@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@400;500;700;900&family=Playfair+Display:wght@700;900&display=swap');

:root {
  --gold: #c6963c;
  --gold-dark: #a87927;
  --gold-light: #f3e2ba;
  --steel: #5c7a99;
  --steel-dark: #3d5670;
  --navy: #1b2436;
  --navy-light: #2c3b57;
  --cream: #fbf7ef;
  --cream-dark: #f2ead9;
  --ink: #26241e;
  --ink-soft: #5c584c;
  --white: #ffffff;
  --radius: 18px;
  --shadow: 0 10px 30px rgba(27, 36, 54, 0.08);
  --shadow-strong: 0 16px 40px rgba(27, 36, 54, 0.16);
  --max-width: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Malgun Gothic', sans-serif;
  color: var(--ink);
  background: var(--cream);
  line-height: 1.65;
  overflow-x: hidden;
}

h1, h2, h3, h4 { margin: 0; font-weight: 900; letter-spacing: -0.01em; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
img, svg { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

.serif { font-family: 'Playfair Display', 'Noto Sans KR', serif; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold-dark);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.eyebrow::before {
  content: '';
  width: 22px;
  height: 2px;
  background: var(--gold);
  display: inline-block;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 247, 239, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(27, 36, 54, 0.06);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  font-size: 1.25rem;
  color: var(--navy);
}
.brand small {
  display: block;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--gold-dark);
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}
.main-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--navy);
  position: relative;
  padding: 6px 0;
}
.main-nav a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transition: transform 0.25s ease;
}
.main-nav a:hover::after { transform: scaleX(1); }

.header-actions { display: flex; align-items: center; gap: 10px; }

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  width: 22px; height: 2px;
  background: var(--navy);
  border-radius: 2px;
  transition: all 0.25s ease;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--navy);
  color: var(--white);
  box-shadow: var(--shadow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-strong); }
.btn-outline {
  background: transparent;
  color: var(--navy);
  border: 1.5px solid rgba(27,36,54,0.25);
}
.btn-outline:hover { border-color: var(--navy); }
.btn-kakao {
  background: #fee500;
  color: #391b1b;
}
.btn-kakao:hover { transform: translateY(-2px); box-shadow: var(--shadow-strong); }
.btn-sm { padding: 9px 18px; font-size: 0.85rem; }
.btn-block { width: 100%; }
.btn svg { width: 18px; height: 18px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 84px 0 100px;
  background:
    radial-gradient(circle at 85% 10%, rgba(198,150,60,0.16), transparent 45%),
    radial-gradient(circle at 5% 90%, rgba(92,122,153,0.14), transparent 45%),
    var(--navy);
  color: var(--white);
  overflow: hidden;
}
.hero .wrap {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.1rem, 4vw, 3.2rem);
  line-height: 1.25;
  color: var(--white);
}
.hero h1 span { color: var(--gold); }
.hero p.lead {
  margin-top: 20px;
  font-size: 1.08rem;
  color: rgba(255,255,255,0.78);
  max-width: 480px;
}
.hero-actions {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.hero-stats {
  margin-top: 44px;
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}
.hero-stats div strong {
  display: block;
  font-size: 1.5rem;
  color: var(--gold-light);
  font-weight: 900;
}
.hero-stats div span {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.6);
}
.hero-art {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-art .glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, rgba(198,150,60,0.35), transparent 65%);
  filter: blur(20px);
}
.hero-art .photo-frame {
  position: relative;
  width: 100%;
  max-width: 420px;
  aspect-ratio: 4 / 3.4;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-strong);
  border: 1px solid rgba(198,150,60,0.4);
}
.hero-art .photo-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 35%;
}

/* ---------- Section base ---------- */
section { padding: 96px 0; }
.section-head {
  max-width: 620px;
  margin: 0 auto 56px;
  text-align: center;
}
.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  color: var(--navy);
}
.section-head p {
  margin-top: 14px;
  color: var(--ink-soft);
  font-size: 1.02rem;
}
.section-alt { background: var(--white); }

