:root {
  --bg: #f7f7f5;
  --bg-elevated: #ffffff;
  --ink: #1e2428;
  --ink-soft: #5a636a;
  --line: #e2e0db;
  --accent: #3d5c4a;
  --accent-hover: #2f4739;
  --accent-soft: #e6efe9;
  --warm: #c4b8a8;
  --danger: #8b3a3a;
  --success: #2f5d3a;
  --radius: 2px;
  --shadow: 0 12px 40px rgba(30, 36, 40, 0.06);
  --font-display: "Noto Serif KR", "Song Myung", serif;
  --font-body: "Noto Sans KR", sans-serif;
  --space: clamp(1rem, 3vw, 2rem);
  --max: 1120px;
  --header-h: 4.25rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--ink);
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(61, 92, 74, 0.07), transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(196, 184, 168, 0.18), transparent 50%),
    var(--bg);
  line-height: 1.7;
  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: var(--accent-hover);
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
}

h3 {
  font-size: 1.25rem;
}

p {
  margin: 0 0 1rem;
  color: var(--ink-soft);
}

.container {
  width: min(100% - 2 * var(--space), var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(247, 247, 245, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 1rem;
}

.brand {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.brand span {
  display: block;
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 400;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
  margin-top: 0.1rem;
}

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

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

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

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.7rem 1.25rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font: inherit;
  font-size: 0.92rem;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

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

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

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

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

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

.btn--light {
  background: var(--bg-elevated);
  color: var(--ink);
  border-color: var(--line);
}

.site-footer {
  margin-top: 5rem;
  border-top: 1px solid var(--line);
  background: var(--bg-elevated);
  padding: 3rem 0 2rem;
}

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

.footer-grid h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  font-family: var(--font-body);
  font-weight: 500;
}

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

.footer-grid li {
  margin-bottom: 0.45rem;
}

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

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

.footer-meta {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.address-block {
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.65;
}

.hero {
  position: relative;
  min-height: min(88vh, 720px);
  display: grid;
  align-items: end;
  overflow: hidden;
  color: #fff;
}

.hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

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

.hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(20, 28, 32, 0.25) 0%, rgba(20, 28, 32, 0.78) 70%);
}

.hero__content {
  position: relative;
  z-index: 1;
  padding: 4rem 0 3.5rem;
  animation: rise 0.9s ease both;
}

.hero__brand {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 4.5rem);
  font-weight: 600;
  line-height: 1.05;
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
}

.hero__lead {
  max-width: 34rem;
  color: rgba(255, 255, 255, 0.88);
  font-size: 1.05rem;
  margin-bottom: 1.75rem;
}

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

.section {
  padding: 4.5rem 0;
}

.section--tight {
  padding: 3rem 0;
}

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

.section__head p {
  margin-bottom: 0;
}

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.65rem;
  font-weight: 500;
}

.proof-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: -1px;
  position: relative;
  z-index: 2;
}

.proof-strip article {
  background: var(--bg-elevated);
  padding: 1.75rem 1.5rem;
  text-align: center;
  animation: fade-up 0.7s ease both;
}

.proof-strip article:nth-child(2) {
  animation-delay: 0.1s;
}

.proof-strip article:nth-child(3) {
  animation-delay: 0.2s;
}

.proof-strip strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.85rem;
  color: var(--ink);
  margin-bottom: 0.25rem;
}

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

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

.media-card {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.media-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.media-card a {
  text-decoration: none;
  color: inherit;
}

.media-card__img {
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.media-card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.media-card:hover .media-card__img img {
  transform: scale(1.04);
}

.media-card__body {
  padding: 1.25rem 1.35rem 1.5rem;
}

.media-card__body h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.media-card__body p {
  font-size: 0.92rem;
  margin-bottom: 0.85rem;
}

.media-card__meta {
  font-size: 0.8rem;
  color: var(--warm);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.split--reverse > :first-child {
  order: 2;
}

.split img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.benefit-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
}

.benefit-list li {
  padding: 1rem 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 0.75rem;
}

.benefit-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.benefit-list strong {
  display: block;
  color: var(--ink);
  margin-bottom: 0.2rem;
}

.benefit-num {
  font-family: var(--font-display);
  color: var(--accent);
  font-size: 1.1rem;
}

