:root {
  --bg: #030712;
  --bg-soft: #07111f;
  --surface: rgba(15, 23, 42, 0.72);
  --surface-solid: #0b1526;
  --line: rgba(148, 163, 184, 0.16);
  --line-strong: rgba(56, 189, 248, 0.35);
  --text: #e6edf7;
  --muted: #94a3b8;
  --cyan: #22d3ee;
  --blue: #38bdf8;
  --indigo: #6366f1;
  --radius: 18px;
  --shadow: 0 24px 70px rgba(2, 6, 23, 0.55);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, #22d3ee, #818cf8);
}

.typed-cursor {
  color: var(--cyan);
  font-weight: 700;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.back-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 60;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: rgba(15, 23, 42, 0.82);
  color: var(--cyan);
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
  backdrop-filter: blur(8px);
}

.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.spotlight {
  position: relative;
}

.spotlight::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
  background: radial-gradient(260px circle at var(--mx, 50%) var(--my, 50%), rgba(56, 189, 248, 0.16), transparent 65%);
}

.spotlight:hover::after {
  opacity: 1;
}

body {
  margin: 0;
  font-family: "HarmonyOS Sans SC", "MiSans", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 700px at 82% -8%, rgba(56, 189, 248, 0.16), transparent 55%),
    radial-gradient(1000px 700px at 8% 18%, rgba(99, 102, 241, 0.12), transparent 52%),
    var(--bg);
  line-height: 1.6;
  overflow-x: hidden;
}

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

img, svg {
  max-width: 100%;
  display: block;
}

#starfield {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  pointer-events: none;
}

.container {
  width: min(1180px, 92vw);
  margin: 0 auto;
}

.section {
  position: relative;
  padding: 110px 0;
}

.section-alt {
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.38), rgba(3, 7, 18, 0) 30%, rgba(3, 7, 18, 0) 70%, rgba(15, 23, 42, 0.38));
  box-shadow: inset 0 1px 0 rgba(148, 163, 184, 0.06), inset 0 -1px 0 rgba(148, 163, 184, 0.04);
}

.grad-text {
  background: linear-gradient(92deg, #7dd3fc 0%, #38bdf8 42%, #818cf8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section-head {
  max-width: 720px;
  margin-bottom: 54px;
  position: relative;
}

.section-head.centered {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 18px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.05);
}

.section-kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--blue);
}

.section-kicker,
.section h2,
.section-sub {
  position: relative;
  z-index: 1;
}

.section h2 {
  font-size: clamp(30px, 4.5vw, 48px);
  line-height: 1.14;
  margin: 0 0 18px;
  font-weight: 800;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.section-sub {
  color: var(--muted);
  font-size: 17px;
  max-width: 620px;
  margin: 0;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(3, 7, 18, 0.72);
  backdrop-filter: blur(18px);
  border-bottom-color: var(--line);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 24px;
  position: relative;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
}

.brand-mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  color: var(--cyan);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: rgba(56, 189, 248, 0.06);
  box-shadow: 0 0 26px rgba(56, 189, 248, 0.18);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-text strong {
  font-size: 17px;
  letter-spacing: 0.04em;
}

.brand-text small {
  color: var(--muted);
  font-size: 9px;
  letter-spacing: 0.18em;
  margin-top: 4px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 26px;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.nav a {
  color: #cbd5e1;
  font-size: 14px;
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
}

.nav a:hover {
  color: var(--cyan);
}

.nav a.active {
  color: var(--cyan);
}

.nav-cta {
  flex-shrink: 0;
}

.menu-toggle {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  width: 38px;
  height: 38px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.menu-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: 0.25s ease;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  color: #04121f;
  background: linear-gradient(135deg, #67e8f9, #38bdf8);
  box-shadow: 0 10px 30px rgba(56, 189, 248, 0.28);
}

.btn-primary:hover {
  box-shadow: 0 14px 38px rgba(56, 189, 248, 0.38);
}

.btn-ghost {
  color: var(--text);
  border-color: var(--line);
  background: rgba(148, 163, 184, 0.06);
}

.btn-ghost:hover {
  border-color: var(--line-strong);
  background: rgba(56, 189, 248, 0.08);
}

