:root {
  --ink: #1a2a3a;
  --muted: #5a7a94;
  --line: rgba(0, 160, 210, 0.15);
  --water: #0094cc;
  --water-dark: #007ab8;
  --cyan: #0fa4b8;
  --leaf: #00b880;
  --sun: #e08830;
  --paper: #ffffff;
  --white: #ffffff;
  --card: rgba(240, 246, 252, 0.95);
  --card-border: rgba(0, 148, 204, 0.2);
  --glow: 0 0 30px rgba(0, 148, 204, 0.08);
  --shadow: 0 24px 70px rgba(0, 40, 80, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  background: var(--paper);
  background-image:
    radial-gradient(circle at 50% 0%, rgba(0, 148, 204, 0.04) 0%, transparent 50%),
    radial-gradient(circle at 0% 100%, rgba(0, 180, 130, 0.03) 0%, transparent 40%);
}

a {
  color: inherit;
  text-decoration: none;
}

/* ── section separator glow lines ── */
.section + .section,
.section + .contact {
  border-top: 1px solid rgba(0, 148, 204, 0.06);
}

.section + .section::after,
.section + .contact::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 148, 204, 0.25), transparent);
  pointer-events: none;
  z-index: 5;
}

/* node dots at separator intersections */
.section + .section::after {
  box-shadow: 0 0 20px rgba(0, 148, 204, 0.15);
}

/* ── grid / tech background pattern ── */
.section {
  position: relative;
}

.section-intro::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 148, 204, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 148, 204, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

/* products section: finer grid, different origin */
#products::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 148, 204, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 148, 204, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at 30% 60%, black 0%, transparent 60%);
  -webkit-mask-image: radial-gradient(ellipse at 30% 60%, black 0%, transparent 60%);
}

/* cases section: diagonal grid feel */
#cases::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 148, 204, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 148, 204, 0.02) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at 70% 40%, black 0%, transparent 55%);
  -webkit-mask-image: radial-gradient(ellipse at 70% 40%, black 0%, transparent 55%);
}

/* service section: sparse grid */
.section-service::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 148, 204, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 148, 204, 0.02) 1px, transparent 1px);
  background-size: 100px 100px;
  mask-image: radial-gradient(ellipse at 50% 80%, black 0%, transparent 60%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 80%, black 0%, transparent 60%);
}

/* ── animated glow pulse ── */
@keyframes glowPulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

@keyframes scanline {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(100vh); }
}

@keyframes nodeFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* ── header ── */
.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(20px, 5vw, 72px);
  color: var(--white);
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s;
}

.site-header.is-scrolled,
.site-header.is-open {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: rgba(0, 148, 204, 0.08);
  box-shadow: 0 2px 20px rgba(0, 40, 80, 0.08);
  backdrop-filter: blur(20px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 170px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  color: var(--white);
  background: linear-gradient(135deg, #0094cc, #03a9dc);
  font-weight: 800;
  box-shadow: 0 0 20px rgba(0, 148, 204, 0.25), 0 0 60px rgba(0, 148, 204, 0.1);
  animation: glowPulse 3s ease-in-out infinite;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  margin-top: 1px;
  color: var(--muted);
  font-size: 12px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 32px);
  font-size: 15px;
  font-weight: 600;
}

.site-nav a {
  opacity: 0.72;
  transition: opacity 0.2s, color 0.2s, text-shadow 0.2s;
}

.site-nav a:hover {
  opacity: 1;
  color: var(--water);
  text-shadow: none;
}

.site-nav a.is-active {
  opacity: 1;
  color: var(--water);
}

.page-sub .site-header {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: rgba(0, 148, 204, 0.08);
  box-shadow: 0 2px 20px rgba(0, 40, 80, 0.08);
  backdrop-filter: blur(20px);
}

.page-sub main {
  padding-top: 82px;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(0, 200, 255, 0.3);
  border-radius: 8px;
  color: inherit;
  background: transparent;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
}

/* ── hero ── */
.hero {
  position: relative;
  display: grid;
  align-items: end;
  min-height: 94vh;
  padding: 132px clamp(20px, 5vw, 72px) 68px;
  overflow: hidden;
  color: var(--white);
}

.hero-media,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-media {
  background-image: url("assets/aquaculture-hero.jpg");
  background-size: cover;
  background-position: center;
  transform: scale(1.02);
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(0, 30, 60, 0.7) 0%, rgba(0, 30, 60, 0.45) 46%, rgba(0, 30, 60, 0.15) 100%),
    linear-gradient(0deg, rgba(0, 30, 60, 0.5) 0%, rgba(0, 40, 80, 0) 48%);
}

/* hero bottom glow edge */
.hero-shade::after {
  display: none;
}

/* hero grid overlay */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 148, 204, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 148, 204, 0.04) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.3) 60%, transparent 100%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.3) 60%, transparent 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--water);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-shadow: none;
}

.hero .eyebrow {
  color: var(--water);
  text-shadow: none;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: clamp(56px, 9vw, 112px);
  line-height: 0.96;
  letter-spacing: 0;
  text-shadow: 0 0 40px rgba(0, 148, 204, 0.1);
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(30px, 3.2vw, 44px);
  line-height: 1.12;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 21px;
  line-height: 1.28;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 700px;
  color: rgba(255, 255, 255, 0.9);
  font-size: clamp(18px, 2vw, 24px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 32px 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 800;
  cursor: pointer;
  transition: box-shadow 0.3s, transform 0.2s, background 0.3s;
}

.btn-primary {
  color: #060e1c;
  background: linear-gradient(135deg, var(--water), #03a9dc);
  box-shadow:
    0 0 20px rgba(0, 148, 204, 0.25),
    0 0 60px rgba(0, 148, 204, 0.1),
    inset 0 1px 0 rgba(255,255,255,0.2);
}

.btn-primary:hover {
  box-shadow:
    0 0 30px rgba(0, 148, 204, 0.35),
    0 0 80px rgba(0, 148, 204, 0.15);
  transform: translateY(-2px);
}

.btn-secondary {
  color: var(--water);
  border-color: rgba(0, 148, 204, 0.25);
  background: rgba(0, 148, 204, 0.04);
  box-shadow: 0 0 20px rgba(0, 148, 204, 0.04);
}

.btn-secondary:hover {
  background: rgba(0, 148, 204, 0.08);
  border-color: rgba(0, 148, 204, 0.4);
  box-shadow: 0 0 30px rgba(0, 148, 204, 0.1);
}

.hero-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-metrics span {
  position: relative;
  min-width: 138px;
  padding: 14px 16px;
  border: 1px solid rgba(0, 148, 204, 0.15);
  border-radius: 8px;
  background: rgba(0, 148, 204, 0.04);
  backdrop-filter: blur(12px);
  overflow: hidden;
}

/* HUD corner accents on metric cards */
.hero-metrics span::before,
.hero-metrics span::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border-color: var(--water);
  border-style: solid;
  opacity: 0.5;
}

.hero-metrics span::before {
  top: 4px;
  left: 4px;
  border-width: 2px 0 0 2px;
}

.hero-metrics span::after {
  bottom: 4px;
  right: 4px;
  border-width: 0 2px 2px 0;
}

.hero-metrics strong {
  display: block;
  font-size: 24px;
  line-height: 1;
  color: var(--water);
  text-shadow: 0 0 12px rgba(0, 148, 204, 0.25);
}

