:root {
  --graphite: #1f232a;
  --ink: #111827;
  --blue: #0052ff;
  --blue-2: #1f6fff;
  --cyan: #00b7ff;
  --muted: #667085;
  --line: #dce3ec;
  --surface: #f5f7fb;
  --surface-2: #eef4ff;
  --white: #ffffff;
  --warning: #f59e0b;
  --danger: #ef4444;
  --success: #12b76a;
  --radius-sm: 12px;
  --radius: 22px;
  --radius-lg: 34px;
  --shadow: 0 22px 60px rgba(20, 43, 83, .12);
  --container: min(1180px, calc(100vw - 40px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }

.container { width: var(--container); margin-inline: auto; }
.section { padding: 96px 0; }
.section.compact { padding: 68px 0; }
.section.alt { background: var(--surface); }
.section.dark {
  color: white;
  background:
    radial-gradient(circle at 15% 10%, rgba(0, 183, 255, .22), transparent 30%),
    radial-gradient(circle at 90% 80%, rgba(0, 82, 255, .22), transparent 35%),
    #071426;
}
.section-header { max-width: 760px; margin-bottom: 44px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--blue); font-size: 14px; font-weight: 750; letter-spacing: .08em;
  text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 28px; height: 3px; border-radius: 999px; background: linear-gradient(90deg, var(--blue), var(--cyan)); }
.section-title { margin: 12px 0 18px; font-size: clamp(32px, 4.3vw, 56px); line-height: 1.15; letter-spacing: -.035em; }
.section-subtitle { margin: 0; color: var(--muted); font-size: clamp(16px, 2vw, 20px); }
.dark .section-subtitle { color: #b9c5d6; }

.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255,255,255,.88); backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(220,227,236,.75);
}
.header-inner { width: var(--container); margin: auto; min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; min-width: 235px; }
.brand img { width: 46px; height: 46px; }
.brand-name { font-weight: 820; line-height: 1.15; letter-spacing: -.02em; }
.brand-en { display: block; margin-top: 3px; color: var(--muted); font-size: 9px; letter-spacing: .08em; font-weight: 650; }
.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a { padding: 10px 12px; color: #344054; font-size: 14px; font-weight: 650; border-radius: 10px; }
.main-nav a:hover, .main-nav a.is-active { color: var(--blue); background: var(--surface-2); }
.header-actions { display: flex; gap: 10px; align-items: center; }
.menu-button { display: none; width: 42px; height: 42px; border: 0; border-radius: 10px; background: var(--surface); cursor: pointer; }
.menu-button span { display: block; width: 20px; height: 2px; background: var(--ink); margin: 4px auto; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 48px; padding: 0 20px; border-radius: 12px; border: 1px solid transparent; font-weight: 750; transition: .22s ease; cursor: pointer; }
.btn:hover { transform: translateY(-2px); }
.btn.primary { color: white; background: linear-gradient(135deg, var(--blue), var(--blue-2)); box-shadow: 0 12px 30px rgba(0,82,255,.24); }
.btn.secondary { color: var(--ink); background: white; border-color: var(--line); }
.btn.ghost { color: var(--blue); background: var(--surface-2); }
.btn.small { min-height: 40px; padding-inline: 15px; font-size: 14px; }

.hero { overflow: hidden; padding: 76px 0 90px; background:
  linear-gradient(180deg, rgba(238,244,255,.8), rgba(255,255,255,0) 50%),
  linear-gradient(120deg, #fff 0%, #fff 55%, #f3f7ff 100%); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(360px, .92fr); align-items: center; gap: 58px; }
.hero h1 { margin: 18px 0 22px; max-width: 750px; font-size: clamp(36px, 4.6vw, 64px); text-wrap: balance; line-height: 1.12; letter-spacing: -.055em; }
.gradient-text { color: transparent; background: linear-gradient(115deg, var(--blue), var(--cyan)); background-clip: text; -webkit-background-clip: text; }
.hero-copy { max-width: 680px; color: #475467; font-size: clamp(17px, 2vw, 21px); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.tag { display: inline-flex; gap: 8px; align-items: center; padding: 8px 12px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.78); color: #475467; font-size: 13px; font-weight: 650; }
.tag i { width: 7px; height: 7px; border-radius: 50%; background: var(--success); box-shadow: 0 0 0 5px rgba(18,183,106,.1); }

