/* NeuralThermal review site (v3). Brand colours from input-brand/tokens.css; type follows the v3 brief and Apple's Chinese
   site typography: system SF / PingFang SC, large calm sizes, no letter-spacing on Chinese, no small all-caps labels carrying
   meaning, generous whitespace, no motion. Layout keeps the film storyboard rhythm: text column + large picture, alternating. */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --canvas: #FAFBFC; --bg: #F2F4F5; --surface: #FFFFFF; --fg: #16181A; --muted: #5E676D; --line: #DFE3E6;
  --nav: #33206B; --on-dark: #FFFFFF; --on-dark-muted: #C9D3DA;
  --blue: #1F5FA8; --thermal: #3FA21C; --ai: #8A5BE0; --ai-deep: #6A3FC4; --cool: #0F8C8C;
  --green: #76B900; --green-ink: #4C7A00; --lime: #DCFF9A;
  --tint-blue: #E7EFF9; --tint-ai: #EEE7FB; --tint-thermal: #E5F3DE; --tint-cool: #E2F2F2;
  --r: 6px; --r-lg: 18px;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--canvas); color: var(--fg); font: 400 20px/1.6 var(--font-sans); font-variant-numeric: tabular-nums; -webkit-font-smoothing: antialiased; overflow-x: hidden; letter-spacing: 0; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { margin: 0; font-weight: 600; line-height: 1.25; text-wrap: balance; letter-spacing: 0; }
:lang(en) h1, :lang(en) h2 { letter-spacing: -0.01em; }
p, ul, ol { margin: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--green); outline-offset: 2px; }
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 12px; top: -60px; background: var(--surface); padding: 8px 12px; z-index: 50; border-radius: var(--r); }
.skip:focus { top: 8px; }
main:focus { outline: none; }
.wrap { max-width: 1200px; margin: 0 auto; padding-inline: 40px; }

/* ---------------------------------------------------------------- nav (brand bar + green rule) */
.nav { position: sticky; top: 0; z-index: 30; background: var(--nav); border-bottom: 3px solid var(--green); }
.nav-in { min-height: 68px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--on-dark); font: 700 21px/1 var(--font-sans); flex: none; }
.brand:hover { text-decoration: none; }
.brand svg.mark { width: 28px; height: 28px; background: #FFF; border-radius: 6px; padding: 4px; box-sizing: content-box; }
.brand .t { height: .72em; width: .62em; margin-inline: .01em; vertical-align: baseline; }
.brand.dark { color: var(--fg); }
.brand.dark svg.mark { border: 1px solid var(--line); }
.nav-links { display: flex; align-items: center; gap: 4px 28px; flex: 1; font-size: 17px; }
.nav-links > a { color: var(--on-dark-muted); padding: 10px 0; border-bottom: 2px solid transparent; }
.nav-links > a:hover { color: var(--lime); text-decoration: none; }
.nav-links > a[aria-current] { color: var(--on-dark); border-bottom-color: var(--green); }
.nav-right { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.lang { min-width: 56px; min-height: 42px; border: 1px solid rgba(255, 255, 255, .4); background: transparent; color: var(--on-dark); border-radius: var(--r); padding: 4px 14px; cursor: pointer; font-weight: 600; font-size: 17px; }
.lang:hover { border-color: var(--lime); color: var(--lime); }
.burger { display: none; margin-left: auto; background: transparent; border: 1px solid rgba(255, 255, 255, .4); color: var(--on-dark); border-radius: var(--r); min-height: 44px; padding: 4px 14px; gap: 10px; align-items: center; cursor: pointer; font-size: 17px; }
.burger span { width: 18px; height: 2px; background: currentColor; box-shadow: 0 -6px currentColor, 0 6px currentColor; }

/* ---------------------------------------------------------------- buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 52px; padding: 12px 26px; border-radius: 999px; font-weight: 600; font-size: 18px; border: 1px solid transparent; cursor: pointer; }
.btn:hover { text-decoration: none; }
.btn.primary { background: var(--green); color: #0A0E13; }
.btn.primary:hover { background: #86CC0A; }
.btn.ghost { background: var(--surface); color: var(--fg); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--green); }
.btn.small { min-height: 42px; padding: 6px 18px; font-size: 17px; }

