-number { position: absolute; right: 28px; top: 24px; color: #dae7f2; font-size: 42px; font-weight: 800; }
.line-icon { position: relative; width: 46px; height: 46px; border-radius: 13px; background: #eaf3ff; }
.line-icon::before, .line-icon::after { content: ""; position: absolute; border: 2px solid var(--blue); }
.line-icon.window::before { inset: 11px 9px 9px; border-radius: 4px; }
.line-icon.window::after { left: 9px; right: 9px; top: 17px; border-width: 1px 0 0; }
.line-icon.integrate { background: #e8fbfd; }
.line-icon.integrate::before { width: 17px; height: 22px; left: 7px; top: 12px; border-color: var(--cyan); border-radius: 3px; }
.line-icon.integrate::after { width: 17px; height: 22px; right: 7px; top: 8px; border-color: var(--cyan); border-radius: 3px; }
.line-icon.package { background: #e9fbf5; }
.line-icon.package::before { inset: 10px; border-color: var(--green); transform: rotate(30deg); }
.line-icon.package::after { left: 22px; top: 9px; height: 28px; border-color: var(--green); border-width: 0 0 0 2px; transform: rotate(30deg); }
.line-icon.shield { background: #fff4eb; }
.line-icon.shield::before { inset: 8px 11px; border-color: var(--orange); border-radius: 11px 11px 15px 15px; transform: rotate(45deg); }
.line-icon.shield::after { width: 12px; height: 7px; left: 16px; top: 17px; border-color: var(--orange); border-width: 0 0 2px 2px; transform: rotate(-45deg); }

.capability-band { color: white; background: var(--navy); }
.capability-band::before { content: ""; position: absolute; inset: 0; background: linear-gradient(rgba(32,199,217,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(32,199,217,.035) 1px, transparent 1px); background-size: 34px 34px; mask-image: linear-gradient(to bottom, transparent, black 25%, black 80%, transparent); }
.capability-grid { position: relative; display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid rgba(89,149,187,.25); border-radius: var(--radius); overflow: hidden; }
.capability { min-height: 170px; padding: 30px; background: rgba(12,40,65,.7); border-right: 1px solid rgba(89,149,187,.2); border-bottom: 1px solid rgba(89,149,187,.2); }
.capability:nth-child(3n) { border-right: 0; }
.capability:nth-child(n+4) { border-bottom: 0; }
.capability i { color: var(--cyan); font-size: 12px; font-style: normal; font-weight: 800; }
.capability h3 { margin: 16px 0 7px; font-size: 18px; }
.capability p { margin: 0; color: rgba(210,225,236,.62); font-size: 13px; }
.simple-flow { position: relative; display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; align-items: center; gap: 20px; margin-top: 34px; padding: 22px; border-radius: 16px; background: #0d2b47; border: 1px solid rgba(71,139,180,.3); text-align: center; }
.simple-flow span { padding: 10px; color: #e9f5fc; font-weight: 700; }
.simple-flow b { color: var(--cyan); font-size: 22px; }

.app-ecosystem { background: linear-gradient(180deg, #eef4f9, white); }
.ecosystem-visual { position: relative; margin: 0; overflow: hidden; border: 1px solid #c9ddea; border-radius: 28px; background: var(--navy); box-shadow: var(--shadow); }
.ecosystem-visual img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.ecosystem-visual figcaption { position: absolute; left: 24px; right: 24px; bottom: 22px; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 16px 20px; border: 1px solid rgba(103,166,203,.25); border-radius: 14px; color: white; background: rgba(6,20,38,.86); backdrop-filter: blur(14px); }
.ecosystem-visual figcaption b { font-size: 15px; }
.ecosystem-visual figcaption span { color: rgba(213,227,237,.66); font-size: 11px; }
.app-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 24px; }
.app-tags span { padding: 9px 16px; border: 1px solid #d2e1ec; border-radius: 999px; color: #466078; background: white; font-size: 12px; font-weight: 700; }
.os-support { display: flex; align-items: center; gap: 12px; margin-top: 26px; padding: 20px 22px; border: 1px solid #c9dff7; border-radius: 18px; background: #eaf4ff; }
.os-support > div { margin-right: auto; }
.os-support small, .os-support strong { display: block; }
.os-support small { color: var(--blue); font-size: 10px; font-weight: 800; letter-spacing: .08em; }
.os-support strong { margin-top: 3px; font-size: 16px; }
.os-support > span { padding: 8px 14px; border-radius: 999px; color: white; background: var(--navy-2); font-size: 11px; font-weight: 700; }

