:root {
  --bg: #050714;
  --bg-2: #0b1224;
  --surface: rgba(255, 255, 255, 0.05);
  --surface-strong: rgba(255, 255, 255, 0.09);
  --border: rgba(148, 163, 184, 0.14);
  --primary: #2f7dff;
  --primary-2: #38bdf8;
  --accent: #f59e0b;
  --text: #f0f6ff;
  --muted: #94a3b8;
  --radius: 16px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  --max: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--primary-2); text-decoration: none; }
a:hover { color: #7dd3fc; }

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

.container {
  width: min(92%, var(--max));
  margin: 0 auto;
}

/* Header */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 18px 0;
  transition: background .25s ease, box-shadow .25s ease, padding .25s ease;
  border-bottom: 1px solid transparent;
}

.header.scrolled {
  background: rgba(5, 7, 20, 0.85);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
  padding: 12px 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo img {
  height: 48px;
  width: auto;
  filter: drop-shadow(0 0 6px rgba(47, 125, 255, 0.25));
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.04em;
  line-height: 1.3;
}

.logo-sub {
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.08em;
}

.nav { display: flex; align-items: center; gap: 8px; }

.nav a {
  color: var(--muted);
  font-size: 0.95rem;
  padding: 8px 14px;
  border-radius: 8px;
  transition: color .2s, background .2s;
}

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

.nav .cta {
  margin-left: 10px;
  padding: 8px 18px;
  border: 1px solid var(--primary);
  color: var(--primary-2);
}

.nav .cta:hover {
  background: rgba(47, 125, 255, 0.12);
  color: #fff;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform .2s, box-shadow .2s, background .2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #1d4ed8);
  color: #fff;
  box-shadow: 0 8px 28px rgba(47, 125, 255, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(47, 125, 255, 0.45);
}

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

.btn-outline:hover {
  border-color: var(--primary-2);
  color: var(--primary-2);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 140px 0 120px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 20% 30%, rgba(47, 125, 255, 0.18), transparent 35%),
    radial-gradient(circle at 80% 20%, rgba(56, 189, 248, 0.12), transparent 30%),
    radial-gradient(circle at 60% 80%, rgba(245, 158, 11, 0.08), transparent 28%),
    var(--bg);
}

.hero-grid {
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.08) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(circle at 50% 40%, black, transparent 70%);
}

.hero-glow {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 900px; height: 900px;
  background: radial-gradient(circle, rgba(47, 125, 255, 0.16), transparent 60%);
  z-index: -1;
  pointer-events: none;
  animation: pulseGlow 6s ease-in-out infinite;
}

@keyframes pulseGlow {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: .7; }
  50% { transform: translate(-50%, -50%) scale(1.1); opacity: 1; }
}

.hero-content { max-width: 900px; margin: 0 auto; }

.eyebrow {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 99px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--primary-2);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5.5vw, 4.2rem);
  line-height: 1.18;
  font-weight: 800;
  margin-bottom: 22px;
  background: linear-gradient(180deg, #fff 0%, #93c5fd 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-desc {
  color: var(--muted);
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  max-width: 720px;
  margin: 0 auto 38px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

.hero-chips {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.chip {
  padding: 10px 18px;
  border-radius: 99px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--primary-2);
  display: flex;
  align-items: center;
  gap: 8px;
}

.chip::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

.scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.78rem;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

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

.section-alt { background: var(--bg-2); }

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 64px;
}

.section-tag {
  display: inline-block;
  color: var(--primary-2);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
  text-transform: uppercase;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
}

.section-sub {
  color: var(--muted);
  font-size: 1.05rem;
}

/* Value strip */
.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.value-card {
  padding: 36px 28px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: transform .25s, border-color .25s, box-shadow .25s;
}

.value-card:hover {
  transform: translateY(-6px);
  border-color: rgba(47, 125, 255, 0.4);
  box-shadow: 0 20px 50px rgba(0,0,0,0.28);
}

.value-card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 10px;
}

.value-card h3 svg { color: var(--primary-2); flex: none; }

.value-card p { color: var(--muted); font-size: 0.95rem; line-height: 1.75; }

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 56px;
  align-items: center;
}

.about-text .lead {
  font-size: 1.2rem;
  color: var(--text);
  margin-bottom: 22px;
  line-height: 1.8;
}

.about-text p { color: var(--muted); margin-bottom: 16px; }

.about-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 28px;
}

.feature-mini {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--muted);
  font-size: 0.95rem;
}