/* ---------------------------------------------------------------- type helpers */
.label { font-size: 22px; font-weight: 600; color: var(--blue); margin-bottom: 20px; }
.label .n { color: var(--muted); font-weight: 400; margin-right: 12px; }
.code { font-size: 17px; color: var(--muted); }
.lead { font-size: 24px; line-height: 1.5; color: var(--muted); max-width: 32em; margin-top: 16px; }
.more { font-weight: 600; color: var(--blue); }
.note { color: var(--muted); font-size: 18px; margin-top: 40px; max-width: 46em; }
.center { text-align: center; margin-top: 56px; }
.band { padding-block: 128px; }
.band h2 { font-size: clamp(30px, 3.2vw, 42px); margin-bottom: 48px; max-width: 22em; }
.band.alt { background: var(--surface); border-block: 1px solid var(--line); }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; }
.ticks, .crosses { list-style: none; padding: 0; display: grid; gap: 14px; }
.ticks li, .crosses li { position: relative; padding-left: 28px; }
.ticks li::before { content: ''; position: absolute; left: 2px; top: .62em; width: 9px; height: 9px; border-radius: 50%; background: var(--thermal); }
.crosses { margin-top: 18px; }
.crosses li { color: var(--muted); }
.crosses li::before { content: '×'; position: absolute; left: 1px; top: 0; color: #B3261E; font-weight: 700; }
.badge { display: inline-flex; align-items: center; font-size: 16px; line-height: 1.2; padding: 6px 12px; border-radius: 99px; border: 1px solid var(--line); color: var(--muted); background: var(--surface); white-space: nowrap; }
a.badge:hover { border-color: var(--blue); text-decoration: none; }
.badge.ev-paper { border-color: #9DB7DA; color: var(--blue); }
.badge.ev-public { border-color: #9FD08A; color: var(--green-ink); }
.badge.ev-model { border-color: #C5B0F0; color: var(--ai-deep); }
.badge.warn { border-color: #E3B866; color: #8A5A00; background: #FFF8E8; }
.badge.prod { color: #fff; border-color: transparent; font-weight: 600; }
.badge.prod.c-blue { background: var(--blue); }
.badge.prod.c-thermal { background: #2F7D14; }
.badge.prod.c-ai { background: var(--ai-deep); }
.ev-line { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 20px; }
.ev-line .more { margin-left: 6px; }

/* ---------------------------------------------------------------- hero */
.hero-in { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 6fr); align-items: center; gap: 48px; min-height: min(760px, calc(100vh - 71px)); padding-block: 64px; }
.hero h1 { font-size: clamp(36px, 4vw, 56px); line-height: 1.2; color: var(--nav); }
.hero .sub { font-size: 24px; color: var(--muted); margin-top: 24px; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 40px; }
.hero-pic { margin: 0; }
.hero-pic img { width: 100%; border-radius: var(--r-lg); }
.hero-pic figcaption { font-size: 16px; color: var(--muted); margin-top: 10px; }

/* ---------------------------------------------------------------- industry tiles */
.ind-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.ind-tile { display: grid; grid-template-rows: auto 1fr; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; color: var(--fg); }
.ind-tile:hover { text-decoration: none; border-color: var(--green); }
.ind-pic { aspect-ratio: 16 / 9; overflow: hidden; background: #FDFDFD; border-bottom: 1px solid var(--line); }
.ind-pic img { width: 100%; height: 100%; object-fit: cover; }
.ind-body { padding: 32px 36px 36px; display: grid; gap: 12px; align-content: start; }
.ind-body h3 { font-size: 32px; }
.ind-body p { color: var(--muted); }

/* ---------------------------------------------------------------- product rows */
.prod-list { display: grid; border-top: 1px solid var(--line); }
.prod-row { display: grid; grid-template-columns: 170px 280px 1fr; gap: 28px; align-items: baseline; padding: 36px 8px; border-bottom: 1px solid var(--line); color: var(--fg); }
.prod-row:hover { text-decoration: none; background: var(--canvas); }
.prod-row h3 { font-size: 28px; }
.prod-row p { color: var(--muted); }
.prod-code { font-size: 18px; font-weight: 700; }
.c-blue .prod-code { color: var(--blue); }
.c-thermal .prod-code { color: var(--green-ink); }
.c-ai .prod-code { color: var(--ai-deep); }

