:root {
  --white: #ffffff;
  --mist: #f3f8f8;
  --mist-strong: #e7f1f1;
  --teal: #0e7c7b;
  --cyan: #00a0af;
  --teal-08: rgba(14, 124, 123, 0.08);
  --line: #d8e6e6;
  --ink: #17272b;
  --ink-70: #48606a;
  --focus: #00a0af;
  --shadow: 0 18px 48px rgba(23, 39, 43, 0.08);
  --sans: -apple-system, BlinkMacSystemFont, "Inter", "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --data: ui-monospace, "SF Mono", "SFMono-Regular", "Menlo", "Consolas", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  background: var(--white);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }

.container {
  width: min(1240px, calc(100% - 48px));
  margin-inline: auto;
}
.skip-link {
  position: fixed;
  left: 20px;
  top: -72px;
  z-index: 100;
  padding: 12px 18px;
  border-radius: 999px;
  background: var(--teal);
  color: var(--white);
  transition: top 0.2s ease;
}
.skip-link:focus { top: 18px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  position: relative;
  display: flex; align-items: center; justify-content: space-between;
  min-height: 76px; gap: 18px;
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand-mark {
  width: 38px; height: 38px; flex: 0 0 auto;
  display: grid; place-items: center;
  border: 1px solid rgba(14, 124, 123, 0.24);
  border-radius: 12px; color: var(--teal);
  background: linear-gradient(145deg, var(--white), var(--mist));
}
.brand-logo { height: 27px; width: auto; display: block; }
.brand-text { display: flex; align-items: baseline; gap: 9px; white-space: nowrap; }
.brand-zh { font-size: 22px; font-weight: 750; letter-spacing: 0.04em; }
.brand-divider { width: 1px; height: 18px; background: var(--line); transform: translateY(3px); }
.brand-en { font-family: var(--data); font-size: 13px; font-weight: 700; letter-spacing: 0.16em; color: var(--teal); }

.primary-nav { display: flex; align-items: center; gap: 4px; }
.primary-nav a {
  padding: 9px 13px; border-radius: 999px;
  font-size: 15px; color: var(--ink-70);
  transition: background 0.2s, color 0.2s;
}
.primary-nav a:hover { background: var(--mist); color: var(--teal); }
.primary-nav a[aria-current="page"] { background: var(--teal-08); color: var(--teal); font-weight: 650; }
.header-actions { display: flex; align-items: center; gap: 8px; }
.lang-switch {
  min-width: 46px; padding: 8px 11px; text-align: center;
  border: 1px solid var(--line); border-radius: 999px;
  font-family: var(--data); font-size: 13px; font-weight: 700;
  transition: border-color 0.2s, background 0.2s;
}
.lang-switch:hover { border-color: var(--cyan); background: var(--mist); }
.menu-button {
  display: none; width: 42px; height: 42px; padding: 0;
  border: 1px solid var(--line); border-radius: 12px; background: var(--white);
}
.menu-button svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; }