.btn-block {
  width: 100%;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 130px 0 64px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(circle at 50% 38%, #000 0%, transparent 78%);
  mask-image: radial-gradient(circle at 50% 38%, #000 0%, transparent 78%);
  pointer-events: none;
}

.hero-orb {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 760px;
  height: 760px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(56, 189, 248, 0.12), transparent 60%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 40px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.55);
  color: #cbd5e1;
  font-size: 13px;
  letter-spacing: 0.08em;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.55);
  animation: pulse 2.4s infinite;
}

@keyframes pulse {
  70% { box-shadow: 0 0 0 9px rgba(34, 211, 238, 0); }
  100% { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0); }
}

.hero h1 {
  font-size: clamp(42px, 6vw, 74px);
  line-height: 1.02;
  margin: 26px 0 24px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.hero-lead {
  color: #b8c5d8;
  font-size: 18px;
  max-width: 540px;
  margin: 0 0 34px;
}

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

.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
}

.orbit-scene {
  width: min(520px, 100%);
  height: auto;
}

.orbit {
  fill: none;
  stroke: #334155;
  stroke-width: 1;
}

.orbit-a {
  stroke: rgba(56, 189, 248, 0.28);
}

.orbit-b {
  stroke: rgba(129, 140, 248, 0.25);
}

.satellite {
  animation: float 7s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

.hero-tag {
  position: absolute;
  padding: 8px 13px;
  border: 1px solid var(--line-strong);
  background: rgba(3, 7, 18, 0.72);
  color: #dbeafe;
  border-radius: 12px;
  font-size: 12px;
  letter-spacing: 0.04em;
  box-shadow: var(--shadow);
}

.tag-1 { top: 18%; left: 3%; }
.tag-2 { top: 22%; right: 4%; }
.tag-3 { bottom: 12%; left: 18%; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
  margin-top: 40px;
  padding-top: 30px;
  border-top: 1px solid var(--line);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat strong {
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1;
  font-weight: 800;
  background: linear-gradient(180deg, #fff, #7dd3fc);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat span {
  color: var(--muted);
  font-size: 13px;
}

/* Cards / grids */
.grid {
  display: grid;
  gap: 22px;
}

.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.four { grid-template-columns: repeat(4, 1fr); }

.card, .feature, .advantage {
  position: relative;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  backdrop-filter: blur(12px);
  overflow: hidden;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.card::before, .feature::before, .advantage::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(56, 189, 248, 0.6), transparent);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.card:hover, .feature:hover, .advantage:hover {
  transform: translateY(-5px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
}

.card:hover::before, .feature:hover::before, .advantage:hover::before {
  opacity: 1;
}

.card-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  color: var(--cyan);
  background: rgba(56, 189, 248, 0.09);
  border: 1px solid var(--line-strong);
  margin-bottom: 18px;
}

.card-icon svg, .brand-mark svg {
  width: 24px;
  height: 24px;
}

.card h3, .feature h3, .advantage h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
}

.card p, .feature p, .advantage p {
  color: var(--muted);
  margin: 0;
  font-size: 15px;
}

.feature {
  min-height: 210px;
}

.feature-num {
  display: block;
  font-size: 13px;
  letter-spacing: 0.15em;
  color: var(--blue);
  margin-bottom: 28px;
}

.advantage-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  color: var(--cyan);
  font-size: 13px;
  margin-bottom: 22px;
  background: rgba(56, 189, 248, 0.06);
}

/* Split layout */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.split-reverse .split-copy { order: 2; }
.split-reverse .split-visual { order: 1; }

.split-copy h2 {
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.14;
  margin: 0 0 18px;
  font-weight: 800;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.split-copy .section-kicker {
  margin-bottom: 16px;
}

.split-copy .section-sub {
  margin-bottom: 26px;
}

.split-visual {
  display: grid;
  place-items: center;
}

.info-cards {
  display: grid;
  gap: 14px;
  width: 100%;
}

.info-card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
}

.info-card h4 {
  margin: 0 0 6px;
  font-size: 15px;
  color: var(--cyan);
}

.info-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.sat-photo {
  width: min(460px, 100%);
  height: auto;
  border-radius: 20px;
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow);
}

