:root {
  --ink: #1c2430;
  --ink-soft: #3a4556;
  --muted: #6b7585;
  --line: rgba(28, 36, 48, 0.12);
  --paper: #f3f5f7;
  --paper-deep: #e6eaef;
  --surface: #ffffff;
  --accent: #9a7b4f;
  --accent-deep: #7a623c;
  --accent-soft: rgba(154, 123, 79, 0.14);
  --teal: #2f4f5c;
  --success: #2f6b4f;
  --danger: #8b3a3a;
  --shadow: 0 18px 40px rgba(28, 36, 48, 0.08);
  --radius: 4px;
  --font-display: "Gowun Batang", "Noto Serif KR", Georgia, serif;
  --font-body: "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;
  --max: 1120px;
  --header-h: 72px;
  --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);
  font-weight: 400;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(154, 123, 79, 0.12), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(47, 79, 92, 0.1), transparent 50%),
    linear-gradient(180deg, #f7f8fa 0%, var(--paper) 40%, var(--paper-deep) 100%);
  background-attachment: fixed;
  line-height: 1.7;
  min-height: 100vh;
}

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

a {
  color: var(--accent-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 0.6em;
}

p {
  margin: 0 0 1em;
}

ul, ol {
  margin: 0 0 1em;
  padding-left: 1.2em;
}

.sr-only {
  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;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(243, 245, 247, 0.86);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  width: 1.55rem;
  height: 1.55rem;
  border: 1.5px solid var(--accent);
  transform: rotate(45deg);
  box-shadow: inset 0 0 0 4px var(--paper);
  background: linear-gradient(135deg, var(--accent-soft), transparent);
}

.brand-text {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.nav-list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 1.35rem;
  margin: 0;
  padding: 0;
}

.nav-list a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.92rem;
  letter-spacing: 0.01em;
}

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

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.95rem;
  border: 1px solid var(--accent);
  color: var(--accent-deep) !important;
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}

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

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line);
  background: var(--surface);
  cursor: pointer;
  position: relative;
}

.nav-toggle-bar,
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0.55rem;
  right: 0.55rem;
  height: 1.5px;
  background: var(--ink);
  transition: transform 0.25s var(--ease);
}

.nav-toggle-bar {
  top: 50%;
}

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

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

.nav-toggle[aria-expanded="true"] .nav-toggle-bar {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar::after {
  top: 0;
  transform: rotate(-45deg);
}

@media (max-width: 900px) {
  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.35s var(--ease), opacity 0.25s var(--ease);
  }

  .site-nav.is-open {
    max-height: 420px;
    opacity: 1;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 1.25rem 1.4rem;
    gap: 0.85rem;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.85rem 1.4rem;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

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

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

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

.btn-ghost:hover {
  background: var(--ink);
  color: #fff;
}

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

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

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-deep);
  margin-bottom: 0.9rem;
}

.section {
  padding: 5.5rem 0;
}

.section-tight {
  padding: 3.5rem 0;
}

.section-title {
  font-size: clamp(1.8rem, 3vw, 2.55rem);
  max-width: 18ch;
}

.section-lead {
  color: var(--ink-soft);
  max-width: 42ch;
  font-size: 1.05rem;
}

.split {
  display: grid;
  gap: 2.5rem;
}

@media (min-width: 880px) {
  .split-2 {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }

  .split-aside {
    grid-template-columns: 0.85fr 1.15fr;
  }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

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

.hero-editorial {
  padding: 4.5rem 0 3rem;
  position: relative;
  overflow: hidden;
}

.hero-editorial::before {
  content: "";
  position: absolute;
  inset: 8% auto auto 55%;
  width: min(48vw, 520px);
  height: min(48vw, 520px);
  border: 1px solid rgba(154, 123, 79, 0.35);
  border-radius: 50%;
  animation: drift 14s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes drift {
  from { transform: translate(0, 0); }
  to { transform: translate(-18px, 24px); }
}

