:root {
  --bg: #ffffff;
  --bg-soft: #f4f7f6;
  --bg-mist: #e8f0ee;
  --ink: #1a2f2a;
  --ink-muted: #4a5c57;
  --ink-faint: #7a8a85;
  --accent: #3d8b7a;
  --accent-deep: #2a6b5d;
  --accent-soft: #d4ebe5;
  --line: #d7e2de;
  --danger: #b33a3a;
  --ok: #2a6b5d;
  --radius: 4px;
  --shadow-soft: 0 18px 40px rgba(26, 47, 42, 0.06);
  --font-display: "Fraunces", "Noto Serif KR", Georgia, serif;
  --font-body: "IBM Plex Sans KR", "Noto Sans KR", sans-serif;
  --space: clamp(1rem, 2vw, 1.5rem);
  --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-size: 1.05rem;
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 100% -10%, rgba(61, 139, 122, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 0% 100%, rgba(42, 107, 93, 0.05), transparent);
  min-height: 100vh;
}

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

a {
  color: var(--accent-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 550;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--ink);
}

h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); margin: 0 0 0.6em; }
h2 { font-size: clamp(1.55rem, 3vw, 2.15rem); margin: 0 0 0.55em; }
h3 { font-size: 1.25rem; margin: 0 0 0.45em; }

p { margin: 0 0 1em; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--ink);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 1000;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 1rem;
}

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

/* Header */
.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);
}

.header-inner {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink);
}

.logo-mark {
  width: 1.65rem;
  height: 1.65rem;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 40%, #7bc4b4 0 28%, transparent 29%),
    radial-gradient(circle at 65% 55%, #3d8b7a 0 38%, transparent 39%),
    #1a2f2a;
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0.15rem 1.15rem;
}

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

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

.nav-cta {
  background: var(--ink);
  color: #fff !important;
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
}

.nav-cta:hover {
  background: var(--accent-deep);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  width: 2.6rem;
  height: 2.6rem;
  border-radius: var(--radius);
  cursor: pointer;
  position: relative;
}

.nav-toggle-bar,
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  display: block;
  width: 1.1rem;
  height: 2px;
  background: var(--ink);
  margin: auto;
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
}

.nav-toggle-bar::before { transform: translateY(-5px); }
.nav-toggle-bar::after { transform: translateY(5px); }

@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: var(--header-h);
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 1rem 1.25rem 1.25rem;
    display: none;
  }
  .site-nav.is-open { display: block; }
  .site-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.8rem 1.35rem;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 0.98rem;
  font-weight: 550;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.25s ease, background 0.25s ease, color 0.25s 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);
}

/* Hero — full bleed */
.hero-bleed {
  position: relative;
  min-height: min(92vh, 760px);
  display: grid;
  align-items: end;
  overflow: hidden;
  color: #f5faf8;
}

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

.hero-bleed__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  animation: heroDrift 28s ease-in-out infinite alternate;
}

.hero-bleed__shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(26, 47, 42, 0.35) 0%, rgba(26, 47, 42, 0.72) 55%, rgba(26, 47, 42, 0.9) 100%),
    linear-gradient(90deg, rgba(26, 47, 42, 0.55) 0%, transparent 60%);
  z-index: 1;
}

.hero-bleed__content {
  position: relative;
  z-index: 2;
  width: min(100% - 2.5rem, var(--max));
  margin: 0 auto;
  padding: 5rem 0 4rem;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  margin: 0 0 0.35em;
  animation: riseIn 0.9s ease both;
}

.hero-bleed h1 {
  color: #fff;
  font-size: clamp(1.35rem, 2.8vw, 1.85rem);
  font-weight: 500;
  max-width: 22ch;
  margin-bottom: 0.5em;
  animation: riseIn 0.9s ease 0.12s both;
}

.hero-bleed .lede {
  color: rgba(245, 250, 248, 0.88);
  max-width: 36ch;
  font-size: 1.05rem;
  animation: riseIn 0.9s ease 0.22s both;
}

.hero-actions {
  margin-top: 1.75rem;
  animation: riseIn 0.9s ease 0.32s both;
}

