:root {
  --navy: #081f38;
  --navy-2: #102d4a;
  --teal: #22b5ac;
  --blue: #5579c6;
  --teal-text: #087d78;
  --blue-text: #365a9f;
  --ice: #f4f7fa;
  --white: #fff;
  --slate: #526980;
  --muted: #7c8fa2;
  --line: #dbe4eb;
  --max: 1200px;
  --radius: 24px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--navy);
  background: var(--ice);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
p { text-wrap: pretty; }
h1, h2, h3, blockquote { text-wrap: balance; }
section[id] { scroll-margin-top: 88px; }
:focus { scroll-margin-top: 96px; scroll-margin-bottom: 72px; }
.shell { width: min(var(--max), calc(100% - 48px)); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
.skip-link { position: fixed; z-index: 100; top: -60px; left: 16px; padding: 12px 18px; color: white; background: var(--navy); border-radius: 8px; }
.skip-link:focus { top: 12px; }
:focus-visible { outline: 3px solid var(--teal); outline-offset: 4px; }

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid rgba(8,31,56,.08);
  background: rgba(244,247,250,.9);
  backdrop-filter: blur(18px);
}
.nav-wrap { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { width: 190px; flex: 0 0 auto; }
.brand img { width: 100%; height: auto; }
.site-nav { display: flex; align-items: center; gap: 30px; color: var(--slate); font-size: 14px; }
.site-nav a { transition: color .2s ease; }
.site-nav a:hover { color: var(--navy); }
.site-nav .nav-cta { min-height: 44px; display: inline-flex; align-items: center; padding: 0 19px; color: white; background: var(--navy); border-radius: 9px; font-weight: 700; }
.menu-button { display: none; width: 44px; height: 44px; padding: 10px; border: 0; background: transparent; cursor: pointer; }
.menu-button span:not(.sr-only) { display: block; width: 24px; height: 2px; margin: 5px 0; background: var(--navy); }

.hero { position: relative; min-height: 780px; overflow: hidden; background: radial-gradient(circle at 73% 42%, rgba(85,121,198,.11), transparent 31%), var(--ice); }
.hero::before { content: ""; position: absolute; inset: 0; opacity: .18; background-image: linear-gradient(rgba(8,31,56,.12) 1px, transparent 1px), linear-gradient(90deg, rgba(8,31,56,.12) 1px, transparent 1px); background-size: 82px 82px; mask-image: linear-gradient(to right, transparent, black 55%, black); }
.hero-grid { position: relative; z-index: 1; min-height: 780px; display: grid; grid-template-columns: 1.03fr .97fr; align-items: center; gap: 70px; padding-block: 110px 90px; }
.hero-grid > * { min-width: 0; }
.kicker { display: flex; align-items: center; gap: 14px; margin: 0 0 24px; color: var(--teal); font: 800 12px/1.2 Arial, sans-serif; letter-spacing: .18em; }
.kicker::before { content: ""; width: 42px; height: 3px; border-radius: 4px; background: currentColor; }
h1 { margin: 0; max-width: 720px; font-size: clamp(52px, 5.8vw, 82px); line-height: 1.08; letter-spacing: -.055em; }
h1 em { color: var(--teal); font-style: normal; }
.hero-lead { max-width: 660px; margin: 28px 0 34px; color: var(--slate); font-size: 18px; line-height: 1.85; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 14px; }
.button { min-height: 52px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 0 24px; border: 1px solid var(--navy); border-radius: 10px; font-weight: 800; cursor: pointer; transition: transform .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button.primary { color: white; background: var(--navy); }
.text-button { border-color: transparent; background: transparent; }
.text-button:hover { background: white; }
.trust-line { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 32px; color: var(--muted); font-size: 13px; }
.trust-line span::before { content: "✓"; margin-right: 7px; color: var(--teal); font-weight: 900; }
.hero-index { position: absolute; right: 3vw; bottom: -68px; color: rgba(8,31,56,.035); font: 900 250px/1 Arial; }