.engine { background: white; }
.engine-layout { display: grid; grid-template-columns: .85fr 1.35fr; gap: 70px; align-items: center; }
.engine-copy h2 { margin: 16px 0 20px; font-size: 52px; line-height: 1.22; letter-spacing: -.04em; }
.engine-copy > p { color: var(--muted); font-size: 16px; }
.check-list { display: grid; gap: 20px; margin: 32px 0 0; padding: 0; list-style: none; }
.check-list li { position: relative; padding-left: 24px; }
.check-list li::before { content: ""; position: absolute; left: 0; top: 8px; width: 8px; height: 8px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 0 6px #e6f9fb; }
.check-list strong, .check-list span { display: block; }
.check-list strong { font-size: 15px; }
.check-list span { margin-top: 3px; color: var(--muted); font-size: 13px; }
.engine-visual { margin: 0; overflow: hidden; border-radius: var(--radius); background: var(--navy); box-shadow: var(--shadow); }
.engine-visual img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.engine-visual figcaption { display: flex; flex-wrap: wrap; justify-content: center; gap: 24px; padding: 17px; color: rgba(221,234,243,.78); background: var(--navy-2); font-size: 12px; }
.engine-visual figcaption i { display: inline-block; width: 7px; height: 7px; margin-right: 8px; border-radius: 50%; }
.blue { background: var(--blue); }.cyan { background: var(--cyan); }.green { background: var(--green); }
.architecture { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 14px; align-items: stretch; margin-top: 52px; }
.architecture > div { padding: 23px 20px; border: 1px solid var(--line); border-radius: 15px; background: var(--paper); }
.architecture > div.accent { color: white; border-color: #20577a; background: var(--navy-2); }
.architecture small, .architecture strong { display: block; }
.architecture small { margin-bottom: 7px; color: var(--blue); font-weight: 800; }
.architecture .accent small { color: var(--cyan); }
.architecture strong { font-size: 13px; line-height: 1.6; }
.architecture > span { align-self: center; color: var(--cyan); font-size: 22px; transform: rotate(-90deg); }

.graphics { background: var(--paper); }
.gpu-flow { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr; gap: 14px; align-items: center; }
.gpu-flow article { min-height: 170px; padding: 26px 22px; border: 1px solid var(--line); border-radius: 19px; background: white; box-shadow: 0 12px 34px rgba(6,20,38,.04); }
.gpu-flow article i, .gpu-flow article b, .gpu-flow article span { display: block; }
.gpu-flow article i { color: var(--blue); font-size: 11px; font-style: normal; font-weight: 800; }
.gpu-flow article b { margin: 26px 0 9px; font-size: 18px; }
.gpu-flow article span { color: var(--muted); font-size: 12px; }
.gpu-flow > strong { color: var(--cyan); font-size: 22px; }
.gpu-benefits { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 28px; }
.gpu-benefits article { position: relative; padding: 28px 28px 28px 54px; border-radius: 18px; color: white; background: var(--navy); }
.gpu-benefits article > span { position: absolute; left: 27px; top: 34px; width: 9px; height: 9px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 0 6px rgba(32,199,217,.12); }
.gpu-benefits h3 { margin: 0 0 8px; font-size: 17px; }
.gpu-benefits p { margin: 0; color: rgba(212,226,237,.66); font-size: 12px; }

