:root {
  --bg: #ffffff;
  --bg-soft: #f3f7f5;
  --bg-muted: #e8efec;
  --ink: #1a2421;
  --ink-soft: #4d5c57;
  --line: #d5e0db;
  --accent: #3d8b7a;
  --accent-deep: #2f6f61;
  --accent-soft: #e6f3ef;
  --warn: #9a4a3a;
  --radius: 2px;
  --font-display: "Nanum Myeongjo", "Noto Serif KR", serif;
  --font-body: "IBM Plex Sans KR", "Noto Sans KR", sans-serif;
  --shadow-soft: 0 18px 40px rgba(26, 36, 33, 0.06);
  --header-h: 4.25rem;
  --max: 1120px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::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-weight: 400;
  font-size: 1.02rem;
  -webkit-font-smoothing: antialiased;
}

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: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--ink);
}

p {
  margin: 0 0 1rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--ink);
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 1000;
  transition: top 0.2s var(--ease);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 8px 24px rgba(26, 36, 33, 0.04);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

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

.brand-mark {
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 0.35rem;
  background: linear-gradient(145deg, var(--accent) 0%, var(--accent-deep) 100%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.2);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
}

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

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -0.3rem;
  height: 1px;
  background: var(--accent);
  transition: right 0.35s var(--ease);
}

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

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
  right: 0;
}

.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: 0.55rem 1rem;
  border-radius: var(--radius);
  transition: background 0.25s var(--ease), transform 0.25s var(--ease);
}

.nav-cta::after {
  display: none !important;
}

.nav-cta:hover {
  background: var(--accent-deep);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  padding: 0.4rem;
  cursor: pointer;
}

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 1.4rem;
  height: 2px;
  background: var(--ink);
  position: relative;
  transition: transform 0.25s var(--ease);
}

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

.nav-toggle-bars::before {
  top: -6px;
}

.nav-toggle-bars::after {
  top: 6px;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.section {
  padding: 4.5rem 0;
}

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

.eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-deep);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.lead {
  font-size: 1.12rem;
  color: var(--ink-soft);
  max-width: 38rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.85rem 1.35rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.98rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

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

.btn-primary:hover {
  background: var(--accent-deep);
  color: #fff;
  transform: translateY(-1px);
}

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

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

.hero-home {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  display: grid;
  align-items: end;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(26, 36, 33, 0.15) 0%, rgba(26, 36, 33, 0.72) 100%),
    url("https://images.unsplash.com/photo-1551288049-bebda4e38f71?auto=format&fit=crop&w=2000&q=80") center/cover no-repeat;
  color: #fff;
}

.hero-home-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 5rem 1.25rem 4rem;
  width: 100%;
}

.hero-home .brand-hero {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 5.6rem);
  line-height: 1.05;
  margin: 0 0 1.25rem;
  letter-spacing: -0.04em;
  animation: rise 0.9s var(--ease) both;
}

.hero-home h1 {
  color: #fff;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  font-weight: 400;
  max-width: 28rem;
  margin: 0 0 1.75rem;
  animation: rise 0.9s var(--ease) 0.12s both;
}

.hero-home .btn-primary {
  animation: rise 0.9s var(--ease) 0.22s both;
}

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

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

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

.metric-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}

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

.metric strong {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  letter-spacing: -0.03em;
}

.metric span {
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.feature-list {
  display: grid;
  gap: 1.75rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1rem;
  align-items: start;
}

.feature-index {
  font-family: var(--font-display);
  color: var(--accent);
  font-size: 1.4rem;
}

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

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

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

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

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

.media-tile {
  position: relative;
  overflow: hidden;
  background: var(--bg-muted);
}

.media-tile img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  transition: transform 0.7s var(--ease);
}

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

.tile-body {
  padding: 1.25rem 0 0;
}

.tile-body h3 {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
}

.tile-body h3 a {
  color: inherit;
  text-decoration: none;
}

.tile-body h3 a:hover {
  color: var(--accent-deep);
}

.meta {
  color: var(--ink-soft);
  font-size: 0.88rem;
  margin-bottom: 0.5rem;
}

.price-tier {
  border: 1px solid var(--line);
  padding: 1.75rem;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  min-height: 100%;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

