:root {
  --ink: #153448;
  --ink-soft: #4f6470;
  --brand: #0c5a4a;
  --brand-deep: #083f37;
  --brand-soft: #eaf5f1;
  --gold: #cdb77f;
  --paper: #f7f4ee;
  --white: #ffffff;
  --line: rgba(21, 52, 72, 0.12);
  --shadow: 0 24px 64px rgba(18, 55, 58, 0.12);
  --radius-lg: 32px;
  --radius-md: 22px;
  --radius-sm: 14px;
  --container: min(1180px, calc(100% - 48px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 88% 6%, rgba(205, 183, 127, 0.15), transparent 28%),
    radial-gradient(circle at 4% 42%, rgba(12, 90, 74, 0.08), transparent 30%);
  z-index: -1;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; }

.container { width: var(--container); margin: 0 auto; }
.section { padding: 104px 0; }
.section-tight { padding: 72px 0; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 18px;
  color: var(--brand);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 30px; height: 1px; background: currentColor; }
.display {
  margin: 0;
  font-family: "Noto Serif CJK SC", "Songti SC", serif;
  font-weight: 650;
  font-size: clamp(46px, 6.4vw, 82px);
  line-height: 1.08;
  letter-spacing: -0.04em;
}
.section-title {
  margin: 0;
  font-family: "Noto Serif CJK SC", "Songti SC", serif;
  font-size: clamp(34px, 4vw, 54px);
  line-height: 1.18;
  letter-spacing: -0.03em;
}
.section-lead {
  max-width: 650px;
  margin: 22px 0 0;
  color: var(--ink-soft);
  font-size: 18px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(255,255,255,0.55);
  background: rgba(247, 244, 238, 0.84);
  backdrop-filter: blur(18px);
}
.header-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand-lockup { display: inline-flex; align-items: center; min-width: 148px; }
.brand-text strong { display: block; font-size: 18px; line-height: 1.12; letter-spacing: 0.035em; }
.brand-text span { display: block; margin-top: 5px; color: var(--ink-soft); font-size: 10px; letter-spacing: 0.18em; }
.site-nav { display: flex; align-items: center; gap: 34px; font-size: 15px; }
.site-nav a { color: var(--ink-soft); transition: color .2s ease; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--brand); }
.nav-cta {
  padding: 11px 18px;
  border: 1px solid rgba(12,90,74,.24);
  border-radius: 999px;
  color: var(--brand) !important;
  font-weight: 700;
}
.menu-toggle { display: none; border: 0; background: transparent; padding: 8px; color: var(--ink); }

.hero { padding: 82px 0 58px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.03fr .97fr; gap: 66px; align-items: center; }
.hero-copy .display em { color: var(--brand); font-style: normal; }
.hero-copy p { max-width: 610px; margin: 28px 0 0; color: var(--ink-soft); font-size: 19px; }
.hero-actions { display: flex; align-items: center; gap: 14px; margin-top: 34px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 50px;
  padding: 0 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary { color: white; background: var(--brand); box-shadow: 0 14px 30px rgba(12, 90, 74, .22); }
.button-secondary { color: var(--ink); border-color: var(--line); background: rgba(255,255,255,.68); }
.hero-note { display: flex; gap: 24px; margin-top: 44px; color: var(--ink-soft); font-size: 14px; }
.hero-note span { display: flex; align-items: center; gap: 8px; }
.hero-note i { width: 7px; height: 7px; border-radius: 50%; background: var(--gold); }