.proof { color: white; background: var(--navy); }
.proof::after { content: ""; position: absolute; left: -200px; bottom: -320px; width: 680px; height: 680px; border-radius: 50%; background: radial-gradient(circle, rgba(22,119,255,.13), transparent 66%); }
.proof .container { position: relative; z-index: 1; }
.proof-shot { position: relative; margin: 0; padding: 26px 10px 10px; overflow: hidden; border: 1px solid #244762; border-radius: var(--radius); background: #0b233b; box-shadow: 0 45px 90px rgba(0,0,0,.32); }
.screen-dots { position: absolute; top: 10px; left: 15px; display: flex; gap: 6px; }
.screen-dots i { width: 7px; height: 7px; border-radius: 50%; background: #2e5571; }
.proof-shot img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; object-position: center 44%; border-radius: 15px; }
.proof-shot figcaption { position: absolute; left: 34px; bottom: 32px; padding: 12px 17px; border-radius: 10px; background: rgba(6,20,38,.87); backdrop-filter: blur(10px); font-size: 12px; font-weight: 700; }
.proof-shot figcaption span { display: inline-block; width: 8px; height: 8px; margin-right: 9px; border-radius: 50%; background: var(--cyan); }
.proof-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 24px; }
.proof-cards article { padding: 25px; border: 1px solid rgba(87,148,187,.25); border-radius: 16px; background: #0d2944; }
.proof-cards b, .proof-cards span { display: block; }
.proof-cards b { font-size: 16px; }
.proof-cards span { margin-top: 7px; color: rgba(209,225,236,.6); font-size: 12px; }

.compare { background: white; }
.compare-table-wrap { overflow-x: auto; border-radius: 18px; box-shadow: var(--shadow); }
.compare-table { width: 100%; min-width: 920px; border-collapse: collapse; background: white; font-size: 12px; }
.compare-table th, .compare-table td { min-width: 165px; padding: 20px 16px; border: 1px solid var(--line); text-align: center; }
.compare-table th:first-child { min-width: 130px; text-align: left; }
.compare-table thead th { color: white; border-color: #17334e; background: var(--navy); font-size: 13px; }
.compare-table thead th:first-child { text-align: center; }
.compare-table tbody th { color: var(--ink); background: #f1f5f8; font-weight: 800; }
.compare-table tr:nth-child(even) td { background: #f7f9fb; }
.compare-table .xia { color: var(--blue); background: #e8f2ff !important; font-weight: 800; }
.compare-table thead .xia { color: white; background: var(--blue) !important; }
.comparison-note { margin: 22px 0 0; color: var(--muted); font-size: 12px; }

.delivery { min-height: 760px; padding: 0; color: white; background: var(--navy); }
.delivery-image { position: absolute; inset: 0; background: url('/assets/xiawin-enterprise.png') 50% 50% / cover no-repeat; }
.delivery-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(6,20,38,.97), rgba(6,20,38,.82) 47%, rgba(6,20,38,.4)), linear-gradient(0deg, rgba(6,20,38,.82), transparent 58%); }
.delivery-content { position: relative; z-index: 1; padding-top: 110px; padding-bottom: 100px; }
.delivery-content .section-heading { max-width: 690px; }
.delivery-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.delivery-grid article { min-height: 152px; padding: 26px; border: 1px solid rgba(83,151,191,.26); border-radius: 18px; background: rgba(10,37,61,.82); backdrop-filter: blur(14px); }
.delivery-grid i, .delivery-grid b, .delivery-grid span { display: block; }
.delivery-grid i { color: var(--cyan); font-size: 11px; font-style: normal; font-weight: 800; }
.delivery-grid b { margin: 18px 0 6px; font-size: 18px; }
.delivery-grid span { color: rgba(214,227,237,.63); font-size: 12px; }
.delivery-scope { display: inline-flex; margin: 26px 0 0; padding: 11px 18px; border: 1px solid rgba(32,199,217,.3); border-radius: 999px; color: #d9edf5; background: rgba(10,39,64,.75); font-size: 12px; }

