:root {
  --blue: #1167d8;
  --green: #1b9a6b;
  --yellow: #f0b429;
  --orange: #ff8d24;
  --orange-strong: #f27600;
  --sky: #e9f2ff;
  --ink: #17233b;
  --muted: #5f6f88;
  --line: #d7dfed;
  --card: #ffffff;
  --radius: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Nunito Sans", "Noto Sans CJK SC", "Noto Sans KR", sans-serif;
  color: var(--ink);
  background: #f8fbff;
}

a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; }

.container {
  width: min(1160px, 94vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  background: #fff;
  border-bottom: 1px solid var(--line);
  z-index: 20;
}

.header-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  justify-content: space-between;
  padding: 0.9rem 0;
}

.brand {
  font-family: "Barlow", sans-serif;
  color: var(--blue);
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.top-nav {
  display: flex;
  gap: 1.2rem;
  color: var(--muted);
  font-weight: 700;
  font-size: 0.95rem;
}

.top-nav a:hover { color: var(--blue); }

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.lang-tab {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 0.3rem 0.6rem;
  font-weight: 800;
  cursor: pointer;
}

.lang-tab.active {
  border-color: var(--blue);
  color: var(--blue);
  background: var(--sky);
}

.btn {
  border-radius: 999px;
  font-weight: 800;
  padding: 0.52rem 0.9rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
}

.btn-outline {
  border-color: var(--blue);
  color: var(--blue);
  background: #fff;
}

.btn-primary {
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
  padding: 0.62rem 1rem;
  cursor: pointer;
}

.hero {
  display: grid;
  grid-template-columns: 1.08fr 1fr;
  gap: 1.25rem;
  margin-top: 1.3rem;
}

.hero-copy {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem;
}

.broker-note {
  margin: 0 0 0.6rem;
  background: var(--sky);
  color: var(--blue);
  border: 1px solid #cde0ff;
  border-radius: 10px;
  padding: 0.5rem 0.65rem;
  font-size: 0.88rem;
  font-weight: 700;
}

.hero-copy h1 {
  margin: 0;
  font-family: "Barlow", sans-serif;
  font-size: clamp(1.8rem, 3.8vw, 2.8rem);
  line-height: 1.05;
}

.hero-campus {
  margin: 0.45rem 0 0;
  color: var(--blue);
  font-weight: 800;
}

.hero-meta {
  margin: 1rem 0;
  padding-left: 1rem;
  color: var(--muted);
  display: grid;
  gap: 0.4rem;
}

.hero-slideshow {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
}

.hero-slideshow img {
  height: 100%;
  min-height: 320px;
  max-height: 360px;
  object-fit: cover;
}

.slide-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  border: 0;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: rgba(23, 35, 59, 0.55);
  color: #fff;
  font-size: 1.3rem;
  cursor: pointer;
}

.slide-btn.prev { left: 10px; }
.slide-btn.next { right: 10px; }

.slide-dots {
  position: absolute;
  bottom: 10px;
  width: 100%;
  display: flex;
  justify-content: center;
  gap: 0.35rem;
}

.slide-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  border: 0;
  background: rgba(255, 255, 255, 0.6);
  cursor: pointer;
}

.slide-dot.active { background: #fff; }

.section {
  margin-top: 2.3rem;
}

.section h2 {
  margin: 0;
  font-family: "Barlow", sans-serif;
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
}

.lead {
  color: var(--muted);
  margin-top: 0.4rem;
  max-width: 78ch;
}

.about-brief {
  display: grid;
  grid-template-columns: 1.08fr 1fr;
  gap: 1.25rem;
  align-items: stretch;
  margin-top: 1.3rem;
}

.about-brief img {
  height: 100%;
  min-height: 320px;
  max-height: 360px;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid var(--line);
}

.about-copy {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 320px;
}

.about-copy p {
  margin: 0.55rem 0 0;
  color: var(--muted);
}

.group-selector {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.65rem;
}

.group-sticky-wrap {
  position: sticky;
  top: 76px;
  z-index: 19;
  background: #f8fbff;
  padding: 0.35rem 0 0.55rem;
}

.group-btn {
  text-align: left;
  border-radius: 12px;
  border: 1px solid transparent;
  background: #fff;
  padding: 0.75rem;
  cursor: pointer;
  font-weight: 800;
  min-height: 230px;
}

.group-btn img {
  height: 130px;
  object-fit: cover;
  border-radius: 10px;
  margin-bottom: 0.6rem;
}

.group-btn small {
  display: block;
  margin-top: 0.15rem;
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.2;
  opacity: 0.9;
}