/* ---------- About / instructors ---------- */
.instructor-grid {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.instructor-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  border-top: 4px solid var(--gold);
  transition: transform 0.25s ease;
}
.instructor-card.trombone { border-top-color: var(--steel); }
.instructor-card:hover { transform: translateY(-6px); }
.instructor-info { min-width: 0; }
.instructor-visual {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: linear-gradient(150deg, var(--gold-light), var(--gold));
}
.instructor-card.trombone .instructor-visual {
  background: linear-gradient(150deg, #dce8f2, var(--steel));
}
.instructor-visual img, .instructor-visual svg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}
.instructor-visual img { filter: grayscale(12%) contrast(1.05) saturate(1.05); }
.instructor-visual::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(27,36,54,0.5));
  pointer-events: none;
}
.instructor-card h3 { font-size: 1.3rem; color: var(--navy); }
.instructor-role {
  display: inline-block;
  margin: 8px 0 16px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--gold-dark);
  letter-spacing: 0.06em;
}
.instructor-card.trombone .instructor-role { color: var(--steel-dark); }
.instructor-card p.bio { color: var(--ink-soft); font-size: 0.96rem; }
.instructor-card p.bio-quote {
  font-style: italic;
  color: var(--gold-dark);
  font-weight: 700;
  font-size: 0.92rem;
  margin-bottom: 12px;
}
.instructor-card.trombone p.bio-quote { color: var(--steel-dark); }
.instructor-card .btn { margin-top: 22px; }
.career {
  margin-top: 18px;
  padding: 20px 22px;
  background: var(--cream-dark);
  border-radius: 14px;
  border-top: 3px solid var(--gold);
}
.instructor-card.trombone .career { border-top-color: var(--steel); }
.career-title {
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold-dark);
  margin-bottom: 14px;
}
.instructor-card.trombone .career-title { color: var(--steel-dark); }
.career-group { margin-bottom: 14px; }
.career-group:last-child { margin-bottom: 0; }
.career-group h5 {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 7px;
}
.career-group ul { display: flex; flex-direction: column; gap: 4px; }
.career-group ul li {
  font-size: 0.87rem;
  color: var(--ink-soft);
  padding-left: 15px;
  position: relative;
  line-height: 1.5;
}
.career-group ul li::before {
  content: '';
  position: absolute;
  left: 0; top: 8px;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--gold);
}
.instructor-card.trombone .career-group ul li::before { background: var(--steel); }
.bio-note {
  margin-top: 36px;
  font-size: 0.78rem;
  color: var(--ink-soft);
  opacity: 0.7;
  text-align: center;
}

/* ---------- Curriculum ---------- */
.tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 44px;
}
.program-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.program-btn {
  padding: 8px 20px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.86rem;
  background: transparent;
  color: var(--ink-soft);
  border: 1.5px solid rgba(27,36,54,0.16);
}
.program-btn.active {
  background: var(--gold);
  color: #fff;
  border-color: var(--gold);
}
.tab-panel[data-tab="trombone"] .program-btn.active { background: var(--steel); border-color: var(--steel); }
.program-panel { display: none; }
.program-panel.active { display: block; animation: fadeIn 0.3s ease; }
.tab-btn {
  padding: 12px 28px;
  border-radius: 999px;
  font-weight: 700;
  background: var(--cream-dark);
  color: var(--ink-soft);
  transition: all 0.2s ease;
}
.tab-btn.active {
  background: var(--navy);
  color: var(--white);
}
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.35s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px);} to { opacity: 1; transform: translateY(0);} }

.curriculum-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}
.step-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 30px 26px;
  box-shadow: var(--shadow);
  position: relative;
}
.step-tag {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--gold-light);
  color: var(--gold-dark);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  margin-bottom: 16px;
}
.tab-panel[data-tab="trombone"] .step-tag { background: #dce8f2; color: var(--steel-dark); }
.step-card h4 { font-size: 1.08rem; color: var(--navy); margin-bottom: 10px; }
.step-card p { color: var(--ink-soft); font-size: 0.92rem; }
.step-card ul { margin-top: 12px; }
.step-card ul li {
  font-size: 0.88rem;
  color: var(--ink-soft);
  padding-left: 16px;
  position: relative;
  margin-bottom: 6px;
}
.step-card ul li::before {
  content: '';
  position: absolute; left: 0; top: 9px;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--gold);
}
.tab-panel[data-tab="trombone"] .step-card ul li::before { background: var(--steel); }

.info-bar {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  background: var(--navy);
  border-radius: var(--radius);
  padding: 32px;
  color: var(--white);
}
.info-bar div { text-align: center; }
.info-bar strong { display: block; font-size: 1.1rem; color: var(--gold-light); margin-bottom: 4px; }
.info-bar span { font-size: 0.82rem; color: rgba(255,255,255,0.7); }

/* ---------- FAQ ---------- */
.faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--white);
  border-radius: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 26px;
  text-align: left;
  font-weight: 700;
  color: var(--navy);
}
.faq-q .qmark {
  color: var(--gold-dark);
  font-family: 'Playfair Display', serif;
  font-size: 1.1rem;
}
.faq-q .chev {
  width: 20px; height: 20px;
  flex-shrink: 0;
  transition: transform 0.25s ease;
  color: var(--ink-soft);
}
.faq-item.open .faq-q .chev { transform: rotate(180deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.faq-a p {
  padding: 0 26px 22px 26px;
  color: var(--ink-soft);
  font-size: 0.94rem;
  white-space: pre-line;
}

