:root {
  --bg: #ffffff;
  --bg-soft: #f4f7f6;
  --bg-muted: #eef3f1;
  --ink: #1c2421;
  --ink-soft: #4a5752;
  --ink-faint: #7a8782;
  --line: #d8e2de;
  --accent: #1a6b5c;
  --accent-hover: #145548;
  --accent-soft: #e4f2ee;
  --accent-mid: #3d9a86;
  --warm: #c4893a;
  --warm-soft: #faf3e8;
  --danger: #b33a3a;
  --success: #1a6b5c;
  --radius: 4px;
  --radius-lg: 12px;
  --shadow: 0 12px 40px rgba(28, 36, 33, 0.06);
  --font-display: "Gowun Batang", "Noto Serif KR", serif;
  --font-body: "Noto Sans KR", sans-serif;
  --max: 1120px;
  --header-h: 72px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--accent-hover);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
  margin: 0 0 0.6em;
}

h1 { font-size: clamp(2rem, 4.5vw, 3.15rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.55rem, 3vw, 2.15rem); letter-spacing: -0.015em; }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1em; color: var(--ink-soft); }

.container {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  height: var(--header-h);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
}

.brand:hover { color: var(--ink); }

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 0.75rem;
  font-family: var(--font-body);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.15rem 1.35rem;
}

.nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--accent);
}

.nav-cta {
  margin-left: 0.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.35rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-warm {
  background: var(--warm-soft);
  color: #8a5a18;
  border-color: #edd9b5;
}

.btn-warm:hover {
  background: #f3e6d0;
  color: #6e4712;
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.45rem 0.7rem;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--ink);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 4.5rem 0 5rem;
  background:
    radial-gradient(ellipse 80% 60% at 90% 10%, rgba(61, 154, 134, 0.12), transparent 55%),
    radial-gradient(ellipse 50% 40% at 5% 90%, rgba(196, 137, 58, 0.08), transparent 50%),
    linear-gradient(180deg, #f7faf9 0%, #ffffff 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 3.5rem;
  align-items: end;
}

.hero-kicker {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-mid);
  margin-bottom: 1rem;
}

.hero h1 {
  margin-bottom: 1rem;
}

.hero-lead {
  font-size: 1.08rem;
  max-width: 34rem;
  margin-bottom: 1.75rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.hero-meta strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.45rem;
  color: var(--ink);
  line-height: 1.2;
}

.hero-meta span {
  font-size: 0.85rem;
  color: var(--ink-faint);
}

.hero-visual {
  position: relative;
}

.hero-visual img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: auto -12px -12px auto;
  width: 42%;
  height: 42%;
  background: var(--accent-soft);
  border-radius: var(--radius-lg);
  z-index: -1;
  animation: drift 8s ease-in-out infinite alternate;
}

@keyframes drift {
  from { transform: translate(0, 0); }
  to { transform: translate(8px, -10px); }
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  animation: fade-up 0.7s ease both;
}

.reveal-delay { animation-delay: 0.15s; }
.reveal-delay-2 { animation-delay: 0.3s; }

.section {
  padding: 4.5rem 0;
}

.section-soft { background: var(--bg-soft); }

.section-head {
  max-width: 38rem;
  margin-bottom: 2.5rem;
}

.section-head.center {
  text-align: center;
  margin-inline: auto;
}

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--warm);
  margin-bottom: 0.6rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}

.feature {
  padding: 0.25rem 0;
}

.feature-num {
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--accent-mid);
  margin-bottom: 0.75rem;
}

.feature h3 { margin-bottom: 0.5rem; }

.course-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
  color: inherit;
  transition: transform 0.25s ease;
}

.course-card:hover {
  transform: translateY(-4px);
  color: inherit;
}

.course-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: 1rem;
}

.course-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.4rem;
  text-decoration: none;
}

.course-card p {
  font-size: 0.95rem;
  flex: 1;
}

.course-meta {
  font-size: 0.82rem;
  color: var(--ink-faint);
  margin-top: 0.75rem;
}

.strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  padding: 2.25rem 0;
  border-block: 1px solid var(--line);
}

.strip-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.8rem;
  color: var(--accent);
  line-height: 1.15;
  margin-bottom: 0.25rem;
}

.strip-item span {
  font-size: 0.88rem;
  color: var(--ink-faint);
}

.quote-block {
  padding: 2rem 0;
  border-top: 1px solid var(--line);
}

.quote-block blockquote {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.4vw, 1.55rem);
  line-height: 1.55;
  color: var(--ink);
}

.quote-block cite {
  font-style: normal;
  font-size: 0.9rem;
  color: var(--ink-faint);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  align-items: stretch;
}

.pricing-grid.tiers-4 {
  grid-template-columns: repeat(4, 1fr);
}

.price-tier {
  padding: 2rem 1.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--bg);
  display: flex;
  flex-direction: column;
}

.price-tier.featured {
  border-color: var(--accent);
  background: linear-gradient(180deg, var(--accent-soft) 0%, #fff 45%);
  box-shadow: var(--shadow);
}

.price-tier h3 {
  font-size: 1.2rem;
  margin-bottom: 0.35rem;
}

.price-amount {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--ink);
  margin: 1rem 0 0.35rem;
}

.price-amount small {
  font-size: 0.95rem;
  color: var(--ink-faint);
  font-family: var(--font-body);
  font-weight: 400;
}

.price-tier ul {
  list-style: none;
  padding: 0;
  margin: 1.25rem 0 1.75rem;
  flex: 1;
}

.price-tier li {
  position: relative;
  padding: 0.4rem 0 0.4rem 1.2rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.price-tier li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-mid);
}

.review-grid {
  display: grid;
  gap: 1.5rem;
}

.review {
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--line);
}

.review:last-child { border-bottom: none; }

.review-rating {
  color: var(--warm);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.6rem;
}

.review p {
  font-size: 1.02rem;
  color: var(--ink);
}

.review-attr {
  font-size: 0.88rem;
  color: var(--ink-faint);
  margin-top: 0.75rem;
}

.case-study {
  background: var(--bg-soft);
  padding: 2rem;
  border-radius: var(--radius-lg);
  margin-top: 1.5rem;
}

.blog-list {
  display: grid;
  gap: 2rem;
}

.blog-item {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 1.75rem;
  text-decoration: none;
  color: inherit;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--line);
  transition: opacity 0.2s ease;
}

.blog-item:hover {
  opacity: 0.88;
  color: inherit;
}

.blog-item img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
}

.blog-item time {
  font-size: 0.82rem;
  color: var(--ink-faint);
}

.prose {
  max-width: 42rem;
}

.prose h2 { margin-top: 2.25rem; }
.prose h3 { margin-top: 1.75rem; }
.prose ul, .prose ol { color: var(--ink-soft); padding-left: 1.25rem; }
.prose li { margin-bottom: 0.4rem; }
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

.prose th,
.prose td {
  border: 1px solid var(--line);
  padding: 0.65rem 0.85rem;
  text-align: left;
  vertical-align: top;
}

.prose th {
  background: var(--bg-soft);
  color: var(--ink);
  font-weight: 600;
}

.page-hero {
  padding: 3.5rem 0 2.5rem;
  background:
    linear-gradient(135deg, var(--bg-soft) 0%, #fff 60%);
  border-bottom: 1px solid var(--line);
}

.page-hero h1 { margin-bottom: 0.75rem; }
.page-hero p { max-width: 36rem; font-size: 1.05rem; }

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 0.85fr;
  gap: 3rem;
  align-items: start;
}

.form-group {
  margin-bottom: 1.15rem;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--ink);
}

.form-group .optional {
  font-weight: 400;
  color: var(--ink-faint);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink);
  background: #fff;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(26, 107, 92, 0.12);
}

.form-group textarea { min-height: 140px; resize: vertical; }

.field-error {
  display: none;
  color: var(--danger);
  font-size: 0.82rem;
  margin-top: 0.35rem;
}

