/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #4F6BF6;
  --primary-light: #EEF1FE;
  --purple: #7C3AED;
  --sky: #0EA5E9;
  --amber: #F59E0B;
  --text: #1E293B;
  --text-light: #64748B;
  --bg: #FFFFFF;
  --bg-alt: #F8FAFC;
  --border: #E2E8F0;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,.06);
  --shadow-hover: 0 12px 36px rgba(79,107,246,.12);
  --transition: .3s cubic-bezier(.4,0,.2,1);
}
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ===== Animations ===== */
.fade-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity .7s ease, transform .7s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(3deg); }
}

/* ===== NAV ===== */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
}
#navbar.scrolled {
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 12px rgba(0,0,0,.06);
  padding: 10px 0;
}
.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--primary);
}
.logo img {
  height: 32px;
  width: auto;
  border-radius: 4px;
}
.nav-links {
  display: flex;
  gap: 32px;
}
.nav-links a {
  font-size: .938rem;
  font-weight: 500;
  color: var(--text-light);
  transition: color var(--transition);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--primary);
  transition: width var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
}
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}
.nav-actions { display: flex; align-items: center; gap: 12px; }
#lang-toggle {
  background: var(--primary-light);
  color: var(--primary);
  border: none;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: .813rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
#lang-toggle:hover {
  background: var(--primary);
  color: #fff;
}
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}
.mobile-menu {
  display: none;
}

/* ===== HERO ===== */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  overflow: hidden;
  background: linear-gradient(160deg, #F0F4FF 0%, #FFFFFF 40%, #F5F3FF 100%);
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.geo {
  position: absolute;
  border-radius: 50%;
  opacity: .35;
  animation: float 8s ease-in-out infinite;
}
.geo-1 {
  width: 300px; height: 300px;
  top: -60px; right: -80px;
  background: radial-gradient(circle, rgba(79,107,246,.15), transparent 70%);
  animation-delay: 0s;
}
.geo-2 {
  width: 200px; height: 200px;
  bottom: 10%; left: -40px;
  background: radial-gradient(circle, rgba(124,58,237,.12), transparent 70%);
  animation-delay: -2s;
}
.geo-3 {
  width: 140px; height: 140px;
  top: 30%; right: 15%;
  background: radial-gradient(circle, rgba(14,165,233,.12), transparent 70%);
  animation-delay: -4s;
}
.geo-4 {
  width: 180px; height: 180px;
  bottom: 20%; right: -30px;
  background: radial-gradient(circle, rgba(245,158,11,.10), transparent 70%);
  animation-delay: -6s;
}
.geo-5 {
  width: 100px; height: 100px;
  top: 20%; left: 10%;
  background: radial-gradient(circle, rgba(79,107,246,.10), transparent 70%);
  animation-delay: -3s;
}
.hero-content { position: relative; z-index: 1; max-width: 700px; }
.hero-content h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.02em;
  margin-bottom: 20px;
}
.hero-sub {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-light);
  margin-bottom: 36px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}
.btn-primary {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 36px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.btn-primary:hover {
  background: #3B52D4;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(79,107,246,.3);
}

/* ===== SECTION COMMON ===== */
.section {
  padding: 100px 0;
}
.section-alt {
  background: var(--bg-alt);
}
.section-title {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
}
.section-sub {
  text-align: center;
  color: var(--text-light);
  margin-bottom: 48px;
  font-size: 1.05rem;
}

/* ===== SERVICE CARDS ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}
.card-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  border-radius: 16px;
}
.card:nth-child(2) .card-icon { background: #F3EEFF; }
.card:nth-child(3) .card-icon { background: #E0F2FE; }
.card:nth-child(4) .card-icon { background: #FEF3C7; }
.card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  font-weight: 700;
}
.card p {
  font-size: .9rem;
  color: var(--text-light);
  line-height: 1.7;
}

/* ===== ABOUT ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-text .section-title {
  text-align: left;
}
.about-text p {
  color: var(--text-light);
  margin-top: 16px;
  font-size: 1.02rem;
}
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.stat-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: transform var(--transition);
}
.stat-item:hover {
  transform: translateY(-4px);
}
.stat-num {
  display: block;
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: .875rem;
  color: var(--text-light);
  font-weight: 500;
}

/* ===== TECH ===== */
.tech-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 56px;
}
.tech-tag {
  display: inline-block;
  padding: 10px 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: .875rem;
  font-weight: 500;
  color: var(--text);
  transition: all var(--transition);
}
.tech-tag:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}
.tag-lg { font-size: .95rem; padding: 12px 24px; }
.tag-md { font-size: .9rem; padding: 10px 22px; }
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.adv-item {
  text-align: center;
  padding: 32px 20px;
}
.adv-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.adv-item h4 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  font-weight: 700;
}
.adv-item p {
  font-size: .875rem;
  color: var(--text-light);
}

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-group label {
  font-size: .875rem;
  font-weight: 600;
}
.form-group input,
.form-group textarea {
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: .95rem;
  font-family: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,107,246,.12);
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.info-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.info-item svg {
  flex-shrink: 0;
  margin-top: 2px;
}
.info-item strong {
  display: block;
  font-size: .813rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-bottom: 4px;
}
.info-item span {
  font-size: .95rem;
}
.qr-placeholder {
  margin-top: 8px;
}

/* ===== FOOTER ===== */
#footer {
  background: var(--text);
  color: #CBD5E1;
  padding: 40px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-brand .logo-text {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
}
.footer-brand p {
  font-size: .813rem;
  margin-top: 4px;
}
.footer-social {
  display: flex;
  gap: 16px;
}
.footer-social a {
  color: #94A3B8;
  transition: color var(--transition);
}
.footer-social a:hover {
  color: #fff;
}
.footer-copy {
  font-size: .813rem;
  color: #64748B;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .cards-grid,
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-menu-btn { display: flex; }
  .mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: rgba(255,255,255,.97);
    backdrop-filter: blur(12px);
    padding: 16px 24px;
    box-shadow: 0 8px 24px rgba(0,0,0,.08);
  }
  .mobile-menu.open { display: flex; flex-direction: column; gap: 12px; }
  .mobile-menu a {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text);
    padding: 8px 0;
  }
  .cards-grid,
  .advantages-grid {
    grid-template-columns: 1fr;
  }
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .about-text .section-title {
    text-align: center;
  }
  .about-text { text-align: center; }
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
  #hero { padding-top: 100px; }
  .section { padding: 72px 0; }
}
@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}