.mobile-hero-card {
  display: none;
}

/* ── sections ── */
.section {
  padding: 88px clamp(20px, 5vw, 72px);
}

section[id] {
  scroll-margin-top: 82px;
}

.section-heading {
  max-width: 820px;
  margin-bottom: 36px;
}

.section-heading h2 {
  max-width: 780px;
}

.section-heading p:not(.eyebrow) {
  color: var(--muted);
}

.home-overview {
  background:
    radial-gradient(circle at 18% 18%, rgba(0, 148, 204, 0.07), transparent 30%),
    radial-gradient(circle at 85% 70%, rgba(0, 180, 130, 0.05), transparent 28%),
    linear-gradient(180deg, #f4f9fe 0%, #edf6fc 100%);
}

.home-overview-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 18px;
}

.home-overview-grid a {
  display: grid;
  min-height: 210px;
  padding: 24px;
  border: 1px solid rgba(0, 148, 204, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 0 30px rgba(0, 148, 204, 0.04), 0 18px 44px rgba(0, 40, 80, 0.06);
  transition: transform 0.2s ease, box-shadow 0.3s ease, border-color 0.2s ease;
}

.home-overview-grid a:hover {
  border-color: rgba(0, 148, 204, 0.32);
  box-shadow: 0 0 42px rgba(0, 148, 204, 0.12), 0 22px 58px rgba(0, 40, 80, 0.1);
  transform: translateY(-3px);
}

.home-overview-grid span {
  color: var(--water);
  font-size: 30px;
  font-weight: 900;
  line-height: 1;
}

.home-overview-grid strong {
  align-self: end;
  margin-top: 42px;
  color: var(--ink);
  font-size: 22px;
  line-height: 1.25;
}

.home-overview-grid small {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

/* ── app download page ── */
.page-download main {
  padding-top: 0;
}

.download-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  min-height: 92vh;
  padding: 138px clamp(20px, 5vw, 72px) 72px;
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(0, 30, 60, 0.76) 0%, rgba(0, 30, 60, 0.54) 52%, rgba(0, 30, 60, 0.18) 100%),
    url("assets/aquaculture-hero.jpg") center / cover no-repeat;
  overflow: hidden;
}

.download-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 148, 204, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 148, 204, 0.04) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.28) 58%, transparent 100%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.28) 58%, transparent 100%);
}

.download-copy,
.download-panel {
  position: relative;
  z-index: 1;
}

.download-copy h1 {
  max-width: 720px;
  font-size: clamp(48px, 7.2vw, 92px);
}

.download-lead {
  max-width: 720px;
  color: rgba(255, 255, 255, 0.9);
  font-size: clamp(18px, 1.8vw, 23px);
}

.download-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.download-stats span {
  position: relative;
  min-width: 150px;
  padding: 14px 16px;
  border: 1px solid rgba(0, 148, 204, 0.18);
  border-radius: 8px;
  background: rgba(0, 148, 204, 0.08);
  backdrop-filter: blur(12px);
  overflow: hidden;
}

.download-stats strong {
  display: block;
  color: var(--water);
  font-size: 24px;
  line-height: 1.1;
}

.download-panel {
  justify-self: end;
  width: min(420px, 100%);
  padding: clamp(26px, 4vw, 42px);
  border: 1px solid rgba(0, 148, 204, 0.22);
  border-radius: 8px;
  background: rgba(4, 22, 38, 0.66);
  box-shadow: 0 0 42px rgba(0, 148, 204, 0.16), 0 28px 80px rgba(0, 20, 38, 0.32);
  backdrop-filter: blur(18px);
}

.download-app-icon {
  display: grid;
  place-items: center;
  width: 72px;
  height: 72px;
  margin-bottom: 22px;
  border-radius: 14px;
  color: var(--white);
  background: linear-gradient(135deg, #0094cc, #03a9dc);
  box-shadow: 0 0 28px rgba(0, 148, 204, 0.32);
  font-size: 32px;
  font-weight: 900;
}

.download-panel h2 {
  margin-bottom: 6px;
  color: var(--white);
}

.download-panel p {
  color: rgba(255, 255, 255, 0.74);
}

.download-specs {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
}

.download-specs div {
  display: grid;
  grid-template-columns: 86px minmax(0, 1fr);
  gap: 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.download-specs dt {
  color: rgba(255, 255, 255, 0.58);
}

.download-specs dd {
  margin: 0;
  overflow-wrap: anywhere;
  font-weight: 800;
}

.download-detail {
  background:
    radial-gradient(circle at 15% 18%, rgba(0, 148, 204, 0.07), transparent 28%),
    radial-gradient(circle at 88% 76%, rgba(0, 180, 130, 0.05), transparent 30%),
    linear-gradient(180deg, #f4f9fe 0%, #edf6fc 100%);
}

.download-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: 18px;
}

.install-steps,
.download-checksum {
  padding: clamp(24px, 3vw, 34px);
  border: 1px solid rgba(0, 148, 204, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 0 30px rgba(0, 148, 204, 0.04), 0 18px 44px rgba(0, 40, 80, 0.06);
}

.install-steps ol {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.9;
}

.download-checksum p {
  color: var(--muted);
}

.download-checksum code {
  display: block;
  padding: 16px;
  border: 1px solid rgba(0, 148, 204, 0.16);
  border-radius: 8px;
  color: var(--water-dark);
  background: rgba(0, 148, 204, 0.06);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
  overflow-wrap: anywhere;
}

.download-note {
  margin-top: 18px;
  padding: 16px 18px;
  border-left: 4px solid var(--sun);
  border-radius: 0 8px 8px 0;
  color: #72410e;
  background: rgba(224, 136, 48, 0.12);
}

.copy-toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 30;
  transform: translateX(-50%) translateY(12px);
  opacity: 0;
  pointer-events: none;
  padding: 11px 16px;
  border-radius: 8px;
  color: var(--white);
  background: var(--ink);
  transition: 0.18s ease;
}

.copy-toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.company-cover {
  background:
    radial-gradient(circle at 82% 18%, rgba(0, 148, 204, 0.08), transparent 30%),
    linear-gradient(180deg, #edf6fc 0%, #f5faff 100%);
}

.company-cover-link {
  position: relative;
  display: grid;
  align-items: center;
  min-height: 560px;
  padding: clamp(34px, 6vw, 72px);
  color: var(--white);
  border: 1px solid rgba(0, 148, 204, 0.16);
  border-radius: 8px;
  background:
    linear-gradient(90deg, rgba(0, 31, 58, 0.72) 0%, rgba(0, 45, 75, 0.46) 50%, rgba(0, 45, 75, 0.1) 100%),
    url("assets/delivery-iot-visual.jpg?v=company-cover-20260531-1") center / cover no-repeat;
  box-shadow: 0 0 40px rgba(0, 148, 204, 0.08), var(--shadow);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.3s ease;
}

.company-cover-link:hover {
  box-shadow: 0 0 48px rgba(0, 148, 204, 0.16), 0 28px 80px rgba(0, 40, 80, 0.14);
  transform: translateY(-2px);
}

.company-cover-copy {
  position: relative;
  z-index: 1;
  max-width: 780px;
  text-shadow: 0 3px 18px rgba(0, 20, 38, 0.32);
}

.company-cover h2 {
  margin-bottom: 10px;
  color: var(--white);
  font-size: clamp(48px, 7vw, 92px);
}

.company-cover-subtitle,
.company-cover-lead {
  max-width: 680px;
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(18px, 2vw, 24px);
}