.hero-grid {
  display: grid;
  gap: 2rem;
}

@media (min-width: 960px) {
  .hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 3rem;
    align-items: end;
  }
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  line-height: 1.05;
  margin: 0 0 1.2rem;
  max-width: 10ch;
}

.hero-kicker {
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 34ch;
  margin-bottom: 1.8rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.hero-meta strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.55rem;
  color: var(--ink);
}

.hero-meta span {
  font-size: 0.85rem;
  color: var(--muted);
}

.hero-visual {
  position: relative;
  min-height: 360px;
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 360px;
  filter: saturate(0.92) contrast(1.05);
  animation: fadeRise 1.1s var(--ease) both;
}

@keyframes fadeRise {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: none; }
}

.hero-caption {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  right: 1rem;
  background: rgba(28, 36, 48, 0.78);
  color: #f5f2ea;
  padding: 0.9rem 1rem;
  font-size: 0.88rem;
  backdrop-filter: blur(8px);
}

.proof-strip {
  border-block: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding: 1.8rem 0;
  text-align: center;
}

.proof-grid strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.8rem;
}

.proof-grid span {
  color: var(--muted);
  font-size: 0.88rem;
}

@media (max-width: 700px) {
  .proof-grid {
    grid-template-columns: 1fr;
  }
}

.media-card {
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  overflow: hidden;
  height: 100%;
  display: flex;
  flex-direction: column;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.media-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 48px rgba(28, 36, 48, 0.12);
}

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

.media-card .body {
  padding: 1.35rem 1.4rem 1.55rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.media-card h3 {
  font-size: 1.25rem;
  margin: 0;
}

.media-card p {
  color: var(--ink-soft);
  margin: 0;
  flex: 1;
}

.media-card .meta {
  font-size: 0.82rem;
  color: var(--muted);
}

.card-grid {
  display: grid;
  gap: 1.4rem;
}

@media (min-width: 760px) {
  .card-grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

.feature-list li {
  padding: 1.2rem 1.3rem;
  background: rgba(255, 255, 255, 0.7);
  border-left: 2px solid var(--accent);
}

.feature-list h3 {
  font-size: 1.15rem;
  margin-bottom: 0.35rem;
}

.feature-list p {
  margin: 0;
  color: var(--ink-soft);
}

.quote-block {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1.6rem 1.5rem;
  position: relative;
}

.quote-block::before {
  content: "“";
  font-family: var(--font-display);
  font-size: 3rem;
  color: var(--accent);
  line-height: 1;
  position: absolute;
  top: 0.4rem;
  left: 1rem;
  opacity: 0.55;
}

.quote-block p {
  margin: 0.6rem 0 1rem;
  position: relative;
}

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

.quote-block .stars {
  color: var(--accent-deep);
  letter-spacing: 0.08em;
  font-size: 0.85rem;
}

.tier {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1.8rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  height: 100%;
}

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

.tier.featured::after {
  content: "추천";
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--accent-deep);
}

.tier h3 {
  font-size: 1.4rem;
  margin: 0;
}

.tier .price {
  font-family: var(--font-display);
  font-size: 2rem;
}

.tier .price span {
  font-size: 0.95rem;
  color: var(--muted);
  font-family: var(--font-body);
}

.tier ul {
  padding-left: 1.1em;
  color: var(--ink-soft);
  flex: 1;
}

.panel {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  padding: 1.6rem;
}

.page-hero {
  padding: 3.8rem 0 2.2rem;
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  font-size: clamp(2rem, 4vw, 3.1rem);
  max-width: 16ch;
}

.page-hero p {
  max-width: 48ch;
  color: var(--ink-soft);
}

.prose {
  max-width: 68ch;
}

.prose h2 {
  margin-top: 2.2rem;
  font-size: 1.55rem;
}

.prose h3 {
  margin-top: 1.6rem;
  font-size: 1.2rem;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 1.2rem 0 1.8rem;
}

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

.prose th {
  background: rgba(255, 255, 255, 0.8);
  font-weight: 600;
}

.form {
  display: grid;
  gap: 1.1rem;
}

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

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

.form input,
.form select,
.form textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 0.8rem 0.9rem;
  font: inherit;
  color: var(--ink);
}

