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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
}

body {
  font-family: Pretendard, "Noto Sans KR", sans-serif;
}

/* 창 크기에 맞춰 두 컬럼(히어로 70% · 목록 30%)이 같이 늘어난다 — 레터박스 없음 */
.b {
  width: 100vw;
  height: 100vh;
  display: grid;
  grid-template-columns: 7fr 3fr;
  background: #f3f4f6;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

svg.i {
  width: 1em;
  height: 1em;
  vertical-align: -.12em;
}

/* ── 좌측 히어로 ────────────────────────────────────────── */

.l {
  background: #0f3d3a;
  color: #fff;
  padding: 70px 80px 100px;
  display: flex;
  flex-direction: column;
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding-bottom: 26px;
  border-bottom: 1px solid #2c5d59;
}

.top .dt {
  font-size: 26px;
  color: #a7c4c0;
  font-weight: 500;
  padding-bottom: 8px;
}

.top .ck {
  display: block;
  font-size: 100px;
  font-weight: 700;
  line-height: 1;
}

.lab {
  margin-top: 30px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 25px;
  font-weight: 700;
  color: #7fe0cf;
  letter-spacing: .06em;
}

.lab i {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #2dd4bf;
  box-shadow: 0 0 0 5px rgba(45, 212, 191, .25);
}

.rm {
  margin-top: 14px;
  font-size: 70px;
  font-weight: 800;
  color: #7fe0cf;
}

.cs {
  font-size: 140px;
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: 0;
  white-space: nowrap;
}

.pt {
  margin-top: 16px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.pt span {
  font-size: 35px;
  font-weight: 700;
  background: #1b524d;
  padding: 10px 20px;
  border-radius: 8px;
  color: #d6e6e3;
}

.pt b {
  font-size: 65px;
  font-weight: 700;
}

.idle {
  margin-top: 14px;
  font-size: 38px;
  font-weight: 700;
  color: #a7c4c0;
}

.cta {
  margin-top: auto;
  background: #2dd4bf;
  color: #06302c;
  font-size: 50px;
  font-weight: 800;
  padding: 26px 34px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  gap: 16px;
}

/* JS가 채우는 래퍼 div — .l의 flex 자식 관계를 그대로 유지해야 .cta의 margin-top:auto(바닥 고정)가 먹는다 */
#hero-current, #hero-cta {
  display: contents;
}

/* ── 우측 강의실 현황 목록 ──────────────────────────────── */

.r {
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
}

h2 {
  font-size: 22px;
  font-weight: 700;
  color: #111827;
}

.list {
  margin-top: 18px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 0 0 1px #e5e7eb;
  overflow: hidden;
}

.it {
  padding: 22px 24px;
  border-bottom: 1px solid #eef0f2;
  display: grid;
  grid-template-columns: 70px 1fr;
  row-gap: 10px;
  align-items: center;
}

.it:last-child {
  border-bottom: 0;
}

.it.hl {
  background: #ecfdf8;
  box-shadow: inset 6px 0 0 #0f766e;
}

.no {
  font-size: 28px;
  font-weight: 800;
  color: #111827;
}

.nm {
  font-size: 26px;
  font-weight: 700;
  color: #111827;
}

.meta {
  grid-column: 2;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  color: #6b7280;
}

.st {
  font-size: 15px;
  font-weight: 700;
  padding: 5px 11px;
  border-radius: 6px;
}

.on   { background: #dcfce7; color: #166534; }
.wait { background: #f3f4f6; color: #4b5563; }
.tag  { background: #0f766e; color: #fff; }
.brk  { background: #fef3c7; color: #92400e; }
.off  { background: #f3f4f6; color: #6b7280; }