.photo-figure {
  margin: 0;
}

.photo-figure figcaption {
  margin-top: 10px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.map-photo {
  width: min(540px, 100%);
  height: auto;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow);
}

.map-frame {
  position: relative;
  margin: 0;
  width: min(540px, 100%);
}

.map-frame .map-photo {
  width: 100%;
  display: block;
}

.map-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(3, 7, 18, 0.08), rgba(3, 7, 18, 0.38));
  mix-blend-mode: multiply;
  pointer-events: none;
}

.check-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.check-list li {
  position: relative;
  padding-left: 28px;
  color: #cbd5e1;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: radial-gradient(circle at 4px 4px, rgba(34, 211, 238, 0.9) 0 2px, transparent 3px);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chips span {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: #dbeafe;
  font-size: 14px;
  background: rgba(56, 189, 248, 0.05);
}

.marquee {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  padding: 13px 0;
  position: relative;
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee 30s linear infinite;
}

.marquee-track span,
.marquee-track a {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 0 28px;
  color: #dbeafe;
  font-size: 15px;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.marquee-track span::before,
.marquee-track a::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  opacity: 0.7;
}

.marquee-track a:hover {
  color: var(--cyan);
}

.marquee:hover .marquee-track {
  animation-play-state: paused;
}

@keyframes marquee {
  to { transform: translateX(-50%); }
}

/* Specs */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.spec {
  background: var(--surface-solid);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.spec-label {
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.spec strong {
  font-size: 22px;
  font-weight: 750;
  color: #e0f2fe;
}

/* Applications */
.app-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.app {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  text-align: center;
  color: #dbeafe;
  font-size: 15px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.app:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
}

/* Timeline */
.timeline {
  position: relative;
  display: grid;
  gap: 20px;
  padding-left: 24px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--indigo));
  opacity: 0.5;
}

.timeline-item {
  position: relative;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--cyan);
}

.year {
  color: var(--cyan);
  font-weight: 800;
  font-size: 18px;
}

.timeline-item p {
  color: var(--muted);
  margin: 8px 0 0;
}

/* Team */
.team-group {
  margin-bottom: 42px;
}

.team-group:last-child {
  margin-bottom: 0;
}

.team-label {
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
  margin: 0 0 18px;
}

.person {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  backdrop-filter: blur(12px);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.person:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
}

.person-photo {
  width: 96px;
  height: 128px;
  flex-shrink: 0;
  object-fit: cover;
  object-position: center top;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: rgba(15, 23, 42, 0.5);
}

.person-body {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.person h4 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
}

.person p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.person .person-desc {
  color: #cbd5e1;
  margin-top: 2px;
}

/* Comparison table */
.compare-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.compare-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 14px;
}

.compare-table th,
.compare-table td {
  padding: 16px 18px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  color: #cbd5e1;
}

.compare-table thead th {
  color: var(--text);
  font-weight: 700;
  background: rgba(15, 23, 42, 0.6);
}

.compare-table th:first-child,
.compare-table td:first-child {
  color: var(--muted);
  white-space: nowrap;
}

.compare-table .highlight-col {
  background: rgba(56, 189, 248, 0.06);
  color: #e0f2fe;
  font-weight: 650;
}

.compare-table tbody tr:last-child td {
  border-bottom: 0;
}

/* Business flow & partners */
.flow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 38px;
}

.flow-step {
  flex: 1 1 150px;
  padding: 18px 14px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  color: #e0f2fe;
}

.flow-arrow {
  color: var(--cyan);
  font-size: 20px;
  line-height: 1;
}

.partner-block {
  margin-top: 32px;
}

.partner-note {
  color: var(--muted);
  font-size: 14px;
  margin: 14px 0 0;
}

.finance-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.finance {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 16px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
}

.finance strong {
  font-size: 22px;
  color: #e0f2fe;
}

.finance span {
  color: var(--muted);
  font-size: 13px;
}

.policy-strip {
  margin-top: 34px;
  padding: 24px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.policy-strip p {
  margin: 0;
  color: #cbd5e1;
  font-size: 15px;
}

/* Contact */
.contact-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  padding: 54px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.85), rgba(30, 58, 138, 0.25));
  backdrop-filter: blur(16px);
}

