:root {
  --bg: #fafcfb;
  --bg-soft: #f0f6f4;
  --surface: #ffffff;
  --ink: #1c2b28;
  --ink-muted: #5a6e69;
  --accent: #1a5c52;
  --accent-soft: #7ec8b8;
  --accent-wash: #e4f3ef;
  --line: #d5e3df;
  --error: #b42318;
  --success: #0f6b4c;
  --radius: 4px;
  --shadow: 0 12px 40px rgba(26, 92, 82, 0.08);
  --font-display: "Noto Serif KR", "Source Han Serif KR", Georgia, serif;
  --font-body: "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;
  --space: clamp(1rem, 2vw, 1.5rem);
  --max: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--ink);
  background:
    radial-gradient(ellipse 80% 50% at 100% -10%, rgba(126, 200, 184, 0.18), transparent 55%),
    radial-gradient(ellipse 60% 40% at 0% 100%, rgba(26, 92, 82, 0.06), transparent 50%),
    var(--bg);
  min-height: 100vh;
}

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

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: #0f3f38;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.02em;
  margin: 0 0 0.6em;
}

p {
  margin: 0 0 1em;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(250, 252, 251, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.25rem;
  gap: 1rem;
}

.brand {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.03em;
}

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

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.15rem;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--ink-muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
}

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

.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius);
}

.nav-cta:hover {
  background: #0f3f38;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 0.4rem;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
}

main {
  overflow-x: clip;
}

.hero {
  position: relative;
  min-height: min(88vh, 760px);
  display: grid;
  align-items: end;
  padding: 4rem 0 3.5rem;
  background:
    linear-gradient(120deg, rgba(26, 43, 40, 0.72) 0%, rgba(26, 92, 82, 0.45) 55%, rgba(26, 43, 40, 0.25) 100%),
    url("https://images.unsplash.com/photo-1551288049-bebda4e38f71?auto=format&fit=crop&w=1800&q=80") center/cover no-repeat;
  color: #f7fffc;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  margin-bottom: 0.35em;
  animation: rise 0.9s ease both;
}

.hero-lead {
  max-width: 34rem;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: rgba(247, 255, 252, 0.9);
  margin-bottom: 1.5rem;
  animation: rise 0.9s ease 0.12s both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  animation: rise 0.9s ease 0.22s both;
}

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

.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: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent-soft);
  color: #0f2f2a;
}

.btn-primary:hover {
  background: #a8ddd1;
  color: #0f2f2a;
}

.btn-ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.55);
  color: #fff;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

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

.btn-solid:hover {
  background: #0f3f38;
  color: #fff;
}

.btn-outline {
  background: transparent;
  border-color: var(--accent);
  color: var(--accent);
}

.btn-outline:hover {
  background: var(--accent-wash);
}

.section {
  padding: clamp(3.5rem, 7vw, 5.5rem) 0;
}

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

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.35rem);
  max-width: 22ch;
}

.section-intro {
  color: var(--ink-muted);
  max-width: 42rem;
  margin-bottom: 2rem;
}

.proof-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--line);
}

.proof-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.85rem;
  color: var(--accent);
}

.proof-item span {
  color: var(--ink-muted);
  font-size: 0.92rem;
}

.feature-course {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: center;
}

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

.benefit-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.benefit-list h3 {
  font-size: 1.2rem;
  margin-bottom: 0.4rem;
}

.benefit-list p {
  color: var(--ink-muted);
  margin: 0;
  font-size: 0.98rem;
}

.benefit-list li {
  padding-top: 1rem;
  border-top: 2px solid var(--accent-soft);
}

.quote-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.5rem;
}

.quote {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1.75rem;
  margin: 0;
}

.quote p {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 1rem;
}

.quote footer {
  color: var(--ink-muted);
  font-size: 0.9rem;
}

.quote-short {
  align-self: start;
}

.quote-short p {
  font-size: 1rem;
  font-family: var(--font-body);
}

.blog-preview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.blog-card {
  text-decoration: none;
  color: inherit;
  display: block;
  transition: transform 0.25s ease;
}

.blog-card:hover {
  transform: translateY(-4px);
}

.blog-card img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  margin-bottom: 0.85rem;
  border-radius: var(--radius);
}

.blog-card h3 {
  font-size: 1.1rem;
  color: var(--ink);
}

.blog-card p {
  color: var(--ink-muted);
  font-size: 0.92rem;
  margin: 0;
}

.cta-band {
  background: linear-gradient(135deg, var(--accent) 0%, #246b60 100%);
  color: #fff;
  padding: 3.5rem 0;
  text-align: center;
}

.cta-band h2 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
}

.cta-band p {
  color: rgba(255, 255, 255, 0.88);
  max-width: 34rem;
  margin: 0 auto 1.5rem;
}

.page-hero {
  padding: 3.5rem 0 2rem;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(180deg, var(--accent-wash), transparent);
}

.page-hero h1 {
  font-size: clamp(2rem, 4vw, 2.85rem);
  max-width: 18ch;
}

.page-hero p {
  color: var(--ink-muted);
  max-width: 40rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.75rem;
}

