:root {
  --bg: #0f1117;
  --surface: #181c27;
  --border: #2a3045;
  --accent: #4f8ef7;
  --accent2: #34d4a0;
  --text: #e8eaf0;
  --muted: #6b7390;
}

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

/* ── PC 기본: 화면 중앙 정렬 ── */
body {
  font-family: 'Noto Sans KR', sans-serif;
  background: radial-gradient(ellipse at 60% 40%, #1a2340 0%, #0f1117 70%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  padding: 48px 24px;
}

.wrap {
  text-align: center;
  width: 100%;
  max-width: 640px;
}

/* ── Header ── */
.logo {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  letter-spacing: 4px;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 12px;
}

h1 {
  font-size: clamp(20px, 5vw, 28px);
  font-weight: 700;
  margin-bottom: 8px;
}

.sub {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 40px;
}

/* ── Grid: PC에서 auto-fit 다열 ── */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}

/* ── Card ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 20px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.2s, transform 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.card:active {
  transform: translateY(0);
}

.card-icon {
  font-size: 28px;
  margin-bottom: 6px;
}

.card-title {
  font-size: 15px;
  font-weight: 600;
}

.card-desc {
  font-size: 12px;
  color: var(--muted);
}

/* ════════════════════════════
   Tablet  (~ 768px)
════════════════════════════ */
@media (max-width: 768px) {
  .card {
    padding: 22px 16px;
  }
}

/* ════════════════════════════
   Mobile  (~ 480px)
   핵심: body를 flex 중앙고정 해제
   → 콘텐츠가 늘어나도 스크롤 가능
════════════════════════════ */
@media (max-width: 480px) {
  body {
    align-items: flex-start;   /* 세로 중앙 고정 해제 */
    padding: 48px 16px 40px;
  }

  .sub {
    margin-bottom: 28px;
  }

  .grid {
    grid-template-columns: 1fr; /* 1열 세로 나열 */
    gap: 12px;
  }

  .card {
    flex-direction: column;
    align-items: center;
    padding: 20px 16px;
    border-radius: 14px;
  }
}