.product-stage { min-height: 540px; position: relative; display: grid; place-items: center; isolation: isolate; }
.product-stage::before { content: ""; position: absolute; width: 430px; height: 430px; border-radius: 50%; background: radial-gradient(circle, rgba(0,183,255,.15), rgba(0,82,255,.04) 52%, transparent 70%); z-index: -2; }
.radar { position: absolute; width: 410px; height: 410px; border: 1px solid rgba(0,82,255,.18); border-radius: 50%; animation: pulse 4s infinite; }
.radar.r2 { width: 310px; height: 310px; animation-delay: 1.2s; }
.radar.r3 { width: 220px; height: 220px; animation-delay: 2.4s; }
.device-visual { position: relative; width: 300px; height: 420px; filter: drop-shadow(0 28px 25px rgba(14,34,67,.24)); }
.device-body { position: absolute; left: 92px; bottom: 40px; width: 160px; height: 265px; border-radius: 82px 82px 30px 30px; background: linear-gradient(90deg, #9fa6ad 0%, #f8fafc 20%, #c9cfd5 48%, #fafafa 72%, #9ea5ac 100%); border: 1px solid #a6adb5; }
.device-body::before { content: ""; position: absolute; left: 0; right: 0; top: -2px; height: 54px; border-radius: 50%; background: radial-gradient(ellipse at 50% 35%, #f9fafb 0 16%, #c8ced4 45%, #8b9299 90%); border: 1px solid #a6adb5; }
.device-body::after { content: ""; position: absolute; left: 7px; right: 7px; bottom: 24px; height: 3px; background: rgba(45,55,72,.22); }
.antenna { position: absolute; left: 51px; bottom: 115px; width: 26px; height: 265px; border-radius: 15px; background: linear-gradient(90deg, #090b0e, #30343a 46%, #090b0e); }
.antenna::after { content: ""; position: absolute; left: 17px; bottom: -4px; width: 72px; height: 28px; border-radius: 15px; background: #11151a; transform: rotate(12deg); transform-origin: left center; }
.device-badge { position: absolute; right: 0; top: 42px; max-width: 180px; padding: 14px 16px; border-radius: 14px; background: rgba(255,255,255,.94); border: 1px solid rgba(220,227,236,.9); box-shadow: var(--shadow); font-size: 13px; color: #475467; }
.device-badge strong { display: block; color: var(--ink); font-size: 15px; margin-bottom: 3px; }
@keyframes pulse { 0%,100% { transform: scale(.96); opacity: .35; } 50% { transform: scale(1.04); opacity: .9; } }

.stat-strip { display: grid; grid-template-columns: repeat(4,1fr); margin-top: 32px; position: relative; z-index: 4; border-radius: var(--radius); background: white; box-shadow: var(--shadow); border: 1px solid var(--line); overflow: hidden; }
.stat { padding: 28px 30px; }
.stat + .stat { border-left: 1px solid var(--line); }
.stat strong { display: block; color: var(--blue); font-size: 30px; letter-spacing: -.04em; }
.stat span { color: var(--muted); font-size: 14px; }