.hero {
  padding: 84px 0 86px;
  background:
    linear-gradient(90deg, rgba(243, 248, 248, 0) 53%, var(--mist) 53%),
    radial-gradient(circle at 82% 18%, rgba(0, 160, 175, 0.07), transparent 28%);
}
.hero-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; align-items: center; gap: clamp(28px, 5vw, 68px); }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--data); font-size: 12px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--teal);
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--cyan); }
h1, .page-title {
  margin: 16px 0 20px; font-size: clamp(34px, 6vw, 68px);
  line-height: 1.08; letter-spacing: -0.035em; font-weight: 780;
}
.hero-sub { max-width: 620px; margin: 0 0 30px; color: var(--ink-70); font-size: clamp(17px, 2.3vw, 22px); line-height: 1.6; }
.hero-media { position: relative; }
.hero-photo {
  aspect-ratio: 4 / 3; width: 100%;
  border: 1px solid var(--line); border-radius: 28px;
  overflow: hidden; background: var(--white); box-shadow: var(--shadow);
}
.hero-photo img { width: 100%; height: 100%; object-fit: cover; }
.condition-rail {
  position: absolute; right: 18px; bottom: 18px; left: 18px;
  display: flex; justify-content: space-between; gap: 12px;
  padding: 16px 22px; border: 1px solid var(--line); border-radius: 20px;
  background: rgba(255, 255, 255, 0.92); backdrop-filter: blur(10px);
}
.condition-item { min-width: 0; }
.condition-label { display: block; font-family: var(--data); font-size: 11px; letter-spacing: 0.11em; text-transform: uppercase; color: var(--ink-70); }
.condition-value { font-family: var(--data); font-size: clamp(16px, 2vw, 22px); font-weight: 700; color: var(--teal); white-space: nowrap; }
.button {
  display: inline-flex; align-items: center; gap: 10px;
  min-height: 48px; padding: 12px 24px; border: 0; border-radius: 999px;
  background: var(--teal); color: var(--white); font-weight: 650;
  transition: background 0.2s, transform 0.2s;
}
.button:hover { background: #0a6766; transform: translateY(-1px); }
.button svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.ghost-button {
  display: inline-flex; align-items: center; gap: 9px; min-height: 44px;
  padding: 10px 18px; border: 1px solid var(--teal); border-radius: 999px;
  color: var(--teal); font-weight: 650;
}
.ghost-button:hover { background: var(--teal-08); }

.section { padding: clamp(64px, 9vw, 108px) 0; }
.section.mist { background: var(--mist); }
.section-head { max-width: 780px; margin-bottom: clamp(34px, 5vw, 58px); }
.section-head h2, .section-title {
  margin: 14px 0 16px; font-size: clamp(28px, 4vw, 46px);
  line-height: 1.15; letter-spacing: -0.03em;
}
.section-lead { margin: 0; color: var(--ink-70); font-size: clamp(16px, 2vw, 20px); }

.feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.feature-card {
  min-height: 216px; padding: 30px; border: 1px solid var(--line); border-radius: 24px;
  background: var(--white); transition: border-color 0.2s, transform 0.2s;
}
.feature-card:hover { border-color: rgba(0, 160, 175, 0.45); transform: translateY(-3px); }
.feature-icon {
  width: 50px; height: 50px; display: grid; place-items: center;
  border-radius: 16px; background: var(--mist); color: var(--teal);
}
.feature-icon svg { width: 26px; height: 26px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.feature-card h3 { margin: 22px 0 10px; font-size: 21px; }
.feature-card p { margin: 0; color: var(--ink-70); }

.series-ledger { display: grid; gap: 14px; }
.series-entry {
  display: grid; grid-template-columns: 58px minmax(0, 1fr) auto; align-items: center; gap: 24px;
  padding: 22px 26px; border: 1px solid var(--line); border-radius: 22px;
  background: var(--white); transition: border-color 0.2s;
}
.series-entry:hover { border-color: var(--cyan); }
.series-glyph { width: 46px; height: 46px; border-radius: 14px; background: var(--mist); color: var(--teal); display: grid; place-items: center; }
.series-glyph svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.series-entry h3 { margin: 0 0 6px; font-size: 20px; }
.series-entry p { margin: 0; font-family: var(--data); color: var(--ink-70); font-size: 14px; }
.series-link { flex: 0 0 auto; display: inline-flex; align-items: center; gap: 8px; color: var(--teal); font-weight: 650; }
.series-link svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.cta-band { padding: 58px; border-radius: 32px; background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow); }
.cta-band-inner { display: flex; align-items: center; justify-content: space-between; gap: 36px; }
.cta-band h2 { margin: 10px 0 12px; font-size: clamp(28px, 3.4vw, 42px); }
.cta-band p { margin: 0; color: var(--ink-70); }