/* ---------- Location ---------- */
.location-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.location-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px;
}
.location-card .addr {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 8px;
}
.location-card .transit {
  color: var(--ink-soft);
  font-size: 0.94rem;
  margin-bottom: 22px;
}
.location-card .transit strong { color: var(--gold-dark); }
.location-links { display: flex; gap: 10px; flex-wrap: wrap; }
.map-art {
  background: var(--cream-dark);
  border-radius: var(--radius);
  aspect-ratio: 4/3.2;
  display: flex; align-items: center; justify-content: center;
  position: relative;
  overflow: hidden;
}
.map-art svg { width: 70%; }

/* ---------- Contact / kakao section ---------- */
.contact-cta {
  background: linear-gradient(135deg, var(--navy), var(--navy-light));
  border-radius: 28px;
  padding: 56px 40px;
  text-align: center;
  color: var(--white);
}
.contact-cta h2 { color: var(--white); font-size: clamp(1.5rem, 3vw, 2rem); }
.contact-cta p { color: rgba(255,255,255,0.72); margin-top: 12px; }
.contact-choices {
  margin-top: 36px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 640px;
  margin-left: auto; margin-right: auto;
}
.contact-choice {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 16px;
  padding: 26px;
}
.contact-choice h4 { color: var(--gold-light); font-size: 1.05rem; margin-bottom: 6px; }
.contact-choice p { font-size: 0.85rem; color: rgba(255,255,255,0.65); margin-bottom: 18px; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(255,255,255,0.6);
  padding: 40px 0;
  font-size: 0.85rem;
}
.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Sticky mobile bar ---------- */
.sticky-cta {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 90;
  display: none;
  background: var(--white);
  box-shadow: 0 -8px 24px rgba(0,0,0,0.1);
  padding: 10px 14px;
  gap: 10px;
}
.sticky-cta .btn { flex: 1; }

/* ---------- Board page ---------- */
.board-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.board-mode-banner {
  background: var(--gold-light);
  color: var(--gold-dark);
  border-radius: 12px;
  padding: 12px 18px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 24px;
}
.board-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 48px;
}
.board-item {
  background: var(--white);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 20px 24px;
}
.board-item-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}
.board-item-title { font-weight: 700; color: var(--navy); display: flex; align-items: center; gap: 10px; }
.tag {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--gold-light);
  color: var(--gold-dark);
}
.tag.trombone { background: #dce8f2; color: var(--steel-dark); }
.board-item-meta { font-size: 0.78rem; color: var(--ink-soft); display: flex; gap: 10px; align-items: center; }
.board-item-body {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed rgba(27,36,54,0.12);
  color: var(--ink-soft);
  font-size: 0.92rem;
  white-space: pre-line;
  display: none;
}
.board-item.open .board-item-body { display: block; }
.board-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--ink-soft);
  background: var(--white);
  border-radius: var(--radius);
}

.board-form {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px;
}
.form-row { margin-bottom: 18px; }
.form-row label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 8px;
}
.form-row input,
.form-row textarea,
.form-row select {
  width: 100%;
  padding: 13px 16px;
  border-radius: 10px;
  border: 1.5px solid rgba(27,36,54,0.14);
  font-family: inherit;
  font-size: 0.95rem;
  background: var(--cream);
  color: var(--ink);
}
.form-row input:focus,
.form-row textarea:focus,
.form-row select:focus {
  outline: none;
  border-color: var(--gold);
}
.form-row textarea { resize: vertical; min-height: 120px; }
.form-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-check { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; color: var(--ink-soft); }
.form-check input { width: auto; }
.form-note { font-size: 0.78rem; color: var(--ink-soft); margin-top: 10px; }
.form-status { margin-top: 14px; font-size: 0.88rem; font-weight: 700; display: none; }
.form-status.show { display: block; }
.form-status.ok { color: #2f7a4d; }
.form-status.err { color: #b3452c; }

/* ---------- Responsive ---------- */
@media (max-width: 880px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .main-nav.open {
    display: flex;
    position: absolute;
    top: 72px; left: 0; right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 20px 24px 28px;
    gap: 18px;
    box-shadow: var(--shadow);
  }
  .header-actions .btn span.long { display: none; }
  .hero .wrap { grid-template-columns: 1fr; text-align: center; }
  .hero p.lead { margin-left: auto; margin-right: auto; }
  .hero-actions, .hero-stats { justify-content: center; }
  .hero-art { order: -1; max-width: 420px; margin: 0 auto; }
  .instructor-card { grid-template-columns: 1fr; }
  .curriculum-steps { grid-template-columns: 1fr; }
  .info-bar { grid-template-columns: 1fr 1fr; }
  .location-grid { grid-template-columns: 1fr; }
  .contact-choices { grid-template-columns: 1fr; }
  .form-grid-2 { grid-template-columns: 1fr; }
  section { padding: 64px 0; }
  .sticky-cta { display: flex; }
  body { padding-bottom: 70px; }
}

@media (max-width: 520px) {
  .info-bar { grid-template-columns: 1fr 1fr; }
  .board-item-head { flex-wrap: wrap; }
}