:root {
  --bg: #ffffff;
  --bg-soft: #f4f7f7;
  --bg-tint: #eaf3f2;
  --ink: #162022;
  --ink-soft: #4a585c;
  --line: #d7e2e1;
  --accent: #1f5c5c;
  --accent-hover: #164646;
  --accent-soft: #7ec8c0;
  --accent-wash: #dff0ee;
  --warn: #9a4a3a;
  --ok: #2a6b4f;
  --shadow: 0 18px 50px rgba(22, 32, 34, 0.08);
  --radius: 12px;
  --font-display: "Fraunces", "Noto Serif KR", Georgia, serif;
  --font-body: "Pretendard", "Noto Sans KR", "Apple SD Gothic Neo", 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 500px at 10% -10%, #e8f4f3 0%, transparent 55%),
    radial-gradient(900px 420px at 100% 0%, #f0f5f2 0%, transparent 50%),
    var(--bg);
  line-height: 1.65;
  min-height: 100vh;
}

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

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

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 0.6em;
}

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

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

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid rgba(215, 226, 225, 0.8);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  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-soft), var(--accent));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.25);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 650;
  letter-spacing: -0.03em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.15rem;
}

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

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

.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  transition: background 0.2s ease, transform 0.2s ease;
}

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

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line);
  border-radius: 0.6rem;
  background: #fff;
  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: 0 auto;
  position: relative;
}

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

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

@media (max-width: 960px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: calc(var(--header-h) + 0.4rem);
    left: 1.25rem;
    right: 1.25rem;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
    animation: navIn 0.25s ease;
  }

  .site-nav a {
    padding: 0.85rem 1rem;
    border-radius: 0.5rem;
  }

  .nav-cta {
    text-align: center;
    margin-top: 0.35rem;
  }
}

@keyframes navIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.85rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  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-hover);
  color: #fff;
}

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

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

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Hero variants */
.hero-home {
  padding: 4.5rem 0 3.5rem;
  position: relative;
  overflow: hidden;
}

.hero-home::before {
  content: "";
  position: absolute;
  inset: auto -10% -20% 40%;
  height: 70%;
  background:
    linear-gradient(120deg, transparent 10%, rgba(126, 200, 192, 0.18), transparent 70%);
  pointer-events: none;
  animation: drift 14s ease-in-out infinite alternate;
}

@keyframes drift {
  from { transform: translateX(0); }
  to { transform: translateX(-40px); }
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 5.4rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin: 0 0 1.25rem;
  color: var(--ink);
  animation: rise 0.7s ease both;
}

.hero-lead {
  max-width: 36rem;
  font-size: 1.15rem;
  margin-bottom: 1.75rem;
  animation: rise 0.7s ease 0.1s both;
}

.hero-actions {
  animation: rise 0.7s ease 0.2s both;
}

.hero-visual {
  margin-top: 3rem;
  border-radius: 0;
  overflow: hidden;
  min-height: clamp(220px, 38vw, 420px);
  position: relative;
  animation: fadeUp 0.9s ease 0.25s both;
}

.hero-visual img {
  width: 100%;
  height: clamp(220px, 38vw, 420px);
  object-fit: cover;
  filter: saturate(0.92) contrast(1.02);
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 45%, rgba(22, 32, 34, 0.28));
  pointer-events: none;
}

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

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-hero {
  padding: 3.5rem 0 2rem;
}

.page-hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.1rem);
}

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

.full-bleed {
  width: 100vw;
  margin-left: calc(50% - 50vw);
}

.full-bleed img {
  width: 100%;
  height: clamp(200px, 32vw, 360px);
  object-fit: cover;
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section-tight {
  padding: 2.5rem 0;
}

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

.section-label {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  margin-bottom: 0.75rem;
}

.section-intro {
  max-width: 38rem;
  margin-bottom: 2rem;
}

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

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

.proof-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  padding: 1.5rem 0;
  border-block: 1px solid var(--line);
}

.proof-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.85rem;
  color: var(--ink);
  letter-spacing: -0.03em;
}

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

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

.feature-list {
  display: grid;
  gap: 1.5rem;
}

.feature-item h3 {
  font-size: 1.2rem;
  margin-bottom: 0.35rem;
}

.feature-item p {
  margin: 0;
}

.course-grid,
.blog-grid,
.tier-grid,
.review-grid {
  display: grid;
  gap: 1.5rem;
}

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

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

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

@media (max-width: 900px) {
  .course-grid,
  .blog-grid,
  .tier-grid {
    grid-template-columns: 1fr;
  }
}

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

.course-tile,
.blog-tile {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  text-decoration: none;
  color: inherit;
  transition: transform 0.25s ease;
}

.course-tile:hover,
.blog-tile:hover {
  transform: translateY(-4px);
}

.course-tile img,
.blog-tile img,
.media-frame img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 0;
}

