:root {
  --bg: #f7f8f6;
  --bg-elevated: #ffffff;
  --ink: #1c2422;
  --ink-soft: #4a5754;
  --line: #d8e3dc;
  --accent: #1b6b63;
  --accent-deep: #0f4a45;
  --accent-soft: #e4f1ef;
  --warm: #c9863a;
  --warm-soft: #f7efe4;
  --danger: #a33b2d;
  --success: #1f6b45;
  --shadow: 0 18px 40px rgba(28, 36, 34, 0.08);
  --radius: 14px;
  --font-display: "Nanum Myeongjo", "Noto Serif KR", serif;
  --font-body: "Noto Sans KR", 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:
    radial-gradient(1200px 600px at 90% -10%, rgba(27, 107, 99, 0.08), transparent 55%),
    radial-gradient(900px 500px at -5% 20%, rgba(201, 134, 58, 0.07), transparent 50%),
    linear-gradient(180deg, #fbfcfb 0%, var(--bg) 40%, #f3f5f2 100%);
  line-height: 1.7;
  min-height: 100vh;
}

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

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);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.02em;
  color: var(--ink);
}

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

.shell {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.inline-error {
  background: #fdeceb;
  color: var(--danger);
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid #f0c4be;
  font-size: 0.95rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(12px);
  background: rgba(247, 248, 246, 0.86);
  border-bottom: 1px solid rgba(28, 36, 34, 0.08);
}

.header-bar {
  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: 0.45rem;
  background:
    linear-gradient(145deg, var(--accent) 0%, #2f948a 55%, var(--warm) 100%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.25);
}

.brand__text {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.94rem;
  position: relative;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.3rem;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.25s ease;
}

.site-nav a:hover {
  color: var(--ink);
}

.site-nav a:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  background: var(--accent);
  color: #fff !important;
}

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

.nav-cta:hover {
  background: var(--accent-deep);
  color: #fff !important;
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid rgba(28, 36, 34, 0.12);
  background: var(--bg-elevated);
  border-radius: 0.6rem;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 1.1rem;
  height: 2px;
  margin: 0.28rem auto;
  background: var(--ink);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.8rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.95rem;
  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-deep);
  color: #fff;
}

.btn--ghost {
  background: transparent;
  border-color: rgba(28, 36, 34, 0.18);
  color: var(--ink);
}

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

.btn--warm {
  background: var(--warm-soft);
  color: #7a4d16;
  border-color: rgba(201, 134, 58, 0.35);
}

/* Hero */
.hero {
  position: relative;
  min-height: min(92vh, 820px);
  display: grid;
  align-items: end;
  overflow: hidden;
  color: #f7faf9;
}

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

.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.03);
  animation: slow-zoom 18s ease-in-out infinite alternate;
}

.hero__veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(100deg, rgba(12, 28, 26, 0.82) 8%, rgba(12, 28, 26, 0.45) 48%, rgba(12, 28, 26, 0.28) 100%),
    linear-gradient(0deg, rgba(12, 28, 26, 0.55), transparent 45%);
}

.hero__content {
  position: relative;
  z-index: 1;
  padding: 7rem 0 4.5rem;
}

.hero__brand {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  line-height: 1.1;
  margin: 0 0 1.2rem;
  color: #fff;
  max-width: 14ch;
  animation: rise 0.9s ease both;
}

.hero__lead {
  max-width: 34rem;
  font-size: 1.08rem;
  color: rgba(247, 250, 249, 0.9);
  margin-bottom: 1.8rem;
  animation: rise 0.9s ease 0.12s both;
}

.hero__actions {
  animation: rise 0.9s ease 0.22s both;
}

.page-hero {
  padding: 4.5rem 0 2.5rem;
}

.page-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin: 0 0 0.8rem;
}

.page-hero p {
  max-width: 40rem;
  font-size: 1.05rem;
}

/* Sections */
.section {
  padding: 4.5rem 0;
}

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

.section__head {
  max-width: 40rem;
  margin-bottom: 2.2rem;
}

.section__head h2 {
  font-size: clamp(1.7rem, 3vw, 2.35rem);
  margin: 0 0 0.7rem;
}

