:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #1d2735;
  --muted: #5a6678;
  --primary: #1b74e4;
  --border: #dce3ef;
  --shadow: 0 12px 28px rgba(12, 30, 62, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;
  background: radial-gradient(circle at top right, #e9f2ff 0, var(--bg) 45%);
  color: var(--text);
}

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

.topbar {
  background: #111827;
  color: #fff;
  height: 64px;
  display: flex;
  align-items: center;
}

.topbar__inner {
  display: flex;
  align-items: center;
}

.hero {
  margin-top: 28px;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 40px 20px;
}

.hero__logo {
  width: 180px;
  height: 180px;
  object-fit: cover;
  border-radius: 999px;
  border: 4px solid #eef3ff;
}

.hero h1 {
  margin: 16px 0 8px;
  font-size: 34px;
}

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

.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 22px;
  border-radius: 10px;
  text-decoration: none;
  color: #fff;
  background: linear-gradient(135deg, #1f7af0, #0d5cc2);
  font-weight: 700;
}

.section {
  margin-top: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 24px;
}

.section h2 {
  margin-top: 0;
}

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

.card {
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  background: #fff;
}

.card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.card h3,
.card p {
  margin: 10px 12px;
}

.card p {
  color: var(--muted);
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.image-grid img,
.slash-image {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.commands p {
  margin: 8px 0;
}

.footer {
  text-align: center;
  padding: 30px 0;
  color: var(--muted);
}

@media (max-width: 900px) {
  .card-grid {
    grid-template-columns: 1fr;
  }

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

  .hero h1 {
    font-size: 28px;
  }
}