.trace-console { width: 100%; min-width: 0; min-height: 590px; color: white; border: 1px solid rgba(255,255,255,.14); border-radius: 28px; background: var(--navy); box-shadow: 0 35px 80px rgba(8,31,56,.18); overflow: hidden; }
.console-head, .console-foot { min-height: 62px; display: flex; align-items: center; justify-content: space-between; padding: 0 28px; color: #91a7b9; font: 700 11px/1 Arial, sans-serif; letter-spacing: .13em; }
.console-head { border-bottom: 1px solid rgba(255,255,255,.09); }
.console-foot { border-top: 1px solid rgba(255,255,255,.09); letter-spacing: .05em; }
.console-foot strong { color: var(--teal); }
.live { display: flex; align-items: center; gap: 8px; color: var(--teal); }
.live i { width: 7px; height: 7px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 14px var(--teal); animation: pulse 1.8s infinite; }
.trace-stage { position: relative; height: 465px; }
.trace-stage svg { position: absolute; inset: 25px 18px 0; width: calc(100% - 36px); height: 410px; }
.grid-line { fill: none; stroke: rgba(255,255,255,.055); stroke-width: 1; }
.trace-path { fill: none; stroke: url(#traceGradient); stroke-width: 5; stroke-linecap: round; stroke-dasharray: 750; stroke-dashoffset: 750; animation: draw 2.4s .45s ease-out forwards; filter: drop-shadow(0 0 7px rgba(34,181,172,.45)); }
.node { fill: var(--navy); stroke: var(--teal); stroke-width: 5; }
.node-c, .node-d { stroke: var(--blue); }
.trace-label { position: absolute; min-width: 120px; padding: 13px 14px; border: 1px solid rgba(255,255,255,.12); border-radius: 11px; background: rgba(255,255,255,.055); backdrop-filter: blur(8px); }
.trace-label small { display: block; margin-bottom: 5px; color: #8097aa; font: 700 9px Arial; letter-spacing: .12em; }
.trace-label strong { font-size: 14px; }
.label-a { left: 22px; bottom: 28px; }
.label-b { left: 24%; top: 170px; }
.label-c { right: 25%; top: 234px; }
.label-d { right: 20px; top: 42px; border-color: rgba(34,181,172,.36); }

.problem-strip { color: white; background: var(--navy); }
.strip-grid { min-height: 190px; display: grid; grid-template-columns: .8fr 1.2fr; align-items: center; gap: 70px; }
.strip-grid > p { margin: 0; color: #d8e1e8; font-size: 21px; line-height: 1.65; }
.strip-grid ul { display: grid; grid-template-columns: 1fr 1fr; gap: 17px 32px; margin: 0; padding: 0; list-style: none; color: #93a8b9; font-size: 14px; }
.strip-grid li { position: relative; padding-left: 20px; }
.strip-grid li::before { content: ""; position: absolute; left: 0; top: .55em; width: 7px; height: 7px; background: var(--teal); border-radius: 50%; }

.fit-section { padding: 105px 0; background: #eaf1f5; border-bottom: 1px solid var(--line); }
.fit-heading { max-width: 790px; margin-bottom: 48px; }
.fit-heading h2 { margin-top: 16px; }
.fit-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid #cbd8e1; border-left: 1px solid #cbd8e1; }
.fit-card { min-height: 275px; padding: 28px; border-right: 1px solid #cbd8e1; border-bottom: 1px solid #cbd8e1; background: rgba(255,255,255,.34); }
.fit-card > span { color: var(--blue-text); font-size: 12px; font-weight: 800; letter-spacing: .14em; }
.fit-card h3 { margin: 68px 0 12px; font-size: 23px; line-height: 1.35; }
.fit-card p { margin: 0; color: var(--slate); font-size: 14px; line-height: 1.75; }
.fit-note { margin: 28px 0 0; color: var(--slate); font-size: 14px; }
.fit-note::before { content: "判断原则"; margin-right: 12px; color: var(--teal-text); font-weight: 900; }

