:root {
  --navy: #173f5f;
  --navy-dark: #102f49;
  --navy-deep: #0b273f;
  --blue: #1f78a6;
  --cyan: #4ba7c8;
  --ink: #172536;
  --ink-secondary: #3a4a5c;
  --muted: #6d7784;
  --soft: #f5f7f9;
  --line: #e2e6ea;
  --white: #ffffff;

  --font-sans: "PingFang HK", "Microsoft YaHei", "SimHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --content-max: 1200px;
  --nav-height: 64px;
  --section-pad: clamp(40px, 4.5vw, 60px);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { font-family: var(--font-sans); color: var(--ink); background: var(--white); line-height: 1.75; overflow-x: hidden; font-size: 16px; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; }

.en { display: none; }
body.lang-en .tc { display: none; }
body.lang-en .en { display: block; }
body.lang-en span.en { display: inline; }
body.lang-en li.en { display: list-item; }
body.lang-en dd.en { display: block; }
body.lang-en dt.en { display: block; }
body.lang-en em.en { display: inline; }

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
  transition-delay: var(--delay, 0s);
}
.reveal.visible { opacity: 1; transform: none; }

/* ── Navigation ── */

.navbar {
  position: fixed; top: 0; left: 0; width: 100%; height: var(--nav-height);
  z-index: 1000; display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(24px, 4vw, 56px);
  background: transparent;
  transition: background 0.35s, box-shadow 0.35s;
}
.navbar.scrolled {
  background: rgba(11,39,63,0.94);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 1px 12px rgba(0,0,0,0.15);
}

.brand-logo-wrap { display: flex; align-items: center; gap: 10px; color: #fff; font-size: 1.1rem; font-weight: 800; letter-spacing: 0.03em; }
.brand-logo-wrap svg { width: 34px; height: 34px; flex-shrink: 0; }

.nav-right { display: flex; align-items: center; gap: 32px; }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a { color: rgba(255,255,255,0.8); font-size: 0.95rem; font-weight: 600; transition: color 0.2s; }
.nav-links a:hover { color: #fff; }

.lang-switch {
  background: none; border: 1px solid rgba(255,255,255,0.3); color: rgba(255,255,255,0.8);
  padding: 6px 16px; font-size: 0.85rem; font-family: var(--font-sans); font-weight: 600;
  cursor: pointer; transition: border-color 0.2s, color 0.2s; letter-spacing: 0.02em;
}
.lang-switch:hover { border-color: rgba(255,255,255,0.6); color: #fff; }

/* ── Hero ── */

.hero-section {
  position: relative; width: 100%; height: 100vh; min-height: 620px; max-height: 960px;
  display: flex; align-items: center; overflow: hidden; background: var(--navy-deep);
}
.hero-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 30%; z-index: 1; }
.hero-overlay {
  position: absolute; inset: 0; z-index: 2; pointer-events: none;
  background:
    linear-gradient(125deg, rgba(11,39,63,0.93) 0%, rgba(11,39,63,0.7) 35%, rgba(11,39,63,0.2) 70%, transparent 100%),
    linear-gradient(to bottom, rgba(11,39,63,0.25) 0%, transparent 40%, rgba(11,39,63,0.45) 100%);
}
.hero-geometric-mask { position: absolute; z-index: 3; pointer-events: none; }
.mask-a { right: 0; top: 0; width: 50%; height: 100%; background: rgba(71,132,156,0.22); clip-path: polygon(32% 0%,100% 0%,100% 100%,12% 100%); }
.mask-b { right: 16%; top: 28%; width: 20%; height: 46%; background: rgba(44,107,137,0.18); clip-path: polygon(36% 0%,100% 0%,64% 100%,0% 100%); }