.form-group.has-error input,
.form-group.has-error select,
.form-group.has-error textarea {
  border-color: var(--danger);
}

.form-group.has-error .field-error { display: block; }

.form-status {
  display: none;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-size: 0.92rem;
}

.form-status.success {
  display: block;
  background: var(--accent-soft);
  color: var(--success);
}

.form-status.error {
  display: block;
  background: #fceaea;
  color: var(--danger);
}

.contact-aside {
  background: var(--bg-soft);
  padding: 1.75rem;
  border-radius: var(--radius-lg);
}

.contact-aside h2 {
  font-size: 1.15rem;
  margin-bottom: 1rem;
}

.contact-aside dl {
  margin: 0;
}

.contact-aside dt {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 1rem;
}

.contact-aside dd {
  margin: 0.25rem 0 0;
  color: var(--ink);
  font-size: 0.95rem;
}

.modules {
  display: grid;
  gap: 1rem;
}

.module {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.module-num {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--accent-mid);
}

.faq details {
  border-bottom: 1px solid var(--line);
  padding: 1rem 0;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ink);
  list-style: none;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::after {
  content: "+";
  float: right;
  color: var(--accent);
  font-weight: 400;
}

.faq details[open] summary::after { content: "−"; }

.faq details p {
  margin: 0.75rem 0 0.25rem;
  font-size: 0.95rem;
}

.instructor {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1.5rem;
  align-items: center;
  padding: 1.5rem;
  background: var(--bg-soft);
  border-radius: var(--radius-lg);
}

.instructor img {
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: 50%;
}

.site-footer {
  background: var(--ink);
  color: #c5ceca;
  padding: 3.5rem 0 2rem;
  margin-top: 2rem;
}

.site-footer a {
  color: #dce5e1;
  text-decoration: none;
}

.site-footer a:hover { color: #fff; }

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: #fff;
  margin-bottom: 0.75rem;
}

.footer-grid h3 {
  color: #fff;
  font-size: 0.85rem;
  font-family: var(--font-body);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.footer-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-grid li { margin-bottom: 0.5rem; font-size: 0.92rem; }

.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.85rem;
}

.cookie-banner {
  position: fixed;
  bottom: 1.25rem;
  left: 1.25rem;
  right: 1.25rem;
  z-index: 200;
  max-width: 520px;
  margin-right: auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.35rem;
  display: none;
}

.cookie-banner.is-visible { display: block; animation: fade-up 0.35s ease; }

.cookie-banner p {
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.cookie-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.inline-error {
  background: #fceaea;
  color: var(--danger);
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  margin: 0.5rem 0;
}

.not-found {
  min-height: 60vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 4rem 1.5rem;
}

.not-found .code {
  font-family: var(--font-display);
  font-size: 5rem;
  color: var(--accent-soft);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.flow-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  counter-reset: step;
}

.flow-step {
  position: relative;
  padding-top: 0.5rem;
}

.flow-step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  display: block;
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.media-cover {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin: 1.5rem 0 2rem;
}

@media (max-width: 960px) {
  .hero-grid,
  .contact-layout,
  .blog-item,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .grid-3,
  .pricing-grid,
  .pricing-grid.tiers-4,
  .flow-steps {
    grid-template-columns: 1fr;
  }

  .grid-2 { grid-template-columns: 1fr; }

  .strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .menu-toggle { display: inline-flex; }

  .nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 1rem 1.25rem 1.25rem;
    gap: 0.25rem;
  }

  .nav.is-open { display: flex; }

  .nav a {
    padding: 0.65rem 0.25rem;
  }

  .nav-cta {
    margin: 0.5rem 0 0;
  }

  .nav-cta .btn { width: 100%; }

  .instructor {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
  }
}

@media (max-width: 560px) {
  .strip { grid-template-columns: 1fr; }
  .hero { padding: 3rem 0 3.5rem; }
  .section { padding: 3.25rem 0; }
}