.section { padding: 120px 0; }
.section-heading { display: grid; grid-template-columns: .9fr 1.1fr; align-items: end; gap: 90px; margin-bottom: 65px; }
.section-no { color: var(--blue-text); font: 800 12px Arial; letter-spacing: .18em; }
.section-no.light { color: var(--teal); }
h2 { margin: 16px 0 0; font-size: clamp(40px, 4.8vw, 64px); line-height: 1.15; letter-spacing: -.045em; }
.section-heading > p { max-width: 600px; margin: 0; color: var(--slate); font-size: 17px; line-height: 1.85; }
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.service-card { min-height: 470px; display: flex; flex-direction: column; padding: 30px; border: 1px solid var(--line); border-radius: var(--radius); background: white; transition: transform .25s ease, box-shadow .25s ease; }
.service-card:hover { transform: translateY(-6px); box-shadow: 0 22px 55px rgba(8,31,56,.09); }
.service-card.featured { color: white; border-color: var(--navy); background: var(--navy); }
.card-top { display: flex; align-items: center; justify-content: space-between; }
.card-top span { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 50%; color: white; background: var(--navy); font: 800 13px Arial; }
.featured .card-top span { color: var(--navy); background: var(--teal); }
.card-top i { color: var(--blue-text); font: 800 10px Arial; letter-spacing: .15em; }
.featured .card-top i { color: var(--teal); }
.service-card h3 { margin: 82px 0 16px; font-size: 36px; letter-spacing: -.03em; }
.service-card p { margin: 0; color: var(--slate); line-height: 1.8; }
.featured p { color: #a8bbc9; }
.service-card ul { margin: 42px 0 0; padding: 0; list-style: none; color: var(--slate); font-size: 14px; }
.featured ul { color: #c0ced8; }
.service-card li { padding: 10px 0; border-top: 1px solid var(--line); }
.featured li { border-color: rgba(255,255,255,.12); }
.service-card li::before { content: "↳"; margin-right: 8px; color: var(--teal); }
.service-link { display: flex; align-items: center; justify-content: space-between; min-height: 48px; margin-top: auto; padding-top: 20px; color: var(--navy); border-top: 1px solid var(--line); font-size: 14px; font-weight: 900; }
.service-link span { color: var(--teal); font-size: 18px; transition: transform .2s ease; }
.service-link:hover span { transform: translateX(4px); }
.featured .service-link { color: white; border-color: rgba(255,255,255,.12); }

.demo-section { padding-top: 0; background: white; }
.demo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.demo-card { min-height: 420px; display: flex; flex-direction: column; padding: 30px; border: 1px solid var(--line); border-radius: var(--radius); background: #f7fafc; }
.demo-card h3 { margin: 58px 0 16px; font-size: 27px; line-height: 1.4; letter-spacing: -.025em; }
.demo-card > p { margin: 0; color: var(--slate); line-height: 1.8; }
.demo-output, .demo-placeholder { min-height: 112px; display: flex; flex-direction: column; justify-content: space-between; gap: 18px; margin-top: auto; padding: 20px; border: 1px solid #cbd8e1; border-radius: 10px; background: white; }
.demo-output small, .demo-placeholder small { color: var(--teal-text); font-size: 11px; font-weight: 900; letter-spacing: .1em; }
.demo-output strong, .demo-placeholder strong { font-size: 15px; line-height: 1.6; }
.demo-placeholder { color: #637888; background-image: linear-gradient(rgba(8,31,56,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(8,31,56,.035) 1px, transparent 1px); background-size: 18px 18px; }