.hero-content { position: relative; z-index: 10; padding: 0 clamp(24px, 5vw, 56px); max-width: 680px; color: #fff; }
.hero-tagline {
  font-size: 1rem; letter-spacing: 0.18em; color: rgba(255,255,255,0.5);
  margin-bottom: 24px; opacity: 0; animation: h-in 0.7s 0.2s forwards;
}
.hero-title {
  font-size: clamp(2.6rem, 5.5vw, 4rem); font-weight: 800; line-height: 1.08; margin-bottom: 14px;
  min-height: 2.2em;
}
.hero-title span { display: block; font-weight: 300; color: rgba(255,255,255,0.88); }
.hero-title strong { display: block; font-weight: 800; }
.hero-subtitle {
  font-size: clamp(1rem, 1.8vw, 1.25rem); color: var(--cyan); letter-spacing: 0.03em;
  margin-bottom: 24px; opacity: 0;
}
.hero-lead {
  font-size: clamp(1rem, 1.5vw, 1.1rem); color: rgba(255,255,255,0.65); line-height: 1.85;
  margin-bottom: 40px; max-width: 540px; opacity: 0;
}
.hero-actions { opacity: 0; }
.cta-button {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--blue); color: #fff; padding: 14px 34px;
  font-size: 1rem; font-weight: 700; letter-spacing: 0.02em;
  transition: background 0.25s, box-shadow 0.25s;
  box-shadow: 0 4px 16px rgba(31,120,166,0.25);
}
.cta-button:hover { background: #2488ba; box-shadow: 0 6px 24px rgba(31,120,166,0.35); }
.cta-button svg { width: 18px; height: 18px; transition: transform 0.2s; }
.cta-button:hover svg { transform: translateX(3px); }

.hero-scroll-hint {
  position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%); z-index: 10;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  color: rgba(255,255,255,0.3); font-size: 0.75rem; letter-spacing: 0.12em;
  animation: scroll-b 2s infinite;
}
.hero-scroll-hint::after { content: ""; width: 1px; height: 24px; background: linear-gradient(to bottom, rgba(255,255,255,0.3), transparent); }

@keyframes h-in { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes scroll-b { 0%,100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(6px); } }

/* ── Sections ── */

.section-block { padding: var(--section-pad) clamp(24px, 4vw, 56px); }
.section-block.bg-white { background: var(--white); }
.section-block.bg-dark { background: var(--navy-deep); color: #fff; }
.section-inner { max-width: var(--content-max); margin: 0 auto; }

.section-title { margin-bottom: 28px; }
#services .section-title { margin-bottom: 40px; }
.section-title .category {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.85rem; font-weight: 700; color: var(--blue); letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 8px;
}
.section-title .category::before { content: ""; width: 2px; height: 14px; background: var(--blue); }
.section-title h2 { font-size: clamp(2.1rem, 4vw, 3rem); color: var(--ink); letter-spacing: -0.02em; }
.section-title h2 span { font-weight: 300; color: var(--muted); }
.section-title h2 strong { font-weight: 800; }
.bg-dark .section-title h2 { color: #fff; }
.bg-dark .section-title h2 span { color: rgba(255,255,255,0.55); }
.bg-dark .section-title .category { color: var(--cyan); }
.bg-dark .section-title .category::before { background: var(--cyan); }

/* ── About ── */

.about-intro-grid {
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 44px; align-items: stretch;
}
.about-intro-grid .section-title { text-align: left; margin-bottom: 28px; }
.about-intro-grid .about-text p { font-size: 1.05rem; color: var(--ink-secondary); line-height: 1.9; margin-bottom: 18px; }
.about-photo { overflow: hidden; }
.about-photo img { width: 100%; height: 100%; object-fit: cover; }

.about-continued { padding-top: clamp(24px, 3vw, 36px); padding-bottom: clamp(32px, 4vw, 48px); }

.two-text-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; }
.two-text-columns h3 { font-size: 1.4rem; color: var(--ink); margin-bottom: 12px; }
.two-text-columns p { font-size: 1.08rem; color: var(--ink-secondary); line-height: 1.85; }

.vm-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 44px; margin-top: 36px;
  padding-top: 36px; border-top: 1px solid var(--line);
}
.vm-grid h3 { font-size: 1.4rem; color: var(--ink); margin-bottom: 12px; }
.vm-grid p { font-size: 1.08rem; color: var(--ink-secondary); line-height: 1.85; }
.vm-grid ul { font-size: 1.08rem; color: var(--ink-secondary); line-height: 1.85; }
.vm-grid ul li { position: relative; padding-left: 18px; margin-bottom: 8px; }
.vm-grid ul li::before { content: ""; position: absolute; left: 0; top: 0.65em; width: 7px; height: 1px; background: var(--ink); }

