:root {
  --ink: #13263a;
  --muted: #63758a;
  --blue: #1375d1;
  --cyan: #25c8ff;
  --navy: #061425;
  --line: #dce7f2;
  --surface: #f4f8fc;
  --white: #fff;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: #e9eff5;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}
main { width: min(100%, 920px); margin: 0 auto; background: var(--white); box-shadow: 0 0 40px rgba(3, 18, 35, .12); overflow: hidden; }
img { max-width: 100%; }

.hero { position: relative; aspect-ratio: 16 / 9; min-height: 420px; background: var(--navy); overflow: hidden; }
.hero-image { width: 100%; height: 100%; object-fit: cover; display: block; }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(2, 12, 25, .86) 0%, rgba(3, 18, 36, .5) 40%, rgba(3, 18, 36, .04) 69%), linear-gradient(0deg, rgba(3, 15, 30, .45), transparent 40%); }
.hero-copy { position: absolute; z-index: 2; left: clamp(24px, 6.5vw, 70px); top: 50%; width: min(48%, 410px); transform: translateY(-50%); color: white; }
.eyebrow { margin: 0 0 13px; color: #77d8ff; font-size: 11px; line-height: 1.4; font-weight: 700; letter-spacing: .19em; }
.hero h1 { margin: 0; font-size: clamp(38px, 6vw, 68px); line-height: 1.06; letter-spacing: -.04em; font-weight: 800; text-shadow: 0 8px 30px rgba(0, 0, 0, .2); }
.hero-subtitle { margin: 20px 0 0; font-size: clamp(17px, 2.6vw, 23px); font-weight: 500; letter-spacing: .05em; }
.hero-line { width: 54px; height: 3px; margin: 20px 0 14px; background: linear-gradient(90deg, var(--cyan), transparent); box-shadow: 0 0 15px var(--cyan); }
.hero-note { margin: 0; color: #b9d1e7; font-size: 13px; line-height: 1.6; }
.scroll-cue { position: absolute; z-index: 2; left: 50%; bottom: 18px; width: 20px; height: 32px; border: 1px solid rgba(255,255,255,.35); border-radius: 14px; transform: translateX(-50%); }
.scroll-cue span { position: absolute; left: 8px; top: 7px; width: 3px; height: 6px; border-radius: 2px; background: var(--cyan); animation: scrollCue 1.7s ease-in-out infinite; }

.metric-ribbon { display: grid; grid-template-columns: repeat(4, 1fr); background: #07192d; color: white; border-top: 1px solid rgba(66, 197, 255, .25); }
.metric { min-width: 0; padding: 21px 12px 18px; text-align: center; border-right: 1px solid rgba(255,255,255,.1); }
.metric:last-child { border-right: 0; }
.metric strong { display: block; color: #67d5ff; font-size: clamp(17px, 2.5vw, 23px); line-height: 1.25; font-weight: 750; white-space: nowrap; }
.metric span { display: block; margin-top: 5px; color: #9eb3c7; font-size: 12px; }

.article-shell { padding: 0 clamp(22px, 7vw, 72px) 70px; }
.opening { padding: 62px 0 26px; }
p { margin: 13px 0; }
.lead { margin-top: 0; color: #18344e; font-size: 19px; line-height: 1.9; font-weight: 550; }
blockquote { position: relative; margin: 30px 0; padding: 25px 28px 25px 32px; background: linear-gradient(135deg, #edf7ff, #f8fbfe); border: 1px solid #d8e9f7; border-radius: 4px 16px 16px 4px; color: #0a5798; font-size: 18px; line-height: 1.75; font-weight: 650; }
blockquote::before { content: "“"; position: absolute; left: 10px; top: 1px; color: rgba(19, 117, 209, .2); font-family: Georgia, serif; font-size: 52px; line-height: 1; }