.cases-section { background: #eaf1f5; }
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.case-card { min-height: 430px; display: flex; flex-direction: column; padding: 30px; border: 1px solid #cbd8e1; border-radius: var(--radius); background: white; }
.case-tag { align-self: flex-start; padding: 7px 10px; color: var(--blue-text); border: 1px solid #cbd8e1; border-radius: 7px; font-size: 11px; font-weight: 800; letter-spacing: .08em; }
.case-card h3 { margin: 62px 0 18px; font-size: 27px; line-height: 1.4; letter-spacing: -.025em; }
.case-card > p { margin: 0; color: var(--slate); line-height: 1.8; }
.case-card > p strong { color: var(--navy); }
.case-result { margin-top: auto; padding-top: 23px; border-top: 1px solid var(--line); }
.case-result small { display: block; margin-bottom: 8px; color: var(--teal-text); font-weight: 800; }
.case-result strong { font-size: 18px; line-height: 1.55; }
.cases-cta { min-height: 70px; display: flex; align-items: center; justify-content: space-between; margin-top: 22px; padding: 0 28px; color: white; border-radius: 12px; background: var(--navy); font-weight: 800; }
.cases-cta span { color: var(--teal); font-size: 20px; }

.dark-section { color: white; background: var(--navy); }
.method-grid { display: grid; grid-template-columns: .78fr 1.22fr; gap: 100px; }
.method-copy { position: sticky; top: 130px; align-self: start; }
.method-copy p { max-width: 440px; color: #98adbd; font-size: 17px; line-height: 1.85; }
.inline-link { display: inline-flex; gap: 12px; margin-top: 22px; padding-bottom: 8px; color: var(--teal); border-bottom: 1px solid rgba(34,181,172,.5); font-weight: 800; }
.method-list { margin: 0; padding: 0; list-style: none; }
.method-list li { min-height: 150px; display: grid; grid-template-columns: 86px 1fr; align-items: start; padding: 34px 0; border-top: 1px solid rgba(255,255,255,.13); }
.method-list li:last-child { border-bottom: 1px solid rgba(255,255,255,.13); }
.method-list > li > span { color: var(--teal); font: 800 12px Arial; letter-spacing: .12em; }
.method-list h3 { margin: -8px 0 10px; font-size: 28px; }
.method-list p { margin: 0; color: #93a8b9; line-height: 1.75; }

.deliver-section { background: white; }
.deliver-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.deliver-item { min-height: 260px; padding: 34px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.deliver-item > span { color: var(--teal-text); font: 800 11px Arial; }
.deliver-item h3 { margin: 70px 0 12px; font-size: 28px; }
.deliver-item p { max-width: 430px; margin: 0; color: var(--slate); line-height: 1.75; }

.questions-section { background: #edf3f6; }
.questions-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 100px; align-items: start; }
.questions-heading { position: sticky; top: 130px; }
.questions-heading p { max-width: 470px; color: var(--slate); font-size: 16px; line-height: 1.8; }
.faq-list { border-top: 1px solid #cbd8e1; }
.faq-list details { border-bottom: 1px solid #cbd8e1; }
.faq-list summary { min-height: 92px; display: flex; align-items: center; justify-content: space-between; gap: 20px; cursor: pointer; list-style: none; font-size: 20px; font-weight: 800; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; flex: 0 0 auto; width: 32px; height: 32px; display: grid; place-items: center; color: white; background: var(--navy); border-radius: 50%; font: 500 22px/1 Arial; }
.faq-list details[open] summary::after { content: "−"; background: var(--teal); }
.faq-list details p { max-width: 680px; margin: -4px 52px 28px 0; color: var(--slate); line-height: 1.8; }