.company-cover-slogan {
  display: grid;
  gap: 6px;
  margin: 34px 0 26px;
  color: var(--white);
  font-size: clamp(30px, 4.5vw, 58px);
  font-weight: 900;
  line-height: 1.12;
}

.company-cover-action {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 22px;
  padding: 0 18px;
  color: #061220;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--water), #03a9dc);
  font-weight: 900;
  text-shadow: none;
}

.company-about {
  background:
    radial-gradient(circle at 12% 20%, rgba(0, 180, 130, 0.05), transparent 28%),
    radial-gradient(circle at 88% 80%, rgba(0, 148, 204, 0.06), transparent 30%),
    linear-gradient(180deg, #f5faff 0%, #edf6fc 100%);
}

.company-about-content {
  max-width: 960px;
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid rgba(0, 148, 204, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 0 40px rgba(0, 148, 204, 0.05), var(--shadow);
}

.company-about-content p {
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.9;
}

.company-about-content p:last-child {
  margin-bottom: 0;
}

.detail-hero {
  background:
    radial-gradient(circle at 15% 18%, rgba(0, 148, 204, 0.08), transparent 30%),
    radial-gradient(circle at 84% 70%, rgba(3, 169, 220, 0.06), transparent 30%),
    linear-gradient(180deg, #f3f9fe 0%, #eaf5fc 100%);
}

.detail-back {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  margin-bottom: 22px;
  padding: 0 14px;
  color: var(--water);
  border: 1px solid rgba(0, 148, 204, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  font-weight: 900;
}

.detail-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(360px, 0.62fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: center;
}

.detail-copy h1 {
  margin-bottom: 18px;
  color: var(--ink);
  font-size: clamp(40px, 5.8vw, 76px);
  line-height: 1.04;
  text-shadow: none;
}

.detail-copy p:not(.eyebrow) {
  max-width: 760px;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 24px);
}

.detail-photo {
  margin: 0;
  border: 1px solid rgba(0, 148, 204, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 0 40px rgba(0, 148, 204, 0.08), var(--shadow);
  overflow: hidden;
}

.detail-photo img {
  display: block;
  width: 100%;
  height: clamp(300px, 30vw, 460px);
  object-fit: cover;
}

.detail-body {
  background:
    radial-gradient(circle at 82% 12%, rgba(0, 148, 204, 0.05), transparent 28%),
    linear-gradient(180deg, #eaf5fc 0%, #f6fbff 100%);
}

.detail-content {
  display: grid;
  grid-template-columns: minmax(0, 0.74fr) minmax(300px, 0.42fr);
  gap: 22px;
  align-items: start;
}

.detail-panel {
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid rgba(0, 148, 204, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 0 40px rgba(0, 148, 204, 0.05), var(--shadow);
}

.detail-panel h2 {
  margin-bottom: 18px;
}

.detail-panel p,
.detail-panel li {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.9;
}

.detail-panel ul {
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding-left: 1.2em;
}

.detail-flow {
  display: grid;
  gap: 14px;
}

.detail-flow article {
  padding: 24px;
  border: 1px solid rgba(0, 148, 204, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 0 28px rgba(0, 148, 204, 0.04);
}

.detail-flow span {
  display: block;
  margin-bottom: 14px;
  color: var(--water);
  font-size: 28px;
  font-weight: 900;
}

.detail-flow strong {
  display: block;
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 20px;
}

.detail-flow p {
  margin: 0;
  color: var(--muted);
}

/* ── products section: mid-depth panel ── */
#products {
  background:
    radial-gradient(circle at 15% 30%, rgba(0, 148, 204, 0.04), transparent 30%),
    radial-gradient(circle at 90% 70%, rgba(0, 180, 130, 0.03), transparent 25%),
    linear-gradient(180deg, #f0f6fc 0%, #e8f1fa 50%, #f0f6fc 100%);
}

/* ── cases section: elevated panel ── */
#cases {
  background:
    radial-gradient(circle at 60% 20%, rgba(0, 148, 204, 0.05), transparent 30%),
    radial-gradient(circle at 10% 90%, rgba(200, 140, 50, 0.03), transparent 25%),
    linear-gradient(180deg, #eaf2fb 0%, #e4eef8 50%, #eaf2fb 100%);
  box-shadow: inset 0 1px 0 rgba(0, 148, 204, 0.06);
}

/* ── intro section: raised panel, brightest ── */
.section-intro {
  background:
    radial-gradient(circle at 82% 18%, rgba(0, 148, 204, 0.06), transparent 28%),
    radial-gradient(circle at 20% 80%, rgba(0, 180, 130, 0.04), transparent 30%),
    linear-gradient(180deg, #f0f6fc 0%, #e8f1fa 100%);
  box-shadow: inset 0 1px 0 rgba(0, 148, 204, 0.08);
}

.intro-feature {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(320px, 0.48fr);
  gap: clamp(24px, 5vw, 64px);
  align-items: center;
  min-height: 520px;
  padding: clamp(32px, 5vw, 58px);
  border: 1px solid rgba(0, 148, 204, 0.15);
  border-radius: 8px;
  color: var(--white);
  background: url("assets/delivery-iot-visual.jpg?v=delivery-background-20260531-1") center / cover no-repeat;
  box-shadow: 0 0 40px rgba(0, 148, 204, 0.06), var(--shadow);
  overflow: hidden;
  margin-bottom: 34px;
}

.intro-feature .section-heading {
  position: relative;
  z-index: 1;
  margin-bottom: 0;
  text-shadow: 0 3px 18px rgba(0, 20, 38, 0.36);
}

.intro-feature .eyebrow {
  color: var(--water);
  text-shadow: none;
}

.intro-feature .section-heading p:not(.eyebrow) {
  max-width: 640px;
  color: rgba(255, 255, 255, 0.86);
}

.crab-photo-card {
  display: none;
}

.crab-photo-card::after {
  content: none;
}

.crab-photo-card img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 420px;
  object-fit: cover;
  object-position: center;
}

.crab-photo-card figcaption {
  position: absolute;
  z-index: 1;
  left: 24px;
  right: 24px;
  bottom: 24px;
  color: var(--white);
}

.crab-photo-card figcaption span,
.crab-photo-card figcaption strong {
  display: block;
}

.crab-photo-card figcaption span {
  margin-bottom: 8px;
  color: var(--water);
  font-size: 13px;
  font-weight: 800;
  text-shadow: none;
}

.crab-photo-card figcaption strong {
  max-width: 460px;
  font-size: 24px;
  line-height: 1.25;
}

.photo-notes {
  position: absolute;
  z-index: 1;
  top: 18px;
  left: 18px;
  right: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.photo-notes span {
  padding: 7px 11px;
  border: 1px solid rgba(0, 148, 204, 0.2);
  border-radius: 999px;
  color: var(--water);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  font-size: 13px;
  font-weight: 700;
  box-shadow: 0 0 12px rgba(0, 148, 204, 0.08);
}

/* ── grids ── */
.intro-grid,
.product-grid,
.case-grid,
.service-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.intro-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.case-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

/* ── card base: HUD panel style ── */
.intro-grid article,
.product-card,
.case-card {
  position: relative;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  background: var(--card);
  box-shadow: var(--glow);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
  overflow: hidden;
}

/* HUD corner brackets on cards */
.intro-grid article::before,
.product-card::before,
.case-card::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 6px;
  width: 18px;
  height: 18px;
  border-top: 2px solid rgba(0, 148, 204, 0.2);
  border-left: 2px solid rgba(0, 148, 204, 0.2);
  z-index: 3;
  pointer-events: none;
  transition: border-color 0.3s;
}