.section { padding: 52px 0 22px; border-top: 1px solid var(--line); }
.section-index { margin-bottom: 10px; color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: .19em; }
h2 { margin: 0 0 21px; color: #0b2944; font-size: clamp(26px, 4.4vw, 36px); line-height: 1.35; letter-spacing: -.025em; }
h3 { color: #123451; }
.statement { margin: 24px 0 0; padding-left: 18px; border-left: 3px solid var(--cyan); color: #164b75; font-weight: 650; }

.contrast { display: grid; grid-template-columns: 1fr 34px 1fr; align-items: stretch; gap: 12px; margin: 28px 0; }
.contrast-side { padding: 22px; border-radius: 16px; }
.contrast-side.old { background: #f3f5f7; border: 1px solid #e3e8ed; }
.contrast-side.new { background: linear-gradient(145deg, #eaf6ff, #f7fbff); border: 1px solid #cde7f8; box-shadow: 0 12px 30px rgba(25, 119, 190, .08); }
.contrast-label { display: inline-block; margin-bottom: 9px; color: #53677a; font-size: 14px; font-weight: 750; }
.new .contrast-label { color: #0872bf; }
.contrast ul { margin: 0; padding: 0; list-style: none; }
.contrast li { position: relative; margin: 9px 0; padding-left: 17px; color: #4b5e70; font-size: 14px; line-height: 1.65; }
.contrast li::before { content: ""; position: absolute; left: 0; top: .75em; width: 6px; height: 6px; border-radius: 50%; background: #aab5bf; }
.new li::before { background: var(--blue); box-shadow: 0 0 7px rgba(19,117,209,.4); }
.contrast-arrow { display: grid; place-items: center; color: var(--blue); font-size: 23px; font-weight: 700; }

.wide-figure { margin: 28px 0 34px; }
.wide-figure img { width: 100%; display: block; border: 1px solid var(--line); border-radius: 18px; background: #f5f7f8; }
figcaption { margin-top: 9px; color: #8190a0; font-size: 12px; line-height: 1.55; text-align: center; }
.system-list { margin-top: 18px; border-top: 1px solid var(--line); }
.system-item { display: grid; grid-template-columns: 54px 1fr; gap: 12px; padding: 23px 0; border-bottom: 1px solid var(--line); }
.system-item > span { color: #2bbdf1; font-size: 13px; font-weight: 800; letter-spacing: .08em; }
.system-item h3 { margin: -2px 0 5px; font-size: 18px; }
.system-item p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.75; }

.dark-panel { position: relative; margin: 50px calc(clamp(22px, 7vw, 72px) * -1) 0; padding: 62px clamp(22px, 7vw, 72px) 54px; overflow: hidden; background: radial-gradient(circle at 90% 0%, rgba(15,151,220,.22), transparent 34%), linear-gradient(145deg, #07182b, #0b2742); border: 0; color: #cbd9e7; }
.dark-panel::before { content: ""; position: absolute; inset: 0; opacity: .16; background-image: linear-gradient(rgba(73,190,240,.25) 1px, transparent 1px), linear-gradient(90deg, rgba(73,190,240,.25) 1px, transparent 1px); background-size: 34px 34px; mask-image: linear-gradient(to bottom, transparent, #000 40%, transparent); }
.dark-panel > * { position: relative; z-index: 1; }
.dark-panel .section-index { color: #45cffd; }
.dark-panel h2, .dark-panel h3 { color: white; }
.dark-panel > p { color: #b3c6d7; }
.tech-stack { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin-top: 30px; background: rgba(111, 201, 240, .16); border: 1px solid rgba(111, 201, 240, .16); }
.tech-stack article { position: relative; min-height: 190px; padding: 26px; background: rgba(5, 23, 41, .72); overflow: hidden; }
.tech-stack article:last-child { grid-column: 1 / -1; min-height: 160px; }
.tech-stack b { position: absolute; right: 18px; top: 8px; color: rgba(75, 207, 253, .14); font-size: 54px; line-height: 1; }
.tech-stack h3 { margin: 0 0 10px; font-size: 18px; }
.tech-stack p { margin: 0; color: #aebfd0; font-size: 14px; line-height: 1.75; }

