/* DEEP AZURE CLOUD — 深蓝云科技 */
:root {
  --bg-deep: #050b14;
  --bg-card: rgba(12, 24, 42, 0.72);
  --azure: #3eb8f0;
  --azure-soft: rgba(62, 184, 240, 0.15);
  --logo-panel: #f0f2f5;
  --logo-panel-top: #fcfdff;
  --logo-panel-bot: #e4e9ef;
  --logo-shadow: 0 10px 36px rgba(0, 0, 0, 0.28), 0 0 0 1px rgba(255, 255, 255, 0.55) inset;
  --text: #e8f4fc;
  --text-muted: #94a8bc;
  --border: rgba(62, 184, 240, 0.22);
  --font-sans: "DM Sans", "Noto Sans SC", system-ui, sans-serif;
  --radius: 14px;
  --max: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg-deep);
  background-image:
    radial-gradient(ellipse 120% 80% at 50% -20%, rgba(62, 184, 240, 0.18), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(30, 90, 140, 0.12), transparent);
  min-height: 100vh;
}

a {
  color: var(--azure);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0.65rem 1.5rem;
  background: rgba(5, 11, 20, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  line-height: 0;
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.logo-link:hover {
  text-decoration: none;
  opacity: 0.88;
}

.logo-link:focus-visible {
  outline: 2px solid var(--azure);
  outline-offset: 3px;
}

.logo-img {
  display: block;
  height: clamp(46px, 9vw, 64px);
  width: auto;
  max-width: min(72vw, 380px);
  object-fit: contain;
  object-position: left center;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.35rem;
  font-size: 0.88rem;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--azure);
  text-decoration: none;
}

/* Hero */
.hero {
  padding-top: 6.25rem;
  padding-bottom: 2.5rem;
}

.hero-visual {
  position: relative;
  width: 100%;
  max-height: min(58vh, 580px);
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.hero-visual img {
  width: 100%;
  height: min(58vh, 580px);
  object-fit: cover;
  object-position: center 35%;
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(
      ellipse 90% 75% at 50% 48%,
      rgba(5, 11, 20, 0.55) 0%,
      rgba(5, 11, 20, 0.28) 52%,
      transparent 72%
    ),
    linear-gradient(
      180deg,
      rgba(5, 11, 20, 0.45) 0%,
      rgba(5, 11, 20, 0.35) 42%,
      rgba(5, 11, 20, 0.72) 88%,
      var(--bg-deep) 100%
    );
  pointer-events: none;
}

.hero-copy {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 2;
  width: min(100%, var(--max));
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem 1.5rem;
  box-sizing: border-box;
}

.hero-legal {
  margin: 0 0 0.5rem;
  font-size: clamp(0.62rem, 1.5vw, 0.72rem);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(232, 244, 252, 0.88);
  text-wrap: balance;
  max-width: 36em;
}

.hero-copy h1 {
  margin: 0 0 0.85rem;
  font-size: clamp(2rem, 5.5vw, 2.85rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.2;
  color: var(--text);
  text-shadow: 0 1px 24px rgba(5, 11, 20, 0.45);
}

.hero-tagline {
  margin: 0;
  font-size: clamp(0.95rem, 2.1vw, 1.08rem);
  color: var(--text-muted);
  max-width: min(40em, 92vw);
}

.hero-tagline .cn {
  display: block;
  color: var(--text);
  font-weight: 500;
  line-height: 1.65;
  text-wrap: balance;
  text-shadow: 0 1px 18px rgba(5, 11, 20, 0.4);
}

.hero-tagline .en {
  display: block;
  margin-top: 0.65rem;
  font-size: clamp(0.82rem, 1.85vw, 0.95rem);
  color: rgba(148, 168, 188, 0.98);
  font-weight: 400;
  letter-spacing: 0.01em;
  text-wrap: balance;
  text-shadow: 0 1px 14px rgba(5, 11, 20, 0.45);
}

/* Sections */
main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

section {
  padding: 3.5rem 0;
  border-top: 1px solid var(--border);
}

section:first-of-type {
  border-top: none;
  padding-top: 1rem;
}

.section-title {
  margin: 0 0 1.25rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--azure);
}

.section-heading {
  margin: 0 0 1.5rem;
  font-size: 1.5rem;
  font-weight: 700;
}

.prose {
  color: var(--text-muted);
  max-width: 52em;
}

.prose p {
  margin: 0 0 1rem;
}

.prose p:last-child {
  margin-bottom: 0;
}

.about-brand {
  display: grid;
  grid-template-columns: minmax(0, 420px) minmax(0, 1fr);
  gap: 2.25rem 3rem;
  align-items: start;
}

.about-brand-logo {
  margin: 0;
}

.about-brand-logo img {
  width: 100%;
  height: auto;
}

.about-prose {
  min-width: 0;
}

.about-lead {
  color: var(--text);
  font-weight: 600;
  font-size: 1.08rem;
  line-height: 1.55;
}

/* Cards grid */
.grid-3 {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem 1.5rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.card:hover {
  border-color: rgba(62, 184, 240, 0.45);
  box-shadow: 0 0 0 1px var(--azure-soft);
}

.card h3 {
  margin: 0 0 0.6rem;
  font-size: 1.05rem;
  color: var(--text);
}

.card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Contact strip — 单行排列 */
.contact-strip {
  background: var(--azure-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-wrap: nowrap;
  align-items: flex-start;
  gap: 1.25rem 1.35rem;
}

.contact-strip > div {
  flex: 1 1 0;
  min-width: 0;
}

.contact-strip dt {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--azure);
  margin-bottom: 0.35rem;
}

.contact-strip dd {
  margin: 0;
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.5;
}

.contact-emails,
.contact-phones {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.contact-emails a,
.contact-phones a {
  display: block;
  max-width: 100%;
  overflow-wrap: anywhere;
  word-break: break-word;
  font-size: 0.85rem;
  line-height: 1.45;
}

/* Footer */
.site-footer {
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.site-footer strong {
  color: var(--text);
  font-weight: 600;
}

.footer-logo-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 1.35rem;
}

.footer-logo {
  height: clamp(48px, 10vw, 72px);
  width: auto;
  max-width: min(90vw, 420px);
  object-fit: contain;
}

@media (max-width: 720px) {
  .about-brand {
    grid-template-columns: 1fr;
  }

  .about-brand-logo {
    max-width: min(100%, 400px);
    margin: 0 auto;
  }

  .contact-strip {
    flex-wrap: wrap;
  }

  .contact-strip > div {
    flex: 1 1 calc(50% - 0.75rem);
  }
}

@media (max-width: 640px) {
  .nav {
    justify-content: flex-end;
  }

  .logo-img {
    height: clamp(42px, 11vw, 54px);
    max-width: min(70vw, 320px);
  }
}