.page-hero {
  padding: 3.5rem 0 2.5rem;
  background: linear-gradient(180deg, var(--bg-soft), var(--bg));
  border-bottom: 1px solid var(--line);
}

.page-hero .eyebrow {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.page-hero .lede {
  color: var(--ink-muted);
  max-width: 42rem;
  font-size: 1.1rem;
}

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

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

.section-head {
  max-width: 40rem;
  margin-bottom: 2.5rem;
}

.section-head p {
  color: var(--ink-muted);
}

.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

@media (max-width: 800px) {
  .split { grid-template-columns: 1fr; }
}

.media-frame {
  overflow: hidden;
  border-radius: 2px;
  box-shadow: var(--shadow-soft);
}

.media-frame img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 0.7s ease;
}

.media-frame:hover img {
  transform: scale(1.03);
}

/* Proof strip */
.proof-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding: 2.25rem 0;
  border-block: 1px solid var(--line);
}

.proof-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  color: var(--accent-deep);
  letter-spacing: -0.03em;
}

.proof-item span {
  color: var(--ink-muted);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  .proof-strip { grid-template-columns: 1fr; gap: 1.25rem; }
}

/* Feature list — not cards */
.feature-rail {
  display: grid;
  gap: 0;
}

.feature-rail article {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: 1.25rem;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--line);
}

.feature-rail article:first-child {
  border-top: 1px solid var(--line);
}

.feature-num {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--accent);
}

.feature-rail p {
  color: var(--ink-muted);
  margin: 0;
}

/* Course / blog listings */
.item-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem 1.5rem;
}

@media (max-width: 900px) {
  .item-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  .item-grid { grid-template-columns: 1fr; }
}

.item-tile {
  text-decoration: none;
  color: inherit;
  display: block;
  transition: opacity 0.25s ease;
}

.item-tile:hover { opacity: 0.88; }

.item-tile img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  margin-bottom: 1rem;
}

.item-tile h3 {
  font-size: 1.15rem;
  margin-bottom: 0.35em;
}

.item-tile p {
  color: var(--ink-muted);
  font-size: 0.95rem;
  margin: 0;
}

.meta {
  color: var(--ink-faint);
  font-size: 0.85rem;
  margin-bottom: 0.4rem;
}

/* Quotes */
.quote-stack {
  display: grid;
  gap: 2rem;
}

.quote {
  padding: 0;
  margin: 0;
  border-left: 3px solid var(--accent);
  padding-left: 1.5rem;
}

.quote p {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  line-height: 1.45;
  margin-bottom: 0.75rem;
}

.quote footer {
  color: var(--ink-muted);
  font-size: 0.92rem;
  font-family: var(--font-body);
}

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

@media (max-width: 860px) {
  .price-grid { grid-template-columns: 1fr; }
}

.price-tier {
  padding: 2rem 1.75rem;
  border: 1px solid var(--line);
  background: #fff;
  display: flex;
  flex-direction: column;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

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

.price-tier.is-featured {
  border-color: var(--accent);
  background: var(--bg-soft);
}

.price-tier .amount {
  font-family: var(--font-display);
  font-size: 2rem;
  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: 0.9rem;
  color: var(--ink-faint);
  margin-top: 1.5rem;
}

/* Forms */
.form-panel {
  max-width: 36rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-weight: 550;
  margin-bottom: 0.4rem;
  font-size: 0.95rem;
}

.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: inherit;
  background: #fff;
  color: var(--ink);
}

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

.form-group textarea { min-height: 9rem; resize: vertical; }

.field-error {
  color: var(--danger);
  font-size: 0.88rem;
  margin-top: 0.35rem;
  display: none;
}

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

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

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

.form-status.is-error {
  display: block;
  background: #f8e8e8;
  color: var(--danger);
}

.inline-error {
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  background: #f8e8e8;
  color: var(--danger);
  border-radius: var(--radius);
  display: none;
}