/* ---------------------------------------------------------------- storyboard rows */
.story { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 64px; align-items: center; padding-block: 64px; border-top: 1px solid var(--line); scroll-margin-top: 90px; }
.story:first-of-type { border-top: 0; padding-top: 16px; }
.story.flip .story-text { order: 2; }
.story.nopic { grid-template-columns: minmax(0, 1fr); }
.story.focus { background: var(--tint-blue); border-radius: var(--r-lg); padding-inline: 32px; }
.story h3 { font-size: clamp(26px, 2.4vw, 32px); line-height: 1.3; }
.story .label { font-size: 22px; color: var(--fg); }
.story .label .n { color: var(--blue); font-weight: 600; }
.story .body { color: var(--muted); margin-top: 16px; }
.story-pic img.shot { width: 100%; border-radius: var(--r-lg); background: #FDFDFD; }
.metric { display: grid; gap: 4px; margin-top: 28px; }
.metric b { font-size: 40px; line-height: 1.1; font-weight: 700; color: var(--ai-deep); }
.metric.big b { font-size: clamp(44px, 4.6vw, 68px); }
.metric .ml { font-size: 20px; color: var(--fg); }
.metric .mc { font-size: 18px; color: var(--muted); }
.metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 40px; }
.metrics .metric { margin-top: 0; padding-top: 20px; border-top: 2px solid var(--line); }
.metrics .metric:nth-child(2) b { color: var(--cool); }

/* ---------------------------------------------------------------- film excerpt (poster first, video on click) */
.clip { position: relative; margin: 0; border-radius: var(--r-lg); overflow: hidden; background: #FDFDFD; border: 1px solid var(--line); }
.clip img, .clip video { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; display: block; }
.clip .play { position: absolute; left: 18px; bottom: 58px; display: inline-flex; align-items: center; gap: 10px; min-height: 48px; padding: 8px 20px 8px 10px; border: 0; border-radius: 99px; background: rgba(51, 32, 107, .92); color: #fff; font-weight: 600; font-size: 17px; cursor: pointer; }
.clip .play span { width: 30px; height: 30px; border-radius: 50%; background: var(--green); color: #0A0E13; display: grid; place-items: center; font-size: 12px; }
.clip figcaption { font-size: 16px; color: var(--muted); padding: 10px 16px; background: var(--surface); border-top: 1px solid var(--line); }

/* ---------------------------------------------------------------- tools */
.tool { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 56px; align-items: center; padding-block: 32px; }
.tool.flip .tool-shot { order: 2; }
.tool-shot { display: block; border-radius: var(--r-lg); overflow: hidden; border: 1px solid var(--line); }
.tool-text h3 { font-size: 30px; margin-bottom: 14px; }
.tool-text .scope-note { font-size: 18px; color: var(--muted); margin: 16px 0 24px; padding-left: 14px; border-left: 3px solid var(--cool); }

/* ---------------------------------------------------------------- flow (circles on a line) */
.flow { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; position: relative; }
.flow::before { content: ''; position: absolute; left: 24px; right: calc(20% - 24px); top: 23px; height: 2px; background: var(--line); }
.flow li { position: relative; display: grid; gap: 14px; align-content: start; }
.flow .node { width: 48px; height: 48px; border-radius: 50%; display: grid; place-items: center; background: var(--surface); border: 2px solid var(--blue); color: var(--blue); font-weight: 700; }
.flow li:first-child .node { background: var(--blue); color: #fff; }
.flow b { font-size: 20px; font-weight: 600; }

/* ---------------------------------------------------------------- CTA */
.cta { background: var(--nav); color: var(--on-dark); border-top: 3px solid var(--green); }
.cta-in { display: flex; align-items: center; justify-content: space-between; gap: 40px; padding-block: 80px; }
.cta h2 { font-size: clamp(28px, 2.8vw, 38px); }
.cta p { color: var(--on-dark-muted); margin-top: 12px; max-width: 34em; }

/* ---------------------------------------------------------------- page heads */
.page-head { padding: 80px 0 64px; border-bottom: 1px solid var(--line); background: var(--canvas); }
.page-head h1 { font-size: clamp(34px, 4vw, 52px); line-height: 1.2; color: var(--nav); max-width: 22em; }
.page-head .label { margin-bottom: 12px; }
.crumbs { font-size: 17px; color: var(--muted); margin-bottom: 24px; }
.crumbs a { color: var(--muted); }
.case-head-in { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 6fr); gap: 56px; align-items: center; }
.case-pic img.shot { border-radius: var(--r-lg); background: #FDFDFD; }