.intro-grid article:hover,
.product-card:hover,
.case-card:hover {
  border-color: rgba(0, 148, 204, 0.2);
  box-shadow: 0 0 50px rgba(0, 148, 204, 0.1), 0 0 100px rgba(0, 148, 204, 0.05);
  transform: translateY(-3px);
}

.intro-grid article:hover::before,
.product-card:hover::before,
.case-card:hover::before {
  border-color: rgba(0, 148, 204, 0.4);
}

.card-hit-area {
  position: absolute;
  inset: 0;
  z-index: 8;
  border-radius: inherit;
  cursor: pointer;
}

.card-hit-area::after {
  content: "查看详情";
  position: absolute;
  right: 14px;
  bottom: 14px;
  padding: 6px 10px;
  color: var(--water);
  border: 1px solid rgba(0, 148, 204, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 0 16px rgba(0, 148, 204, 0.08);
  font-size: 12px;
  font-weight: 900;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.intro-grid article:hover .card-hit-area::after,
.product-card:hover .card-hit-area::after,
.case-card:hover .card-hit-area::after,
.intro-feature:hover .card-hit-area::after,
.solution-summary:hover .card-hit-area::after,
.workflow article:hover .card-hit-area::after,
.solution-architecture article:hover .card-hit-area::after,
.solution-packages article:hover .card-hit-area::after {
  opacity: 1;
  transform: translateY(0);
  border-color: rgba(0, 148, 204, 0.32);
}

.workflow .card-hit-area::after {
  color: #061220;
  background: rgba(255, 255, 255, 0.9);
}

.intro-grid article {
  padding: 0;
}

.intro-card-photo {
  position: relative;
  height: 160px;
  margin: 0;
  overflow: hidden;
  border-bottom: 1px solid var(--card-border);
}

.intro-card-photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(0, 40, 80, 0) 30%, rgba(0, 40, 80, 0.15) 100%);
}

.intro-card-photo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.95) contrast(1.04);
  transform: scale(1.02);
}

.intro-grid article .icon,
.intro-grid article h3,
.intro-grid article .card-signal,
.intro-grid article p {
  margin-left: 24px;
  margin-right: 24px;
}

.intro-grid article .icon {
  margin-top: 20px;
}

.intro-grid article p {
  padding-bottom: 24px;
}

.intro-grid article::after {
  position: absolute;
  right: -34px;
  bottom: -44px;
  width: 118px;
  height: 118px;
  border-radius: 50%;
  background: rgba(0, 148, 204, 0.05);
  content: "";
}

/* ── icon ── */
.icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 18px;
  border-radius: 8px;
  color: var(--water);
  background: rgba(0, 148, 204, 0.06);
  border: 1px solid rgba(0, 148, 204, 0.15);
  font-weight: 900;
  box-shadow: 0 0 16px rgba(0, 148, 204, 0.08);
  animation: glowPulse 4s ease-in-out infinite;
}

/* ── product cards ── */
.product-card h3,
.product-card p,
.product-card ul {
  padding-left: 22px;
  padding-right: 22px;
}

.product-card h3 {
  margin-top: 22px;
}

.product-card p,
.intro-grid p,
.case-card p,
.contact-copy p {
  color: var(--muted);
}

/* ── signal cards ── */
.card-signal {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin: 22px 0 16px;
  padding: 12px 14px;
  border-radius: 8px;
  color: var(--water);
  background: rgba(0, 148, 204, 0.04);
  border: 1px solid rgba(0, 148, 204, 0.1);
  box-shadow: inset 0 0 20px rgba(0, 148, 204, 0.04);
}

.card-signal strong,
.card-signal span {
  position: relative;
  z-index: 1;
}

.card-signal strong {
  font-size: 20px;
  text-shadow: 0 0 8px rgba(0, 148, 204, 0.2);
}

.card-signal span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.card-signal.warm {
  color: var(--sun);
  background: rgba(240, 160, 64, 0.06);
  border-color: rgba(240, 160, 64, 0.2);
  box-shadow: inset 0 0 20px rgba(200, 140, 50, 0.03);
}

.card-signal.warm strong {
  text-shadow: 0 0 8px rgba(240, 160, 64, 0.3);
}

.card-signal.green {
  color: var(--leaf);
  background: rgba(0, 180, 130, 0.04);
  border-color: rgba(0, 230, 160, 0.15);
  box-shadow: inset 0 0 20px rgba(0, 180, 130, 0.03);
}

.card-signal.green strong {
  text-shadow: 0 0 8px rgba(0, 230, 160, 0.3);
}

/* ── workflow section ── */
.workflow-section {
  color: var(--ink);
  background:
    radial-gradient(circle at 82% 18%, rgba(0, 180, 130, 0.04), transparent 26%),
    radial-gradient(circle at 15% 65%, rgba(0, 148, 204, 0.04), transparent 30%),
    radial-gradient(circle at 50% 100%, rgba(0, 148, 204, 0.03), transparent 35%),
    linear-gradient(135deg, #eaf2fb 0%, #e4eef8 42%, #e8f1fa 100%);
  box-shadow: inset 0 1px 0 rgba(0, 148, 204, 0.06);
}

.workflow-section .eyebrow {
  color: var(--water);
}

.workflow-head {
  max-width: 1180px;
  margin-bottom: 34px;
}

.workflow-head .section-heading {
  max-width: 850px;
  margin-bottom: 0;
}

.workflow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  max-width: 1180px;
}

.workflow article {
  position: relative;
  min-height: 210px;
  padding: 26px;
  border: 1px solid rgba(0, 148, 204, 0.18);
  border-right-width: 0;
  background:
    linear-gradient(180deg, rgba(235, 252, 255, 0.1) 0%, rgba(7, 28, 42, 0.42) 42%, rgba(4, 18, 30, 0.78) 100%),
    var(--workflow-image) center / cover no-repeat;
  backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16);
}

.workflow article:nth-child(1) {
  --workflow-image: url("assets/workflow-step-01-collect.jpg");
}

.workflow article:nth-child(2) {
  --workflow-image: url("assets/workflow-step-02-judge.jpg");
}

.workflow article:nth-child(3) {
  --workflow-image: url("assets/workflow-step-03-linkage.jpg");
}

.workflow article:nth-child(4) {
  --workflow-image: url("assets/workflow-step-04-review.jpg");
}

.workflow article:last-child {
  border-right-width: 1px;
}

.workflow article:not(:last-child)::after {
  position: absolute;
  top: 38px;
  right: -11px;
  z-index: 2;
  width: 22px;
  height: 22px;
  border-top: 1px solid rgba(0, 148, 204, 0.25);
  border-right: 1px solid rgba(0, 148, 204, 0.25);
  background: rgba(255, 255, 255, 0.95);
  content: "";
  transform: rotate(45deg);
}

/* glowing dot before each workflow step number */
.workflow article::before {
  content: "";
  position: absolute;
  top: 30px;
  left: 26px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--water);
  box-shadow: 0 0 10px var(--water), 0 0 30px rgba(0, 148, 204, 0.2);
  animation: glowPulse 2s ease-in-out infinite;
}

.workflow article:nth-child(2)::before { animation-delay: 0.5s; }
.workflow article:nth-child(3)::before { animation-delay: 1s; }
.workflow article:nth-child(4)::before { animation-delay: 1.5s; }

