:root {
  --bg: #ffffff;
  --fg: #1a1a2e;
  --muted: #5c6478;
  --accent: #4f46e5;
  --accent-dark: #4338ca;
  --card: #f7f8fc;
  --border: #e4e7f0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
}

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 720px; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  z-index: 10;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo { font-weight: 800; font-size: 1.15rem; text-decoration: none; color: var(--fg); letter-spacing: -.02em; }
.logo span { color: var(--accent); }
.site-header nav a {
  margin-left: 22px;
  text-decoration: none;
  color: var(--muted);
  font-size: .95rem;
}
.site-header nav a:hover { color: var(--accent); }

/* Hero */
.hero {
  padding: 80px 0 64px;
  background: linear-gradient(180deg, #f5f6ff 0%, #ffffff 100%);
  text-align: center;
}
.hero h1 { font-size: clamp(1.9rem, 4.5vw, 3rem); letter-spacing: -.03em; line-height: 1.15; max-width: 760px; margin: 0 auto; }
.hero h1 em { color: var(--accent); font-style: normal; }
.hero p { color: var(--muted); font-size: 1.12rem; margin: 18px auto 30px; max-width: 560px; }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 13px 30px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
}
.btn:hover { background: var(--accent-dark); }

/* Sections */
section.container, section { padding-top: 56px; }
section h2 { font-size: 1.6rem; letter-spacing: -.02em; margin-bottom: 22px; }
section.narrow p { color: var(--muted); }

/* Cards */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: transform .15s ease, box-shadow .15s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(30,30,80,.08); }
.card a {
  display: block;
  padding: 22px;
  text-decoration: none;
  color: var(--fg);
  height: 100%;
}
.card h3 { font-size: 1.05rem; line-height: 1.35; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: .92rem; }
.tag {
  display: inline-block;
  margin-top: 14px;
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--accent);
  background: #eef0ff;
  padding: 4px 10px;
  border-radius: 99px;
}

/* Footer */
.site-footer {
  margin-top: 80px;
  border-top: 1px solid var(--border);
  padding: 26px 0;
  color: var(--muted);
  font-size: .88rem;
}