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

body {
  font-family: "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  color: #1a1a1a;
  line-height: 1.6;
  background: #ffffff;
}

a { text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 6vw;
  position: sticky;
  top: 0;
  background: rgba(17, 24, 39, 0.95);
  backdrop-filter: blur(6px);
  z-index: 100;
}

.logo {
  color: #fff;
  font-size: 1.15rem;
  font-weight: 800;
}

.logo span {
  color: #4ade80;
  font-weight: 500;
  font-size: 0.9rem;
  margin-left: 4px;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  color: #d1d5db;
  font-size: 0.92rem;
  font-weight: 500;
}

.nav-links a:hover { color: #4ade80; }

.nav-btn {
  color: #111827;
  background: #4ade80;
  padding: 10px 20px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.88rem;
  white-space: nowrap;
}

/* Hero */
.hero {
  position: relative;
  background: linear-gradient(160deg, #111827 0%, #1f2937 100%);
  color: #ffffff;
  padding: 56px 6vw;
  min-height: 860px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-text {
  position: relative;
  z-index: 2;
  max-width: 600px;
  width: 100%;
  flex-shrink: 0;
}

.eyebrow {
  color: #4ade80;
  font-weight: 700;
  margin-bottom: 18px;
  font-size: 0.95rem;
}

.hero h1 {
  font-size: clamp(1.9rem, 4vw, 2.9rem);
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 24px;
}

.subtitle {
  color: #d1d5db;
  font-size: 1.05rem;
  margin-bottom: 36px;
}

.hero-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.cta-button {
  display: inline-block;
  background: #4ade80;
  color: #111827;
  font-weight: 700;
  padding: 16px 32px;
  border-radius: 999px;
  font-size: 1rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(74, 222, 128, 0.35);
}

.ghost-button {
  display: inline-block;
  border: 1.5px solid #4b5563;
  color: #e5e7eb;
  font-weight: 600;
  padding: 15px 30px;
  border-radius: 999px;
  font-size: 1rem;
}

.ghost-button:hover { border-color: #4ade80; color: #4ade80; }

.stat-row {
  display: flex;
  gap: 36px;
  flex-wrap: wrap;
}

.stat strong {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  color: #4ade80;
}

.stat span {
  font-size: 0.85rem;
  color: #9ca3af;
}

.hero-photo {
  position: absolute;
  right: -10px;
  bottom: 45px;
  width: 560px;
  max-width: 42vw;
  z-index: 1;
}

.hero-photo img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  filter: drop-shadow(0 25px 30px rgba(0, 0, 0, 0.45));
}

/* Section titles */
h2 {
  text-align: center;
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.section-subtitle {
  text-align: center;
  color: #6b7280;
  margin-bottom: 48px;
}

/* Audience */
.audience {
  padding: 80px 6vw 40px;
  max-width: 1100px;
  margin: 0 auto;
}

.audience h2 { margin-bottom: 48px; }

.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.audience-card {
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 28px 22px;
  text-align: center;
}

.feature-icon { font-size: 2rem; margin-bottom: 14px; }

.audience-card p {
  font-weight: 600;
  color: #374151;
  font-size: 0.95rem;
}

/* Curriculum */
.curriculum {
  padding: 100px 6vw;
  max-width: 1160px;
  margin: 0 auto;
}

.curriculum-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.curriculum-card {
  position: relative;
  isolation: isolate;
  background: #ffffff;
  border: 1px solid #eef1ee;
  border-radius: 26px;
  padding: 30px 28px 32px;
  overflow: hidden;
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease, box-shadow 0.25s ease;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.curriculum-card.in-view {
  opacity: 1;
  transform: translateY(0);
}

.curriculum-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(135deg, rgba(74, 222, 128, 0.12), rgba(74, 222, 128, 0) 55%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.curriculum-card:hover {
  box-shadow: 0 22px 44px rgba(15, 23, 42, 0.10);
  transform: translateY(-6px);
  border-color: #d9f7e3;
}

.curriculum-card:hover::before {
  opacity: 1;
}

.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 18px;
}

.card-index {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1;
  color: #eef1ee;
  letter-spacing: -0.02em;
}

.card-icon {
  width: 46px;
  height: 46px;
  border-radius: 15px;
  background: linear-gradient(150deg, #dcfce7, #f0fdf4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  flex-shrink: 0;
}

