:root {
  --bg: #ffffff;
  --bg-soft: #f4f7f6;
  --bg-tint: #e8f1ee;
  --ink: #15201c;
  --ink-muted: #5a6b64;
  --line: #d5e0dc;
  --accent: #1f4e46;
  --accent-mid: #2f6f64;
  --accent-soft: #7cb8a8;
  --accent-wash: #eef6f3;
  --warn: #9a4a3a;
  --ok: #1f6b4f;
  --radius: 4px;
  --shadow: 0 18px 40px rgba(21, 32, 28, 0.08);
  --font-display: "Fraunces", "Noto Serif KR", Georgia, serif;
  --font-body: "IBM Plex Sans KR", "Noto Sans KR", sans-serif;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6.5rem;
  --max: 1120px;
  --header-h: 4.25rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 1.02rem;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent-mid);
  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: 560;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--ink);
}

h1 { font-size: clamp(2.2rem, 4.5vw, 3.6rem); margin: 0 0 var(--space-3); }
h2 { font-size: clamp(1.7rem, 3vw, 2.35rem); margin: 0 0 var(--space-2); }
h3 { font-size: 1.25rem; margin: 0 0 var(--space-1); }

p { margin: 0 0 var(--space-2); color: var(--ink-muted); }

ul { padding-left: 1.2rem; }

.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: -999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.75rem 1rem;
  z-index: 1000;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

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

.logo-mark {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 0.35rem;
  background:
    linear-gradient(145deg, var(--accent-soft), var(--accent));
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.25);
}

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

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line);
  background: var(--bg);
  border-radius: var(--radius);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.nav-toggle-bar,
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  display: block;
  width: 1.1rem;
  height: 2px;
  background: var(--ink);
  position: relative;
}

.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-bar::before { top: -5px; }
.nav-toggle-bar::after { top: 5px; }

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

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

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

.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: 0.55rem 0.95rem;
  border-radius: var(--radius);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.8rem 1.25rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.98rem;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s ease, background 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-mid);
  color: #fff;
}

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

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

.section {
  padding: var(--space-6) 0;
}

.section-soft {
  background:
    radial-gradient(ellipse 80% 60% at 10% 0%, var(--accent-wash), transparent 55%),
    var(--bg-soft);
}

.section-tint {
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-tint) 100%);
}

.eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-mid);
  margin-bottom: var(--space-2);
  font-weight: 500;
}

.lead {
  font-size: 1.15rem;
  max-width: 42rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-5);
  align-items: center;
}

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

.grid-2-auto {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.stack > * + * {
  margin-top: var(--space-3);
}

/* Hero — brand-forward editorial */
.hero-home {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  display: grid;
  align-items: end;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(21, 32, 28, 0.15), rgba(21, 32, 28, 0.62)),
    url("https://images.unsplash.com/photo-1551288049-bebda4e38f71?auto=format&fit=crop&w=1800&q=80") center/cover no-repeat;
  color: #fff;
}

.hero-home .container {
  padding: var(--space-6) 0 var(--space-5);
  position: relative;
  z-index: 1;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(3rem, 9vw, 6.5rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin: 0 0 var(--space-3);
  color: #fff;
  animation: rise 0.9s ease both;
}

.hero-home .hero-copy {
  max-width: 34rem;
  color: rgba(255, 255, 255, 0.88);
  font-size: 1.12rem;
  animation: rise 0.9s ease 0.12s both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: var(--space-3);
  animation: rise 0.9s ease 0.22s both;
}

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

.hero-home .btn-ghost {
  border-color: rgba(255, 255, 255, 0.45);
  color: #fff;
}

.hero-page {
  padding: var(--space-5) 0 var(--space-4);
  background:
    linear-gradient(120deg, var(--accent-wash), #fff 48%, var(--bg-soft));
  border-bottom: 1px solid var(--line);
}

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

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-3);
}

.feature-list li {
  padding-left: 0;
  border-top: 1px solid var(--line);
  padding-top: var(--space-3);
}

.feature-list strong {
  display: block;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 0.35rem;
}