.grid-2 { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 20px; }
.card { padding: 30px; border: 1px solid var(--line); border-radius: var(--radius); background: white; box-shadow: 0 14px 40px rgba(20,43,83,.06); }
.card h3 { margin: 16px 0 8px; font-size: 22px; line-height: 1.3; }
.card p { margin: 0; color: var(--muted); }
.icon-box { width: 52px; height: 52px; display: grid; place-items: center; border-radius: 15px; color: var(--blue); background: var(--surface-2); }
.icon-box svg { width: 28px; height: 28px; }
.card.emphasis { background: linear-gradient(145deg, #071426, #102b52); color: white; border-color: rgba(255,255,255,.12); }
.card.emphasis p { color: #bdc8d8; }
.card.emphasis .icon-box { color: #75d8ff; background: rgba(0,183,255,.12); }

.storyline { position: relative; display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; }
.storyline::before { content: ""; position: absolute; left: 7%; right: 7%; top: 44px; height: 2px; background: linear-gradient(90deg, var(--cyan), var(--blue)); opacity: .4; }
.story-step { position: relative; text-align: center; z-index: 1; }
.story-dot { width: 88px; height: 88px; margin: 0 auto 16px; display: grid; place-items: center; border-radius: 50%; background: white; border: 1px solid var(--line); box-shadow: 0 10px 25px rgba(0,82,255,.08); color: var(--blue); font-size: 24px; font-weight: 850; }
.story-step h4 { margin: 0 0 6px; }
.story-step p { margin: 0; color: var(--muted); font-size: 14px; }

.split { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 54px; align-items: center; }
.feature-list { display: grid; gap: 16px; margin-top: 26px; }
.feature-item { display: flex; gap: 14px; align-items: flex-start; }
.feature-item .check { flex: 0 0 auto; width: 25px; height: 25px; border-radius: 50%; display: grid; place-items: center; color: white; background: linear-gradient(135deg,var(--blue),var(--cyan)); font-size: 13px; margin-top: 2px; }
.feature-item strong { display: block; margin-bottom: 3px; }
.feature-item span { color: var(--muted); font-size: 15px; }

.signal-panel { position: relative; min-height: 460px; padding: 32px; border-radius: var(--radius-lg); color: white; background: #071426; overflow: hidden; }
.signal-panel::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px); background-size: 40px 40px; }
.wave { position: absolute; left: 6%; right: 6%; bottom: 105px; height: 150px; }
.wave svg { width: 100%; height: 100%; }
.frequency-bands { position: absolute; left: 7%; right: 7%; bottom: 32px; display: grid; grid-template-columns: 1fr 1.15fr 1.3fr; gap: 8px; }
.band { padding: 12px; border-radius: 10px; text-align: center; font-size: 13px; border: 1px solid rgba(255,255,255,.12); }
.band.low { background: rgba(18,183,106,.12); }
.band.mid { background: rgba(245,158,11,.12); }
.band.high { background: rgba(239,68,68,.12); }

.dual-sensor { display: grid; grid-template-columns: 1fr auto 1fr; gap: 26px; align-items: stretch; }
.sensor-card { padding: 32px; border-radius: var(--radius); border: 1px solid var(--line); background: white; }
.sensor-card.sentinel { box-shadow: inset 0 4px 0 var(--cyan); }
.sensor-card.doctor { box-shadow: inset 0 4px 0 var(--blue); }
.sensor-card h3 { margin: 8px 0; font-size: 26px; }
.sensor-label { display: inline-block; padding: 4px 10px; border-radius: 999px; font-size: 12px; font-weight: 750; background: var(--surface-2); color: var(--blue); }
.sensor-connector { display: grid; place-items: center; color: var(--blue); font-size: 42px; }

.matrix { width: 100%; border-collapse: collapse; overflow: hidden; border-radius: var(--radius); border: 1px solid var(--line); background: white; }
.matrix th, .matrix td { padding: 16px; border-bottom: 1px solid var(--line); text-align: left; }
.matrix th { background: var(--surface); font-size: 14px; }
.matrix tr:last-child td { border-bottom: 0; }
.yes { color: var(--success); font-weight: 800; }
.no { color: #98a2b3; }