.manifesto { padding: 130px 0; background: #e9f0f5; }
.manifesto-grid { display: grid; grid-template-columns: .82fr 1.18fr; align-items: center; gap: 90px; }
.manifesto-system { position: relative; min-height: 470px; display: flex; flex-direction: column; padding: 25px; color: white; border: 1px solid rgba(8,31,56,.12); border-radius: 20px; background: var(--navy); box-shadow: 0 30px 70px rgba(8,31,56,.14); overflow: hidden; }
.manifesto-system::before { content: ""; position: absolute; inset: 0; opacity: .16; background-image: linear-gradient(rgba(255,255,255,.13) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.13) 1px, transparent 1px); background-size: 56px 56px; mask-image: linear-gradient(145deg, black, transparent 72%); }
.system-head { position: relative; z-index: 1; display: grid; grid-template-columns: 34px 1fr auto; align-items: center; gap: 13px; padding-bottom: 20px; border-bottom: 1px solid rgba(255,255,255,.11); color: #8ea4b6; font: 700 9px Arial; letter-spacing: .14em; }
.system-head img { width: 34px; height: 34px; }
.system-head i { color: #69d6ce; font-style: normal; }
.system-head i::before { content: ""; display: inline-block; width: 6px; height: 6px; margin-right: 7px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 12px var(--teal); }
.system-core { position: relative; z-index: 1; flex: 1; display: flex; flex-direction: column; justify-content: center; padding: 45px 22px; }
.system-core strong { display: block; font-size: clamp(38px, 4vw, 55px); line-height: 1.15; letter-spacing: -.045em; }
.system-core small { margin-top: 18px; color: #8ea4b6; font-size: 14px; letter-spacing: .12em; }
.core-line { position: absolute; left: 0; top: 50%; width: 4px; height: 92px; border-radius: 5px; background: linear-gradient(var(--teal), var(--blue)); transform: translateY(-50%); box-shadow: 0 0 20px rgba(34,181,172,.42); }
.system-flow { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; padding: 0; border-top: 1px solid rgba(255,255,255,.11); list-style: none; }
.system-flow li { position: relative; padding: 18px 10px 0; }
.system-flow li + li { border-left: 1px solid rgba(255,255,255,.11); }
.system-flow span { display: block; margin-bottom: 7px; color: var(--teal); font: 800 9px Arial; }
.system-flow strong { color: #dce6ed; font-size: 12px; }
.manifesto-copy blockquote { margin: 24px 0 30px; font-size: clamp(38px, 4.5vw, 61px); line-height: 1.28; letter-spacing: -.045em; font-weight: 800; }
.manifesto-copy > p { max-width: 720px; color: var(--slate); font-size: 17px; line-height: 1.85; }
.manifesto-copy dl { display: grid; grid-template-columns: 1fr 1.5fr; gap: 20px; margin: 38px 0 0; }
.manifesto-copy dl div { padding-top: 17px; border-top: 1px solid #c9d5de; }
.manifesto-copy dt { color: var(--slate); font-size: 12px; font-weight: 700; }
.manifesto-copy dd { margin: 8px 0 0; font-weight: 800; }