.hero-art {
  position: relative;
  min-height: 620px;
  display: grid;
  place-items: center;
}
.hero-orbit {
  position: absolute;
  width: 520px;
  height: 520px;
  border: 1px solid rgba(12,90,74,.14);
  border-radius: 50%;
}
.hero-orbit::before, .hero-orbit::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(205,183,127,.25);
}
.hero-orbit::before { inset: 58px; }
.hero-orbit::after { inset: 116px; }
.product-emblem {
  position: absolute;
  top: 18px;
  right: 28px;
  width: 134px;
  padding: 12px;
  border-radius: 30px;
  background: rgba(255,255,255,.88);
  box-shadow: var(--shadow);
  transform: rotate(4deg);
  z-index: 3;
}
.product-emblem img { border-radius: 24px; }
.phone {
  position: relative;
  width: 286px;
  padding: 10px;
  border-radius: 42px;
  background: #0a332d;
  box-shadow: 0 40px 80px rgba(9, 54, 48, .26);
  z-index: 2;
}
.phone::before {
  content: "";
  position: absolute;
  top: 16px;
  left: 50%;
  width: 84px;
  height: 22px;
  transform: translateX(-50%);
  border-radius: 999px;
  background: #0a332d;
  z-index: 3;
}
.phone img { width: 100%; border-radius: 33px; aspect-ratio: 9/16; object-fit: cover; object-position: center top; }
.phone-back {
  position: absolute;
  width: 238px;
  right: -5px;
  bottom: 38px;
  transform: rotate(8deg);
  opacity: .95;
  z-index: 1;
}
.phone-front { transform: rotate(-4deg); }
.float-card {
  position: absolute;
  left: 0;
  bottom: 75px;
  width: 235px;
  padding: 20px 22px;
  border: 1px solid rgba(255,255,255,.65);
  border-radius: 22px;
  background: rgba(255,255,255,.84);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  z-index: 4;
}
.float-card strong { display: block; font-size: 21px; }
.float-card span { color: var(--ink-soft); font-size: 13px; }
.float-card .pulse { height: 38px; margin-top: 12px; }
.pulse svg { width: 100%; height: 100%; }

.value-strip { padding: 32px 0 18px; }
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.value-item { padding: 34px 28px; border-right: 1px solid var(--line); }
.value-item:last-child { border-right: 0; }
.value-item b { display: block; color: var(--brand); font-family: "Noto Serif CJK SC", serif; font-size: 30px; }
.value-item span { display: block; margin-top: 8px; color: var(--ink-soft); }

.product-feature {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, #0b4f42, #0a3f39 66%, #143f4b);
  color: white;
  box-shadow: var(--shadow);
}
.product-feature::after {
  content: "";
  position: absolute;
  inset: -20% -10% auto 48%;
  height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(213,193,143,.2), transparent 64%);
}
.product-feature-inner { position: relative; z-index: 2; display: grid; grid-template-columns: .88fr 1.12fr; gap: 70px; align-items: center; padding: 72px; }
.product-feature-copy .eyebrow { color: #eadcb5; }
.product-feature-copy h2 { margin: 0; font-family: "Noto Serif CJK SC", serif; font-size: clamp(42px, 5vw, 68px); line-height: 1.1; }
.product-feature-copy p { color: rgba(255,255,255,.72); font-size: 17px; }
.feature-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 28px 0; }
.feature-tags span { padding: 8px 13px; border: 1px solid rgba(255,255,255,.16); border-radius: 999px; color: rgba(255,255,255,.84); font-size: 13px; }
.product-feature-copy .button-secondary { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.22); color: white; }
.product-visual { position: relative; min-height: 500px; }
.product-visual .phone { position: absolute; right: 8%; top: 0; width: 270px; }
.product-visual .phone.back { right: 42%; top: 52px; width: 230px; transform: rotate(-7deg); opacity: .85; }
.metric-chip {
  position: absolute;
  right: 0;
  bottom: 12px;
  min-width: 220px;
  padding: 18px 20px;
  border-radius: 18px;
  color: var(--ink);
  background: rgba(255,255,255,.93);
  box-shadow: 0 24px 60px rgba(0,0,0,.2);
}
.metric-chip small { color: var(--ink-soft); }
.metric-chip strong { display: block; font-size: 28px; color: var(--brand); }

.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
.about-card {
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255,255,255,.62);
}
.about-card h3 { margin: 0 0 16px; font-size: 22px; }
.about-card p { margin: 0; color: var(--ink-soft); }
.about-list { margin-top: 22px; display: grid; gap: 13px; }
.about-list div { display: flex; gap: 12px; color: var(--ink-soft); }
.about-list b { color: var(--brand); }

.site-footer { padding: 34px 0 42px; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 13px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.footer-links { display: flex; align-items: center; gap: 20px; }
.footer-records { display: inline-flex; align-items: center; gap: 8px; }
.footer-security-mark { width: 18px; height: 18px; flex: 0 0 auto; object-fit: contain; }
.footer-links a:hover, .footer-records a:hover { color: var(--brand); }