.workflow span {
  display: block;
  margin-bottom: 42px;
  margin-left: 18px;
  color: var(--water);
  font-size: 30px;
  font-weight: 900;
  line-height: 1;
  text-shadow: 0 0 20px rgba(0, 148, 204, 0.25);
}

.workflow strong {
  display: block;
  margin-bottom: 10px;
  font-size: 22px;
}

.workflow p {
  margin: 0;
  color: rgba(230, 245, 255, 0.86);
}

/* ── product visual ── */
.product-card ul {
  margin: 16px 0 24px;
  color: var(--muted);
}

.product-visual {
  position: relative;
  height: 190px;
  overflow: hidden;
  border-bottom: 1px solid var(--card-border);
  background:
    radial-gradient(circle at 28% 36%, rgba(240, 160, 64, 0.15), transparent 16%),
    linear-gradient(135deg, rgba(0, 184, 224, 0.25), rgba(0, 230, 160, 0.15));
}

.photo-visual::after {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(0, 40, 80, 0) 30%, rgba(0, 40, 80, 0.15) 100%),
    linear-gradient(90deg, rgba(0, 40, 80, 0.04), transparent 56%);
  content: "";
}

.photo-visual img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.92) contrast(1.05);
  transform: scale(1.02);
}

.product-card:nth-child(1) .photo-visual img {
  object-position: center 52%;
}

.product-card:nth-child(2) .photo-visual img {
  object-position: center 58%;
}

.product-card:nth-child(3) .photo-visual img {
  object-position: center 50%;
}

.product-card:nth-child(4) .photo-visual img {
  object-position: center 42%;
}

.photo-visual span {
  position: absolute;
  z-index: 1;
  left: 16px;
  bottom: 14px;
  padding: 6px 10px;
  border: 1px solid rgba(0, 148, 204, 0.2);
  border-radius: 999px;
  color: var(--water);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  font-size: 13px;
  font-weight: 800;
  box-shadow: 0 0 12px rgba(0, 148, 204, 0.1);
}

/* ── app visual (phone mock) ── */
.app-visual {
  display: grid;
  place-items: center;
  padding: 14px;
  background:
    radial-gradient(circle at 22% 18%, rgba(0, 148, 204, 0.08), transparent 18%),
    linear-gradient(145deg, #060e1c, #0a2e40 58%, #0a2820);
}

.phone-screen {
  width: min(100%, 220px);
  height: 160px;
  padding: 12px;
  border: 1px solid rgba(0, 148, 204, 0.15);
  border-radius: 18px;
  background: #0e2036;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.5), 0 0 30px rgba(0, 148, 204, 0.06);
}

.app-top,
.mini-card-head,
.mini-card-body,
.mini-params,
.mini-switches {
  display: grid;
}

.app-top {
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
  margin-bottom: 9px;
  color: var(--ink);
  font-size: 11px;
  font-weight: 800;
}

.app-top strong,
.mini-card-head span {
  padding: 2px 7px;
  border-radius: 999px;
  color: var(--leaf);
  background: rgba(0, 230, 160, 0.12);
  font-size: 10px;
}

.device-mini-card {
  padding: 10px;
  border-radius: 12px;
  background: rgba(0, 148, 204, 0.04);
  border: 1px solid rgba(0, 148, 204, 0.08);
  box-shadow: 0 4px 18px rgba(0, 40, 80, 0.06);
}

.mini-card-head {
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
  margin-bottom: 9px;
}

.mini-card-head strong {
  min-width: 0;
  overflow: hidden;
  color: var(--ink);
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mini-card-body {
  grid-template-columns: 0.85fr 1fr;
  gap: 8px;
}

.mini-params,
.mini-switches {
  gap: 5px;
}

.mini-params span,
.mini-switches span {
  border: 1px solid rgba(0, 148, 204, 0.08);
  border-radius: 8px;
  padding: 5px 6px;
  color: var(--muted);
  background: rgba(0, 148, 204, 0.04);
  font-size: 10px;
}

.mini-params strong {
  display: block;
  color: var(--ink);
  font-size: 11px;
}

.mini-switches span {
  text-align: center;
  font-weight: 800;
}

.mini-switches .on {
  color: #060e1c;
  border-color: var(--water);
  background: var(--water);
  box-shadow: 0 0 8px rgba(0, 148, 204, 0.25);
}

/* ── solutions section: deepest immersive band ── */
.section-band {
  color: var(--ink);
  background:
    radial-gradient(circle at 82% 18%, rgba(0, 180, 130, 0.04), transparent 26%),
    radial-gradient(circle at 15% 65%, rgba(0, 148, 204, 0.04), transparent 30%),
    radial-gradient(circle at 50% 100%, rgba(0, 148, 204, 0.03), transparent 35%),
    linear-gradient(135deg, #eaf2fb 0%, #e4eef8 42%, #e8f1fa 100%);
  box-shadow:
    inset 0 1px 0 rgba(0, 148, 204, 0.06);
}

.section-band .eyebrow {
  color: var(--water);
}

.section-band .section-heading {
  max-width: none;
}

.section-band .section-heading p:not(.eyebrow),
.section-band p,
.solution-summary p,
.solution-architecture p,
.solution-packages dd {
  color: var(--muted);
}

.solution-hero {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.48fr);
  gap: 36px;
  align-items: end;
  max-width: 1180px;
  min-height: 520px;
  padding: 58px 34px 46px;
  margin-bottom: 34px;
  border: 1px solid rgba(0, 148, 204, 0.12);
  border-radius: 8px;
  background:
    linear-gradient(90deg, rgba(6, 20, 32, 0.5) 0%, rgba(6, 20, 32, 0.3) 42%, rgba(6, 20, 32, 0.06) 100%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.05) 0%, rgba(6, 20, 32, 0.18) 100%),
    url("assets/solution-overview.jpg") center / cover no-repeat;
  box-shadow: 0 22px 48px rgba(0, 148, 204, 0.12);
  overflow: hidden;
}

.solution-hero .section-heading {
  position: relative;
  z-index: 1;
}

.solution-hero .eyebrow {
  color: var(--water);
}

.solution-hero .section-heading h2 {
  color: var(--white);
  text-shadow: 0 3px 22px rgba(0, 0, 0, 0.52);
}

.solution-hero .section-heading p:not(.eyebrow) {
  color: rgba(245, 252, 255, 0.82);
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.48);
}

.solution-summary {
  position: relative;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  backdrop-filter: none;
  box-shadow: none;
  overflow: hidden;
  isolation: isolate;
  display: flex;
  min-height: 300px;
  flex-direction: column;
  justify-content: flex-end;
}

.solution-summary::before {
  content: none;
}

/* scanline effect */
.solution-summary::after {
  content: none;
}

.solution-summary span,
.package-tag {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 5px 10px;
  border-radius: 999px;
  color: #060e1c;
  background: var(--water);
  font-size: 13px;
  font-weight: 900;
  box-shadow: 0 0 12px rgba(0, 148, 204, 0.2);
}

.solution-summary span {
  align-self: flex-start;
}

.solution-summary strong {
  display: block;
  margin-bottom: 10px;
  color: var(--white);
  font-size: 24px;
  line-height: 1.25;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.45);
}

.solution-summary-photo {
  display: none;
}

.solution-summary-photo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.solution-summary p {
  margin: 0;
  color: rgba(245, 252, 255, 0.88);
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.45);
}