.form input:focus,
.form select:focus,
.form textarea:focus {
  outline: 2px solid rgba(154, 123, 79, 0.45);
  outline-offset: 1px;
}

.form .error {
  color: var(--danger);
  font-size: 0.85rem;
  min-height: 1.2em;
}

.form-status {
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  display: none;
}

.form-status.is-success {
  display: block;
  border-color: var(--success);
  color: var(--success);
  background: rgba(47, 107, 79, 0.08);
}

.form-status.is-error {
  display: block;
  border-color: var(--danger);
  color: var(--danger);
  background: rgba(139, 58, 58, 0.08);
}

.inline-error {
  margin: 1rem 0;
  padding: 0.85rem 1rem;
  border: 1px solid var(--danger);
  color: var(--danger);
  background: rgba(139, 58, 58, 0.06);
}

.modules {
  display: grid;
  gap: 0.9rem;
}

.module {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 0.8rem;
  padding: 1rem 1.1rem;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid var(--line);
}

.module .num {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--accent-deep);
}

.faq details {
  border-bottom: 1px solid var(--line);
  padding: 0.9rem 0;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  float: right;
  color: var(--accent-deep);
}

.faq details[open] summary::after {
  content: "–";
}

.faq p {
  margin: 0.7rem 0 0.2rem;
  color: var(--ink-soft);
}

.instructor {
  display: grid;
  gap: 1.2rem;
  align-items: center;
}

@media (min-width: 700px) {
  .instructor {
    grid-template-columns: 180px 1fr;
  }
}

.instructor img {
  width: 180px;
  height: 180px;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--accent-soft);
}

.cta-band {
  background: linear-gradient(135deg, var(--ink) 0%, var(--teal) 100%);
  color: #f4f1ea;
  padding: 3.5rem 0;
  margin-top: 2rem;
}

.cta-band h2 {
  color: #fff;
  max-width: 16ch;
}

.cta-band p {
  color: rgba(255, 255, 255, 0.82);
  max-width: 42ch;
}

.cta-band .btn-primary {
  background: var(--accent);
}

.cta-band .btn-primary:hover {
  background: #b89458;
}

.site-footer {
  margin-top: 4rem;
  background: #161c26;
  color: rgba(245, 242, 234, 0.82);
  padding: 3.5rem 0 1.8rem;
}

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

.footer-name {
  font-family: var(--font-display);
  font-size: 1.45rem;
  color: #fff;
  margin-bottom: 0.4rem;
}

.footer-tag {
  max-width: 36ch;
  color: rgba(245, 242, 234, 0.65);
}

.footer-cols {
  display: grid;
  gap: 1.8rem;
  margin: 2.4rem 0 2rem;
}

@media (min-width: 800px) {
  .footer-cols {
    grid-template-columns: repeat(4, 1fr);
  }
}

.footer-heading {
  color: #fff;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}

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

.footer-col li + li {
  margin-top: 0.45rem;
}

.footer-col a {
  color: rgba(245, 242, 234, 0.75);
  text-decoration: none;
}

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

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.2rem;
  font-size: 0.85rem;
  color: rgba(245, 242, 234, 0.55);
}

.cookie-banner {
  position: fixed;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 200;
  max-width: 520px;
  margin-inline: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 1.2rem 1.25rem;
  display: none;
}

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

.cookie-banner p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin-bottom: 1rem;
}

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

.not-found {
  min-height: 55vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 4rem 1rem;
}

.not-found .code {
  font-family: var(--font-display);
  font-size: clamp(4rem, 12vw, 7rem);
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.4rem;
}

.blog-meta {
  color: var(--muted);
  font-size: 0.88rem;
  margin-bottom: 1.5rem;
}

.case-study {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1.8rem;
  margin-bottom: 1.4rem;
}

.case-study h3 {
  margin-bottom: 0.5rem;
}

.rating-row {
  display: flex;
  gap: 0.35rem;
  color: var(--accent-deep);
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
}