.inline-error.is-visible { display: block; }

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

.faq summary {
  cursor: pointer;
  font-weight: 550;
  list-style: none;
}

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

.faq details p {
  color: var(--ink-muted);
  margin: 0.75rem 0 0.25rem;
}

/* Legal */
.legal-body {
  max-width: 46rem;
}

.legal-body h2 {
  margin-top: 2.25rem;
  font-size: 1.35rem;
}

.legal-body ul { color: var(--ink-muted); }

.cookie-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 1.5rem 0;
}

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

.cookie-table th {
  background: var(--bg-soft);
  font-weight: 550;
}

/* Modules */
.module-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.module-list li {
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1rem;
}

.module-list strong {
  color: var(--accent);
  font-family: var(--font-display);
}

/* CTA band */
.cta-band {
  background: var(--ink);
  color: #e8f4f1;
  padding: clamp(3rem, 6vw, 4.5rem) 0;
  text-align: center;
}

.cta-band h2 { color: #fff; }
.cta-band p {
  color: rgba(232, 244, 241, 0.8);
  max-width: 34rem;
  margin: 0 auto 1.5rem;
}

/* Footer */
.site-footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  padding: 3.5rem 0 2rem;
  margin-top: auto;
}

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

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  margin: 0 0 0.4rem;
}

.footer-tag {
  color: var(--ink-muted);
  max-width: 28rem;
  font-size: 0.95rem;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin: 2.5rem 0 2rem;
}

.footer-cols h2 {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-family: var(--font-body);
  font-weight: 600;
  margin-bottom: 0.85rem;
}

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

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

.footer-cols a {
  text-decoration: none;
  color: var(--ink-muted);
  font-size: 0.95rem;
}

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

.footer-cols address {
  font-style: normal;
  color: var(--ink-muted);
  font-size: 0.88rem;
  line-height: 1.55;
  margin-bottom: 0.75rem;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--ink-faint);
  border-top: 1px solid var(--line);
  padding-top: 1.25rem;
  margin: 0;
}

@media (max-width: 800px) {
  .footer-cols { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .footer-cols { grid-template-columns: 1fr; }
}

/* Cookie banner */
.cookie-banner {
  position: fixed;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 200;
  max-width: 420px;
  margin-left: auto;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
  padding: 1.25rem 1.35rem;
  display: none;
}

.cookie-banner.is-visible { display: block; animation: riseIn 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: 0.5rem;
}

.cookie-actions .btn {
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
}

/* 404 */
.not-found {
  min-height: 60vh;
  display: grid;
  place-content: center;
  text-align: center;
  padding: 3rem 1.25rem;
}

.not-found .code {
  font-family: var(--font-display);
  font-size: clamp(4rem, 12vw, 7rem);
  color: var(--accent-soft);
  line-height: 1;
  margin: 0;
}

/* Instructor */
.instructor {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 1.25rem;
  align-items: start;
}

.instructor img {
  width: 7rem;
  height: 7rem;
  object-fit: cover;
  border-radius: 50%;
}

/* Case study */
.case-block {
  padding: 2rem 0;
  border-top: 1px solid var(--line);
}

.case-block h3 { margin-top: 0; }

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

/* Animations */
@keyframes riseIn {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes heroDrift {
  from { transform: scale(1.02) translate(0, 0); }
  to { transform: scale(1.08) translate(-1.5%, 1%); }
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* Contact layout */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
}

@media (max-width: 800px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-aside {
  background: var(--bg-soft);
  padding: 1.75rem;
  border: 1px solid var(--line);
}

.contact-aside h2 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

.contact-aside address {
  font-style: normal;
  color: var(--ink-muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

.prose-wide {
  max-width: 42rem;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}

.tag {
  font-size: 0.8rem;
  color: var(--accent-deep);
  background: var(--accent-soft);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
}

.article-body {
  max-width: 42rem;
  margin: 0 auto;
}

.article-body .cover {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  margin: 0 0 2rem;
}

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

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

.outcomes li {
  padding: 0.65rem 0 0.65rem 1.5rem;
  position: relative;
  border-bottom: 1px solid var(--line);
  color: var(--ink-muted);
}

.outcomes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--accent);
}