.profile-grid { display: grid; grid-template-columns: 0.72fr 1.28fr; gap: clamp(28px, 5vw, 72px); }
.profile-aside { display: grid; align-content: start; gap: 16px; }
.profile-stat { padding: 22px; border-top: 2px solid var(--cyan); background: var(--white); }
.profile-stat strong { display: block; font-family: var(--data); font-size: 28px; color: var(--teal); }
.profile-stat span { color: var(--ink-70); font-size: 14px; }
.profile-copy p { margin-top: 0; max-width: 820px; font-size: clamp(17px, 2vw, 21px); color: var(--ink-70); }

.timeline { position: relative; display: grid; gap: 0; margin-top: 18px; }
.timeline::before { content: ""; position: absolute; left: 77px; top: 18px; bottom: 18px; width: 1px; background: var(--line); }
.timeline-item { display: grid; grid-template-columns: 56px 42px minmax(0, 1fr); align-items: start; gap: 16px; padding: 26px 0; }
.timeline-year { font-family: var(--data); font-weight: 700; color: var(--teal); }
.timeline-dot { width: 13px; height: 13px; margin-top: 9px; border: 3px solid var(--cyan); border-radius: 50%; background: var(--white); justify-self: center; }
.timeline-item p { margin: 0; font-size: 19px; }

.product-group + .product-group { margin-top: clamp(44px, 6vw, 72px); }
.series-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; margin-bottom: 22px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.series-heading h2 { margin: 0; font-size: clamp(22px, 3vw, 32px); }
.series-heading span { font-family: var(--data); font-size: 13px; color: var(--ink-70); }
.product-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.product-card {
  overflow: hidden; border: 1px solid var(--line); border-radius: 24px;
  background: var(--white); transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}
.product-card:hover { border-color: rgba(0, 160, 175, 0.48); box-shadow: var(--shadow); transform: translateY(-3px); }
.product-photo { aspect-ratio: 4 / 3; overflow: hidden; background: var(--mist); }
.product-photo img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.35s ease; }
.product-card:hover .product-photo img { transform: scale(1.03); }
.product-body { padding: 24px; }
.model-code { font-family: var(--data); font-size: 20px; font-weight: 750; color: var(--teal); }
.product-body strong { display: block; margin: 8px 0 12px; font-size: 18px; }
.product-body p { min-height: 54px; margin: 0 0 18px; color: var(--ink-70); }
.product-link { display: inline-flex; align-items: center; gap: 8px; color: var(--teal); font-weight: 650; }
.product-link svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.breadcrumb { padding: 24px 0 0; font-family: var(--data); font-size: 13px; color: var(--ink-70); }
.breadcrumb a { color: var(--teal); }
.model-hero { padding: 32px 0 56px; }
.model-hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(30px, 4vw, 62px); align-items: start; }
.model-meta { display: flex; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.meta-pill { padding: 7px 13px; border: 1px solid var(--line); border-radius: 999px; background: var(--mist); color: var(--teal); font-family: var(--data); font-size: 12px; font-weight: 700; }
.model-highlight { max-width: 560px; margin: 0 0 26px; color: var(--ink-70); font-size: 19px; }
.akta-panel {
  margin: 30px 0; padding: 26px; border-left: 4px solid var(--cyan);
  border-radius: 0 20px 20px 0; background: var(--mist);
}
.akta-panel span { display: block; margin-bottom: 5px; font-family: var(--data); font-size: 12px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-70); }
.akta-panel strong { font-size: clamp(26px, 4vw, 42px); color: var(--teal); }

.gallery-main { aspect-ratio: 4 / 3; overflow: hidden; border: 1px solid var(--line); border-radius: 24px; background: var(--white); box-shadow: var(--shadow); }
.gallery-main img { width: 100%; height: 100%; object-fit: cover; }
.gallery-thumbs { display: grid; grid-template-columns: repeat(auto-fill, minmax(68px, 1fr)); gap: 10px; margin-top: 14px; max-height: 260px; overflow: auto; padding-right: 4px; }
.thumb { padding: 0; overflow: hidden; aspect-ratio: 1; border: 2px solid transparent; border-radius: 12px; background: var(--mist); cursor: pointer; }
.thumb img { width: 100%; height: 100%; object-fit: cover; }
.thumb.is-active, .thumb:hover { border-color: var(--cyan); }

