:root {
  --bg: #0f1115;
  --bg-soft: #171a21;
  --card: #1c2029;
  --line: #2a2f3a;
  --text: #e8eaed;
  --muted: #9aa3b2;
  --accent: #6c5ce7;
  --accent-2: #a98bff;
  --gold: #ffc53d;
  --radius: 16px;
  --max: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Malgun Gothic",
    "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* ---------- Header ---------- */
header.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(15, 17, 21, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
  position: relative;
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  padding: 0;
  line-height: 0;
}
.brand { font-weight: 800; font-size: 20px; letter-spacing: -0.02em; }
.brand span { color: var(--accent-2); }
.nav-links { display: flex; gap: 26px; align-items: center; }
.nav-links a { color: var(--muted); font-size: 15px; transition: color .15s; }
.nav-links a:hover { color: var(--text); }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 11px 20px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 15px;
  border: none;
  cursor: pointer;
  transition: transform .12s, background .15s;
}
.btn:hover { background: #5a4bd1; transform: translateY(-1px); }
.btn.ghost { background: transparent; border: 1px solid var(--line); color: var(--text); }
.btn.ghost:hover { border-color: var(--accent-2); background: transparent; }
.btn.lg { padding: 16px 30px; font-size: 17px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 86px 0 70px;
  background:
    radial-gradient(1100px 480px at 70% -10%, rgba(108, 92, 231, 0.28), transparent 60%),
    radial-gradient(800px 400px at 0% 10%, rgba(169, 139, 255, 0.12), transparent 55%);
}
.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--accent-2);
  background: rgba(108, 92, 231, 0.12);
  border: 1px solid rgba(108, 92, 231, 0.35);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.18;
  letter-spacing: -0.03em;
  margin: 0 0 18px;
  font-weight: 800;
}
.hero h1 .hl {
  background: linear-gradient(120deg, var(--accent-2), #c9b6ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.sub {
  font-size: clamp(16px, 2.4vw, 20px);
  color: var(--muted);
  max-width: 640px;
  margin: 0 0 30px;
}
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.price-tag { display: flex; align-items: baseline; gap: 10px; margin-left: 4px; }
.price-tag .now { font-size: 24px; font-weight: 800; }
.price-tag .was { color: var(--muted); text-decoration: line-through; font-size: 15px; }

.trust {
  display: flex;
  gap: 26px;
  margin-top: 40px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 14px;
}
.trust b { color: var(--text); }

/* ---------- Sections ---------- */
section { padding: 72px 0; }
.section-head { text-align: center; margin-bottom: 46px; }
.section-head h2 {
  font-size: clamp(24px, 3.5vw, 34px);
  letter-spacing: -0.02em;
  margin: 0 0 12px;
  font-weight: 800;
}
.section-head p { color: var(--muted); margin: 0; }

.alt { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

/* feature grid */
.grid { display: grid; gap: 18px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.feature {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}
.feature .ic {
  width: 40px; height: 40px; border-radius: 10px;
  display: grid; place-items: center;
  background: rgba(108, 92, 231, 0.16);
  color: var(--accent-2);
  font-size: 20px; margin-bottom: 14px;
}
.feature h3 { margin: 0 0 6px; font-size: 17px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; }

/* curriculum */
.curri { display: flex; flex-direction: column; gap: 12px; max-width: 760px; margin: 0 auto; }
.curri-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 22px;
}
.curri-item h3 { margin: 0 0 4px; font-size: 17px; }
.curri-item p { margin: 0; color: var(--muted); font-size: 14px; }

/* ---------- Reviews ---------- */
.reviews-stats {
  display: flex; align-items: center; justify-content: center; gap: 14px;
  margin-bottom: 8px;
}
.reviews-stats .big { font-size: 40px; font-weight: 800; }
.stars { color: var(--gold); letter-spacing: 2px; }
.reviews-grid { columns: 2; column-gap: 18px; }
.review {
  break-inside: avoid;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 22px;
  margin-bottom: 18px;
}
.review-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.review-who { display: flex; align-items: center; gap: 10px; }
.avatar {
  width: 38px; height: 38px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid; place-items: center; font-weight: 700; color: #fff; font-size: 15px;
}
.review-name { font-weight: 700; font-size: 15px; }
.review-badge { font-size: 12px; color: var(--accent-2); }
.review-date { color: var(--muted); font-size: 13px; }
.review-body { color: #d3d7df; font-size: 14.5px; white-space: pre-wrap; }
.review-body.clamp {
  display: -webkit-box; -webkit-line-clamp: 6; -webkit-box-orient: vertical; overflow: hidden;
}
.more-btn {
  margin-top: 8px; background: none; border: none; color: var(--accent-2);
  cursor: pointer; font-size: 13px; padding: 0; font-weight: 600;
}

