:root {
  --bg: #f5f8ff;
  --surface: #ffffff;
  --surface-2: #f0f4ff;
  --text: #0b1220;
  --muted: #5a6475;
  --primary: #1f6bff;
  --primary-soft: #e8f0ff;
  --border: #dbe4fb;
  --shadow: 0 12px 30px rgba(20, 45, 94, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f7f9ff 0%, #f1f5ff 100%);
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 70px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 800;
  letter-spacing: 0.03em;
}

.logo-img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
}

.logo span {
  color: var(--text);
  font-style: normal;
}

.logo em {
  color: var(--primary);
  font-style: normal;
}

.top-nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.top-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
}

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

.menu-btn {
  display: none;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 10px;
  padding: 0.4rem 0.6rem;
}

.hero {
  padding: 4.5rem 0 2.2rem;
}

.label {
  display: inline-block;
  margin: 0;
  background: var(--primary-soft);
  color: var(--primary);
  border: 1px solid #ceddff;
  font-size: 0.85rem;
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font-weight: 600;
}

h1 {
  margin: 1rem 0;
  font-size: clamp(1.8rem, 4.3vw, 3rem);
  line-height: 1.18;
}

.subtitle {
  max-width: 800px;
  color: var(--muted);
  line-height: 1.7;
  margin: 0 0 1.4rem;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.badges span {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.46rem 0.85rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.platform-switch {
  margin-top: 1.5rem;
  display: flex;
  gap: 0.7rem;
}

.platform-btn {
  border: 1px solid #c8d8ff;
  border-radius: 10px;
  background: var(--surface);
  color: #36589f;
  padding: 0.62rem 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: 0.18s ease;
}

.platform-btn.active,
.platform-btn:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.cards-section {
  padding: 1.4rem 0 3.8rem;
}

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.2rem 1.2rem 1.1rem;
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0 0 0.55rem;
  font-size: 1.18rem;
}

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

.card-link {
  display: inline-block;
  margin-top: 0.9rem;
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
}

.card-link:hover {
  text-decoration: underline;
}

.hidden {
  display: none;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: #f9fbff;
}

.site-footer p {
  margin: 0;
  padding: 1.3rem 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 860px) {
  .top-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    margin-bottom: 0.8rem;
  }

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

  .menu-btn {
    display: block;
  }

  .nav-wrap {
    flex-wrap: wrap;
    padding: 0.8rem 0;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }
}