:root {
  --bg: #ffffff;
  --bg-soft: #f4f7f6;
  --ink: #1c2423;
  --muted: #5d6b68;
  --line: #dde5e2;
  --accent: #2f6f6a;
  --accent-soft: #e8f4f2;
  --accent-deep: #1f4f4b;
  --warn: #9b4d3c;
  --ok: #2a6b4f;
  --radius: 10px;
  --shadow: 0 18px 40px rgba(28, 36, 35, 0.06);
  --font-display: "Noto Serif KR", "Georgia", serif;
  --font-body: "Noto Sans KR", "Helvetica Neue", 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);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 1rem;
  min-height: 100vh;
}

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

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

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

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  line-height: 1.25;
  font-weight: 600;
  margin: 0 0 0.6em;
  letter-spacing: -0.02em;
}

p {
  margin: 0 0 1em;
  color: var(--muted);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 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: var(--header-h);
  gap: 1rem;
}

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

.logo span {
  color: var(--accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 500;
}

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

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--bg);
  border-radius: 8px;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
  font: inherit;
  color: var(--ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

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

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

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

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

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

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

.hero {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  display: grid;
  align-items: end;
  overflow: hidden;
  background: var(--bg-soft);
}

.hero__media {
  position: absolute;
  inset: 0;
}

.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.15) 0%,
    rgba(255, 255, 255, 0.55) 42%,
    rgba(255, 255, 255, 0.94) 78%,
    #fff 100%
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  padding: 4.5rem 0 3.5rem;
  max-width: 42rem;
}

.brand-mark {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 4.6rem);
  color: var(--ink);
  margin: 0 0 0.35em;
  letter-spacing: -0.04em;
}

.hero__content h1 {
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  font-weight: 500;
  color: var(--accent-deep);
  margin-bottom: 0.75em;
}

.hero__content p {
  font-size: 1.05rem;
  max-width: 36rem;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.section {
  padding: 5rem 0;
}

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

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

.section__head h2 {
  font-size: clamp(1.7rem, 3vw, 2.25rem);
}

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

.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.split--reverse {
  grid-template-columns: 0.9fr 1.1fr;
}

.split img {
  width: 100%;
  height: min(420px, 55vw);
  object-fit: cover;
  border-radius: var(--radius);
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
}

.metric-row strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.75rem;
  color: var(--ink);
}

.metric-row span {
  color: var(--muted);
  font-size: 0.9rem;
}

.benefit-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1.25rem;
}

.benefit-list li {
  padding-left: 1.25rem;
  border-left: 3px solid var(--accent);
}

.benefit-list h3 {
  font-size: 1.15rem;
  margin-bottom: 0.3rem;
}

.course-grid,
.blog-grid,
.tier-grid,
.review-grid {
  display: grid;
  gap: 1.75rem;
}

.course-grid {
  grid-template-columns: repeat(3, 1fr);
}

.blog-grid {
  grid-template-columns: repeat(3, 1fr);
}

.tier-grid {
  grid-template-columns: repeat(3, 1fr);
  align-items: stretch;
}

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

.course-item,
.blog-item {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.course-item a,
.blog-item a {
  text-decoration: none;
  color: inherit;
}

.course-item img,
.blog-item img,
.page-hero img,
.article-cover img,
.instructor-photo {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius);
}

.course-item h3,
.blog-item h3 {
  font-size: 1.2rem;
  margin: 0;
  color: var(--ink);
}

.course-item p,
.blog-item p {
  margin: 0;
  font-size: 0.95rem;
}

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

.quote-block {
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
}

.quote-block blockquote {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--ink);
  line-height: 1.5;
}

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

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

.tier--featured {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  background: linear-gradient(180deg, var(--accent-soft), #fff 40%);
}

.tier h3 {
  font-size: 1.35rem;
}

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

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

.tier li + li {
  margin-top: 0.45rem;
}

.review-card {
  padding: 0;
}

.review-card .stars {
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.page-hero {
  padding: 3.5rem 0 2rem;
}

.page-hero h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  max-width: 18ch;
}

.page-hero p.lead {
  font-size: 1.1rem;
  max-width: 40rem;
}

.prose {
  max-width: 42rem;
}

.prose h2 {
  margin-top: 2.25rem;
  font-size: 1.45rem;
}

.prose h3 {
  margin-top: 1.75rem;
  font-size: 1.15rem;
}

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

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 1.25rem 0;
}

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

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

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

.faq summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ink);
}

.faq p {
  margin-top: 0.75rem;
}

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

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

.module__num {
  font-family: var(--font-display);
  color: var(--accent);
  font-size: 1.25rem;
}

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

.field {
  margin-bottom: 1.15rem;
}

.field label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--ink);
  font-size: 0.95rem;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  background: #fff;
  color: var(--ink);
}

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

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

.field-error {
  min-height: 1.2em;
  color: var(--warn);
  font-size: 0.85rem;
  margin-top: 0.3rem;
}

.form-status {
  margin-top: 1rem;
  font-weight: 500;
}

.form-status--ok {
  color: var(--ok);
}

.form-status--err {
  color: var(--warn);
}

.address-block {
  background: var(--bg-soft);
  padding: 1.5rem;
  border-radius: var(--radius);
}

.address-block p {
  margin-bottom: 0.5rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 3rem 0 2rem;
  background: var(--bg-soft);
  margin-top: 2rem;
}

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

.footer-grid h3 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

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

.footer-grid li + li {
  margin-top: 0.4rem;
}

.footer-grid a {
  text-decoration: none;
  color: var(--muted);
}

.footer-grid a:hover {
  color: var(--accent-deep);
}

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.cookie-banner {
  position: fixed;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 60;
  max-width: 720px;
  margin-inline: auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.35rem;
}

.cookie-banner__inner {
  display: grid;
  gap: 1rem;
}

.cookie-banner p {
  margin: 0;
  font-size: 0.92rem;
}

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

.inline-error {
  background: #fdecea;
  color: var(--warn);
  padding: 0.75rem 1rem;
  margin: 0;
  text-align: center;
  font-size: 0.9rem;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.case-study {
  display: grid;
  gap: 1.5rem;
  padding: 2rem 0;
  border-top: 1px solid var(--line);
}

.case-study h3 {
  font-size: 1.4rem;
}

.not-found {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 3rem 1rem;
}

.not-found h1 {
  font-size: clamp(3rem, 8vw, 5rem);
  margin-bottom: 0.2em;
}

.instructor {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 1.25rem;
  align-items: start;
}

.instructor-photo {
  aspect-ratio: 1;
  border-radius: 50%;
}

.cta-band {
  background: linear-gradient(135deg, var(--accent-soft), #fff 55%, var(--bg-soft));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 3.5rem 0;
}

.cta-band .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.cta-band h2 {
  margin: 0;
  max-width: 18ch;
}

@media (max-width: 900px) {
  .split,
  .split--reverse,
  .course-grid,
  .blog-grid,
  .tier-grid,
  .review-grid,
  .contact-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .metric-row {
    grid-template-columns: 1fr;
  }

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

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: #fff;
    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;
  }

  .header-inner {
    position: relative;
  }

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

  .instructor-photo {
    width: 120px;
  }
}