.specs { padding-top: 4px; }
.specs-table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 24px; }
.specs-table { width: 100%; border-collapse: collapse; min-width: 620px; }
.specs-table th, .specs-table td { padding: 18px 24px; text-align: left; vertical-align: top; font-size: 16px; }
.specs-table th { width: 290px; color: var(--ink-70); font-weight: 600; background: var(--mist); }
.specs-table td { font-family: var(--data); font-weight: 600; }
.specs-table tr + tr { border-top: 1px solid var(--line); }
.specs-table tbody tr:hover { background: #fbfefe; }

.text-content { max-width: 940px; }
.text-content .large { font-size: clamp(19px, 2.4vw, 25px); line-height: 1.55; }
.text-content p { color: var(--ink-70); }
.dimension-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 32px; margin: 36px 0 56px; padding: 0; list-style: none; }
.dimension-list li { display: flex; gap: 12px; align-items: flex-start; padding: 15px 0; border-bottom: 1px solid var(--line); }
.dimension-list svg { flex: 0 0 auto; width: 19px; height: 19px; margin-top: 5px; fill: none; stroke: var(--cyan); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.process-strip { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); counter-reset: process; }
.process-step { position: relative; padding: 26px 18px 24px 20px; border-left: 1px solid var(--line); background: var(--white); }
.process-step::before { counter-increment: process; content: counter(process, decimal-leading-zero); display: block; margin-bottom: 14px; font-family: var(--data); font-size: 12px; color: var(--cyan); }
.process-step::after { content: ""; position: absolute; top: 31px; left: 0; width: 100%; height: 1px; background: var(--mist-strong); transform: translateX(-18px); }
.process-step strong { display: block; position: relative; z-index: 1; }
.process-step p { margin: 5px 0 0; font-size: 14px; }

.application-list { display: grid; gap: 14px; }
.application-row { display: grid; grid-template-columns: 54px minmax(0, 1fr); gap: 22px; align-items: center; padding: 24px; border: 1px solid var(--line); border-radius: 22px; background: var(--white); }
.application-row .feature-icon { width: 46px; height: 46px; }
.application-row h3 { margin: 0 0 7px; font-size: 21px; }
.application-row p { margin: 0; color: var(--ink-70); }

.quality-list { display: grid; gap: 16px; margin: 0; padding: 0; list-style: none; counter-reset: quality; }
.quality-list li { display: grid; grid-template-columns: 54px minmax(0, 1fr); gap: 18px; align-items: center; min-height: 88px; padding: 22px; border: 1px solid var(--line); border-radius: 22px; background: var(--white); }
.quality-glyph { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 50%; background: var(--mist); color: var(--teal); }
.quality-glyph svg { width: 23px; height: 23px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }

.contact-grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: clamp(28px, 5vw, 64px); align-items: start; }
.contact-card { padding: 32px; border: 1px solid var(--line); border-radius: 28px; background: var(--white); box-shadow: var(--shadow); }
.contact-row { display: grid; gap: 4px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.contact-row:last-child { border-bottom: 0; padding-bottom: 0; }
.contact-label { font-family: var(--data); font-size: 12px; text-transform: uppercase; letter-spacing: 0.11em; color: var(--ink-70); }
.contact-value { font-size: 20px; font-weight: 650; }
.contact-value.placeholder { color: var(--ink-70); font-weight: 500; }
.contact-side p { margin: 0; color: var(--ink-70); font-size: 18px; }

