:root {
  --bg: #06111f;
  --bg-soft: #0e1c2f;
  --surface: rgba(255, 255, 255, 0.08);
  --surface-strong: rgba(255, 255, 255, 0.14);
  --text: #f4f7fb;
  --text-muted: #9db0c7;
  --accent: #3ec7ff;
  --accent-strong: #66a7ff;
  --border: rgba(255, 255, 255, 0.14);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.24);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(62, 199, 255, 0.18), transparent 28%),
    linear-gradient(135deg, var(--bg), #081926 65%, #0d2036);
  line-height: 1.7;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 5vw;
  backdrop-filter: blur(18px);
  background: rgba(4, 12, 22, 0.72);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-logo {
  display: block;
  height: 44px;
  width: 44px;
  object-fit: cover;
  border-radius: 6px;
}

.site-nav {
  display: flex;
  gap: 1.4rem;
}

.site-nav a {
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--text);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  padding: 0.35rem;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  margin: 4px 0;
  background: var(--text);
}

main {
  padding: 0 5vw 4rem;
}

.hero,
.page-hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2rem;
  align-items: center;
  padding: 4rem 0 2.5rem;
}

.hero-copy,
.page-hero-copy {
  max-width: 660px;
}

.eyebrow {
  margin: 0 0 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0 0 0.7rem;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.3rem);
  line-height: 1.2;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

p {
  margin: 0 0 1rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin: 1.3rem 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.2rem;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.btn-primary {
  color: #00111f;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  box-shadow: 0 12px 35px rgba(62, 199, 255, 0.25);
}

.btn-secondary {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
}

.hero-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.hero-highlights li {
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-size: 0.95rem;
}

.hero-visual img,
.page-hero-visual img,
.showcase-card img {
  width: min(100%, 560px);
  margin-left: auto;
  border-radius: 24px;
  box-shadow: var(--shadow);
  object-fit: cover;
  height: 100%;
}

.section {
  padding: 3rem 0 0;
}

.section-heading {
  margin-bottom: 1.4rem;
}

.keyword-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.keyword-card {
  background: linear-gradient(135deg, rgba(62, 199, 255, 0.12), rgba(255, 255, 255, 0.06));
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.3rem;
  box-shadow: var(--shadow);
}

.keyword-card h3 {
  color: var(--text);
  margin-bottom: 0.6rem;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr;
  gap: 1rem;
}

.about-card,
.tech-card,
.showcase-card,
.case-card,
.info-card,
.contact-form-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.3rem;
  box-shadow: var(--shadow);
}

.large {
  min-height: 220px;
}

.stat-card {
  display: grid;
  place-items: center;
  text-align: center;
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent);
}

.stat-label {
  color: var(--text-muted);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.tech-card h3 {
  color: var(--text);
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.showcase-card {
  padding: 0;
  overflow: hidden;
}

.showcase-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  margin: 0;
  border-radius: 20px 20px 0 0;
}

.showcase-body {
  padding: 1rem 1.2rem 1.25rem;
}

.case-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
}

.case-card {
  overflow: hidden;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(260px, 360px) 1fr;
  align-items: stretch;
}

.case-card img {
  width: 100%;
  height: 100%;
  min-height: 260px;
  object-fit: cover;
  display: block;
}

.case-body {
  padding: 1.4rem 1.4rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.case-title-row {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.7rem;
  flex-wrap: wrap;
}

.case-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: rgba(62, 199, 255, 0.16);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.case-card h3 {
  margin: 0;
}

.case-card p {
  margin-bottom: 0.7rem;
}

.case-card span {
  display: inline-block;
  margin-top: 0.4rem;
  color: var(--accent);
  font-size: 0.9rem;
}

@media (max-width: 900px) {
  .case-card {
    grid-template-columns: 1fr;
  }

  .case-card img {
    min-height: 220px;
  }
}

.contact-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.contact-info {
  display: grid;
  gap: 1rem;
}

.contact-form {
  display: grid;
  gap: 0.8rem;
}

.contact-form label {
  display: grid;
  gap: 0.4rem;
  color: var(--text);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.site-footer {
  padding: 2rem 5vw 3rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  text-align: center;
}

@media (max-width: 900px) {
  .about-grid,
  .tech-grid,
  .showcase-grid,
  .keyword-grid,
  .case-grid,
  .contact-section,
  .hero,
  .page-hero {
    grid-template-columns: 1fr;
  }

  .hero-visual img,
  .page-hero-visual img {
    margin: 0 auto;
  }
}

@media (max-width: 720px) {
  .site-header {
    flex-wrap: wrap;
    gap: 0.8rem;
  }

  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    padding-top: 0.4rem;
  }

  .site-nav.open {
    display: flex;
  }

  main {
    padding: 0 1rem 3rem;
  }

  .hero,
  .page-hero {
    padding-top: 2rem;
  }
}