/* ── 개요 배너 ── */
.overview-banner {
  display: grid; grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 16px; margin-bottom: 44px;
}
.ov-item {
  background: rgba(255,255,255,0.82); border: 1px solid rgba(215,228,255,0.8);
  border-radius: 18px; padding: 18px 20px;
  display: flex; flex-direction: column; gap: 6px;
  box-shadow: 0 2px 12px rgba(99,120,220,0.06);
}
.ov-label { font-size: 0.68rem; font-weight: 800; letter-spacing: 0.06em; text-transform: uppercase; color: #b45309; }
.ov-value { font-size: 1rem; font-weight: 800; color: #0f172a; letter-spacing: -0.02em; line-height: 1.3; }
.ov-sub   { font-size: 0.74rem; color: #94a3b8; }

/* ── 사전 준비 배너 ── */
.prep-banner {
  display: flex; align-items: flex-start; gap: 20px;
  background: linear-gradient(135deg, rgba(245,158,11,0.07), rgba(234,88,12,0.05));
  border: 1px solid rgba(245,158,11,0.18); border-radius: 22px; padding: 22px 28px;
  margin-bottom: 40px; position: relative; overflow: hidden;
}
.prep-banner::before {
  content: ""; position: absolute; right: -20px; top: -20px;
  width: 130px; height: 130px; border-radius: 50%;
  background: radial-gradient(circle, rgba(245,158,11,0.12), transparent 70%);
  pointer-events: none;
}
.prep-icon { font-size: 2.6rem; flex-shrink: 0; line-height: 1; }
.prep-body h3 { margin: 0 0 6px; font-size: 1rem; font-weight: 800; color: #0f172a; letter-spacing: -0.02em; }
.prep-body p  { margin: 0; font-size: 0.84rem; color: #64748b; line-height: 1.7; }
.prep-badge {
  margin-left: auto; flex-shrink: 0; padding: 5px 14px; border-radius: 999px;
  font-size: 0.71rem; font-weight: 700;
  background: rgba(245,158,11,0.1); color: #b45309; border: 1px solid rgba(245,158,11,0.22);
}

/* ── 유닛 그리드 ── */
.unit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px;
  padding-bottom: 80px;
}

/* ── 유닛 카드 ── */
.unit-card {
  background: rgba(255,255,255,0.85); border: 1px solid rgba(215,228,255,0.85);
  border-radius: 24px; overflow: hidden; display: flex; flex-direction: column;
  box-shadow: 0 2px 18px rgba(99,120,220,0.07);
  transition: transform 240ms ease, box-shadow 240ms ease, border-color 240ms ease;
  position: relative; backdrop-filter: blur(12px);
}
.unit-card::before {
  content: ""; position: absolute; inset: -1px; border-radius: 25px;
  background: linear-gradient(135deg,rgba(245,158,11,0.55),rgba(234,88,12,0.45),rgba(139,92,246,0.35));
  z-index: -1; opacity: 0; transition: opacity 240ms ease;
}
.unit-card:hover { transform: translateY(-6px); border-color: transparent; box-shadow: 0 16px 48px rgba(245,158,11,0.15); }
.unit-card:hover::before { opacity: 0.5; }

.unit-visual {
  height: 180px; display: flex; align-items: center; justify-content: center;
  font-size: 3.2rem; overflow: hidden; position: relative;
}
.unit-visual img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform 400ms ease;
}
.unit-card:hover .unit-visual img { transform: scale(1.04); }
.unit-card.u-prep .unit-visual { background: linear-gradient(135deg,#fef3c7,#fed7aa); }
.unit-card.u-1    .unit-visual { background: linear-gradient(135deg,#dbeafe,#ede9fe); }
.unit-card.u-2    .unit-visual { background: linear-gradient(135deg,#d1fae5,#a7f3d0); }
.unit-card.u-3    .unit-visual { background: linear-gradient(135deg,#fce7f3,#fbcfe8); }
.unit-card.u-4    .unit-visual { background: linear-gradient(135deg,#e0e7ff,#ddd6fe); }
.unit-card.u-5    .unit-visual { background: linear-gradient(135deg,#fef9c3,#fde68a); }
.unit-card.u-post .unit-visual { background: linear-gradient(135deg,#f0fdf4,#dcfce7); }

.unit-body { padding: 20px 22px 22px; display: flex; flex-direction: column; flex: 1; }
.unit-num {
  display: inline-block; font-size: 0.67rem; font-weight: 800; letter-spacing: 0.07em;
  text-transform: uppercase; color: #b45309;
  background: rgba(245,158,11,0.09); border: 1px solid rgba(245,158,11,0.2);
  border-radius: 999px; padding: 2px 9px; width: fit-content; margin-bottom: 10px;
}
.unit-num.prep-num { background: rgba(99,102,241,0.09); color: #4338ca; border-color: rgba(99,102,241,0.2); }
.unit-title { font-size: 1.05rem; font-weight: 900; color: #0f172a; margin: 0 0 8px; letter-spacing: -0.02em; line-height: 1.3; }
.unit-desc  { font-size: 0.83rem; color: #64748b; line-height: 1.7; margin: 0 0 14px; flex: 1; }

.unit-activities { list-style: none; padding: 0; margin: 0 0 16px; display: flex; flex-direction: column; gap: 5px; }
.unit-activities li {
  display: flex; align-items: flex-start; gap: 7px;
  font-size: 0.78rem; color: #475569; line-height: 1.5;
}
.unit-activities li::before {
  content: ""; width: 5px; height: 5px; border-radius: 50%;
  background: #f59e0b; flex-shrink: 0; margin-top: 6px;
}

.unit-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 14px; border-top: 1px solid rgba(215,228,255,0.7);
}
.unit-meta { font-size: 0.72rem; color: #94a3b8; font-weight: 600; }

/* ── 반응형 ── */
@media (max-width: 640px) {
  .overview-banner { grid-template-columns: 1fr 1fr; }
}