.contact-copy h2 {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.12;
  margin: 0 0 18px;
  font-weight: 800;
}

.contact-copy p {
  color: var(--muted);
  margin: 0 0 28px;
}

.contact-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  color: #cbd5e1;
  font-size: 15px;
}

.contact-meta span:last-child {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.contact-form {
  display: grid;
  gap: 14px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(3, 7, 18, 0.6);
  color: var(--text);
  padding: 13px 15px;
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--line-strong);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.1);
}

.contact-form textarea {
  resize: vertical;
}

.form-note {
  min-height: 18px;
  margin: 0;
  font-size: 13px;
  color: #6ee7b7;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 40px 0;
  background: rgba(3, 7, 18, 0.7);
}

.footer-wrap {
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr 1fr;
  gap: 34px;
  align-items: start;
  color: var(--muted);
  font-size: 14px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--text);
  font-weight: 650;
  margin-bottom: 8px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col h4 {
  margin: 0 0 2px;
  color: var(--text);
  font-size: 14px;
  letter-spacing: 0.04em;
}

.footer-col p {
  margin: 0;
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col ul a {
  color: var(--muted);
}

.footer-col ul a:hover {
  color: var(--cyan);
}

.footer-social {
  display: flex;
  gap: 10px;
}

.footer-social span {
  padding: 6px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 34px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}

.footer-bottom p {
  margin: 0;
}

/* Layered depth */
.card,
.feature,
.advantage,
.person,
.info-card,
.app,
.finance,
.flow-step,
.timeline-item,
.policy-strip {
  box-shadow:
    0 18px 38px -28px rgba(2, 6, 23, 0.9),
    inset 0 1px 0 rgba(148, 163, 184, 0.07);
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* Responsive */
@media (max-width: 960px) {
  .nav {
    position: absolute;
    top: 76px;
    right: 0;
    left: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 10px 4vw 18px;
    background: rgba(3, 7, 18, 0.96);
    border-bottom: 1px solid var(--line);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: 0.25s ease;
  }

  .nav.open {
    transform: none;
    opacity: 1;
    pointer-events: auto;
  }

  .nav a {
    padding: 14px 0;
    width: 100%;
  }

  .nav-cta {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

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

  .hero-visual {
    order: 2;
  }

  .split-reverse .split-copy { order: 1; }
  .split-reverse .split-visual { order: 2; }

  .grid.three,
  .grid.four {
    grid-template-columns: 1fr 1fr;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

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

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

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

  .contact-panel {
    grid-template-columns: 1fr;
    padding: 34px;
  }

  .footer-wrap {
    grid-template-columns: 1fr 1fr;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .grid.three,
  .grid.four {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .hero-tag {
    display: none;
  }
}

/* ===== 动态内容：轮播 Hero ===== */
.carousel-hero {
  min-height: 90vh;
  padding: 76px 0 0;
  display: flex;
  flex-direction: column;
}

.carousel {
  position: relative;
  flex: 1 1 0;
  min-height: 0;
  width: 100%;
  overflow: hidden;
}

.carousel-track {
  display: flex;
  height: 100%;
  min-height: 100%;
  transition: transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.carousel-slide {
  position: relative;
  min-width: 100%;
  height: 100%;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.carousel-slide::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(90deg, rgba(3, 7, 18, 0.92), rgba(3, 7, 18, 0.45) 55%, rgba(3, 7, 18, 0.12));
}

.carousel-slide img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 88%;
}

.carousel-slide-content {
  position: relative;
  z-index: 2;
  max-width: 1120px;
  padding: 0 5vw 72px;
  align-self: flex-start;
  text-align: left;
}

.carousel-slide-content .slide-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: 0.18em;
  margin-bottom: 18px;
}

.carousel-slide-content h2 {
  font-size: clamp(34px, 6vw, 68px);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0;
}

.carousel-slide-content p {
  color: #cbd5e1;
  font-size: 18px;
  margin: 20px 0 0;
  max-width: 560px;
}

.carousel-slide-content .btn {
  margin-top: 30px;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: rgba(3, 7, 18, 0.55);
  color: var(--cyan);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.carousel-btn.prev { left: 20px; }
.carousel-btn.next { right: 20px; }

