:root {
  --bg: #061018;
  --bg-soft: #0c1a24;
  --ink: #e8f2f7;
  --muted: #9bb0bd;
  --line: rgba(125, 211, 230, 0.22);
  --accent: #2fd3c8;
  --accent-2: #4ea1ff;
  --danger-soft: rgba(47, 211, 200, 0.12);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  --radius: 18px;
  --container: min(1120px, calc(100% - 2rem));
  --font-display: "Orbitron", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(78, 161, 255, 0.18), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(47, 211, 200, 0.14), transparent 50%),
    linear-gradient(180deg, #040b11 0%, var(--bg) 40%, #07141d 100%);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

h1,
h2,
h3,
.brand-name,
.hero-brand {
  font-family: var(--font-display);
  letter-spacing: 0.04em;
}

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

.container {
  width: var(--container);
  margin-inline: auto;
}

.bg-grid,
.bg-orb {
  pointer-events: none;
  position: fixed;
  inset: auto;
  z-index: 0;
}

.bg-grid {
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at center, black 30%, transparent 80%);
  opacity: 0.5;
}

.bg-orb {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.35;
  animation: float 10s ease-in-out infinite;
}

.bg-orb-a {
  top: 18%;
  left: -80px;
  background: rgba(47, 211, 200, 0.35);
}

.bg-orb-b {
  top: 55%;
  right: -100px;
  background: rgba(78, 161, 255, 0.28);
  animation-delay: -4s;
}

#app {
  position: relative;
  z-index: 1;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  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(6, 16, 24, 0.82);
  border-bottom-color: var(--line);
  backdrop-filter: blur(14px);
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  color: #041018;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 24px rgba(47, 211, 200, 0.35);
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
}

.nav {
  display: none;
  gap: 1.4rem;
}

.nav a {
  color: var(--muted);
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

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

.nav-toggle {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  display: grid;
  place-content: center;
  gap: 6px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
}

.nav.open {
  display: flex;
  position: absolute;
  top: 72px;
  left: 1rem;
  right: 1rem;
  flex-direction: column;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(8, 18, 26, 0.96);
  box-shadow: var(--shadow);
}

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  padding: 7.5rem 0 4.5rem;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.05);
  animation: kenburns 18s ease-in-out infinite alternate;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(4, 11, 17, 0.35) 0%, rgba(4, 11, 17, 0.55) 42%, rgba(4, 11, 17, 0.92) 100%),
    linear-gradient(90deg, rgba(4, 11, 17, 0.7) 0%, rgba(4, 11, 17, 0.2) 60%, rgba(4, 11, 17, 0.55) 100%);
}

.hero-content {
  max-width: 760px;
}

.hero-brand {
  font-size: clamp(2.4rem, 8vw, 4.6rem);
  font-weight: 700;
  line-height: 1.05;
  margin-bottom: 0.8rem;
  background: linear-gradient(120deg, #ffffff 10%, var(--accent) 55%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-title {
  font-size: clamp(1.6rem, 5vw, 2.6rem);
  line-height: 1.25;
  margin-bottom: 1rem;
}

.hero-sub {
  color: var(--muted);
  max-width: 34rem;
  margin-bottom: 1.8rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.hero-scan {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  animation: scan 5.5s linear infinite;
  opacity: 0.55;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.8rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 500;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

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

.btn-primary {
  color: #041018;
  background: linear-gradient(135deg, var(--accent), #7be7df 45%, var(--accent-2));
  box-shadow: 0 10px 30px rgba(47, 211, 200, 0.28);
}

.btn-ghost {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink);
}

.section {
  padding: 5rem 0;
}

.section-head {
  max-width: 640px;
  margin-bottom: 2.4rem;
}

.section-head h2,
.about-copy h2,
.contact-panel h2 {
  font-size: clamp(1.55rem, 3.5vw, 2.2rem);
  line-height: 1.3;
  margin: 0.45rem 0 0.85rem;
}

