:root{
  --navy:#25324a;
  --accent:#6d72f2;
  --accent-soft:rgba(109,114,242,.12);
  --bg:#ffffff;
  --surface:#f7f8fb;
  --text:#121420;
  --muted:#6b7280;
  --line:#e5e7eb;
  --radius:22px;
  --max:1120px;
}

*{box-sizing:border-box}
body{
  margin:0;
  font-family:"Noto Sans KR", system-ui, sans-serif;
  background:var(--bg);
  color:var(--text);
}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}

.topbar{
  position:sticky;
  top:0;
  background:rgba(255,255,255,.85);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar .inner{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:14px 0;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700}
.dot{
  width:10px;height:10px;border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 0 6px var(--accent-soft);
}

.btn{
  padding:12px 18px;
  border-radius:999px;
  border:1px solid var(--line);
  background:#fff;
  cursor:pointer;
  text-decoration:none;
}
.btn.primary{
  background:var(--accent);
  color:#fff;
  border:none;
}
.btn.large{font-size:16px;padding:14px 26px}

.page{padding:60px 0}

/* ===== 수업 탭 ===== */

/* 탭 버튼 클릭 안 되는 문제 해결 */
.tab-buttons {
  position: relative;
  z-index: 20;
}

.tab-btn {
  pointer-events: auto;
}

.lesson-tabs{
  margin-top:100px;
}

.tab-buttons{
  display:flex;
  justify-content:center;
  gap:12px;
  margin-bottom:40px;
}

.tab-btn{
  padding:10px 22px;
  border-radius:999px;
  border:1px solid var(--line);
  background:#fff;
  cursor:pointer;
  font-size:14px;
}

.tab-btn.active{
  background:var(--accent);
  color:#fff;
  border:none;
}

.tab-content{
  display:none;
}

.tab-content.active{
  display:block;
}

.sub-title{
  margin:40px 0 20px;
  font-size:18px;
  color:var(--navy);
}


.lesson-hero{
  display:grid;
  grid-template-columns:1.2fr .8fr;
  gap:40px;
  align-items:center;
}
.lesson-hero h1{
  font-size:36px;
  line-height:1.2;
  color:var(--navy);
}
.lesson-hero p{
  font-size:16px;
  line-height:1.7;
  color:var(--muted);
}
.hero-illust img{width:100%;max-width:360px}

.lesson-time,
.lesson-features,
.lesson-flow,
.lesson-cta{
  margin-top:100px;
}

h2{
  font-size:24px;
  color:var(--navy);
  margin-bottom:24px;
}

.time-card{
  display:flex;
  align-items:baseline;
  gap:12px;
  background:var(--surface);
  padding:30px;
  border-radius:var(--radius);
}
.time-number{
  font-size:64px;
  font-weight:800;
  color:var(--accent);
}
.time-unit{font-size:20px}
.time-card p{margin-left:20px;color:var(--muted)}

.feature-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:20px;
}
.feature-card{
  padding:24px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
}
.feature-card h3{margin-top:0;color:var(--navy)}

.flow-line{
  position:relative;
  display:grid;
  gap:28px;
}
.flow-step{
  display:flex;
  gap:20px;
  align-items:flex-start;
}
.step-num{
  width:36px;height:36px;
  border-radius:50%;
  background:var(--accent);
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:700;
}
.step-content h4{margin:0;color:var(--navy)}
.step-content p{margin:6px 0 0;color:var(--muted)}

.lesson-cta{
  text-align:center;
  background:linear-gradient(180deg,var(--accent-soft),#fff);
  padding:60px 20px;
  border-radius:var(--radius);
}

.hero-video{
  position:relative;
  width:100%;
  height:80vh;
  overflow:hidden;
}

.hero-video video{
  position: absolute;
  inset: 0;
  width:100%;
  height:100%;
  object-fit:cover;
  z-index: 0;
}

.hero-overlay{
  position:absolute;
  inset:0;
  display:flex;
  flex-direction: column;   /* ⭐ 핵심 */
  align-items:center;
  justify-content:center;
  background:rgba(0,0,0,.05);
  text-align:center;
}


.hero-overlay h1{
  color:#fff;
  font-size:42px;
  font-weight:600;
  letter-spacing:-0.02em;
}

.lesson-intro{
  max-width:720px;
  margin:100px auto 0;
  text-align:center;
  font-size:16px;
  line-height:1.8;
  color:var(--muted);
}

.hero-text{
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 720px;
  padding: 0 20px;
}


/* 메인 문구 */
.hero-overlay h1{
  color:#fff;
  font-size:42px;
  font-weight:600;
  letter-spacing:-0.02em;
  /*margin-bottom:16px;*/
  margin-bottom: 0;  /* 간격은 p에서만 조절 */
}

/* 보조 설명 */
.hero-sub{
  margin-top: 28px;   /* ← 이 값으로 아래로 내림 */
  color: rgba(255,255,255,.85);
  font-size: 15px;
  line-height: 1.8;
}



@media(max-width:900px){
  .lesson-hero{grid-template-columns:1fr;text-align:center}
  .feature-grid{grid-template-columns:1fr}
}