.ind-hero { background: var(--canvas); border-bottom: 1px solid var(--line); }
.ind-hero-in { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 56px; align-items: center; padding-block: 72px 48px; }
.ind-hero h1 { font-size: clamp(34px, 4vw, 52px); line-height: 1.2; color: var(--nav); }
.ind-hero-pic img { border-radius: var(--r-lg); }
.ind-tabs { display: flex; gap: 4px 32px; flex-wrap: wrap; border-top: 1px solid var(--line); font-size: 18px; }
.ind-tabs a { padding: 16px 0; color: var(--muted); border-bottom: 3px solid transparent; font-weight: 600; }
.ind-tabs a[aria-current] { color: var(--fg); border-bottom-color: var(--green); }
.ind-tabs a:hover { text-decoration: none; color: var(--fg); }
.related { margin-top: 24px; display: flex; gap: 10px 28px; flex-wrap: wrap; font-weight: 600; }

/* product page */
.big-p { font-size: clamp(24px, 2.4vw, 30px); line-height: 1.5; max-width: 30em; }
.io { display: grid; grid-template-columns: 1fr 56px 1fr; gap: 24px; align-items: start; padding: 40px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); margin-block: 56px; }
.io .arrow { font-size: 36px; color: var(--blue); align-self: center; text-align: center; }
.bounds-box { background: #FFF8E8; border: 1px solid #F0D9A8; border-radius: var(--r-lg); padding: 28px 32px; }
.bounds-box .label { color: #8A5A00; }
.pilot { margin-block: 64px; }

/* case library */
.filters { display: grid; gap: 16px; margin-bottom: 32px; }
.fgroup { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.fgroup > span { width: 120px; font-size: 18px; font-weight: 600; color: var(--muted); }
.chip { min-height: 44px; padding: 6px 16px; border-radius: 99px; border: 1px solid var(--line); background: var(--surface); font-size: 17px; cursor: pointer; }
.chip[aria-pressed="true"] { background: var(--fg); color: #fff; border-color: var(--fg); }
.search input { width: 100%; max-width: 560px; min-height: 52px; padding: 8px 16px; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); font-size: 18px; }
.count { font-size: 18px; color: var(--muted); margin-bottom: 8px; }
.case-rows { list-style: none; padding: 0; display: grid; border-top: 1px solid var(--line); }
.case-row > a, .case-row.idx { display: grid; grid-template-columns: 220px 1fr; gap: 28px; padding: 24px 0; border-bottom: 1px solid var(--line); color: var(--fg); align-items: center; }
.case-row > a:hover { text-decoration: none; background: var(--canvas); }
.case-row .thumb { width: 220px; aspect-ratio: 16 / 10; object-fit: contain; background: #FDFDFD; border: 1px solid var(--line); border-radius: 12px; }
.case-row .thumb.ph { display: grid; place-items: center; font-size: 30px; font-weight: 700; color: var(--muted); background: var(--bg); border: 0; }
.thumb.ph.c-ai { background: var(--tint-ai); color: var(--ai-deep); }
.thumb.ph.c-cool { background: var(--tint-cool); color: var(--cool); }
.thumb.ph.c-thermal { background: var(--tint-thermal); color: var(--green-ink); }
.thumb.ph.c-blue { background: var(--tint-blue); color: var(--blue); }
.case-row.idx { grid-template-columns: 120px 1fr; }
.case-row.idx .thumb.ph { width: 120px; font-size: 22px; }
.case-row h3 { font-size: 22px; margin-top: 4px; }
.case-row .m { margin-top: 6px; color: var(--muted); }
.case-row .m b { color: var(--ai-deep); }
.case-row .ev-line { margin-top: 12px; }
.empty { padding: 24px 0; color: var(--muted); }
.case-row.compact > a { grid-template-columns: 64px minmax(0, 1fr) auto auto; gap: 20px; align-items: baseline; }
.case-row.compact .cid { color: var(--muted); font-weight: 600; }
.case-row.compact h3 { margin: 0; font-size: 21px; }
.case-row.compact .m { margin: 0; white-space: nowrap; }
@media (max-width: 760px) { .case-row.compact > a { grid-template-columns: 1fr; gap: 6px; } .case-row.compact .m { white-space: normal; } .case-row.compact .badge { justify-self: start; } }

/* case page */
.case-body { display: grid; gap: 48px; max-width: 1000px; }
.more-info { border-top: 1px solid var(--line); padding-top: 24px; }
.more-info summary { cursor: pointer; font-size: 22px; font-weight: 600; color: var(--blue); min-height: 44px; }
.more-info p { margin-top: 16px; }
.more-info .src { color: var(--muted); font-size: 18px; }