.phone-row { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.phone { border-radius: 36px; padding: 16px; background: #101828; box-shadow: var(--shadow); }
.phone-screen { min-height: 515px; border-radius: 26px; padding: 24px 18px; background: #f6f7f9; }
.phone-bar { display: flex; justify-content: space-between; font-size: 11px; margin-bottom: 22px; color: #344054; }
.notification { padding: 16px; margin-bottom: 12px; border-radius: 16px; background: white; border: 1px solid #e4e7ec; }
.notification strong { display: flex; justify-content: space-between; gap: 10px; }
.notification p { margin: 6px 0 0; color: var(--muted); font-size: 13px; }
.level { font-size: 11px; padding: 3px 8px; border-radius: 999px; }
.level.focus { color: #027a48; background: #ecfdf3; }
.level.warn { color: #b54708; background: #fffaeb; }
.level.alarm { color: #b42318; background: #fef3f2; }
.mini-chart { margin-top: 18px; padding: 16px; border-radius: 16px; background: white; }
.mini-chart svg { width: 100%; height: 130px; }

.proof-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 28px; }
.photo-card { border-radius: var(--radius); overflow: hidden; background: #101828; }
.photo-card img { width: 100%; height: 430px; object-fit: cover; object-position: center 65%; opacity: .88; }
.photo-caption { padding: 18px 20px; color: white; }
.proof-panel { padding: 28px; border-radius: var(--radius); background: #071426; color: white; }
.proof-panel img { border-radius: 14px; border: 1px solid rgba(255,255,255,.1); }
.proof-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 18px 0; }
.proof-stat { padding: 16px; border-radius: 14px; background: rgba(255,255,255,.06); }
.proof-stat strong { display: block; color: #66d4ff; font-size: 24px; }
.proof-stat span { color: #bdc8d8; font-size: 13px; }
.disclaimer { margin-top: 16px; color: #98a2b3; font-size: 12px; }

.application-card { min-height: 260px; position: relative; padding: 30px; overflow: hidden; border-radius: var(--radius); color: white; background: #0b1c34; }
.application-card::before { content: ""; position: absolute; width: 230px; height: 230px; right: -60px; bottom: -80px; border-radius: 50%; background: linear-gradient(135deg, rgba(0,82,255,.9), rgba(0,183,255,.3)); }
.application-card h3, .application-card p, .application-card ul { position: relative; z-index: 2; }
.application-card p { color: #bec8d7; }
.application-card ul { margin: 18px 0 0; padding-left: 18px; color: #e8edf4; }

.page-hero { padding: 82px 0 64px; background: linear-gradient(135deg, #f5f8ff, #fff 55%, #eefaff); }
.page-hero h1 { margin: 14px 0 18px; max-width: 860px; font-size: clamp(42px, 5.5vw, 68px); line-height: 1.1; letter-spacing: -.045em; }
.page-hero p { max-width: 760px; color: var(--muted); font-size: 19px; }
.breadcrumb { color: var(--muted); font-size: 14px; }
.breadcrumb a { color: var(--blue); }

.cta { padding: 68px 0; background: linear-gradient(115deg, #071426, #102d58); color: white; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.cta h2 { margin: 0 0 8px; font-size: clamp(30px,4vw,48px); }
.cta p { margin: 0; color: #bdc8d8; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 12px; flex: 0 0 auto; }

.contact-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 30px; }
.contact-card { padding: 34px; border-radius: var(--radius); background: white; border: 1px solid var(--line); }
.contact-list { display: grid; gap: 18px; margin: 26px 0; }
.contact-row { display: flex; gap: 14px; align-items: flex-start; }
.contact-row strong { display: block; }
.contact-row span, .contact-row a { color: var(--muted); }
.qr-panel { display: grid; place-items: center; text-align: center; padding: 34px; border-radius: var(--radius); background: var(--surface); }
.qr-panel img { width: min(320px, 80vw); border-radius: 12px; }
.qr-panel h3 { margin: 20px 0 6px; }
.qr-panel p { margin: 0; color: var(--muted); }