.course-card {
  background: var(--surface);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: box-shadow 0.25s ease;
}

.course-card:hover {
  box-shadow: var(--shadow);
}

.course-card img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
}

.course-card-body {
  padding: 1.25rem 1.35rem 1.5rem;
}

.course-card h2,
.course-card h3 {
  font-size: 1.2rem;
}

.course-card p {
  color: var(--ink-muted);
  font-size: 0.95rem;
}

.meta {
  font-size: 0.85rem;
  color: var(--ink-muted);
  margin-bottom: 0.5rem;
}

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

.price-tier {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
}

.price-tier.featured {
  border-color: var(--accent);
  background: var(--accent-wash);
  transform: translateY(-8px);
}

.price-tier h2 {
  font-size: 1.35rem;
}

.price-amount {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--accent);
  margin: 0.5rem 0 1rem;
}

.price-tier ul {
  margin: 0 0 1.5rem;
  padding-left: 1.1rem;
  color: var(--ink-muted);
  flex: 1;
}

.price-tier li {
  margin-bottom: 0.45rem;
}

.price-note {
  font-size: 0.88rem;
  color: var(--ink-muted);
  margin-top: 1.5rem;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

.prose {
  max-width: 42rem;
}

.prose h2 {
  margin-top: 2rem;
  font-size: 1.45rem;
}

.prose h3 {
  margin-top: 1.5rem;
  font-size: 1.15rem;
}

.prose ul,
.prose ol {
  padding-left: 1.2rem;
  color: var(--ink-muted);
}

.prose li {
  margin-bottom: 0.4rem;
}

.instructor {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1.25rem;
  align-items: center;
  margin: 2rem 0;
}

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

.modules {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem;
}

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

.modules strong {
  display: block;
  margin-bottom: 0.25rem;
}

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

.faq summary {
  cursor: pointer;
  font-weight: 600;
}

.faq details p {
  color: var(--ink-muted);
  margin: 0.75rem 0 0;
}

.form {
  display: grid;
  gap: 1rem;
  max-width: 36rem;
}

.form-row {
  display: grid;
  gap: 0.35rem;
}

.form label {
  font-weight: 600;
  font-size: 0.92rem;
}

.form input,
.form select,
.form textarea {
  font: inherit;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
}

.form input:focus,
.form select:focus,
.form textarea:focus {
  outline: 2px solid var(--accent-soft);
  border-color: var(--accent);
}

.field-error {
  color: var(--error);
  font-size: 0.85rem;
  min-height: 1.2em;
}

.form-status {
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  display: none;
}

.form-status.success {
  display: block;
  background: #e8f6ef;
  color: var(--success);
}

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

.contact-aside {
  background: var(--bg-soft);
  padding: 1.5rem;
  border: 1px solid var(--line);
}

.contact-aside h2 {
  font-size: 1.2rem;
}

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

.review-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}

.review-item .rating {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
}

.case-study {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1.75rem;
  margin-top: 2rem;
}

.case-study h3 {
  font-size: 1.3rem;
}

.table-wrap {
  overflow-x: auto;
  margin: 1.5rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th,
td {
  border: 1px solid var(--line);
  padding: 0.65rem 0.75rem;
  text-align: left;
}

th {
  background: var(--bg-soft);
}

.site-footer {
  background: #152522;
  color: rgba(255, 255, 255, 0.78);
  padding: 3.5rem 0 1.5rem;
  margin-top: 0;
}

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

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: #fff;
  margin-bottom: 0.4rem;
}

.footer-tag {
  font-size: 0.9rem;
}

.footer-heading {
  color: #fff;
  font-weight: 600;
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--accent-soft);
}

.footer-contact p {
  font-size: 0.88rem;
  margin-bottom: 0.5rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 1.25rem;
  font-size: 0.85rem;
}

.cookie-banner {
  position: fixed;
  bottom: 1rem;
  left: 1rem;
  right: 1rem;
  z-index: 60;
  max-width: 520px;
  margin-inline: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.35rem;
  display: none;
}

.cookie-banner.is-visible {
  display: block;
  animation: rise 0.4s ease both;
}

.cookie-banner p {
  font-size: 0.92rem;
  color: var(--ink-muted);
  margin-bottom: 1rem;
}

.cookie-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

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

.not-found {
  min-height: 60vh;
  display: grid;
  place-content: center;
  text-align: center;
  padding: 3rem 1rem;
}

.not-found h1 {
  font-size: clamp(3rem, 10vw, 5rem);
  color: var(--accent);
  margin-bottom: 0.2em;
}

.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  margin: 2rem 0;
}

.stat-row div {
  min-width: 8rem;
}

.stat-row strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--accent);
}

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 1.25rem 1.25rem;
    gap: 0.75rem;
  }

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

  .proof-bar,
  .benefit-list,
  .blog-preview,
  .price-grid,
  .feature-course,
  .quote-grid,
  .split,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .price-tier.featured {
    transform: none;
  }

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