/* Product detail */
.product-hero { padding: 88px 0 76px; }
.product-hero-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 68px; align-items: center; }
.product-brand { display: flex; align-items: center; gap: 18px; margin-bottom: 30px; }
.product-brand img { width: 78px; border-radius: 22px; box-shadow: 0 14px 32px rgba(12,90,74,.18); }
.product-brand b { font-size: 20px; }
.product-brand span { display: block; color: var(--ink-soft); font-size: 13px; margin-top: 3px; }
.product-hero h1 { margin: 0; font-family: "Noto Serif CJK SC", serif; font-size: clamp(48px, 6vw, 78px); line-height: 1.08; }
.product-hero h1 em { display: block; color: var(--brand); font-style: normal; }
.product-hero p { max-width: 650px; margin: 26px 0 0; color: var(--ink-soft); font-size: 19px; }
.product-hero-art {
  min-height: 610px;
  display: grid;
  place-items: center;
  position: relative;
}
.poster-window {
  position: absolute;
  width: 74%;
  right: 0;
  top: 0;
  height: 580px;
  border-radius: 38px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.poster-window img { width: 100%; height: 100%; object-fit: cover; object-position: center 25%; }
.product-hero-art .phone { position: absolute; left: 0; bottom: -15px; width: 260px; transform: rotate(-6deg); }

.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 50px; }
.feature-card { min-height: 214px; padding: 28px; border-radius: var(--radius-md); background: rgba(255,255,255,.7); border: 1px solid var(--line); }
.feature-number { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 50%; background: var(--brand-soft); color: var(--brand); font-weight: 800; }
.feature-card h3 { margin: 28px 0 8px; font-size: 21px; }
.feature-card p { margin: 0; color: var(--ink-soft); font-size: 15px; }

.app-showcase { background: #eaf3ef; }
.app-showcase-grid { display: grid; grid-template-columns: .82fr 1.18fr; gap: 68px; align-items: center; }
.app-tabs { display: grid; gap: 12px; margin-top: 32px; }
.app-tab {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
  border: 1px solid transparent;
  border-radius: 18px;
  background: transparent;
  color: var(--ink-soft);
  text-align: left;
  cursor: pointer;
}
.app-tab b { display: block; color: var(--ink); }
.app-tab span { font-size: 13px; }
.app-tab-index { display: grid; place-items: center; flex: 0 0 auto; width: 36px; height: 36px; border-radius: 50%; background: rgba(12,90,74,.08); color: var(--brand); font-weight: 800; }
.app-tab.is-active { border-color: rgba(12,90,74,.15); background: rgba(255,255,255,.72); box-shadow: 0 12px 30px rgba(12,90,74,.08); }
.app-stage { position: relative; min-height: 640px; display: grid; place-items: center; overflow: hidden; }
.app-stage::before { content: ""; position: absolute; width: 490px; height: 490px; border-radius: 50%; background: radial-gradient(circle, rgba(205,183,127,.35), rgba(255,255,255,0) 68%); }
.app-stage .phone { width: 294px; }
.app-stage .screen { display: none; }
.app-stage .screen.is-active { display: block; }

.usage-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 64px; align-items: center; }
.usage-visual { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); max-height: 680px; }
.usage-visual img { width: 100%; height: 100%; object-fit: cover; object-position: center 40%; }
.usage-points { display: grid; gap: 22px; margin-top: 34px; }
.usage-point { padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.usage-point b { display: block; margin-bottom: 5px; font-size: 18px; }
.usage-point span { color: var(--ink-soft); }

.legal-card {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 34px;
  padding: 44px 48px;
  border-radius: var(--radius-lg);
  color: white;
  background: var(--brand-deep);
}
.legal-card h2 { margin: 0 0 10px; font-family: "Noto Serif CJK SC", serif; font-size: 34px; }
.legal-card p { margin: 0; color: rgba(255,255,255,.68); }
.legal-product { display: flex; align-items: center; gap: 20px; }
.legal-product img { width: 68px; height: 68px; flex: 0 0 auto; border-radius: 18px; box-shadow: 0 12px 28px rgba(0,0,0,.2); }
.legal-kicker { display: block; margin-bottom: 7px; color: #eadcb5; font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.legal-actions { display: flex; gap: 12px; }
.legal-actions .button { border-color: rgba(255,255,255,.2); color: white; background: rgba(255,255,255,.08); }