/* ── Stat Band ── */

.stat-band {
  background: var(--navy-deep); padding: clamp(44px, 5vw, 68px) clamp(24px, 4vw, 56px);
}
.stat-band-inner {
  max-width: var(--content-max); margin: 0 auto;
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px;
}
.stat-band-item { text-align: center; color: #fff; }
.stat-band-item strong {
  display: block; font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 800; line-height: 1; margin-bottom: 10px;
}
.stat-band-item strong em { font-style: normal; font-size: 0.55em; font-weight: 600; }
.stat-band-item span { display: block; font-size: 0.9rem; color: rgba(255,255,255,0.55); line-height: 1.35; }

/* ── Services ── */

#services { margin-top: clamp(-36px, -2.5vw, 0px); padding-top: clamp(0px, 2vw, 24px); }
.service-intro-text { max-width: 760px; margin: -12px auto 36px; text-align: center; color: var(--ink-secondary); font-size: 1.05rem; line-height: 1.85; }
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); }
.service-card { background: var(--white); padding: 36px 32px; transition: background 0.25s; }
.service-card:hover { background: var(--soft); }
.service-card .service-icon-wrap { width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; color: var(--navy-deep); margin-bottom: 20px; }
.service-card .service-icon-wrap svg { width: 26px; height: 26px; }
.service-card h3 { font-size: 1.25rem; color: var(--ink); margin-bottom: 12px; }
.service-card p { font-size: 0.98rem; color: var(--muted); line-height: 1.75; }

.service-footer-img {
  width: 100%; height: clamp(200px, 24vw, 320px); overflow: hidden;
}
.service-footer-img img { width: 100%; height: 100%; object-fit: cover; object-position: center; }

/* ── Tech Stack ── */

.fleet-layout { display: grid; grid-template-columns: 0.42fr 0.58fr; gap: 56px; align-items: stretch; }
.fleet-left { display: flex; flex-direction: column; }
.fleet-copy p { font-size: 1.05rem; line-height: 1.9; color: rgba(255,255,255,0.68); margin-bottom: 18px; }
.fleet-left blockquote {
  margin-top: auto; padding: 28px 0 0; border-top: 1px solid rgba(255,255,255,0.1);
  color: #fff; font-size: 1.2rem; font-weight: 600; line-height: 1.65; letter-spacing: 0.01em;
}
.fleet-left blockquote svg { width: 22px; height: 22px; fill: rgba(255,255,255,0.3); margin-bottom: 12px; display: block; }
.fleet-list { display: flex; flex-direction: column; gap: 0; }
.fleet-list article { padding: 28px 0; border-bottom: 1px solid rgba(255,255,255,0.07); }
.fleet-list article:first-child { padding-top: 0; }
.fleet-list article:last-child { border-bottom: none; padding-bottom: 0; }
.fleet-list article h3 { display: flex; align-items: baseline; gap: 12px; font-size: 1.3rem; color: #fff; margin-bottom: 10px; }
.fleet-list article h3 span { font-size: 0.95rem; color: rgba(255,255,255,0.35); font-weight: 700; flex-shrink: 0; }
.fleet-list article p { color: rgba(255,255,255,0.55); font-size: 1rem; line-height: 1.8; }

/* ── Global ── */

.global-hero-band {
  position: relative; overflow: hidden; height: clamp(220px, 30vw, 340px);
  background: var(--navy-deep);
}
.global-hero-band img {
  position: absolute; right: 0; top: 0; width: 55%; height: 100%; object-fit: cover;
}
.global-hero-band::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(to right, var(--navy-deep) 40%, rgba(11,39,63,0.4) 70%, rgba(11,39,63,0.1) 100%);
}
.global-hero-text {
  position: relative; z-index: 2; padding: clamp(36px, 5vw, 56px) clamp(24px, 4vw, 56px);
  max-width: var(--content-max); margin: 0 auto; color: #fff;
  display: flex; flex-direction: column; justify-content: center; height: 100%;
}
.global-hero-text .category {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.85rem; font-weight: 700; color: var(--cyan); letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 10px;
}
.global-hero-text .category::before { content: ""; width: 2px; height: 14px; background: var(--cyan); }
.global-hero-text h2 { font-size: clamp(1.9rem, 3.5vw, 2.6rem); font-weight: 800; }
.global-hero-text h2 span { font-weight: 300; color: rgba(255,255,255,0.55); }
.global-hero-text p { margin-top: 18px; max-width: 500px; font-size: 1.02rem; color: rgba(255,255,255,0.62); line-height: 1.8; }