.feature-mini svg { flex: none; color: var(--primary-2); margin-top: 3px; }

.about-card {
  padding: 34px;
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(47,125,255,0.1), rgba(56,189,248,0.04));
  border: 1px solid rgba(47,125,255,0.25);
}

.about-card h4 {
  font-size: 1.25rem;
  margin-bottom: 22px;
  color: var(--text);
}

.pursuit-list { display: flex; flex-direction: column; gap: 18px; }

.pursuit-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  border-radius: 12px;
  background: rgba(255,255,255,0.03);
}

.pursuit-item strong {
  display: block;
  color: var(--text);
  font-size: 1.05rem;
  margin-bottom: 4px;
}

.pursuit-item span { color: var(--muted); font-size: 0.92rem; }

/* Advantages */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.adv-card {
  padding: 40px 30px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  text-align: center;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}

.adv-card:hover {
  transform: translateY(-6px);
  border-color: rgba(47, 125, 255, 0.4);
  box-shadow: 0 22px 60px rgba(0,0,0,0.28);
}

.adv-icon {
  width: 68px; height: 68px;
  margin: 0 auto 22px;
  border-radius: 18px;
  background: rgba(47,125,255,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-2);
}

.adv-card h3 { font-size: 1.25rem; margin-bottom: 12px; }
.adv-card p { color: var(--muted); font-size: 0.95rem; line-height: 1.75; }

/* Services */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.service-card {
  padding: 36px 30px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  text-align: center;
  transition: transform .25s, border-color .25s;
}

.service-card:hover {
  transform: translateY(-6px);
  border-color: rgba(56, 189, 248, 0.35);
}

.service-number {
  width: 48px; height: 48px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
}

.service-card h3 { font-size: 1.25rem; margin-bottom: 10px; }
.service-card p { color: var(--muted); font-size: 0.95rem; }

/* Contact */
.contact-section { background: linear-gradient(180deg, var(--bg-2), var(--bg)); }

.contact-card {
  max-width: 720px;
  margin: 0 auto;
  padding: 52px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  text-align: center;
}

.contact-methods {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
  margin: 42px 0 36px;
}

.contact-item {
  padding: 28px;
  border-radius: 14px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  transition: transform .2s, border-color .2s;
}

.contact-item:hover { transform: translateY(-4px); border-color: rgba(47,125,255,0.35); }

.contact-item svg { color: var(--primary-2); margin-bottom: 14px; }

.contact-item .label { color: var(--muted); font-size: 0.85rem; margin-bottom: 6px; }
.contact-item .info { color: var(--text); font-size: 1.35rem; font-weight: 700; }
.contact-item a.info { display: inline-block; }
.contact-item a.info:hover { color: var(--primary-2); }

/* Footer */
.footer {
  padding: 50px 0 28px;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 28px;
}

.footer-logo { display: flex; align-items: center; gap: 14px; }
.footer-logo img { height: 46px; width: auto; }
.footer-logo .txt { font-weight: 700; font-size: 1.1rem; }

.footer-contact { display: flex; gap: 28px; flex-wrap: wrap; color: var(--muted); font-size: 0.92rem; }
.footer-contact a { color: var(--muted); }
.footer-contact a:hover { color: var(--primary-2); }

.footer-bottom {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}

.footer-bottom a { color: var(--muted); }
.footer-bottom a:hover { color: var(--primary-2); }

/* Back to top */
.back-top {
  position: fixed;
  right: 24px; bottom: 24px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0; visibility: hidden;
  transition: opacity .25s, visibility .25s, transform .25s;
  z-index: 999;
}

.back-top.visible { opacity: 1; visibility: visible; }
.back-top:hover { transform: translateY(-3px); border-color: var(--primary); color: var(--primary-2); }

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .65s ease, transform .65s ease;
}
.reveal.show { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 900px) {
  .nav { display: none; }
  .menu-toggle { display: block; }
  .nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: rgba(5, 7, 20, 0.96);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    gap: 6px;
  }
  .nav.open a { width: 100%; }
  .nav .cta { margin-left: 0; margin-top: 8px; text-align: center; }

  .values-grid,
  .adv-grid,
  .service-grid,
  .about-grid,
  .about-features,
  .contact-methods {
    grid-template-columns: 1fr;
  }
  .section { padding: 80px 0; }
  .contact-card { padding: 34px 24px; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 2rem; }
  .logo-title { font-size: 0.95rem; }
  .logo-sub { font-size: 0.65rem; }
}