:root {
  --bg: #f5f7ff;
  --text: #111827;
  --subtext: #4b5563;
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --card: #ffffff;
  --line: #e5e7eb;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC",
    "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
}

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

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 68px;
}

.logo {
  font-weight: 700;
  font-size: 20px;
  color: var(--primary-dark);
}

.nav {
  display: flex;
  gap: 20px;
  font-size: 14px;
  color: var(--subtext);
}

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

.hero {
  padding: 64px 0 42px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 24px;
}

.eyebrow {
  margin: 0;
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
}

h1 {
  margin: 8px 0 12px;
  font-size: clamp(34px, 5vw, 52px);
}

.hero-desc {
  margin: 0;
  color: var(--subtext);
  line-height: 1.7;
}

.hero-actions {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  border: 0;
  border-radius: 10px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  padding: 11px 18px;
}

.btn-primary {
  color: #fff;
  background: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  color: var(--primary);
  background: #dbeafe;
}

.stats {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(80px, 1fr));
  gap: 10px;
}

.stats li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
}

.stats strong {
  display: block;
  font-size: 24px;
}

.stats span {
  color: var(--subtext);
  font-size: 13px;
}

.hero-card {
  background: linear-gradient(145deg, #2563eb, #3b82f6);
  color: #fff;
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 16px 40px rgba(37, 99, 235, 0.28);
}

.hero-card h3 {
  margin: 0;
  font-size: 28px;
}

.hero-card p {
  margin-top: 8px;
  opacity: 0.95;
}

.hero-card ul {
  margin: 20px 0 0;
  padding-left: 18px;
  line-height: 1.8;
}

.section {
  padding: 52px 0;
}

.section h2 {
  margin: 0 0 18px;
  font-size: 30px;
}

.section-muted {
  background: #eef2ff;
}

.cards,
.products {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.card,
.product {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
}

.card h3,
.product h3 {
  margin: 0 0 10px;
}

.card p,
.product p {
  margin: 0;
  color: var(--subtext);
  line-height: 1.6;
}

.tag {
  display: inline-block;
  background: #dbeafe;
  color: var(--primary-dark);
  border-radius: 999px;
  font-size: 12px;
  padding: 4px 10px;
  margin-bottom: 10px;
}

.product strong {
  display: inline-block;
  margin-top: 14px;
  color: #ef4444;
  font-size: 20px;
}

.about-text {
  margin: 0;
  max-width: 760px;
  color: var(--subtext);
  line-height: 1.8;
}

.section-contact {
  background: #111827;
  color: #fff;
}

.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 16px;
  align-items: start;
}

.contact-form {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 14px;
  padding: 16px;
  display: grid;
  gap: 10px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.28);
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border-radius: 8px;
  padding: 10px 12px;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(255, 255, 255, 0.7);
}

.form-result {
  margin: 0;
  min-height: 20px;
  font-size: 13px;
}

.footer {
  padding: 20px 0 34px;
  text-align: center;
  color: var(--subtext);
  font-size: 13px;
}

@media (max-width: 920px) {
  .desktop-only,
  .nav {
    display: none;
  }

  .hero-grid,
  .cards,
  .products,
  .contact-wrap {
    grid-template-columns: 1fr;
  }

  .section h2 {
    font-size: 25px;
  }
}