/* ---------- CTA / Footer ---------- */
.cta-band { text-align: center; }
.cta-band h2 { font-size: clamp(24px, 4vw, 36px); margin: 0 0 14px; }
.cta-band p { color: var(--muted); margin: 0 0 28px; }

footer {
  border-top: 1px solid var(--line);
  padding: 40px 0;
  color: var(--muted);
  font-size: 13px;
}
.foot-inner { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }

/* ---------- Responsive ---------- */
/* ---------- Page hero (subpages) ---------- */
.page-hero {
  padding: 70px 0 30px;
  background: radial-gradient(900px 360px at 60% -20%, rgba(108, 92, 231, 0.22), transparent 60%);
}
.page-hero h1 { font-size: clamp(28px, 4vw, 40px); margin: 0 0 8px; letter-spacing: -0.02em; }

/* ---------- Forms ---------- */
.form { display: flex; flex-direction: column; gap: 12px; }
.form input, .form textarea {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
  width: 100%;
}
.form input:focus, .form textarea:focus { outline: none; border-color: var(--accent); }
.form textarea { resize: vertical; }

/* ---------- Apply page ---------- */
.apply-steps { display: flex; flex-direction: column; gap: 12px; margin: 18px 0; }
.step { display: flex; gap: 14px; align-items: flex-start; }
.step > b {
  flex: 0 0 28px; height: 28px; border-radius: 50%;
  background: var(--accent); color: #fff;
  display: grid; place-items: center; font-size: 14px;
}
.step > div b { color: var(--accent-2); }
.bank-box {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 14px; padding: 22px 24px;
}
.bank-row { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--line); }
.bank-row:last-child { border-bottom: none; }
.bank-row span { color: var(--muted); }
.bank-row b { font-size: 16px; }

/* ---------- Notice ---------- */
.notice-item { border-bottom: 1px solid var(--line); padding: 22px 0; }
.notice-date { color: var(--accent-2); font-size: 13px; font-weight: 600; }
.notice-title { margin: 6px 0 8px; font-size: 19px; }
.notice-body { margin: 0; color: var(--muted); white-space: pre-wrap; }

/* ---------- Classroom ---------- */
.lesson-layout { display: grid; grid-template-columns: 1fr 320px; gap: 24px; align-items: start; }
.player {
  position: relative; width: 100%; padding-top: 56.25%;
  background: #000; border-radius: 14px; overflow: hidden; border: 1px solid var(--line);
}
.player iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.lesson-list {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 14px; padding: 10px; max-height: 70vh; overflow-y: auto;
}
.lesson-section {
  font-size: 13px; font-weight: 700; color: var(--muted);
  padding: 14px 12px 6px;
}
.lesson {
  display: flex; justify-content: space-between; align-items: center; gap: 10px;
  padding: 11px 12px; border-radius: 9px; cursor: pointer; transition: background .12s;
}
.lesson:hover { background: var(--bg-soft); }
.lesson.active { background: rgba(108, 92, 231, 0.18); }
.lesson.active .lesson-title { color: var(--accent-2); font-weight: 600; }
.lesson-title { font-size: 14.5px; }
.lesson-dur { color: var(--muted); font-size: 12px; flex: 0 0 auto; }
.free-tag {
  margin-left: 8px; font-size: 11px; color: var(--gold);
  border: 1px solid var(--gold); border-radius: 6px; padding: 1px 6px;
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--line);
    padding: 6px 0;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 13px 20px; }
  .nav-links a.btn { margin: 8px 20px; text-align: center; }
  .grid.cols-2, .grid.cols-3 { grid-template-columns: 1fr; }
  .reviews-grid { columns: 1; }
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-list { max-height: none; }
}