.global-map-band {
  background: #061d36; padding: 0; overflow: hidden;
}
.global-map-band img { width: 100%; height: clamp(280px, 36vw, 460px); display: block; object-fit: cover; object-position: center 35%; }

.global-stats {
  padding: var(--section-pad) clamp(24px, 4vw, 56px); background: var(--white);
}
.global-stats-inner {
  max-width: var(--content-max); margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: stretch;
}
.global-stats-inner h3 { font-size: 1.35rem; color: var(--ink); margin-bottom: 20px; }

.coverage { display: flex; flex-direction: column; }
.coverage-grid {
  display: grid;
  grid-template-columns: repeat(6, 50px);
  grid-template-rows: auto auto;
  gap: 16px 8px;
  justify-content: start;
  flex: 1;
  align-content: start;
}
.coverage-grid > div { grid-column: span 2; }
.coverage-grid > div:nth-child(4) { grid-column: 2 / span 2; }
.coverage-grid > div:nth-child(5) { grid-column: 4 / span 2; }
.coverage-grid > div {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  width: 100px; height: 100px; border: 1px solid var(--line); border-radius: 50%; text-align: center;
  justify-self: center;
}
.coverage-grid strong { display: block; font-size: 1.4rem; font-weight: 800; color: var(--navy-deep); line-height: 1.1; }
.coverage-grid span { display: block; margin-top: 3px; font-size: 0.8rem; color: var(--muted); line-height: 1.2; }

.efficiency { display: flex; flex-direction: column; }
.efficiency p { font-size: 1.02rem; color: var(--ink-secondary); line-height: 1.8; }
.efficiency-intro { color: var(--ink) !important; font-weight: 600 !important; margin-bottom: 16px; }
.efficiency ul { margin-top: auto; }
.efficiency li { position: relative; padding-left: 16px; margin-bottom: 10px; font-size: 1rem; color: var(--muted); line-height: 1.7; }
.efficiency li:last-child { margin-bottom: 0; }
.efficiency li::before { content: ""; position: absolute; left: 0; top: 0.65em; width: 6px; height: 1px; background: var(--muted); }

/* ── Process ── */

.process-section {
  display: grid; grid-template-columns: 1fr 0.45fr; background: var(--navy-deep);
}
.process-left {
  padding: clamp(52px, 6vw, 84px) clamp(24px, 4vw, 56px);
}
.process-left-inner { max-width: 700px; margin: 0 auto; }
.process-left .section-title { margin-bottom: 28px; }
.process-section .section-title h2 { color: #fff; }
.process-section .section-title h2 span { color: rgba(255,255,255,0.55); }
.process-section .section-title .category { color: var(--cyan); }
.process-section .section-title .category::before { background: var(--cyan); }
.process-intro-text {
  font-size: 1.02rem; color: rgba(255,255,255,0.58); line-height: 1.85; margin-bottom: 40px;
}
.process-steps { display: flex; flex-direction: column; gap: 0; }
.process-step-row {
  display: grid; grid-template-columns: 56px 1fr; gap: 22px; align-items: start;
  padding: 26px 0; border-bottom: 1px solid rgba(255,255,255,0.08);
}
.process-step-row:last-child { border-bottom: none; }
.process-step-row .process-icon-wrap {
  width: 56px; height: 56px; border: 1px solid rgba(255,255,255,0.15); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; color: var(--cyan);
}
.process-step-row .process-icon-wrap svg { width: 24px; height: 24px; }
.process-step-row h3 { font-size: 1.25rem; color: #fff; margin-bottom: 8px; }
.process-step-row p { font-size: 0.98rem; color: rgba(255,255,255,0.52); line-height: 1.7; }
.process-photo { overflow: hidden; }
.process-photo img { width: 100%; height: 100%; object-fit: cover; }