.contact-section { padding: 120px 0; color: white; background: linear-gradient(135deg, #0d2d4a, #071b31); }
.contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; align-items: center; gap: 90px; }
.contact-copy h2 { font-size: clamp(38px, 4.2vw, 58px); }
.contact-copy p { max-width: 670px; color: #9eb1c0; font-size: 17px; line-height: 1.85; }
.wechat-qr { width: 160px; height: 160px; display: grid; place-items: center; padding: 7px; border-radius: 10px; background: white; overflow: hidden; }
.wechat-qr img { width: 100%; height: 100%; object-fit: cover; color: var(--navy); font-size: 12px; text-align: center; }
.wechat-qr img[hidden] { display: none; }
.wechat-qr.is-missing::after { content: "二维码待上传"; color: var(--slate); font-size: 12px; font-weight: 800; }
.contact-card { padding: 34px; color: var(--navy); background: white; border-radius: 22px; box-shadow: 0 28px 75px rgba(0,0,0,.18); }
.form-head { margin-bottom: 25px; }
.contact-label { margin: 0 0 12px; color: var(--blue-text); font: 800 11px Arial; letter-spacing: .16em; }
.contact-card h3 { margin: 0; font-size: 30px; }
.form-head > p:last-child { margin: 10px 0 0; color: var(--slate); font-size: 14px; line-height: 1.7; }
.lead-form label { display: block; margin-bottom: 17px; }
.lead-form label > span { display: block; margin-bottom: 8px; color: #405a72; font-size: 13px; font-weight: 800; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.lead-form input, .lead-form textarea { width: 100%; border: 1px solid #cfdbe4; border-radius: 10px; color: var(--navy); background: #f8fafc; font: inherit; transition: border-color .2s ease, box-shadow .2s ease, background .2s ease; }
.lead-form input { height: 50px; padding: 0 14px; }
.lead-form textarea { min-height: 112px; padding: 13px 14px; resize: vertical; line-height: 1.65; }
.lead-form input::placeholder, .lead-form textarea::placeholder { color: #8a9baa; }
.lead-form input:focus, .lead-form textarea:focus { outline: 0; border-color: var(--teal-text); background: white; box-shadow: 0 0 0 3px rgba(34,181,172,.13); }
.form-trap { position: absolute; left: -9999px; }
.contact-button { width: 100%; margin-top: 2px; border-color: var(--navy); color: white; background: var(--navy); }
.contact-button i { font-style: normal; font-size: 19px; transition: transform .2s ease; }
.contact-button:hover i { transform: translateX(4px); }
.contact-button:disabled { cursor: wait; opacity: .72; transform: none; }
.form-status { min-height: 22px; margin: 11px 0 -3px; color: var(--teal-text); font-size: 13px; font-weight: 700; text-align: center; }
.form-status.error { color: #a62e26; }
.privacy-note { margin: 16px 0 0; color: var(--slate); font-size: 12px; text-align: center; }

footer { padding: 25px 0; color: #91a5b6; background: #051525; font-size: 13px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; }

.video-dialog { width: min(900px, calc(100% - 28px)); max-height: calc(100dvh - 60px); padding: 0; border: 0; border-radius: 18px; color: white; background: #061728; overflow: auto; }
.video-dialog::backdrop { background: rgba(3,12,21,.84); backdrop-filter: blur(7px); }
.video-dialog video { width: 100%; display: block; border-radius: 18px; }
.dialog-close { position: absolute; z-index: 2; right: -10px; top: -48px; width: 40px; height: 40px; border: 1px solid rgba(255,255,255,.3); border-radius: 50%; color: white; background: rgba(255,255,255,.08); font-size: 25px; cursor: pointer; }
.video-transcript { padding: 16px 22px 20px; }
.video-transcript summary { cursor: pointer; color: var(--teal); font-weight: 800; }
.video-transcript p { margin: 13px 0 0; color: #b8c7d2; font-size: 14px; line-height: 1.8; }
.mobile-contact-bar { display: none; }
.reveal { opacity: 1; transform: none; }

@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes pulse { 50% { opacity: .35; transform: scale(.75); } }

@media (max-width: 960px) {
  .site-nav { display: none; position: absolute; inset: 78px 0 auto; padding: 24px; background: var(--ice); border-bottom: 1px solid var(--line); box-shadow: 0 20px 30px rgba(8,31,56,.1); }
  .site-nav.open { display: flex; flex-direction: column; align-items: stretch; }
  .site-nav a { padding: 11px 0; }
  .site-nav .nav-cta { justify-content: center; margin-top: 8px; }
  .menu-button { display: block; }
  .hero-grid, .section-heading, .method-grid, .manifesto-grid, .contact-grid { grid-template-columns: 1fr; }
  .hero-grid { gap: 55px; padding-block: 90px; }
  .hero { min-height: auto; }
  .trace-console { width: min(650px, 100%); }
  .strip-grid { padding-block: 40px; grid-template-columns: 1fr; gap: 25px; }
  .fit-grid { grid-template-columns: repeat(2, 1fr); }
  .service-grid { grid-template-columns: 1fr; }
  .demo-grid { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: 1fr; }
  .service-card { min-height: 380px; }
  .section-heading { gap: 30px; }
  .method-copy { position: static; }
  .questions-grid { grid-template-columns: 1fr; gap: 45px; }
  .questions-heading { position: static; }
  .manifesto-system { width: min(560px, 100%); }
  .contact-grid { gap: 55px; }
}