.workflow { position: relative; margin: 34px 0; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); list-style: none; }
.workflow::before { content: ""; position: absolute; left: 10%; right: 10%; top: 21px; height: 2px; background: linear-gradient(90deg, #b8dcef, #20bbed); }
.workflow li { position: relative; padding: 0 8px; text-align: center; }
.workflow li > span { position: relative; z-index: 1; display: grid; place-items: center; width: 43px; height: 43px; margin: 0 auto 13px; border: 2px solid #1aa9de; border-radius: 50%; background: white; color: var(--blue); font-size: 12px; font-weight: 800; box-shadow: 0 0 0 7px white; }
.workflow strong { display: block; color: #123451; font-size: 14px; }
.workflow small { display: block; margin-top: 5px; color: #76889a; font-size: 11px; line-height: 1.55; }
.data-showcase { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 34px 0; }
.data-showcase figure { margin: 0; }
.scan-frame { position: relative; overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: #f8fbfe; }
.scan-frame img { width: 100%; display: block; aspect-ratio: 1.45; object-fit: contain; }
.scan-frame i { position: absolute; top: 0; bottom: 0; width: 2px; background: rgba(34, 197, 255, .85); box-shadow: 0 0 16px 5px rgba(34, 197, 255, .25); animation: scan 3.6s ease-in-out infinite; }

.route-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 13px; margin: 28px 0; }
.route-card { padding: 18px 16px 19px; border: 1px solid var(--line); border-radius: 15px; background: linear-gradient(180deg, #fff, #f7fafc); }
.route-card svg { width: 100%; height: auto; overflow: visible; }
.route-card svg path, .route-card svg > circle:not(.target) { fill: none; stroke: #148bd2; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; vector-effect: non-scaling-stroke; stroke-dasharray: 1; stroke-dashoffset: 1; }
.route-card.in-view svg path, .route-card.in-view svg > circle:not(.target) { animation: drawRoute 1.5s ease-out forwards; }
.route-card svg circle { fill: white; stroke: #148bd2; stroke-width: 3; vector-effect: non-scaling-stroke; }
.route-card svg .target { fill: #ff7a1a; stroke: none; }
.route-card h3 { margin: 3px 0 5px; font-size: 16px; }
.route-card p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.6; }
.route-planning-figure { margin-top: 30px; }
.route-planning-figure img { box-shadow: 0 14px 32px rgba(13, 57, 91, .13); }
.route-planning-figure figcaption { max-width: 620px; margin-left: auto; margin-right: auto; }

.spec-section { padding-bottom: 46px; }
.spec-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 27px; }
.spec-grid > div { min-height: 160px; padding: 24px 17px; border: 1px solid #d8e6f2; border-radius: 15px; background: linear-gradient(145deg, #f8fbfe, #eef6fc); }
.spec-grid strong { display: block; color: #0875c5; font-size: 22px; line-height: 1.25; white-space: nowrap; }
.spec-grid span { display: block; margin-top: 10px; color: #183a58; font-size: 14px; font-weight: 750; }
.spec-grid small { display: block; margin-top: 7px; color: #728497; font-size: 11px; line-height: 1.55; }
.spec-grid .metric-value { display: inline-flex; align-items: baseline; gap: 4px; white-space: nowrap; }
.spec-grid .metric-note { display: inline; flex: none; margin: 0; color: #728497; font-size: .5em; font-weight: 400; white-space: nowrap; }
.fine-print { margin-top: 14px; color: #8a98a7; font-size: 11px; }