.download { background: var(--paper); }
.download-layout { display: grid; grid-template-columns: .95fr 1.05fr; gap: 100px; align-items: center; }
.download-copy h2 { margin: 16px 0 18px; font-size: 58px; line-height: 1.2; }
.download-copy > p { color: var(--muted); font-size: 16px; }
.download-meta { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; margin: 32px 0 0; padding: 1px; list-style: none; overflow: hidden; border-radius: 16px; background: var(--line); }
.download-meta li { display: flex; justify-content: space-between; padding: 15px 17px; background: white; font-size: 12px; }
.download-meta span { color: var(--muted); }
.download-os { margin: 16px 0 0; padding: 13px 16px; border-radius: 12px; color: #456079; background: #eaf4ff; font-size: 12px !important; }
.download-os b { color: var(--blue); }
.download-card { display: grid; grid-template-columns: auto 1fr; gap: 0 18px; padding: 38px; border: 1px solid #c9ddea; border-radius: 26px; background: white; box-shadow: var(--shadow); }
.download-card > img { grid-row: span 1; }
.download-card small { color: var(--blue); font-size: 10px; font-weight: 800; text-transform: uppercase; letter-spacing: .1em; }
.download-card h3 { margin: 2px 0 0; font-size: 24px; }
.download-card p { margin: 2px 0 0; color: var(--muted); font-size: 12px; }
.download-card .wide { grid-column: 1 / -1; margin-top: 28px; }
.secondary-downloads { grid-column: 1 / -1; display: flex; justify-content: center; gap: 28px; margin-top: 18px; color: var(--blue); font-size: 12px; font-weight: 700; }
.secondary-downloads a:hover { text-decoration: underline; }
.hash { grid-column: 1 / -1; display: grid; grid-template-columns: auto 1fr auto; gap: 9px; align-items: center; margin-top: 25px; padding: 12px; border-radius: 10px; background: #f0f4f7; }
.hash span { color: var(--muted); font-size: 9px; font-weight: 800; }
.hash code { overflow: hidden; color: #4b6073; font-size: 9px; text-overflow: ellipsis; white-space: nowrap; }
.hash button { border: 0; color: var(--blue); background: transparent; font: inherit; font-size: 10px; font-weight: 800; cursor: pointer; }

.site-footer { padding: 58px 0 30px; color: white; background: #04101f; }
.footer-grid { display: grid; grid-template-columns: auto 1fr auto; gap: 70px; align-items: center; }
.footer-grid > p { color: rgba(209,225,236,.54); font-size: 13px; }
.footer-grid > div { display: flex; gap: 24px; color: rgba(220,232,240,.7); font-size: 12px; }
.footer-grid a:hover { color: var(--cyan); }
.footer-bottom { display: flex; justify-content: space-between; margin-top: 38px; padding-top: 20px; border-top: 1px solid #193049; color: #6d8499; font-size: 10px; }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }
.feature-grid .reveal:nth-child(2), .capability-grid .reveal:nth-child(2), .delivery-grid .reveal:nth-child(2) { transition-delay: .08s; }
.feature-grid .reveal:nth-child(3), .capability-grid .reveal:nth-child(3), .delivery-grid .reveal:nth-child(3) { transition-delay: .16s; }
.feature-grid .reveal:nth-child(4), .capability-grid .reveal:nth-child(4), .delivery-grid .reveal:nth-child(4) { transition-delay: .24s; }