@media (max-width: 620px) {
  .shell { width: min(var(--max), calc(100% - 28px)); }
  .nav-wrap { min-height: 68px; }
  .brand { width: 158px; }
  .site-nav { top: 68px; }
  .hero-grid { padding: 65px 0 70px; }
  h1 { font-size: 48px; }
  .hero-lead { font-size: 16px; }
  .hero-actions .button { width: 100%; }
  .trust-line { gap: 11px; flex-direction: column; }
  .trace-console { min-height: 500px; }
  .trace-stage { height: 375px; }
  .trace-stage svg { height: 330px; }
  .trace-label { min-width: auto; padding: 9px 10px; }
  .trace-label strong { font-size: 11px; }
  .label-b { left: 18%; top: 138px; }
  .label-c { right: 19%; top: 190px; }
  .console-foot { font-size: 9px; padding-inline: 18px; }
  .strip-grid ul { grid-template-columns: 1fr; }
  .fit-section { padding: 76px 0; }
  .fit-grid { grid-template-columns: 1fr; }
  .fit-card { min-height: 220px; }
  .fit-card h3 { margin-top: 42px; }
  .section { padding: 82px 0; }
  .section-heading { margin-bottom: 42px; }
  h2 { font-size: 40px; }
  .service-card { min-height: 420px; padding: 25px; }
  .service-card h3 { margin-top: 58px; }
  .demo-card { min-height: 390px; padding: 25px; }
  .demo-card h3 { margin-top: 48px; }
  .case-card { min-height: 390px; padding: 25px; }
  .case-card h3 { margin-top: 48px; }
  .cases-cta { align-items: flex-start; gap: 18px; padding: 20px; line-height: 1.6; }
  .method-list li { grid-template-columns: 55px 1fr; }
  .deliver-grid { grid-template-columns: 1fr; }
  .deliver-item { min-height: 225px; }
  .deliver-item h3 { margin-top: 50px; }
  .manifesto { padding: 85px 0; }
  .manifesto-grid { gap: 55px; }
  .manifesto-copy dl { grid-template-columns: 1fr; }
  .manifesto-system { min-height: 410px; padding: 20px; }
  .system-core { padding-inline: 18px; }
  .system-flow strong { font-size: 11px; }
  .contact-section { padding: 82px 0; }
  .contact-card { padding: 27px 22px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .footer-bottom { flex-direction: column; }
  .faq-list summary { min-height: 82px; font-size: 17px; }
  .faq-list details p { margin-right: 0; }
  .mobile-contact-bar {
    position: fixed;
    z-index: 45;
    left: 12px;
    right: 12px;
    bottom: max(12px, env(safe-area-inset-bottom));
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 8px;
    border: 1px solid rgba(255,255,255,.14);
    border-radius: 15px;
    background: rgba(8,31,56,.94);
    box-shadow: 0 12px 35px rgba(8,31,56,.3);
    backdrop-filter: blur(14px);
    transition: opacity .2s ease, transform .2s ease;
  }
  .mobile-contact-bar.is-hidden { opacity: 0; transform: translateY(24px); pointer-events: none; }
  .mobile-contact-bar a {
    min-height: 46px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 9px;
    font-weight: 900;
  }
  .mobile-contact-bar a { color: var(--navy); background: var(--teal); }
  footer { padding-bottom: 105px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .trace-path { stroke-dashoffset: 0; }
}