.solution-architecture {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  max-width: 1180px;
  margin-bottom: 18px;
  border-top: 1px solid rgba(0, 148, 204, 0.1);
  border-left: 1px solid rgba(0, 148, 204, 0.1);
}

.solution-architecture article {
  position: relative;
  min-height: 210px;
  padding: 24px;
  border-right: 1px solid rgba(0, 148, 204, 0.1);
  border-bottom: 1px solid rgba(0, 148, 204, 0.1);
  background: rgba(0, 148, 204, 0.03);
  overflow: hidden;
}

.arch-photo {
  margin: -24px -24px 18px;
  overflow: hidden;
}

.arch-photo img {
  display: block;
  width: 100%;
  height: 180px;
  object-fit: cover;
}

/* connecting line between architecture steps */
.solution-architecture article:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 42px;
  right: -6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--water);
  box-shadow: 0 0 12px var(--water);
  z-index: 2;
  animation: glowPulse 2s ease-in-out infinite;
}

.solution-architecture span {
  display: block;
  margin-bottom: 34px;
  color: var(--water);
  font-size: 30px;
  font-weight: 900;
  line-height: 1;
  text-shadow: 0 0 20px rgba(0, 148, 204, 0.2);
}

.solution-architecture h3 {
  margin-bottom: 10px;
}

.solution-architecture p {
  margin: 0;
}

.solution-packages {
  display: grid;
  gap: 16px;
  max-width: 1180px;
}

.solution-packages article {
  display: grid;
  grid-template-columns: 78px minmax(250px, 0.42fr) minmax(0, 1fr);
  gap: 26px;
  align-items: start;
  padding: 28px;
  border: 1px solid rgba(0, 148, 204, 0.1);
  border-radius: 8px;
  background: rgba(0, 148, 204, 0.04);
  backdrop-filter: blur(12px);
  transition: border-color 0.3s, box-shadow 0.3s;
}

.solution-packages article:hover {
  border-color: rgba(0, 148, 204, 0.2);
  box-shadow: 0 0 40px rgba(0, 148, 204, 0.06);
}

.package-index {
  display: grid;
  place-items: center;
  width: 66px;
  height: 66px;
  border-radius: 8px;
  color: var(--water);
  background: rgba(0, 148, 204, 0.04);
  border: 1px solid rgba(0, 148, 204, 0.15);
  font-size: 34px;
  font-weight: 900;
  line-height: 1;
  text-shadow: none;
}

.package-photo {
  position: relative;
  overflow: hidden;
  min-height: 220px;
  margin: 0;
  border-radius: 8px;
  background: rgba(0, 148, 204, 0.05);
  border: 1px solid rgba(0, 148, 204, 0.08);
}

.package-photo::after {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(0, 40, 80, 0) 34%, rgba(0, 30, 60, 0.4) 100%),
    linear-gradient(90deg, rgba(0, 30, 60, 0.06), transparent 60%);
  content: "";
}

.package-photo img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.94) contrast(1.04);
}

.solution-packages article:nth-child(1) .package-photo img {
  object-position: center 58%;
}

.solution-packages article:nth-child(2) .package-photo img {
  object-position: center 50%;
}

.solution-packages article:nth-child(3) .package-photo img {
  object-position: center 54%;
}

.package-photo figcaption {
  position: absolute;
  z-index: 1;
  left: 14px;
  bottom: 12px;
  padding: 6px 10px;
  border: 1px solid rgba(0, 148, 204, 0.2);
  border-radius: 999px;
  color: var(--water);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  font-size: 13px;
  font-weight: 800;
}

.package-body h3 {
  margin-bottom: 8px;
  font-size: 26px;
}

.package-body > p:not(.package-tag) {
  max-width: 920px;
  margin-bottom: 18px;
}

.solution-packages dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.solution-packages dl div {
  padding: 14px 16px;
  border-radius: 8px;
  background: rgba(0, 148, 204, 0.04);
  border: 1px solid rgba(0, 148, 204, 0.08);
}

.solution-packages dt {
  margin-bottom: 6px;
  color: var(--water);
  font-size: 13px;
  font-weight: 900;
  text-shadow: 0 0 8px rgba(0, 148, 204, 0.2);
}

.solution-packages dd {
  margin: 0;
}

/* ── case cards ── */
.case-card {
  background: var(--card);
}

.case-card::after {
  display: none;
}

.case-photo {
  position: relative;
  height: clamp(190px, 13.5vw, 230px);
  margin: 0;
  overflow: hidden;
  background: #f0f6fc;
}

.case-photo::after {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(0, 30, 60, 0.02) 20%, rgba(0, 30, 60, 0.15) 100%),
    linear-gradient(90deg, rgba(0, 30, 60, 0.05), transparent 58%);
  content: "";
}

.case-photo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.95) contrast(1.04);
  transform: scale(1.02);
}

.case-card:nth-child(1) .case-photo img {
  object-position: center 52%;
}

.case-card:nth-child(2) .case-photo img {
  object-position: center 56%;
}

.case-card:nth-child(3) .case-photo img {
  object-position: center 50%;
}

.case-photo figcaption {
  position: absolute;
  z-index: 1;
  left: 16px;
  bottom: 14px;
  padding: 6px 10px;
  border: 1px solid rgba(0, 148, 204, 0.2);
  border-radius: 999px;
  color: var(--water);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  font-size: 13px;
  font-weight: 800;
  box-shadow: 0 0 10px rgba(0, 148, 204, 0.1);
}

.case-content {
  position: relative;
  padding: 24px 28px 28px;
}

.case-content::after {
  position: absolute;
  right: -42px;
  bottom: -42px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: rgba(0, 148, 204, 0.03);
  content: "";
}

.case-tag {
  position: relative;
  z-index: 1;
  display: inline-flex;
  margin-bottom: 16px;
  padding: 4px 10px;
  border-radius: 8px;
  color: var(--water);
  background: rgba(0, 148, 204, 0.06);
  border: 1px solid rgba(0, 148, 204, 0.15);
  font-size: 13px;
  font-weight: 800;
}

.case-card h3,
.case-card p,
.case-stats {
  position: relative;
  z-index: 1;
}

.case-note {
  max-width: 740px;
  margin: -12px 0 30px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.case-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 18px 0 18px;
}

.case-stats span {
  position: relative;
  padding: 13px 14px;
  border: 1px solid rgba(0, 148, 204, 0.08);
  border-radius: 8px;
  color: var(--muted);
  background: rgba(0, 148, 204, 0.04);
  font-size: 13px;
  overflow: hidden;
}

/* subtle data-bar decoration inside stats */
.case-stats span::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(0, 148, 204, 0.2), transparent);
}

.case-stats strong {
  display: block;
  color: var(--water);
  font-size: 24px;
  line-height: 1.05;
  text-shadow: 0 0 10px rgba(0, 148, 204, 0.2);
}

/* ── service section: mid panel with distinct tone ── */
.section-service {
  background:
    radial-gradient(circle at 70% 20%, rgba(0, 148, 204, 0.05), transparent 30%),
    radial-gradient(circle at 20% 70%, rgba(0, 180, 130, 0.03), transparent 28%),
    linear-gradient(180deg, #f0f6fc 0%, #e8f1fa 50%, #f0f6fc 100%);
}

.service-showcase {
  position: relative;
  overflow: hidden;
  margin: -8px 0 26px;
  border-radius: 8px;
  background: #f0f6fc;
  border: 1px solid rgba(0, 148, 204, 0.1);
  box-shadow: 0 0 40px rgba(0, 148, 204, 0.06), var(--shadow);
}