.tethered-section { padding-bottom: 47px; }
.tethered-figure { position: relative; margin: 29px 0 25px; overflow: hidden; border-radius: 18px; background: #07182b; box-shadow: 0 18px 44px rgba(5, 34, 59, .18); }
.tethered-figure::after { content: ""; position: absolute; inset: 0; pointer-events: none; border: 1px solid rgba(80, 203, 255, .2); border-radius: inherit; }
.tethered-figure img { width: 100%; display: block; aspect-ratio: 16 / 9; object-fit: cover; }
.tethered-figure figcaption { position: absolute; inset: auto 0 0; margin: 0; padding: 42px 18px 13px; color: #d8e9f6; text-align: left; background: linear-gradient(transparent, rgba(3, 16, 29, .84)); }
.tethered-capabilities { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 25px 0; }
.tethered-capabilities article { position: relative; min-height: 178px; padding: 23px 18px 20px; overflow: hidden; border: 1px solid #d5e6f3; border-radius: 15px; background: linear-gradient(145deg, #f8fbfe, #eef7fd); }
.tethered-capabilities span { position: absolute; right: 15px; top: 8px; color: rgba(24, 151, 211, .13); font-size: 42px; line-height: 1; font-weight: 800; }
.tethered-capabilities h3 { position: relative; margin: 0 0 9px; padding-top: 18px; color: #0c619b; font-size: 16px; }
.tethered-capabilities p { position: relative; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.mode-complement { display: grid; grid-template-columns: 1fr 46px 1fr; align-items: center; margin-top: 29px; padding: 22px; border-radius: 16px; background: #071a2e; color: white; }
.mode-complement > div { text-align: center; }
.mode-complement strong { display: block; color: #66d5ff; font-size: 16px; }
.mode-complement span { display: block; margin-top: 5px; color: #9eb6ca; font-size: 12px; line-height: 1.55; }
.mode-complement i { color: #32c4f6; font-size: 25px; font-style: normal; text-align: center; }
.tethered-note { margin: 17px 0 0; color: #527087; font-size: 14px; }

.application-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 30px; margin: 23px 0 36px; }
.application-list article { position: relative; padding: 24px 0 23px 42px; border-bottom: 1px solid var(--line); }
.application-list span { position: absolute; left: 0; top: 24px; color: #20afe3; font-size: 12px; font-weight: 800; }
.application-list h3 { margin: 0 0 7px; font-size: 17px; }
.application-list p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
.field-gallery { display: grid; grid-template-columns: 1.4fr 1fr 1fr; grid-template-rows: 180px 180px; gap: 10px; }
.field-gallery figure { position: relative; margin: 0; overflow: hidden; border-radius: 13px; background: #d9e3eb; }
.field-gallery .gallery-large { grid-row: 1 / span 2; }
.field-gallery figure:last-child { grid-column: 2 / span 2; }
.field-gallery img { width: 100%; height: 100%; display: block; object-fit: cover; transition: transform .7s ease; }
.field-gallery figure:hover img { transform: scale(1.035); }
.field-gallery figcaption { position: absolute; inset: auto 0 0; margin: 0; padding: 25px 12px 10px; color: white; text-align: left; background: linear-gradient(transparent, rgba(3, 16, 28, .82)); }

.delivery { padding-bottom: 18px; }
.delivery-line { display: flex; align-items: center; justify-content: space-between; margin: 31px 0; padding: 23px 20px; border: 1px solid #cfe4f3; border-radius: 15px; background: #f2f9fe; }
.delivery-line span { color: #0e568c; font-size: 13px; font-weight: 750; white-space: nowrap; }
.delivery-line i { flex: 1; min-width: 8px; height: 1px; margin: 0 9px; background: linear-gradient(90deg, #a8d9f0, #25bdea); }
.closing { margin-top: 32px; color: #103b5d; font-size: 19px; line-height: 1.9; font-weight: 600; }

.page-footer { padding: 34px 22px calc(34px + env(safe-area-inset-bottom)); background: #061628; color: white; text-align: center; }
.page-footer strong { display: block; font-size: 16px; letter-spacing: .08em; }
.page-footer span { display: block; margin-top: 5px; color: #7897b1; font-size: 11px; letter-spacing: .1em; }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in-view { opacity: 1; transform: none; }