/* engage */
.tiers { display: grid; grid-template-columns: repeat(4, 1fr); gap: 36px; }
.tier { display: grid; gap: 10px; align-content: start; border-top: 3px solid var(--blue); padding-top: 20px; }
.tier b { font-size: 24px; font-weight: 600; }
.tier p { color: var(--muted); }

/* contact */
.contact form { display: grid; gap: 22px; }
.contact label { display: grid; gap: 8px; font-weight: 600; font-size: 18px; }
.contact form, .contact label { min-width: 0; }
.contact select, .contact textarea { width: 100%; max-width: 100%; min-width: 0; font-weight: 400; min-height: 52px; padding: 10px 14px; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); font-size: 18px; }
.contact textarea { resize: vertical; }
.contact .btn { justify-self: start; }
.status { min-height: 1.6em; color: var(--green-ink); font-size: 18px; }
.mailbox { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 32px; align-self: start; }
.mailbox .addr { font-size: 24px; font-weight: 600; margin-bottom: 18px; word-break: break-all; }

/* footer */
.foot { background: var(--surface); border-top: 1px solid var(--line); padding-block: 56px; font-size: 17px; }
.foot-in { display: grid; grid-template-columns: 1.2fr 1fr 1fr 1.4fr; gap: 32px; }
.foot nav { display: grid; gap: 10px; align-content: start; }
.foot nav a { color: var(--fg); }
.foot p { color: var(--muted); margin-bottom: 8px; }

@media print { .nav, .cta { position: static; } }

/* ---------------------------------------------------------------- responsive */
@media (max-width: 1060px) {
  .burger { display: inline-flex; }
  .nav-in { flex-wrap: wrap; }
  .nav-links { display: none; flex-basis: 100%; flex-direction: column; align-items: stretch; gap: 0; padding-bottom: 14px; }
  .nav-links.open { display: flex; }
  .nav-links > a { padding: 14px 0; border-bottom: 1px solid rgba(255, 255, 255, .14); font-size: 19px; }
  .nav-links > a[aria-current] { border-bottom-color: var(--green); }
  .nav-right { margin: 14px 0 0; }
  .prod-row { grid-template-columns: 1fr; gap: 8px; }
  .flow { grid-template-columns: 1fr; gap: 22px; }
  .flow::before { left: 23px; right: auto; top: 24px; bottom: 24px; width: 2px; height: auto; }
  .flow li { grid-template-columns: 48px 1fr; column-gap: 18px; align-items: center; }
  .tiers { grid-template-columns: 1fr 1fr; }
  .foot-in { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  body { font-size: 18px; }
  .wrap { padding-inline: 20px; }
  .band { padding-block: 72px; }
  .band h2 { margin-bottom: 32px; }
  .label { font-size: 22px; }
  .lead, .hero .sub { font-size: 20px; }
  .hero-in, .story, .tool, .ind-hero-in, .case-head-in, .two { grid-template-columns: 1fr; gap: 32px; }
  .hero-in { min-height: 0; padding-block: 40px 56px; }
  .story.flip .story-text, .tool.flip .tool-shot { order: 0; }
  .story { padding-block: 48px; }
  .story.focus { padding-inline: 16px; }
  .ind-grid { grid-template-columns: 1fr; gap: 24px; }
  .ind-body { padding: 24px; }
  .ind-body h3 { font-size: 28px; }
  .io { grid-template-columns: 1fr; padding: 24px; }
  .io .arrow { transform: rotate(90deg); }
  .cta-in { flex-direction: column; align-items: flex-start; padding-block: 56px; }
  .case-row > a { grid-template-columns: 1fr; gap: 14px; }
  .case-row .thumb { width: 100%; }
  .case-row.idx { grid-template-columns: 80px 1fr; gap: 16px; }
  .case-row.idx .thumb.ph { width: 80px; font-size: 18px; }
  .fgroup > span { width: 100%; }
  .tiers { grid-template-columns: 1fr; }
  .foot-in { grid-template-columns: 1fr; }
  .page-head { padding: 48px 0 40px; }
  .metric .mc, .note, .tool-text .scope-note, .more-info .src { font-size: 17px; }
  .metrics { grid-template-columns: 1fr; gap: 28px; }
  .clip .play { left: 12px; bottom: 56px; }
}