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 14px 0 0;
}

.carousel-dots span {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.4);
  transition: 0.3s ease;
  cursor: pointer;
}

.carousel-dots span.active {
  width: 30px;
  background: var(--cyan);
}

@media (max-width: 640px) {
  .carousel-btn { display: none; }
}

/* ===== 中国电信官网风格增强 ===== */
/* 下拉导航 */
.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: #cbd5e1;
  font-size: 14px;
  letter-spacing: 0.02em;
  padding: 8px 0;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--cyan);
}

.nav-caret {
  font-style: normal;
  font-size: 10px;
  opacity: 0.65;
  transform: translateY(1px);
}

.dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  min-width: 176px;
  padding: 8px;
  margin-top: 6px;
  background: rgba(5, 11, 24, 0.96);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(-50%) translateY(8px);
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease;
  z-index: 65;
}

.dropdown::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  right: 0;
  height: 6px;
}

.nav-item:hover .dropdown,
.nav-item:focus-within .dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.dropdown a {
  display: block;
  padding: 9px 13px;
  color: #cbd5e1;
  font-size: 13.5px;
  border-radius: 9px;
  white-space: nowrap;
}

.dropdown a:hover {
  color: var(--cyan);
  background: rgba(56, 189, 248, 0.08);
}

/* 快捷入口 */
.quick-section {
  padding: 60px 0 70px;
}

.quick-panel {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 28px;
  align-items: center;
  padding: 28px 30px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(8, 15, 30, 0.88);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.quick-intro {
  padding-right: 26px;
  border-right: 1px solid var(--line);
}

.quick-intro .section-kicker {
  margin-bottom: 14px;
}

.quick-intro h3 {
  margin: 0 0 8px;
  font-size: 25px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.quick-intro p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.quick {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 7px;
  padding: 15px 14px;
  border: 1px solid transparent;
  border-radius: 14px;
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}

.quick:hover {
  background: rgba(56, 189, 248, 0.07);
  border-color: var(--line-strong);
  transform: translateY(-3px);
}

.quick svg {
  width: 25px;
  height: 25px;
  stroke: var(--cyan);
}

.quick span {
  color: #e0f2fe;
  font-size: 15px;
  font-weight: 650;
}

.quick small {
  color: var(--muted);
  font-size: 12px;
}

/* 三大业务板块 */
.biz-section {
  padding-top: 24px;
}

.section-head.centered .section-sub {
  margin-left: auto;
  margin-right: auto;
}

.biz-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.biz {
  display: flex;
  flex-direction: column;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.biz:hover {
  transform: translateY(-6px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
}

.biz-icon {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid var(--line-strong);
  color: var(--cyan);
  margin-bottom: 20px;
}

.biz-icon svg {
  width: 28px;
  height: 28px;
}

.biz h3 {
  margin: 0 0 8px;
  font-size: 22px;
  font-weight: 800;
}

.biz p {
  color: var(--muted);
  margin: 0 0 14px;
  font-size: 14px;
}

.biz-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.biz-tags span {
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px;
  color: #cbd5e1;
}

.biz-more {
  margin-top: auto;
  color: var(--cyan);
  font-size: 14px;
  font-weight: 600;
}

.card-more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 16px;
  color: var(--cyan);
  font-size: 14px;
  font-weight: 600;
  transition: color 0.2s ease;
}

.card-img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: 12px;
  margin-bottom: 16px;
  border: 1px solid var(--line);
}

.card-more:hover {
  color: #fff;
}

.policy-link,
.compare-link,
.timeline-link {
  color: var(--cyan);
  border-bottom: 1px solid rgba(56, 189, 248, 0.35);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.policy-link:hover,
.compare-link:hover,
.timeline-link:hover {
  color: #fff;
  border-color: #fff;
}

/* 页脚相关链接 */
.footer-links {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 34px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.footer-links-label {
  color: var(--text);
}

.footer-links a {
  color: var(--muted);
}

.footer-links a:hover {
  color: var(--cyan);
}

.footer-links > span:not(.footer-links-label) {
  opacity: 0.72;
  cursor: default;
}

/* 移动端：隐藏顶部工具栏，恢复原高度 */
@media (max-width: 960px) {
  .quick-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .nav-item {
    width: 100%;
  }