.service-showcase::after {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.92) 0%, rgba(0, 40, 80, 0.15) 34%, rgba(0, 40, 80, 0.02) 68%),
    linear-gradient(180deg, rgba(0, 30, 60, 0.02), rgba(0, 30, 60, 0.1));
  content: "";
}

.service-showcase img {
  display: block;
  width: 100%;
  height: clamp(320px, 32vw, 500px);
  object-fit: cover;
  object-position: center;
  filter: saturate(0.96) contrast(1.04);
}

.service-showcase figcaption {
  position: absolute;
  z-index: 1;
  left: 32px;
  bottom: 30px;
  max-width: 520px;
  color: var(--white);
}

.service-showcase span {
  display: inline-flex;
  margin-bottom: 14px;
  padding: 6px 10px;
  border: 1px solid rgba(0, 148, 204, 0.2);
  border-radius: 999px;
  color: var(--water);
  background: rgba(0, 40, 80, 0.15);
  backdrop-filter: blur(8px);
  font-size: 13px;
  font-weight: 900;
  box-shadow: 0 0 12px rgba(0, 148, 204, 0.1);
}

.service-showcase strong {
  display: block;
  max-width: 16em;
  font-size: clamp(26px, 3vw, 44px);
  line-height: 1.14;
  text-shadow: 0 0 20px rgba(0, 148, 204, 0.1);
}

.service-card {
  overflow: hidden;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  background: var(--card);
  box-shadow: var(--glow);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}

.service-card:hover {
  border-color: rgba(0, 148, 204, 0.2);
  box-shadow: 0 0 50px rgba(0, 148, 204, 0.08);
  transform: translateY(-3px);
}

.service-photo {
  position: relative;
  height: 170px;
  margin: 0;
  overflow: hidden;
  background: #f0f6fc;
}

.service-photo::after {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(0, 30, 60, 0.02) 24%, rgba(0, 40, 80, 0.15) 100%),
    linear-gradient(90deg, rgba(0, 30, 60, 0.05), transparent 58%);
  content: "";
}

.service-photo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.04);
  transform: scale(1.02);
}

.service-card:nth-child(1) .service-photo img {
  object-position: center 52%;
}

.service-card:nth-child(2) .service-photo img {
  object-position: center 50%;
}

.service-card:nth-child(3) .service-photo img {
  object-position: center 48%;
}

.service-card:nth-child(4) .service-photo img {
  object-position: center 46%;
}

.service-photo figcaption {
  position: absolute;
  z-index: 1;
  left: 14px;
  bottom: 12px;
  padding: 6px 10px;
  border: 1px solid rgba(0, 148, 204, 0.2);
  border-radius: 999px;
  color: var(--water);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  font-size: 13px;
  font-weight: 800;
}

.service-body {
  min-height: 146px;
  padding: 22px 24px 24px;
  border-left: 4px solid var(--water);
  box-shadow: inset 4px 0 16px rgba(0, 148, 204, 0.06);
}

.service-steps strong,
.service-steps span {
  display: block;
}

.service-steps strong {
  margin-bottom: 12px;
  font-size: 20px;
}

.service-steps span {
  color: var(--muted);
}

/* ── contact: recessed bottom band ── */
.contact {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.7fr);
  gap: 40px;
  padding: 88px clamp(20px, 5vw, 72px);
  color: var(--ink);
  background:
    radial-gradient(circle at 80% 30%, rgba(0, 148, 204, 0.04), transparent 30%),
    linear-gradient(180deg, #f0f6fc 0%, #e8f1fa 100%);
  box-shadow: inset 0 1px 0 rgba(0, 148, 204, 0.06);
  border-top: 1px solid rgba(0, 148, 204, 0.1);
}

.contact .eyebrow {
  color: var(--water);
}

.contact-copy {
  max-width: 680px;
}

.contact-lines {
  display: grid;
  gap: 10px;
  margin-top: 28px;
  color: var(--muted);
}

.contact-form {
  position: relative;
  display: grid;
  gap: 18px;
  padding: 30px;
  border-radius: 8px;
  color: var(--ink);
  background: var(--card);
  border: 1px solid rgba(0, 148, 204, 0.1);
  box-shadow: 0 0 40px rgba(0, 148, 204, 0.04);
  overflow: hidden;
}

/* form top glow line */
.contact-form::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 10%, var(--water) 50%, transparent 90%);
  opacity: 0.5;
}

.contact-form label {
  display: grid;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.45;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  border: 1px solid rgba(0, 148, 204, 0.08);
  border-radius: 8px;
  padding: 12px 14px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.5;
  background: rgba(0, 148, 204, 0.04);
  transition: border-color 0.3s, box-shadow 0.3s;
}

.contact-form select {
  width: 125%;
  max-width: 100%;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(90, 122, 148, 0.58);
  font-weight: 500;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: rgba(0, 148, 204, 0.3);
  box-shadow: 0 0 16px rgba(0, 148, 204, 0.08);
}

.contact-form textarea {
  resize: vertical;
}

.contact-form select option {
  background: #f0f6fc;
  color: var(--ink);
}

.form-note {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.contact-form .privacy-consent {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.65;
}

.privacy-consent input {
  width: 16px;
  height: 16px;
  margin-top: 5px;
  accent-color: var(--water);
}

.privacy-consent a {
  color: var(--water);
  font-weight: 800;
}

.form-status {
  min-height: 22px;
  margin: 0;
  color: var(--water);
  font-size: 13px;
  font-weight: 700;
}

.contact-form .btn-primary {
  color: var(--white);
  font-size: 15px;
  font-weight: 700;
}

.legal-page,
.not-found-page {
  background:
    radial-gradient(circle at 15% 18%, rgba(0, 148, 204, 0.08), transparent 30%),
    linear-gradient(180deg, #f3f9fe 0%, #eaf5fc 100%);
}

.legal-page h1,
.not-found-page h1 {
  margin-bottom: 16px;
  font-size: clamp(42px, 6vw, 72px);
  line-height: 1.04;
}

.legal-content {
  max-width: 920px;
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid rgba(0, 148, 204, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 0 40px rgba(0, 148, 204, 0.05), var(--shadow);
}

.legal-content h2 {
  margin: 22px 0 8px;
  font-size: 24px;
}

.legal-content h2:first-child {
  margin-top: 0;
}

.legal-content p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.9;
}

.not-found-page {
  min-height: 70vh;
}

/* ── footer ── */
.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  padding: 24px clamp(20px, 5vw, 72px);
  color: var(--muted);
  background: #e8f1fa;
  border-top: 1px solid rgba(0, 148, 204, 0.08);
  font-size: 14px;
}

.site-footer small {
  flex-basis: 100%;
  color: rgba(80, 110, 140, 0.6);
  font-size: 12px;
}

.site-footer a {
  color: var(--water);
  text-decoration: underline;
  text-underline-offset: 3px;
  opacity: 0.6;
}

.site-footer .beian-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  vertical-align: middle;
}

.site-footer .beian-icon {
  width: 14px;
  height: 14px;
}

.site-footer a:hover {
  opacity: 1;
  text-shadow: 0 0 8px rgba(0, 148, 204, 0.25);
}

/* ── responsive ── */
@media (max-width: 960px) {
  .intro-feature {
    grid-template-columns: 1fr;
  }