@keyframes scrollCue { 0% { opacity: 0; transform: translateY(0); } 35% { opacity: 1; } 100% { opacity: 0; transform: translateY(11px); } }
@keyframes scan { 0%, 100% { left: 4%; opacity: 0; } 15%, 85% { opacity: 1; } 50% { left: 96%; } }
@keyframes drawRoute { to { stroke-dashoffset: 0; } }

@media (max-width: 700px) {
  body { background: white; font-size: 16px; }
  main { width: 100%; box-shadow: none; }
  .hero { min-height: 510px; aspect-ratio: auto; }
  .hero-image { object-position: 61% center; }
  .hero-shade { background: linear-gradient(90deg, rgba(2,12,25,.91) 0%, rgba(2,12,25,.64) 48%, rgba(2,12,25,.12) 87%), linear-gradient(0deg, rgba(2,12,25,.48), transparent 50%); }
  .hero-copy { left: 24px; top: 47%; width: 66%; }
  .hero h1 { font-size: clamp(38px, 11vw, 54px); }
  .eyebrow { font-size: 9px; letter-spacing: .13em; }
  .hero-subtitle { font-size: 17px; line-height: 1.55; }
  .hero-note { font-size: 12px; }
  .metric-ribbon { grid-template-columns: 1fr 1fr; }
  .metric:nth-child(2) { border-right: 0; }
  .metric:nth-child(-n+2) { border-bottom: 1px solid rgba(255,255,255,.1); }
  .metric { padding: 17px 8px 15px; }
  .metric strong { font-size: 18px; }
  .article-shell { padding: 0 21px 54px; }
  .opening { padding-top: 45px; }
  .lead { font-size: 18px; }
  blockquote { margin: 25px 0; padding: 22px 20px 22px 27px; font-size: 17px; }
  .section { padding-top: 45px; }
  .contrast { grid-template-columns: 1fr; }
  .contrast-arrow { height: 18px; transform: rotate(90deg); }
  .dark-panel { margin-left: -21px; margin-right: -21px; padding: 50px 21px 46px; }
  .tech-stack { grid-template-columns: 1fr; }
  .tech-stack article, .tech-stack article:last-child { grid-column: auto; min-height: 0; }
  .workflow { grid-template-columns: 1fr; gap: 0; }
  .workflow::before { left: 21px; right: auto; top: 20px; bottom: 20px; width: 2px; height: auto; }
  .workflow li { display: grid; grid-template-columns: 44px 1fr; grid-template-rows: auto auto; column-gap: 16px; min-height: 94px; padding: 0; text-align: left; }
  .workflow li > span { grid-row: 1 / span 2; margin: 0; }
  .workflow strong { align-self: end; font-size: 15px; }
  .workflow small { align-self: start; font-size: 12px; }
  .data-showcase { grid-template-columns: 1fr; }
  .route-grid, .spec-grid { grid-template-columns: 1fr 1fr; }
  .tethered-capabilities { grid-template-columns: 1fr; }
  .tethered-capabilities article { min-height: 0; }
  .application-list { grid-template-columns: 1fr; }
  .field-gallery { grid-template-columns: 1fr 1fr; grid-template-rows: 220px 145px 165px; }
  .field-gallery .gallery-large { grid-column: 1 / span 2; grid-row: auto; }
  .field-gallery figure:last-child { grid-column: 1 / span 2; }
  .delivery-line { display: grid; grid-template-columns: 1fr; gap: 7px; text-align: center; }
  .delivery-line i { width: 1px; height: 13px; margin: 0 auto; }
  .closing { font-size: 18px; }
}

@media (max-width: 420px) {
  .route-grid, .spec-grid { grid-template-columns: 1fr; }
  .spec-grid > div { min-height: 0; }
  .system-item { grid-template-columns: 40px 1fr; }
  .mode-complement { grid-template-columns: 1fr; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}