.tag {
  display: inline-block;
  background: #dcfce7;
  color: #15803d;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.level-badge {
  display: inline-block;
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  color: #6b7280;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
  margin-left: 8px;
}

.curriculum-card h3 {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.curriculum-card p {
  color: #4b5563;
  font-size: 0.92rem;
}

.card-header {
  width: 100%;
  background: none;
  border: none;
  padding: 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  cursor: pointer;
  text-align: left;
  font: inherit;
  color: inherit;
}

.toggle-icon {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: #f0fdf4;
  color: #15803d;
  font-weight: 700;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.2s ease;
}

.curriculum-card.open .toggle-icon {
  transform: rotate(135deg);
  background: #4ade80;
  color: #111827;
}

.card-summary {
  margin-top: 14px;
}

.card-details {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.35s ease, opacity 0.3s ease, margin-top 0.35s ease;
}

.curriculum-card.open .card-details {
  max-height: 320px;
  opacity: 1;
  margin-top: 20px;
}

.meta-row {
  display: flex;
  gap: 14px;
  margin-bottom: 12px;
}

.meta-row span {
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  color: #6b7280;
}

.card-details ul {
  display: grid;
  gap: 8px;
}

.card-details li {
  font-size: 0.9rem;
  color: #374151;
  padding-left: 18px;
  position: relative;
}

.card-details li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #15803d;
  font-weight: 700;
}

.detail-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 18px;
  color: #15803d;
  font-weight: 700;
  font-size: 0.9rem;
  transition: gap 0.2s ease;
}

.detail-link:hover { gap: 10px; }

/* Detail pages */
.detail-hero {
  background: linear-gradient(160deg, #111827 0%, #1f2937 100%);
  color: #fff;
  padding: 56px 6vw 64px;
  text-align: center;
}

.back-link {
  display: inline-block;
  color: #9ca3af;
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.back-link:hover { color: #4ade80; }

.detail-hero h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  font-weight: 800;
  margin: 14px 0;
}

.detail-hero .meta-row {
  justify-content: center;
}

.detail-body {
  max-width: 760px;
  margin: 0 auto;
  padding: 64px 6vw;
}

.detail-body h2 {
  text-align: left;
  margin-top: 40px;
}

.detail-body h2:first-child { margin-top: 0; }

.detail-body p {
  color: #374151;
}

.detail-list {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.detail-list li {
  background: #f8fafc;
  border-left: 4px solid #4ade80;
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 0.95rem;
  color: #374151;
}

/* Philosophy */
.philosophy {
  background: #111827;
  color: #fff;
  padding: 72px 6vw;
  text-align: center;
}

.philosophy blockquote {
  max-width: 700px;
  margin: 0 auto 20px;
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  font-weight: 600;
  line-height: 1.7;
}

.quote-author {
  color: #4ade80;
  font-weight: 600;
  font-size: 0.9rem;
}

/* Section kicker */
.section-kicker {
  display: block;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: #15803d;
  margin-bottom: 12px;
}

.hero ~ * .section-kicker { color: #15803d; }

/* Career timeline */
.career {
  padding: 100px 6vw;
  max-width: 1000px;
  margin: 0 auto;
}

.career .section-subtitle { margin-bottom: 56px; }

.timeline-v2 {
  position: relative;
  padding: 8px 0;
}

.timeline-v2::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, #4ade80 0%, rgba(74, 222, 128, 0.15) 100%);
  transform: translateX(-50%);
}

.tl-item {
  position: relative;
  width: 50%;
  padding: 0 44px 52px;
  box-sizing: border-box;
  opacity: 0;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.tl-item:nth-child(odd) {
  left: 0;
  transform: translateX(-24px);
}

.tl-item:nth-child(even) {
  left: 50%;
  transform: translateX(24px);
}

.tl-item.in-view {
  opacity: 1;
  transform: translateX(0);
}

.tl-dot {
  position: absolute;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 0 6px rgba(74, 222, 128, 0.16);
}

.tl-item:nth-child(odd) .tl-dot { right: -8.5px; }
.tl-item:nth-child(even) .tl-dot { left: -8.5px; }

.tl-card {
  background: #ffffff;
  border-radius: 20px;
  padding: 26px 28px;
  box-shadow: 0 4px 18px rgba(15, 23, 42, 0.06);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.tl-item:nth-child(odd) .tl-card { text-align: right; }

