:root {
  --bg: #ffffff;
  --ink: #111111;
  --muted: #f3f4f6;
  --line: #e5e7eb;
  --accent: #000000;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.narrow {
  max-width: 760px;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}

.brand-name {
  font-weight: 600;
  letter-spacing: 0.08em;
}

.main-nav a {
  margin-left: 28px;
  font-size: 0.9rem;
  opacity: 0.8;
}

.main-nav a:hover {
  opacity: 1;
}

.hero {
  padding: 96px 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 64px;
  align-items: center;
}

.hero h1 {
  font-size: 3rem;
  line-height: 1.15;
  margin-bottom: 24px;
}

.hero p {
  font-size: 1.05rem;
  max-width: 520px;
}

.hero-mark img {
  max-width: 100%;
  height: auto;
  opacity: 0.95;
}

.section {
  padding: 88px 0;
}

.section.muted {
  background: var(--muted);
}

h2 {
  font-size: 2rem;
  margin-bottom: 32px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.card {
  padding: 32px;
  background: #fff;
  border: 1px solid var(--line);
}

.card h3 {
  margin-top: 0;
}

.contact-line {
  margin-top: 16px;
  font-weight: 500;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 32px 0;
  font-size: 0.85rem;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  opacity: 0.7;
}

@media (max-width: 900px) {
  .hero-grid,
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2.4rem;
  }
}