.site-footer { margin-top: 80px; border-top: 1px solid var(--line); background: var(--mist); }
.footer-inner { display: grid; grid-template-columns: 1.4fr 0.8fr 1fr; gap: 40px; padding: 58px 0 52px; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-company { margin: 0; font-size: 19px; font-weight: 700; }
.footer-scope { margin: 8px 0 0; color: var(--ink-70); font-size: 15px; }
.footer-title { margin: 0 0 16px; font-family: var(--data); font-size: 13px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--teal); }
.footer-nav { display: grid; gap: 10px; }
.footer-nav a, .footer-contact address { color: var(--ink-70); font-size: 15px; font-style: normal; }
.footer-nav a:hover, .footer-contact a:hover { color: var(--teal); }
.footer-contact { display: grid; gap: 8px; }
.footer-bottom { border-top: 1px solid var(--line); padding: 18px 0 24px; color: var(--ink-70); font-size: 14px; }
.footer-bottom .container { display: flex; justify-content: space-between; gap: 20px; }

.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 40;
  width: 48px; height: 48px; padding: 0; border: 1px solid var(--line);
  border-radius: 50%; background: var(--white); color: var(--teal);
  box-shadow: var(--shadow); opacity: 0; pointer-events: none; transform: translateY(10px);
  transition: opacity 0.2s, transform 0.2s;
}
.to-top.is-visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.to-top svg { width: 20px; height: 20px; margin: auto; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

@media (max-width: 1080px) {
  .primary-nav a { padding-inline: 8px; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 880px) {
  .container { width: min(1240px, calc(100% - 36px)); }
  .header-inner { min-height: 68px; }
  .menu-button { display: grid; place-items: center; }
  .primary-nav {
    position: absolute; left: 0; right: 0; top: 100%;
    display: none; padding: 12px 18px 18px;
    background: var(--white); border-bottom: 1px solid var(--line); box-shadow: 0 16px 32px rgba(23, 39, 43, 0.08);
  }
  .primary-nav.is-open { display: grid; }
  .primary-nav a { min-height: 44px; padding: 11px 8px; border-radius: 10px; }
  .hero { padding-top: 44px; padding-bottom: 56px; }
  .hero-grid, .profile-grid, .model-hero-grid, .contact-grid { grid-template-columns: 1fr; }
  .hero-media { order: -1; }
  .condition-rail { position: static; margin-top: -48px; margin-inline: 14px; flex-wrap: wrap; }
  .condition-item { flex: 1 0 40%; }
  .feature-grid, .product-grid, .dimension-list { grid-template-columns: 1fr; }
  .series-entry { grid-template-columns: 46px minmax(0, 1fr); }
  .series-link { grid-column: 2; }
  .cta-band { padding: 32px 24px; border-radius: 24px; }
  .cta-band-inner { align-items: flex-start; flex-direction: column; gap: 20px; }
  .timeline::before { left: 17px; }
  .timeline-item { grid-template-columns: 36px minmax(0, 1fr); }
  .timeline-dot { grid-column: 1; grid-row: 1; }
  .timeline-copy { grid-column: 2; }
  .process-strip { grid-template-columns: 1fr; }
  .process-step { border-left: 0; border-top: 1px solid var(--line); }
  .process-step::after { display: none; }
  .footer-inner { grid-template-columns: 1fr; padding-top: 42px; }
  .footer-bottom .container { flex-direction: column; gap: 5px; }
}

@media (max-width: 520px) {
  .container { width: min(1240px, calc(100% - 24px)); }
  .brand-zh { font-size: 19px; }
  .brand-en { display: none; }
  .brand-divider { display: none; }
  .lang-switch { padding-inline: 8px; }
  .condition-rail { padding: 13px; }
  .condition-item { flex: 1 0 100%; }
  .feature-card { min-height: 0; padding: 24px 20px; }
  .series-heading { align-items: flex-start; flex-direction: column; gap: 5px; }
  .specs-table th, .specs-table td { padding: 14px 16px; }
  .contact-card { padding: 24px 20px; }
  .contact-value { font-size: 18px; overflow-wrap: anywhere; }
  .to-top { right: 16px; bottom: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}