@media (max-width: 980px) {
  .nav { position: fixed; inset: 68px 0 auto; display: none; padding: 24px; flex-direction: column; align-items: stretch; gap: 8px; background: rgba(6,20,38,.98); border-bottom: 1px solid #1c3852; }
  .nav.open { display: flex; }
  .nav a { padding: 12px 20px; }
  .nav-toggle { display: block; }
  body.nav-open { overflow: hidden; }
  .hero { min-height: 820px; }
  .hero-image { background-position: 70% center; }
  .hero-shade { background: linear-gradient(90deg, rgba(6,20,38,.98), rgba(6,20,38,.72)); }
  .hero-content { justify-content: center; }
  .hero-points { grid-template-columns: repeat(2, 1fr); bottom: 34px; }
  .hero-points li:nth-child(2) { border-right: 0; }
  .hero-points li:nth-child(-n+2) { border-bottom: 1px solid rgba(95,162,203,.2); }
  .engine-layout, .download-layout { grid-template-columns: 1fr; gap: 50px; }
  .engine-copy h2, .download-copy h2 { font-size: 46px; }
  .capability-grid { grid-template-columns: repeat(2, 1fr); }
  .capability:nth-child(3n) { border-right: 1px solid rgba(89,149,187,.2); }
  .capability:nth-child(2n) { border-right: 0; }
  .capability:nth-child(n+4) { border-bottom: 1px solid rgba(89,149,187,.2); }
  .capability:nth-last-child(-n+2) { border-bottom: 0; }
  .gpu-flow { grid-template-columns: repeat(2, 1fr); }
  .gpu-flow > strong { display: none; }
  .delivery-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 680px) {
  .container { width: min(100% - 30px, 1180px); }
  .site-header { height: 68px; }
  .section { padding: 82px 0; }
  .section-heading { margin-bottom: 36px; }
  .section-heading h2 { font-size: 34px; }
  .section-heading p { font-size: 14px; }
  .hero { min-height: 760px; height: auto; }
  .hero-image { background-position: 68% center; opacity: .72; }
  .hero-shade { background: linear-gradient(90deg, rgba(6,20,38,.98), rgba(6,20,38,.62)), linear-gradient(0deg, rgba(6,20,38,.98), transparent); }
  .hero-content { min-height: 760px; padding-top: 80px; padding-bottom: 210px; }
  .hero h1 { margin-top: 20px; font-size: 34px; letter-spacing: -.045em; }
  .hero-lead { font-size: 15px; }
  .hero-actions { width: 100%; flex-direction: column; }
  .hero-actions .button { width: 100%; }
  .hero-points { left: 15px; right: 15px; bottom: 25px; }
  .hero-points li { min-height: 70px; padding: 0 16px; }
  .hero-points b { font-size: 13px; }.hero-points span { font-size: 10px; }
  .scroll-cue { display: none; }
  .feature-grid, .capability-grid, .gpu-benefits, .proof-cards, .delivery-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: 210px; padding: 28px; }
  .capability { border-right: 0 !important; border-bottom: 1px solid rgba(89,149,187,.2) !important; }
  .capability:last-child { border-bottom: 0 !important; }
  .simple-flow { grid-template-columns: 1fr; gap: 7px; }
  .simple-flow b { transform: rotate(90deg); }
  .engine-copy h2, .download-copy h2 { font-size: 39px; }
  .engine-visual figcaption { align-items: flex-start; flex-direction: column; gap: 8px; }
  .architecture { grid-template-columns: 1fr; }
  .architecture > span { transform: none; text-align: center; }
  .gpu-flow { grid-template-columns: 1fr; }
  .gpu-flow article { min-height: 145px; }
  .proof-shot { padding: 20px 6px 6px; border-radius: 15px; }
  .ecosystem-visual figcaption { position: static; align-items: flex-start; flex-direction: column; gap: 2px; border: 0; border-radius: 0; }
  .os-support { align-items: flex-start; flex-wrap: wrap; }
  .os-support > div { width: 100%; margin: 0 0 5px; }
  .proof-shot figcaption { left: 16px; bottom: 16px; padding: 8px 10px; font-size: 10px; }
  .delivery { min-height: 900px; }
  .delivery-shade { background: rgba(6,20,38,.82); }
  .download-card { padding: 26px; }
  .secondary-downloads { align-items: center; flex-direction: column; gap: 9px; }
  .download-meta { grid-template-columns: 1fr; }
  .hash { grid-template-columns: auto 1fr; }
  .hash button { grid-column: 1 / -1; }
  .footer-grid { grid-template-columns: 1fr; gap: 22px; }
  .footer-grid > div { flex-wrap: wrap; }
  .footer-bottom { align-items: flex-start; flex-direction: column; gap: 7px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}