.tl-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 34px rgba(15, 23, 42, 0.10);
}

.tl-year {
  display: inline-block;
  background: #dcfce7;
  color: #15803d;
  font-weight: 800;
  font-size: 0.78rem;
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.tl-card h3 {
  font-size: 1.08rem;
  font-weight: 800;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.tl-card p {
  color: #4b5563;
  font-size: 0.9rem;
}

.tl-card ul {
  margin-top: 12px;
  display: grid;
  gap: 6px;
}

.tl-item:nth-child(odd) .tl-card ul { justify-items: end; }

.tl-card li {
  font-size: 0.85rem;
  color: #4b5563;
  padding-left: 14px;
  position: relative;
  max-width: 100%;
}

.tl-item:nth-child(odd) .tl-card li { padding-left: 0; padding-right: 14px; }

.tl-card li::before {
  content: "–";
  position: absolute;
  left: 0;
  color: #4ade80;
}

.tl-item:nth-child(odd) .tl-card li::before { left: auto; right: 0; }

.edu-columns {
  max-width: 700px;
  margin: 64px auto 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
}

.edu-columns h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 14px;
}

/* Awards */
.awards {
  background: #f0fdf4;
  padding: 80px 6vw;
}

.awards .section-subtitle { margin-bottom: 48px; }

.award-columns {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 36px;
}

.award-columns h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.record-list {
  display: grid;
  gap: 12px;
}

.record-list li {
  background: #ffffff;
  border-radius: 10px;
  padding: 14px 18px;
  font-weight: 600;
  font-size: 0.92rem;
  border-left: 4px solid #4ade80;
}

/* Contact */
.contact-cta {
  padding: 88px 6vw;
  text-align: center;
  background: #111827;
  color: #ffffff;
}

.contact-cta p {
  color: #d1d5db;
  max-width: 600px;
  margin: 0 auto 32px;
}

.contact-info {
  margin-top: 22px !important;
  font-size: 0.9rem;
  color: #9ca3af !important;
}

.inquiry-form {
  max-width: 440px;
  margin: 0 auto 28px;
  display: grid;
  gap: 12px;
}

.inquiry-form input[type="text"],
.inquiry-form textarea {
  width: 100%;
  padding: 13px 16px;
  border-radius: 10px;
  border: 1px solid #374151;
  background: #1f2937;
  color: #fff;
  font-family: inherit;
  font-size: 0.92rem;
}

.inquiry-form input::placeholder,
.inquiry-form textarea::placeholder {
  color: #9ca3af;
}

.inquiry-form button {
  border: none;
  cursor: pointer;
  width: 100%;
}

.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.inquiry-status {
  color: #4ade80;
  font-size: 0.88rem;
  min-height: 20px;
}

.contact-email-link {
  margin-top: 8px;
}

footer {
  text-align: center;
  padding: 28px;
  background: #0b0f19;
  color: #6b7280;
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 720px) {
  .navbar { flex-wrap: wrap; gap: 12px; }
  .nav-links { order: 3; width: 100%; justify-content: center; }
  .hero { flex-direction: column-reverse; text-align: center; padding: 48px 6vw 64px; min-height: 0; display: flex; }
  .hero-buttons { justify-content: center; }
  .stat-row { justify-content: center; }
  .hero-photo { position: static; width: 260px; max-width: 70vw; margin: 0 auto 24px; }

  .timeline-v2::before { left: 8px; }
  .tl-item,
  .tl-item:nth-child(odd),
  .tl-item:nth-child(even) {
    width: 100%;
    left: 0;
    padding: 0 0 40px 36px;
    transform: translateX(0);
  }
  .tl-item.in-view { transform: translateX(0); }
  .tl-item:nth-child(odd) .tl-dot,
  .tl-item:nth-child(even) .tl-dot { left: 0; right: auto; }
  .tl-item:nth-child(odd) .tl-card,
  .tl-item:nth-child(odd) .tl-card ul,
  .tl-item:nth-child(odd) .tl-card li {
    text-align: left;
    justify-items: start;
    padding-left: 14px;
    padding-right: 0;
  }
  .tl-item:nth-child(odd) .tl-card li::before { left: 0; right: auto; }
}