@media (max-width: 980px) {
  :root { --container: min(100% - 36px, 760px); }
  .site-nav { display: none; position: absolute; left: 18px; right: 18px; top: 70px; padding: 18px; flex-direction: column; align-items: stretch; gap: 6px; border: 1px solid var(--line); border-radius: 20px; background: rgba(247,244,238,.98); box-shadow: var(--shadow); }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 12px 14px; }
  .menu-toggle { display: inline-flex; }
  .hero-grid, .product-hero-grid, .product-feature-inner, .about-grid, .app-showcase-grid, .usage-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 58px; }
  .hero-art { min-height: 590px; }
  .hero-copy { text-align: center; }
  .hero-copy p { margin-left: auto; margin-right: auto; }
  .hero-actions, .hero-note { justify-content: center; }
  .product-feature-inner { padding: 56px 40px; }
  .product-visual { min-height: 520px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .product-hero-art { margin-top: 20px; }
  .app-showcase-grid { gap: 20px; }
  .app-stage { min-height: 570px; }
}

@media (max-width: 640px) {
  :root { --container: calc(100% - 28px); --radius-lg: 25px; }
  .section { padding: 76px 0; }
  .section-tight { padding: 58px 0; }
  .header-inner { min-height: 68px; }
  .brand-lockup { min-width: 132px; }
  .brand-text strong { font-size: 16px; }
  .brand-text span { font-size: 9px; }
  .display { font-size: 48px; }
  .hero { padding-top: 42px; }
  .hero-copy p, .product-hero p { font-size: 17px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .button { width: 100%; }
  .hero-note { gap: 12px; flex-wrap: wrap; font-size: 12px; }
  .hero-art { min-height: 470px; }
  .hero-orbit { width: 360px; height: 360px; }
  .hero-orbit::before { inset: 42px; }
  .hero-orbit::after { inset: 84px; }
  .phone { width: 218px; border-radius: 34px; }
  .phone img { border-radius: 27px; }
  .phone-back { width: 178px; right: 2px; }
  .product-emblem { width: 98px; right: 2px; border-radius: 23px; }
  .product-emblem img { border-radius: 17px; }
  .float-card { width: 190px; left: -3px; bottom: 36px; padding: 15px; }
  .float-card strong { font-size: 17px; }
  .value-grid { grid-template-columns: 1fr; }
  .value-item { border-right: 0; border-bottom: 1px solid var(--line); padding: 25px 10px; }
  .value-item:last-child { border-bottom: 0; }
  .product-feature-inner { padding: 42px 22px; gap: 32px; }
  .product-feature-copy h2 { font-size: 46px; }
  .product-visual { min-height: 440px; }
  .product-visual .phone { width: 220px; right: 2%; }
  .product-visual .phone.back { width: 180px; right: 43%; top: 42px; }
  .metric-chip { min-width: 185px; padding: 14px; }
  .metric-chip strong { font-size: 24px; }
  .about-grid { gap: 24px; }
  .about-card { padding: 25px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-links { flex-wrap: wrap; }
  .footer-records { gap: 7px; }
  .product-hero { padding: 55px 0 40px; }
  .product-brand img { width: 62px; }
  .product-hero h1 { font-size: 49px; }
  .product-hero-art { min-height: 500px; }
  .poster-window { width: 84%; height: 470px; border-radius: 28px; }
  .product-hero-art .phone { width: 200px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: auto; }
  .app-stage { min-height: 500px; }
  .app-stage .phone { width: 235px; }
  .usage-grid { gap: 34px; }
  .usage-visual { max-height: 560px; }
  .legal-card { grid-template-columns: 1fr; padding: 34px 24px; }
  .legal-product { align-items: flex-start; gap: 15px; }
  .legal-product img { width: 54px; height: 54px; border-radius: 15px; }
  .legal-card h2 { font-size: 28px; }
  .legal-actions { flex-direction: column; }
  .legal-actions .button { width: 100%; }
}