.quote-stack {
  display: grid;
  gap: 1.5rem;
}

.quote {
  background: var(--bg-elevated);
  border-left: 3px solid var(--accent);
  padding: 1.5rem 1.75rem;
}

.quote p {
  color: var(--ink);
  font-size: 1.05rem;
  margin-bottom: 0.85rem;
}

.quote footer {
  font-size: 0.88rem;
  color: var(--ink-soft);
}

.cta-band {
  background: var(--ink);
  color: #fff;
  padding: 3.5rem 0;
  margin-top: 2rem;
}

.cta-band h2 {
  color: #fff;
}

.cta-band p {
  color: rgba(255, 255, 255, 0.78);
  max-width: 32rem;
}

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

.page-hero {
  padding: 3.5rem 0 2rem;
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  max-width: 18ch;
}

.page-hero p {
  max-width: 40rem;
  margin-bottom: 0;
}

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

.price-tier {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
}

.price-tier--featured {
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

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

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

.price-tier .price small {
  font-size: 0.9rem;
  color: var(--ink-soft);
  font-family: var(--font-body);
}

.price-tier ul {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
  flex: 1;
}

.price-tier li {
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.92rem;
  color: var(--ink-soft);
}

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

.form label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: var(--ink);
}

.form input,
.form select,
.form textarea {
  font: inherit;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  color: var(--ink);
}

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

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

.form .is-invalid {
  border-color: var(--danger);
}

.field-error {
  color: var(--danger);
  font-size: 0.82rem;
  margin: 0;
}

.form-status {
  margin: 0.5rem 0 0;
  font-size: 0.92rem;
}

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

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

.contact-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
}

.info-panel {
  background: var(--accent-soft);
  padding: 1.75rem;
  border: 1px solid var(--line);
}

.info-panel h2 {
  font-size: 1.15rem;
}

.prose {
  max-width: 42rem;
}

.prose h2 {
  margin-top: 2.5rem;
}

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

.prose ul,
.prose ol {
  color: var(--ink-soft);
  padding-left: 1.25rem;
}

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

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

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th,
td {
  border: 1px solid var(--line);
  padding: 0.75rem 0.85rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--accent-soft);
  color: var(--ink);
  font-weight: 500;
}

.modules {
  display: grid;
  gap: 0.75rem;
}

.module {
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  padding: 1.15rem 1.25rem;
}

.module h3 {
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

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

.instructor {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1.25rem;
  align-items: center;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  padding: 1.25rem;
}

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

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

.faq summary {
  cursor: pointer;
  font-weight: 500;
  color: var(--ink);
}

.faq details p {
  margin: 0.75rem 0 0;
}

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

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

.review .stars {
  color: var(--accent);
  letter-spacing: 0.1em;
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

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

.case-study h3 {
  margin-bottom: 0.75rem;
}

.article-meta {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin-bottom: 2rem;
}

.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 60;
  background: var(--bg-elevated);
  border-top: 1px solid var(--line);
  box-shadow: 0 -8px 30px rgba(30, 36, 40, 0.08);
  padding: 1.15rem var(--space);
  animation: slide-up 0.35s ease both;
}

.cookie-banner__inner {
  width: min(100%, var(--max));
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.cookie-banner__text {
  margin: 0;
  flex: 1 1 280px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.cookie-banner__actions {
  display: flex;
  gap: 0.5rem;
}

.script-error {
  background: #f8e8e8;
  color: var(--danger);
  padding: 0.65rem 1rem;
  margin: 0.5rem var(--space);
  font-size: 0.88rem;
}

.error-page {
  min-height: 60vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 4rem var(--space);
}

.error-page .code {
  font-family: var(--font-display);
  font-size: clamp(4rem, 12vw, 7rem);
  line-height: 1;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.avatar-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.avatar-row img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--bg-elevated);
}

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

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slide-up {
  from {
    transform: translateY(100%);
  }
  to {
    transform: translateY(0);
  }
}

@media (max-width: 900px) {
  .course-grid,
  .card-grid,
  .blog-grid,
  .pricing-grid,
  .proof-strip,
  .footer-grid,
  .split,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .split--reverse > :first-child {
    order: 0;
  }

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

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

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

  .site-header__inner {
    position: relative;
  }

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}