.kicker {
  display: inline-block;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.55rem;
}

.proof-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding: 1.4rem;
  background: var(--bg-elevated);
  border: 1px solid rgba(28, 36, 34, 0.08);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.proof-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.7rem;
  color: var(--accent-deep);
}

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

.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
}

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

.media-frame {
  border-radius: calc(var(--radius) + 4px);
  overflow: hidden;
  box-shadow: var(--shadow);
}

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

.feature-list {
  list-style: none;
  padding: 0;
  margin: 1.2rem 0 0;
  display: grid;
  gap: 0.9rem;
}

.feature-list li {
  padding-left: 1.4rem;
  position: relative;
  color: var(--ink-soft);
}

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

.course-grid,
.card-grid,
.blog-grid,
.tier-grid {
  display: grid;
  gap: 1.4rem;
}

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

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

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

.tier-grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

.course-card,
.blog-card,
.tier,
.review-card,
.case-card {
  background: var(--bg-elevated);
  border: 1px solid rgba(28, 36, 34, 0.08);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.course-card:hover,
.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.course-card a,
.blog-card a {
  text-decoration: none;
  color: inherit;
  display: block;
}

.course-card img,
.blog-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.course-card__body,
.blog-card__body,
.tier__body,
.review-card,
.case-card {
  padding: 1.25rem 1.3rem 1.4rem;
}

.course-card h3,
.blog-card h3,
.tier h3 {
  margin: 0 0 0.55rem;
  font-size: 1.2rem;
}

.meta {
  font-size: 0.85rem;
  color: #6a7773;
  margin-bottom: 0.5rem;
}

.tier {
  display: flex;
  flex-direction: column;
}

.tier--focus {
  border-color: rgba(27, 107, 99, 0.45);
  box-shadow: 0 16px 36px rgba(27, 107, 99, 0.12);
}

.tier__price {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--accent-deep);
  margin: 0.4rem 0 1rem;
}

.tier__price span {
  font-size: 0.95rem;
  color: var(--ink-soft);
  font-family: var(--font-body);
}

.tier ul {
  margin: 0 0 1.4rem;
  padding-left: 1.1rem;
  color: var(--ink-soft);
  flex: 1;
}

.quote {
  font-size: 1.05rem;
  color: var(--ink);
  margin-bottom: 1rem;
}

.quote-attr {
  font-size: 0.9rem;
  color: #66736f;
}

.stars {
  color: var(--warm);
  letter-spacing: 0.08em;
  margin-bottom: 0.55rem;
}

.faq details {
  background: var(--bg-elevated);
  border: 1px solid rgba(28, 36, 34, 0.08);
  border-radius: 12px;
  padding: 1rem 1.15rem;
  margin-bottom: 0.7rem;
}

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

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

.cta-band {
  margin: 2rem 0 4rem;
  padding: 2.4rem;
  border-radius: calc(var(--radius) + 6px);
  background:
    linear-gradient(135deg, rgba(27, 107, 99, 0.12), rgba(201, 134, 58, 0.1)),
    var(--bg-elevated);
  border: 1px solid rgba(28, 36, 34, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.cta-band h2 {
  margin: 0 0 0.45rem;
  font-size: 1.7rem;
}

.cta-band p {
  margin: 0;
}

/* Forms */
.form-panel {
  background: var(--bg-elevated);
  border: 1px solid rgba(28, 36, 34, 0.08);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: var(--shadow);
}

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

label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.92rem;
  color: var(--ink);
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid rgba(28, 36, 34, 0.16);
  border-radius: 10px;
  padding: 0.75rem 0.85rem;
  font: inherit;
  background: #fff;
  color: var(--ink);
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid rgba(27, 107, 99, 0.28);
  border-color: var(--accent);
}

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

.field-error {
  color: var(--danger);
  font-size: 0.85rem;
  min-height: 1.1em;
}