.group-btn span {
  display: block;
  font-size: 1.25rem;
  line-height: 1.15;
}

.group-btn.nebulas { border-color: #9fc1f8; color: #0b57c2; background: #eaf2ff; }
.group-btn.stars { border-color: #8ed9bf; color: #0f7d57; background: #e9f8f2; }
.group-btn.supernovas { border-color: #f4de9d; color: #9a6b00; background: #fff8df; }
.group-btn.meteors { border-color: #ffc89f; color: #b55400; background: #fff1e6; }

.group-btn.active {
  box-shadow: 0 0 0 2px rgba(17, 103, 216, 0.18);
  transform: translateY(-1px);
}

.pill-tabs {
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.pill-btn {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 0.7rem 1.15rem;
  font-weight: 800;
  font-size: 1rem;
  cursor: pointer;
}

.pill-btn.active {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}

.week-grid {
  margin-top: 0.95rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.weeks-lead {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--ink);
  text-align: center;
  max-width: none;
}

.weeks-group-line {
  display: block;
  margin-top: 0.3rem;
  font-size: 1.7rem;
  line-height: 1.15;
}

.week-tabs {
  justify-content: center;
}

.week-tabs[data-group="nebulas"] .pill-btn {
  border-color: #9fc1f8;
  color: #0b57c2;
  background: #eaf2ff;
}

.week-tabs[data-group="stars"] .pill-btn {
  border-color: #8ed9bf;
  color: #0f7d57;
  background: #e9f8f2;
}

.week-tabs[data-group="supernovas"] .pill-btn {
  border-color: #f4de9d;
  color: #9a6b00;
  background: #fff8df;
}

.week-tabs[data-group="meteors"] .pill-btn {
  border-color: #ffc89f;
  color: #b55400;
  background: #fff1e6;
}

.week-tabs .pill-btn.active {
  color: #fff;
}

.week-tabs[data-group="nebulas"] .pill-btn.active { background: #1167d8; border-color: #1167d8; }
.week-tabs[data-group="stars"] .pill-btn.active { background: #1b9a6b; border-color: #1b9a6b; }
.week-tabs[data-group="supernovas"] .pill-btn.active { background: #d89900; border-color: #d89900; }
.week-tabs[data-group="meteors"] .pill-btn.active { background: #ff8d24; border-color: #ff8d24; }

.week-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.9rem;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.week-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(18, 35, 63, 0.08);
}

#weekGrid[data-group="nebulas"] .week-card {
  background: #eaf2ff;
  border-color: #9fc1f8;
}

#weekGrid[data-group="stars"] .week-card {
  background: #e9f8f2;
  border-color: #8ed9bf;
}

#weekGrid[data-group="supernovas"] .week-card {
  background: #fff8df;
  border-color: #f4de9d;
}

#weekGrid[data-group="meteors"] .week-card {
  background: #fff1e6;
  border-color: #ffc89f;
}

.week-thumb {
  height: 120px;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--line);
  margin-bottom: 0.55rem;
}

.week-card h3 {
  margin: 0.1rem 0 0;
  font-size: 1.02rem;
}

.week-price {
  margin: 0.35rem 0;
  font-weight: 900;
  color: var(--blue);
}

.toggle-details {
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--orange-strong);
  font-weight: 800;
  cursor: pointer;
}

.details-copy {
  max-height: 0;
  overflow: hidden;
  transition: max-height 260ms ease;
  color: var(--muted);
  margin-top: 0.25rem;
  white-space: pre-line;
}

.week-card.expanded .details-copy { max-height: 260px; }

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.price-panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
}

.price-panel h3 { margin: 0; }

.price-panel ul {
  padding-left: 1.1rem;
  color: var(--muted);
}

.note {
  color: var(--muted);
  margin-top: 0.7rem;
}

.faq-list {
  display: grid;
  gap: 0.6rem;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.9rem 1rem;
}

.faq-item h3 {
  margin: 0;
  font-size: 1rem;
}

.faq-item p {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.inquiry-form {
  margin-top: 0.95rem;
  padding: 1rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
}

.inquiry-form label {
  display: grid;
  gap: 0.35rem;
  font-weight: 700;
}

.full-width {
  grid-column: 1 / -1;
}

.inquiry-form input,
.inquiry-form select,
.inquiry-form textarea {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.62rem 0.66rem;
  font: inherit;
}

.site-footer {
  margin-top: 2.3rem;
  border-top: 1px solid var(--line);
  background: #fff;
}

.footer-row {
  padding: 1rem 0 1.5rem;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  flex-wrap: wrap;
}

@media (max-width: 1040px) {
  .top-nav { display: none; }
  .hero,
  .about-brief,
  .pricing-grid,
  .inquiry-form { grid-template-columns: 1fr; }
  .group-selector,
  .week-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
  .group-selector,
  .week-grid { grid-template-columns: 1fr; }
  .hero-slideshow img { min-height: 220px; }
  .full-width { grid-column: auto; }
}