  .nav-link {
    width: 100%;
    padding: 14px 0;
    justify-content: space-between;
  }

  .nav-caret {
    display: none;
  }

  .dropdown {
    position: static;
    min-width: 0;
    padding: 0 0 6px 16px;
    background: transparent;
    border: 0;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .dropdown a {
    padding: 8px 0;
  }
}

@media (max-width: 640px) {
  .quick-panel {
    grid-template-columns: 1fr;
  }

  .quick-intro {
    padding-right: 0;
    padding-bottom: 16px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

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

/* ===== 新闻详情页 & 404 ===== */
.article-section {
  padding: 170px 0 80px;
}

.article-container {
  max-width: 820px;
}

.article-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--cyan);
  font-size: 14px;
  margin-bottom: 28px;
  transition: color 0.2s ease;
}

.article-back:hover {
  color: #fff;
}

.article {
  padding: 44px 48px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
}

.article-header .section-kicker {
  margin-bottom: 16px;
}

.article-header h1 {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.2;
  margin: 0 0 16px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.article-date {
  color: var(--muted);
  font-size: 14px;
}

.article-role {
  color: var(--cyan);
  font-size: 16px;
  margin: 0 0 8px;
}

.article-body {
  margin-top: 28px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  color: #cbd5e1;
  font-size: 16px;
  line-height: 1.85;
}

.article-body h2,
.article-body h3,
.article-body h4 {
  color: #e6edf7;
  margin: 1.4em 0 0.6em;
  line-height: 1.3;
}

.article-body h2 {
  font-size: 24px;
}

.article-body h3 {
  font-size: 20px;
}

.article-body p {
  margin: 0 0 1em;
}

.article-body a {
  color: var(--cyan);
}

.article-body img {
  border-radius: 14px;
  margin: 1em 0;
}

.article-body ul,
.article-body ol {
  padding-left: 1.4em;
  margin: 0 0 1em;
}

.article-body blockquote {
  margin: 1em 0;
  padding: 12px 18px;
  border-left: 3px solid var(--cyan);
  background: rgba(56, 189, 248, 0.06);
  border-radius: 8px;
}

.article-body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: rgba(148, 163, 184, 0.12);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.9em;
}

.empty {
  padding: 30px;
  text-align: center;
  color: var(--muted);
  border: 1px dashed var(--line);
  border-radius: 14px;
}

.notfound-section {
  padding: 170px 0 90px;
}

.notfound-container {
  text-align: center;
}

.notfound-container h1 {
  font-size: clamp(80px, 16vw, 160px);
  line-height: 1;
  margin: 16px 0 8px;
  font-weight: 800;
  background: linear-gradient(120deg, #7dd3fc, #818cf8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.notfound-container p {
  color: var(--muted);
  margin: 0 0 30px;
  font-size: 17px;
}

@media (max-width: 640px) {
  .article-section {
    padding-top: 130px;
  }

  .article {
    padding: 28px 22px;
  }
}

/* ===== 多分辨率屏幕适配 ===== */

/* 删掉顶部工具栏和公告条后，文章页顶部间距修正 */
.article-section {
  padding-top: 110px;
}

/* 超大屏：轮播图不要过高 */
@media (min-width: 1600px) {
  .carousel-hero {
    min-height: 80vh;
  }
}

/* 平板（641-960px）*/
@media (min-width: 641px) and (max-width: 960px) {
  .carousel-hero {
    min-height: 82vh;
  }

  .section {
    padding: 88px 0;
  }
}

/* 手机（<640px）*/
@media (max-width: 640px) {
  .carousel-hero {
    min-height: 68vh;
  }

  .article-section {
    padding-top: 96px;
  }

  .section {
    padding: 58px 0;
  }

  .section-head {
    margin-bottom: 34px;
  }

  .section h2,
  .split-copy h2 {
    font-size: 26px;
  }

  .section-sub {
    font-size: 15px;
  }

  .split {
    gap: 30px;
  }

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

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

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

  .person-photo {
    width: 100%;
    height: 180px;
  }

  .contact-panel {
    padding: 26px 20px;
  }

  .article {
    padding: 24px 18px;
  }

  .compare-table {
    font-size: 13px;
  }
}