.site-footer { padding: 58px 0 26px; color: #c4cfdf; background: #071426; }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3,1fr); gap: 36px; }
.footer-brand { max-width: 370px; }
.footer-brand .brand-name { color: white; }
.footer-brand p { color: #98a8bb; }
.footer-title { color: white; font-weight: 760; margin-bottom: 14px; }
.footer-links { display: grid; gap: 9px; }
.footer-links a { color: #98a8bb; font-size: 14px; }
.footer-links a:hover { color: white; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; margin-top: 40px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.1); color: #8190a5; font-size: 13px; }

[data-reveal] { opacity: 1; transform: none; }
[data-reveal].is-visible { opacity: 1; transform: none; }

@media (max-width: 1080px) {
  .main-nav { position: fixed; inset: 79px 18px auto; display: none; padding: 16px; flex-direction: column; align-items: stretch; background: white; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
  .main-nav.is-open { display: flex; }
  .main-nav a { padding: 13px 14px; }
  .menu-button { display: block; }
  .header-actions .btn.secondary { display: none; }
  .hero-grid, .split, .proof-grid, .contact-grid { grid-template-columns: 1fr; }
  .product-stage { min-height: 450px; }
  .storyline { grid-template-columns: repeat(3,1fr); row-gap: 34px; }
  .storyline::before { display: none; }
  .grid-4 { grid-template-columns: repeat(2,1fr); }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
  .footer-grid > :last-child { grid-column: 2 / -1; }
}

@media (max-width: 720px) {
  :root { --container: min(100% - 28px, 1180px); }
  .section { padding: 72px 0; }
  .header-inner { min-height: 70px; }
  .brand { min-width: 0; }
  .brand img { width: 40px; height: 40px; }
  .brand-en { display: none; }
  .header-actions .btn.primary { display: none; }
  .main-nav { inset: 70px 12px auto; }
  .hero { padding-top: 54px; }
  .hero-grid { gap: 26px; }
  .hero h1 { font-size: 40px; }
  .product-stage { min-height: 390px; transform: scale(.86); margin: -26px 0; }
  .stat-strip { grid-template-columns: repeat(2,1fr); margin-top: 0; }
  .stat:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
  .stat:nth-child(4) { border-top: 1px solid var(--line); }
  .grid-2, .grid-3, .grid-4, .phone-row { grid-template-columns: 1fr; }
  .storyline { grid-template-columns: repeat(2,1fr); }
  .dual-sensor { grid-template-columns: 1fr; }
  .sensor-connector { transform: rotate(90deg); }
  .frequency-bands { grid-template-columns: 1fr; position: static; margin-top: 250px; }
  .signal-panel { min-height: 580px; }
  .proof-stats { grid-template-columns: 1fr; }
  .cta-inner, .footer-bottom { align-items: flex-start; flex-direction: column; }
  .cta-actions { width: 100%; }
  .cta-actions .btn { flex: 1; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > :first-child { grid-column: 1 / -1; }
  .footer-grid > :last-child { grid-column: auto; }
  .matrix { display: block; overflow-x: auto; }
}

/* Keep long technical terms readable without changing the existing visual system. */
.prose { max-width: 860px; }
.prose p, .prose li { font-size: 18px; line-height: 1.85; overflow-wrap: anywhere; }
.prose h2 { margin-top: 2em; font-size: clamp(26px, 3vw, 36px); line-height: 1.3; }
.prose a, .related-links a { color: var(--blue); text-decoration: underline; text-underline-offset: .2em; }
.prose .article-note { color: var(--muted); font-size: 15px; }
.application-card a { position: relative; z-index: 2; }
.main-nav { max-height: calc(100dvh - 90px); overflow-y: auto; }
:target { scroll-margin-top: 96px; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--cyan); outline-offset: 4px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}