.course-tile h3,
.blog-tile h3 {
  font-size: 1.2rem;
  margin: 0;
  color: var(--ink);
}

.course-tile p,
.blog-tile p {
  margin: 0;
  font-size: 0.95rem;
}

.meta-line {
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.quote-block {
  border-left: 3px solid var(--accent-soft);
  padding: 0.25rem 0 0.25rem 1.25rem;
  margin: 0;
}

.quote-block p {
  font-size: 1.05rem;
  color: var(--ink);
  margin-bottom: 0.75rem;
}

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

.case-study {
  padding: 1.75rem 0;
  border-top: 1px solid var(--line);
}

.case-study h3 {
  font-size: 1.35rem;
}

.tier {
  padding: 1.75rem;
  border: 1px solid var(--line);
  background: #fff;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-height: 100%;
}

.tier-featured {
  border-color: var(--accent);
  background: linear-gradient(180deg, var(--accent-wash), #fff 42%);
}

.tier h3 {
  margin: 0;
  font-size: 1.35rem;
}

.tier .price {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--ink);
  letter-spacing: -0.03em;
}

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

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

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

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

.faq summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ink);
  list-style: none;
}

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

.faq details[open] summary {
  color: var(--accent);
}

.faq details p {
  margin: 0.75rem 0 0.25rem;
}

/* Forms */
.form {
  display: grid;
  gap: 1rem;
  max-width: 36rem;
}

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

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

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  padding: 0.8rem 0.95rem;
  font: inherit;
  background: #fff;
  color: var(--ink);
}

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

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

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

.form-status {
  padding: 0.85rem 1rem;
  border-radius: 0.65rem;
  display: none;
}

.form-status.is-success {
  display: block;
  background: #e7f4ec;
  color: var(--ok);
}

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

.contact-panel {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
}

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

.contact-aside {
  background: var(--bg-soft);
  padding: 1.5rem;
  border: 1px solid var(--line);
}

.contact-aside h2 {
  font-size: 1.25rem;
}

.contact-aside p {
  margin-bottom: 0.85rem;
}

/* Legal */
.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 var(--line);
  padding: 0.7rem 0.8rem;
  text-align: left;
  vertical-align: top;
}

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

/* Cookie banner */
.cookie-banner {
  position: fixed;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 60;
  max-width: 520px;
  margin-inline: auto;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 1.15rem 1.25rem;
  display: none;
}

.cookie-banner.is-visible {
  display: block;
  animation: rise 0.35s ease;
}

.cookie-banner p {
  margin: 0 0 1rem;
  font-size: 0.92rem;
}

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

.inline-error {
  margin: 0.75rem 0;
  padding: 0.75rem 1rem;
  background: #f8ebe8;
  color: var(--warn);
  border-radius: 0.5rem;
  display: none;
}

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

/* Module list */
.module-list {
  counter-reset: mod;
  list-style: none;
  padding: 0;
  margin: 0;
}

.module-list li {
  counter-increment: mod;
  padding: 1.1rem 0 1.1rem 3rem;
  border-bottom: 1px solid var(--line);
  position: relative;
}

.module-list li::before {
  content: counter(mod, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1.1rem;
  font-family: var(--font-display);
  color: var(--accent);
  font-weight: 650;
}

.module-list h3 {
  font-size: 1.1rem;
  margin-bottom: 0.3rem;
}

.module-list p {
  margin: 0;
}

.avatar-row {
  display: flex;
  gap: 1.25rem;
  align-items: center;
}

.avatar-row img {
  width: 88px;
  height: 88px;
  object-fit: cover;
  border-radius: 50%;
}

/* Footer */
.site-footer {
  margin-top: 4rem;
  padding: 3rem 0 2rem;
  background: var(--ink);
  color: #d7e2e1;
}

.site-footer a {
  color: #b9cbc9;
  text-decoration: none;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.3fr;
  gap: 2rem;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: #fff;
  margin: 0 0 0.6rem;
}

.footer-tag,
.footer-meta {
  color: #a8bbb9;
  font-size: 0.92rem;
}

.footer-heading {
  color: #fff;
  font-weight: 650;
  margin: 0 0 0.75rem;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.footer-bottom {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
  font-size: 0.88rem;
  color: #8fa3a1;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

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

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* 404 */
.error-page {
  min-height: 60vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 4rem 0;
}

.error-page h1 {
  font-size: clamp(3rem, 10vw, 6rem);
  margin-bottom: 0.3rem;
}

.rating {
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.prose > * + * {
  margin-top: 1rem;
}

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

.prose ul {
  color: var(--ink-soft);
  padding-left: 1.2rem;
}

.media-wide {
  margin: 1.5rem 0 2rem;
}

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

.chip-muted {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}