.section-head p:last-child,
.about-copy p,
.contact-panel p {
  color: var(--muted);
}

.eyebrow {
  color: var(--accent);
  font-size: 0.86rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.about-grid {
  display: grid;
  gap: 2rem;
}

.about-copy p + p {
  margin-top: 1rem;
}

.about-visual {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.about-visual img {
  width: 100%;
  height: 100%;
  min-height: 280px;
  object-fit: cover;
}

.service-list {
  display: grid;
  gap: 1rem;
}

.service-item {
  display: grid;
  gap: 0.8rem;
  padding: 1.4rem 1.2rem;
  border-top: 1px solid var(--line);
  transition: background 0.25s ease, transform 0.25s ease;
}

.service-item:hover {
  background: rgba(255, 255, 255, 0.03);
  transform: translateX(4px);
}

.service-index {
  font-family: var(--font-display);
  color: var(--accent);
  font-size: 0.95rem;
}

.service-item h3 {
  font-size: 1.2rem;
  margin-bottom: 0.35rem;
}

.service-tag {
  color: var(--accent-2);
  font-size: 0.92rem;
  margin-bottom: 0.55rem;
}

.service-item p:last-child {
  color: var(--muted);
}

.advantage-row {
  display: grid;
  gap: 1rem;
}

.advantage-item {
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
}

.advantage-item h3 {
  margin-bottom: 0.55rem;
  font-size: 1.15rem;
}

.advantage-item p {
  color: var(--muted);
}

.contact-panel {
  display: grid;
  gap: 1.5rem;
  padding: 2rem 1.4rem;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  background:
    linear-gradient(145deg, rgba(47, 211, 200, 0.08), rgba(78, 161, 255, 0.05)),
    rgba(255, 255, 255, 0.02);
  box-shadow: var(--shadow);
}

.site-footer {
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.22);
}

.footer-top {
  display: grid;
  gap: 1.2rem;
  margin-bottom: 1.8rem;
}

.footer-note,
.footer-contact p,
.footer-copy {
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-beian {
  text-align: center;
  margin: 1.2rem 0 1rem;
}

.footer-beian a {
  color: #c9d7e0;
  border-bottom: 1px solid rgba(201, 215, 224, 0.35);
  padding-bottom: 2px;
  transition: color 0.2s ease;
}

.footer-beian a:hover {
  color: var(--accent);
}

.footer-copy {
  text-align: center;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.9s ease forwards;
}

.reveal.delay-1 { animation-delay: 0.12s; }
.reveal.delay-2 { animation-delay: 0.24s; }
.reveal.delay-3 { animation-delay: 0.36s; }

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes kenburns {
  from { transform: scale(1.05) translate3d(0, 0, 0); }
  to { transform: scale(1.12) translate3d(-1.5%, -1%, 0); }
}

@keyframes scan {
  0% { top: 18%; opacity: 0; }
  15% { opacity: 0.55; }
  85% { opacity: 0.35; }
  100% { top: 86%; opacity: 0; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-24px); }
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .nav {
    display: flex;
    position: static;
    flex-direction: row;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
  }

  .about-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 3rem;
  }

  .service-item {
    grid-template-columns: 72px 1fr;
    align-items: start;
    padding: 1.6rem 0.4rem;
  }

  .advantage-row {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  .advantage-item {
    padding: 1.6rem 1rem 0 0;
    border-top: 0;
    border-left: 1px solid var(--line);
    padding-left: 1.2rem;
  }

  .advantage-item:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .contact-panel {
    grid-template-columns: 1fr auto;
    align-items: center;
    padding: 2.4rem;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
    align-items: end;
  }

  .footer-contact {
    text-align: right;
  }
}

@media (min-width: 1024px) {
  .hero {
    align-items: center;
    padding-top: 8rem;
  }

  .section {
    padding: 6.5rem 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal,
  .hero-media img,
  .hero-scan,
  .bg-orb {
    animation: none !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}