/* ── Contact ── */

.contact-copy { max-width: 800px; margin-bottom: 48px; }
.contact-copy p { font-size: 1.05rem; color: var(--ink-secondary); line-height: 1.9; margin-bottom: 18px; }
.contact-info-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border: 1px solid var(--line); }
.contact-info { padding: 36px; }
.contact-info:first-child { border-right: 1px solid var(--line); }
.contact-info h3 { font-size: 1.3rem; color: var(--ink); margin-bottom: 16px; }
.contact-info dl { margin: 0; }
.contact-info dt { font-weight: 700; color: var(--ink); font-size: 0.95rem; margin-top: 14px; }
.contact-info dt:first-of-type { margin-top: 0; }
.contact-info dd { margin: 3px 0 0; color: var(--ink-secondary); font-size: 0.98rem; }
.contact-info ul li { margin-bottom: 8px; color: var(--ink-secondary); font-size: 0.98rem; }
.contact-info ul li b { color: var(--ink); }

/* ── Partner Band ── */

.partner-section {
  background: var(--navy-deep); padding: clamp(52px, 6vw, 76px) clamp(24px, 4vw, 56px);
  text-align: center; color: #fff;
}
.partner-section-inner { max-width: var(--content-max); margin: 0 auto; }
.partner-section h3 { color: #fff; font-size: 1.3rem; margin-bottom: 12px; }
.partner-section > .partner-section-inner > p { color: rgba(255,255,255,0.55); max-width: 560px; margin: 0 auto 36px; font-size: 1rem; }
.partner-logos { display: flex; justify-content: center; flex-wrap: wrap; gap: 24px; }
.partner-logos div {
  padding: 12px 24px; border: 1px solid rgba(255,255,255,0.15);
  font-weight: 700; color: rgba(255,255,255,0.6); font-size: 0.92rem; letter-spacing: 0.04em;
  transition: border-color 0.2s, color 0.2s;
}
.partner-logos div:hover { border-color: rgba(255,255,255,0.4); color: rgba(255,255,255,0.85); }

/* ── Footer ── */

.site-footer { background: var(--navy-deep); border-top: 1px solid rgba(255,255,255,0.05); padding: 32px clamp(24px, 4vw, 56px); }
.footer-inner { max-width: var(--content-max); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: rgba(255,255,255,0.5); font-weight: 700; font-size: 0.95rem; }
.footer-brand svg { width: 26px; height: 26px; opacity: 0.4; }
.footer-copy { color: rgba(255,255,255,0.3); font-size: 0.85rem; }

/* ── Responsive ── */

@media (max-width: 960px) {
  .about-intro-grid { grid-template-columns: 1fr; }
  .about-photo { height: 260px; }
  .vm-grid, .two-text-columns { grid-template-columns: 1fr; }
  .fleet-layout { grid-template-columns: 1fr; }
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .global-stats-inner { grid-template-columns: 1fr; }
  .global-hero-band img { width: 100%; opacity: 0.3; }
  .global-hero-band::after { background: linear-gradient(to bottom, rgba(11,39,63,0.7), rgba(11,39,63,0.9)); }
  .process-section { grid-template-columns: 1fr; }
  .process-photo { height: 300px; }
  .contact-info-row { grid-template-columns: 1fr; }
  .contact-info:first-child { border-right: none; border-bottom: 1px solid var(--line); }
  .stat-band-inner { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .service-grid { grid-template-columns: 1fr; }
  .coverage-grid > div { width: 88px; height: 88px; }
  .coverage-grid strong { font-size: 1.2rem; }
  .footer-inner { flex-direction: column; text-align: center; }
  .stat-band-inner { grid-template-columns: repeat(2, 1fr); }
  .stat-band-item:last-child { grid-column: 1 / -1; }
  .hero-section { min-height: 100svh; }
  .process-left-inner { margin-left: 0; }
}