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

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

.price-tier h3 {
  margin: 0 0 0.4rem;
  font-size: 1.45rem;
}

.price-amount {
  font-family: var(--font-display);
  font-size: 2.2rem;
  margin: 0.75rem 0 1rem;
}

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

.quote {
  border-left: 2px solid var(--accent);
  padding: 0.25rem 0 0.25rem 1.25rem;
  margin: 0;
}

.quote p {
  font-size: 1.05rem;
}

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

.case-study {
  background: var(--bg);
  border-top: 1px solid var(--line);
  padding: 2rem 0;
}

.form {
  display: grid;
  gap: 1.1rem;
  max-width: 36rem;
}

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

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

.form input,
.form select,
.form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.8rem 0.9rem;
  font: inherit;
  background: #fff;
  color: var(--ink);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.form input:focus,
.form select:focus,
.form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(61, 139, 122, 0.15);
}

.field-error {
  color: var(--warn);
  font-size: 0.86rem;
  min-height: 1.2em;
}

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

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

.form-status.is-error {
  display: block;
  background: #f8ece9;
  color: var(--warn);
}

.legal {
  max-width: 46rem;
}

.legal h1 {
  margin-bottom: 0.5rem;
}

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

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

.cookie-table th,
.cookie-table td {
  border: 1px solid var(--line);
  padding: 0.7rem 0.8rem;
  text-align: left;
  vertical-align: top;
}

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

.page-hero {
  padding: 3.5rem 0 2rem;
  background:
    linear-gradient(180deg, var(--bg-soft), var(--bg));
}

.page-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin: 0 0 0.75rem;
}

.breadcrumb {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin-bottom: 1rem;
}

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

.modules {
  display: grid;
  gap: 1rem;
  margin: 1.5rem 0;
}

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

.module h3 {
  margin: 0 0 0.35rem;
  font-size: 1.15rem;
}

.instructor {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 1.25rem;
  align-items: center;
  margin: 1.5rem 0;
}

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

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

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

.site-footer {
  background: #16201d;
  color: #d7e2dd;
  margin-top: 4rem;
  padding: 3.5rem 0 2rem;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: #fff;
  margin: 0 0 0.5rem;
}

.footer-tag {
  color: #a9b8b2;
  max-width: 22rem;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.footer-col h2 {
  font-family: var(--font-body);
  font-size: 0.84rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #fff;
  margin: 0 0 0.9rem;
}

.footer-col a {
  display: block;
  color: #a9b8b2;
  text-decoration: none;
  margin-bottom: 0.45rem;
}

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

.footer-contact p {
  color: #a9b8b2;
  font-size: 0.9rem;
  margin-bottom: 0.55rem;
}

.footer-contact a {
  display: inline;
  color: #cfe0d9;
}

.footer-bottom {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #8fa39b;
  font-size: 0.88rem;
}

.cookie-banner {
  position: fixed;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 200;
  max-width: 34rem;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
  padding: 1.25rem;
  display: none;
}

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

.cookie-banner p {
  margin: 0 0 1rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

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

.inline-error {
  margin: 0.75rem 0;
  padding: 0.75rem 1rem;
  background: #f8ece9;
  color: var(--warn);
  border-radius: var(--radius);
}

.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);
  line-height: 1;
  margin: 0;
}

.cta-band {
  background: linear-gradient(120deg, var(--accent-deep), var(--accent));
  color: #fff;
  padding: 3.5rem 0;
}

.cta-band h2 {
  color: #fff;
  margin: 0 0 0.75rem;
}

.cta-band p {
  color: rgba(255, 255, 255, 0.88);
  max-width: 32rem;
}

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

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

.prose {
  max-width: 42rem;
}

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

.article-cover {
  margin: 1.5rem 0 2rem;
  overflow: hidden;
}

.article-cover img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

@media (max-width: 960px) {
  .split,
  .course-grid,
  .price-grid,
  .review-grid,
  .footer-cols,
  .blog-grid {
    grid-template-columns: 1fr;
  }

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

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

  .site-nav {
    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: 0.25rem;
    display: none;
  }

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

  .site-nav a {
    padding: 0.7rem 0;
  }

  .nav-cta {
    text-align: center;
    margin-top: 0.5rem;
  }
}

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