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

.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);
}

.course-tile {
  display: grid;
  gap: var(--space-2);
}

.course-tile img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius);
}

.course-tile h3 a {
  text-decoration: none;
  color: var(--ink);
}

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

.quote-block {
  border-left: 3px solid var(--accent-soft);
  padding-left: var(--space-3);
}

.quote-block p {
  font-size: 1.15rem;
  color: var(--ink);
  font-family: var(--font-display);
}

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

.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.stat-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--accent);
}

.price-tier {
  padding: var(--space-4);
  border: 1px solid var(--line);
  background: #fff;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.price-tier:hover {
  border-color: var(--accent-soft);
  transform: translateY(-3px);
}

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

.price-amount {
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--ink);
}

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

.review-item {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--line);
}

.review-item:last-child {
  border-bottom: 0;
}

.stars {
  color: var(--accent-mid);
  letter-spacing: 0.08em;
  font-size: 0.9rem;
}

.blog-card {
  display: grid;
  gap: var(--space-2);
}

.blog-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
}

.blog-card h3 a {
  text-decoration: none;
  color: var(--ink);
}

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

.article-body h2 {
  margin-top: var(--space-4);
}

.article-hero img {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--radius);
  margin: var(--space-3) 0 var(--space-4);
}

.form {
  display: grid;
  gap: var(--space-3);
  max-width: 36rem;
}

.form-row {
  display: grid;
  gap: 0.4rem;
}

.form label {
  font-size: 0.92rem;
  color: var(--ink);
}

.form input,
.form select,
.form textarea {
  width: 100%;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font: inherit;
  background: #fff;
  color: var(--ink);
}

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

.field-error {
  color: var(--warn);
  font-size: 0.88rem;
  min-height: 1.2em;
}

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

.form-status.success {
  display: block;
  background: #e7f5ee;
  color: var(--ok);
}

.form-status.error {
  display: block;
  background: #f8ebe8;
  color: var(--warn);
}

.inline-error {
  margin: var(--space-2) 0;
  padding: 0.75rem 1rem;
  background: #f8ebe8;
  color: var(--warn);
  border-radius: var(--radius);
}

.legal {
  max-width: 46rem;
}

.legal h2 {
  margin-top: var(--space-4);
}

.legal table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: var(--space-3) 0;
}

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

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

.faq details {
  border-bottom: 1px solid var(--line);
  padding: var(--space-2) 0;
}

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

.faq details p {
  margin-top: var(--space-1);
}

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

.module-list li {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--line);
}

.module-num {
  font-family: var(--font-display);
  color: var(--accent-soft);
  font-size: 1.3rem;
}

.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.78);
  padding: var(--space-5) 0 var(--space-3);
  margin-top: var(--space-5);
}

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

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

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr) 1.4fr;
  gap: var(--space-3);
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: #fff;
  margin: 0 0 0.5rem;
}

.footer-tag,
.footer-contact p {
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.7);
}

.footer-heading {
  color: #fff;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0 0 0.75rem;
}

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

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

.footer-bottom {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.88rem;
}

.cookie-banner {
  position: fixed;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 80;
  max-width: 40rem;
  margin-inline: auto;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: var(--space-3);
  border-radius: var(--radius);
  display: none;
}

.cookie-banner.is-visible {
  display: block;
  animation: rise 0.45s ease both;
}

.cookie-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: var(--space-2);
}

.page-404 {
  min-height: 60vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: var(--space-5) 0;
}

.page-404 .code {
  font-family: var(--font-display);
  font-size: clamp(4rem, 12vw, 8rem);
  color: var(--accent-soft);
  line-height: 1;
  margin: 0;
}

.instructor {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: var(--space-3);
  align-items: center;
}

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

.case-study {
  padding: var(--space-4);
  background: var(--bg-soft);
  border-left: 3px solid var(--accent);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 900px) {
  .grid-2,
  .grid-2-auto,
  .grid-3,
  .footer-grid,
  .stat-row {
    grid-template-columns: 1fr;
  }

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

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: #fff;
    border-bottom: 1px solid var(--line);
    display: none;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-2);
    gap: 0;
  }

  .nav-list a {
    display: block;
    padding: 0.75rem;
  }

  .nav-cta {
    text-align: center;
  }

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