.form-status {
  margin-top: 0.8rem;
  font-size: 0.95rem;
}

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

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

.contact-aside {
  display: grid;
  gap: 1rem;
}

.contact-block {
  background: var(--bg-elevated);
  border: 1px solid rgba(28, 36, 34, 0.08);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
}

.contact-block h2 {
  margin: 0 0 0.55rem;
  font-size: 1.15rem;
}

.legal {
  max-width: 48rem;
}

.legal h2 {
  margin-top: 2rem;
  font-size: 1.35rem;
}

.legal table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.92rem;
}

.legal th,
.legal td {
  border: 1px solid rgba(28, 36, 34, 0.12);
  padding: 0.65rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

.legal th {
  background: var(--accent-soft);
}

.module-list {
  counter-reset: mod;
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.85rem;
}

.module-list li {
  counter-increment: mod;
  background: var(--bg-elevated);
  border: 1px solid rgba(28, 36, 34, 0.08);
  border-radius: 12px;
  padding: 1rem 1.1rem 1rem 3.2rem;
  position: relative;
}

.module-list li::before {
  content: counter(mod, decimal-leading-zero);
  position: absolute;
  left: 1rem;
  top: 1rem;
  font-family: var(--font-display);
  color: var(--accent);
  font-weight: 700;
}

.instructor {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1.2rem;
  align-items: center;
  background: var(--bg-elevated);
  border-radius: var(--radius);
  border: 1px solid rgba(28, 36, 34, 0.08);
  padding: 1.2rem;
}

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

.error-page {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 4rem 1rem;
}

.error-page h1 {
  font-size: clamp(3rem, 8vw, 5rem);
  margin: 0 0 0.5rem;
}

/* Cookie banner */
.cookie-banner {
  position: fixed;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 60;
  max-width: 720px;
  margin-inline: auto;
  background: var(--bg-elevated);
  border: 1px solid rgba(28, 36, 34, 0.12);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  animation: rise 0.45s ease both;
}

.cookie-banner__inner {
  padding: 1.1rem 1.2rem;
  display: grid;
  gap: 0.9rem;
}

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

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

/* Footer */
.site-footer {
  margin-top: 3rem;
  border-top: 1px solid rgba(28, 36, 34, 0.1);
  background: #eef2ef;
  padding: 3rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.4fr 1fr;
  gap: 1.8rem;
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--ink);
  margin: 0 0 0.4rem;
}

.footer-brand__tag,
.footer-address {
  font-style: normal;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.footer-heading {
  font-size: 0.95rem;
  margin: 0 0 0.7rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.4rem;
}

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

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

.footer-bottom {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(28, 36, 34, 0.08);
  font-size: 0.88rem;
  color: #66736f;
}

.article {
  max-width: 44rem;
}

.article-hero-img {
  border-radius: var(--radius);
  overflow: hidden;
  margin: 1.5rem 0 2rem;
}

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

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slow-zoom {
  from {
    transform: scale(1.03);
  }
  to {
    transform: scale(1.08);
  }
}

@media (max-width: 960px) {
  .course-grid,
  .blog-grid,
  .tier-grid,
  .tier-grid--4,
  .footer-grid,
  .split,
  .proof-row {
    grid-template-columns: 1fr 1fr;
  }

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

  .cta-band {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(247, 248, 246, 0.98);
    border-bottom: 1px solid rgba(28, 36, 34, 0.08);
    padding: 1rem 1.25rem 1.25rem;
    flex-direction: column;
    align-items: flex-start;
  }

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

  .site-header {
    position: sticky;
  }

  .header-bar {
    position: relative;
  }
}

@media (max-width: 640px) {
  .course-grid,
  .blog-grid,
  .tier-grid,
  .tier-grid--4,
  .card-grid,
  .footer-grid,
  .proof-row,
  .instructor {
    grid-template-columns: 1fr;
  }

  .hero__content {
    padding-top: 6rem;
  }
}