  .workflow-head {
    grid-template-columns: 1fr;
  }

  .detail-hero-grid,
  .detail-content {
    grid-template-columns: 1fr;
  }

  .intro-grid,
  .product-grid,
  .case-grid,
  .service-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .home-overview-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .workflow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .solution-hero,
  .solution-packages article {
    grid-template-columns: 1fr;
  }

  .download-hero,
  .download-grid {
    grid-template-columns: 1fr;
  }

  .download-panel {
    justify-self: start;
  }

  .package-photo,
  .package-photo img {
    min-height: 250px;
  }

  .solution-architecture {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .workflow article {
    border-right-width: 1px;
  }

  .workflow article::after {
    display: none;
  }

  .contact {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site-header {
    padding: 10px 16px;
    gap: 12px;
    color: var(--ink);
    background: rgba(255, 255, 255, 0.96);
    border-bottom-color: rgba(0, 148, 204, 0.08);
    box-shadow: 0 2px 18px rgba(0, 40, 80, 0.08);
    backdrop-filter: blur(18px);
  }

  .brand {
    min-width: 0;
    gap: 10px;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }

  .brand strong {
    font-size: 16px;
    line-height: 1.1;
  }

  .brand small {
    font-size: 11px;
  }

  .nav-toggle {
    display: block;
    flex: 0 0 auto;
  }

  .site-nav {
    position: absolute;
    top: 62px;
    left: 14px;
    right: 14px;
    display: none;
    padding: 16px;
    border: 1px solid rgba(0, 148, 204, 0.1);
    border-radius: 8px;
    color: var(--ink);
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 0 40px rgba(0, 148, 204, 0.06), var(--shadow);
    backdrop-filter: blur(20px);
    max-height: calc(100vh - 84px);
    overflow-y: auto;
  }

  .site-nav a {
    min-height: 38px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid rgba(0, 148, 204, 0.08);
  }

  .site-nav a:last-child {
    border-bottom: 0;
  }

  .site-header.is-open .site-nav {
    display: grid;
    gap: 4px;
  }

  h1 {
    font-size: clamp(42px, 15vw, 64px);
    line-height: 1;
  }

  h2 {
    font-size: clamp(28px, 9vw, 38px);
  }

  .hero {
    min-height: auto;
    padding: 118px 20px 42px;
    align-items: start;
    color: var(--ink);
    background: linear-gradient(180deg, #f7fbff 0%, #edf6fc 100%);
  }

  .hero-media {
    background-position: 60% center;
    opacity: 0.16;
    transform: scale(1.04);
  }

  .hero-content {
    max-width: none;
  }

  .hero h1,
  .download-copy h1 {
    color: var(--ink);
    text-shadow: none;
  }

  .hero .eyebrow,
  .download-hero .eyebrow {
    text-shadow: none;
  }

  .hero-lead,
  .download-lead {
    color: var(--muted);
  }

  .mobile-hero-card {
    position: relative;
    display: block;
    height: 200px;
    margin: 18px 0 22px;
    border: 1px solid rgba(0, 148, 204, 0.12);
    border-radius: 8px;
    background:
      linear-gradient(180deg, rgba(0, 30, 60, 0) 42%, rgba(0, 30, 60, 0.55) 100%),
      url("assets/aquaculture-hero.jpg") 68% center / cover no-repeat;
    box-shadow: 0 18px 42px rgba(0, 40, 80, 0.12);
    overflow: hidden;
  }

  .mobile-hero-card figcaption {
    position: absolute;
    left: 18px;
    right: 18px;
    bottom: 16px;
    margin: 0;
    color: var(--white);
    font-size: 14px;
    font-weight: 800;
    text-shadow: 0 2px 12px rgba(0, 20, 38, 0.35);
  }

  .download-hero {
    min-height: auto;
    gap: 24px;
    padding: 118px 20px 48px;
    color: var(--ink);
    background:
      linear-gradient(180deg, rgba(247, 251, 255, 0.94) 0%, rgba(237, 246, 252, 0.98) 100%),
      url("assets/aquaculture-hero.jpg") 60% center / cover no-repeat;
  }

  .download-copy h1 {
    font-size: clamp(40px, 13vw, 58px);
  }

  .hero-lead,
  .download-lead {
    font-size: 17px;
    line-height: 1.75;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin: 24px 0;
  }

  .btn {
    width: 100%;
    min-height: 50px;
  }

  .download-stats {
    display: grid;
    grid-template-columns: 1fr;
  }

  .download-stats span {
    min-width: 0;
  }

  .download-panel {
    width: 100%;
    padding: 24px;
  }

  .download-app-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 18px;
    border-radius: 12px;
    font-size: 27px;
  }

  .download-specs div {
    grid-template-columns: 72px minmax(0, 1fr);
  }

  .hero-shade {
    background: linear-gradient(180deg, rgba(247, 251, 255, 0.92) 0%, rgba(237, 246, 252, 0.98) 100%);
  }

  .hero-metrics span {
    flex: 1 1 100%;
    min-width: 0;
    color: var(--ink);
    border-color: rgba(0, 148, 204, 0.16);
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: none;
  }

  .hero-metrics strong {
    color: var(--water);
  }

  .download-stats span,
  .download-panel,
  .install-steps,
  .download-checksum {
    background: rgba(255, 255, 255, 0.84);
    box-shadow: 0 12px 34px rgba(0, 40, 80, 0.08);
  }

  .download-panel h2 {
    color: var(--ink);
  }

  .download-panel p,
  .download-specs dt {
    color: var(--muted);
  }

  .download-specs div {
    border-top-color: rgba(0, 148, 204, 0.12);
  }

  .download-specs dd {
    color: var(--ink);
  }

  .download-grid {
    gap: 14px;
  }

  .install-steps,
  .download-checksum {
    padding: 22px;
  }

  .download-checksum code {
    font-size: 12px;
  }

  .download-note {
    font-size: 14px;
  }

  .section,
  .contact {
    padding: 64px 20px;
  }

  .company-cover-link {
    min-height: 520px;
    padding: 28px;
    background-position: 62% center;
  }

  .company-cover-slogan {
    margin: 26px 0 20px;
  }

  .company-about-content {
    padding: 24px;
  }

  .intro-grid,
  .product-grid,
  .case-grid,
  .service-steps,
  .home-overview-grid,
  .workflow,
  .solution-architecture,
  .solution-packages dl {
    grid-template-columns: 1fr;
  }

  .crab-photo-card,
  .crab-photo-card img {
    min-height: 310px;
  }

  .crab-photo-card figcaption {
    left: 18px;
    right: 18px;
    bottom: 18px;
  }

  .crab-photo-card figcaption strong {
    font-size: 20px;
  }

  .card-signal {
    align-items: flex-start;
    flex-direction: column;
  }

  .service-showcase img {
    height: 360px;
    object-position: 62% center;
  }

  .service-showcase::after {
    background:
      linear-gradient(180deg, rgba(0, 30, 60, 0.1) 0%, rgba(0, 30, 60, 0.4) 100%);
  }

  .service-showcase figcaption {
    left: 18px;
    right: 18px;
    bottom: 18px;
  }

  .service-showcase strong {
    max-width: 14em;
    font-size: 26px;
  }

  .solution-summary,
  .solution-architecture article,
  .solution-packages article {
    padding: 22px;
  }

  .package-photo,
  .package-photo img {
    min-height: 210px;
  }

  .package-index {
    width: 54px;
    height: 54px;
    font-size: 28px;
  }

  .site-footer {
    display: grid;
  }
}