/* Support entry and page */
.support-strip { padding: 38px 0 72px; }
.support-strip-inner {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 52px;
  align-items: center;
  padding: 38px 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,.7);
  box-shadow: 0 18px 44px rgba(18,55,58,.07);
}
.support-strip h2 { margin: 0; font-family: "Noto Serif CJK SC", "Songti SC", serif; font-size: 36px; }
.support-strip p { margin: 10px 0 0; color: var(--ink-soft); }
.support-strip-contact { display: grid; grid-template-columns: 1fr auto; gap: 8px 20px; align-items: center; }
.support-email { color: var(--brand); font-size: 21px; font-weight: 800; }
.support-strip-contact > span { grid-column: 1; color: var(--ink-soft); font-size: 14px; }
.support-strip-contact .button { grid-column: 2; grid-row: 1 / span 2; }

.support-hero { padding: 106px 0 88px; overflow: hidden; }
.support-hero-grid { display: grid; grid-template-columns: 1fr .82fr; gap: 80px; align-items: center; }
.support-hero h1 { margin: 0; font-family: "Noto Serif CJK SC", "Songti SC", serif; font-size: clamp(56px, 8vw, 96px); line-height: 1.04; letter-spacing: -.04em; }
.support-hero p { max-width: 590px; margin: 26px 0 0; color: var(--ink-soft); font-size: 19px; }
.support-mail-card { padding: 38px; border-radius: var(--radius-lg); color: white; background: linear-gradient(145deg,var(--brand-deep),#0e6252); box-shadow: var(--shadow); }
.support-mail-card > span { color: #eadcb5; font-size: 13px; letter-spacing: .08em; }
.support-mail-card > a:not(.button) { display: block; margin: 10px 0 12px; font-size: clamp(23px,3vw,32px); font-weight: 800; word-break: break-word; }
.support-mail-card p { margin: 0 0 26px; color: rgba(255,255,255,.68); font-size: 14px; }
.support-mail-card .button { background: white; color: var(--brand-deep); box-shadow: none; }
.support-details { background: #eaf3ef; }
.support-heading { margin-bottom: 34px; }
.contact-list { margin: 0; border-top: 1px solid rgba(21,52,72,.13); }
.contact-list > div { display: grid; grid-template-columns: 240px 1fr; gap: 28px; padding: 25px 0; border-bottom: 1px solid rgba(21,52,72,.13); }
.contact-list dt { color: var(--ink-soft); font-size: 14px; }
.contact-list dd { margin: 0; font-size: 19px; font-weight: 650; }
.contact-list a { color: var(--brand); }
.support-note-section { padding-top: 52px; }
.support-note { display: flex; align-items: center; justify-content: space-between; gap: 34px; padding: 34px 38px; border: 1px solid var(--line); border-radius: var(--radius-md); background: rgba(255,255,255,.64); }
.support-note span { color: var(--brand); font-size: 13px; font-weight: 800; letter-spacing: .08em; }
.support-note h2 { margin: 4px 0; font-size: 28px; }
.support-note p { margin: 0; color: var(--ink-soft); }

@media (max-width: 980px) {
  .support-strip-inner, .support-hero-grid { grid-template-columns: 1fr; }
  .support-hero { padding-top: 72px; }
  .support-hero-grid { gap: 38px; }
}
@media (max-width: 640px) {
  .support-strip { padding: 18px 0 58px; }
  .support-strip-inner { padding: 28px 22px; gap: 26px; }
  .support-strip h2 { font-size: 30px; }
  .support-strip-contact { grid-template-columns: 1fr; }
  .support-strip-contact > span, .support-strip-contact .button { grid-column: 1; grid-row: auto; }
  .support-strip-contact .button { margin-top: 14px; width: 100%; }
  .support-hero { padding: 58px 0 56px; }
  .support-hero h1 { font-size: 58px; }
  .support-mail-card { padding: 28px 22px; }
  .contact-list > div { grid-template-columns: 1fr; gap: 7px; padding: 20px 0; }
  .contact-list dd { font-size: 17px; }
  .support-note { flex-direction: column; align-items: flex-start; padding: 28px 22px; }
  .support-note .button { width: 100%; }
}