:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --text: #172033;
  --muted: #5b6475;
  --surface: #f6f7f9;
  --border: #d9dee8;
  --accent: #2457ff;
  --accent-text: #ffffff;
  --warm: #f2b84b;
  --mint: #2f9f7b;
  --rose: #d96c73;
  --ink-soft: #33415c;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --text: #f5f7fb;
    --muted: #b9c0cc;
    --surface: #171b24;
    --border: #2c3342;
    --accent: #8ea2ff;
    --accent-text: #0f1117;
    --warm: #f6c66d;
    --mint: #70d7b4;
    --rose: #f09aa0;
    --ink-soft: #d9dfec;
  }
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  color: var(--text);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  line-height: 1.6;
  overflow-x: hidden;
}

img,
svg,
video {
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 1rem;
  background: var(--accent);
  color: var(--accent-text);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
}

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

.site-header,
.site-footer {
  padding: 1rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid var(--border);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(16px);
}

.site-footer {
  border-top: 1px solid var(--border);
  border-bottom: 0;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(0.65rem, 2vw, 1rem);
  align-items: center;
}

.brand {
  font-weight: 700;
  margin-right: auto;
  text-decoration: none;
}

.hero,
.page-section {
  max-width: 72rem;
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 7rem) clamp(1rem, 4vw, 3rem);
  scroll-margin-top: 5.5rem;
}

.band {
  max-width: none;
  border-block: 1px solid var(--border);
  background:
    linear-gradient(120deg, color-mix(in srgb, var(--surface) 92%, var(--mint)), var(--surface));
}

.band > * {
  max-width: 72rem;
  margin-inline: auto;
}

.eyebrow {
  color: var(--muted);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

h1 {
  font-size: clamp(2.25rem, 6vw, 4.5rem);
  line-height: 1.05;
  max-width: 12ch;
}

h2 {
  margin-top: 2.5rem;
  max-width: 18ch;
  font-size: clamp(1.7rem, 4vw, 3rem);
  line-height: 1.25;
}

h3 {
  margin: 0.9rem 0 0.4rem;
  font-size: 1.05rem;
}

.hero p {
  max-width: 60ch;
  color: var(--muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.2rem;
  border-radius: 999px;
  padding: 0.85rem 1.2rem;
  background: var(--accent);
  color: var(--accent-text);
  text-decoration: none;
  font-weight: 700;
}

.button.secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.single-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(20rem, 0.85fr);
  gap: clamp(2rem, 7vw, 5rem);
  min-height: calc(100svh - 5rem);
  padding-block: clamp(3rem, 6vw, 5rem);
  align-items: center;
}

.hero-copy {
  min-width: 0;
}

.hangul-stage {
  position: relative;
  min-height: clamp(25rem, 48vw, 36rem);
  overflow: hidden;
  isolation: isolate;
}

.hangul-stage::before {
  content: "\3131  \3134  \3137  \3139  \3141  \3142  \3145  \3147  \3148  \314a  \314b  \314c  \314d  \314e  \314f  \3153  \3157  \315c  \3161  \3163";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: color-mix(in srgb, var(--muted) 18%, transparent);
  font-size: clamp(2rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.8;
  text-align: center;
  transform: rotate(-8deg);
  z-index: -1;
}

.glyph {
  position: absolute;
  display: grid;
  width: clamp(4.5rem, 9vw, 7rem);
  aspect-ratio: 1;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--bg);
  box-shadow: 0 1rem 3rem color-mix(in srgb, var(--text) 10%, transparent);
  font-size: clamp(2.1rem, 6vw, 4rem);
  font-weight: 900;
  animation: float-glyph 6s ease-in-out infinite;
}

.glyph-one {
  top: 8%;
  left: 8%;
  color: var(--accent);
}

.glyph-two {
  top: 16%;
  right: 8%;
  color: var(--rose);
  animation-delay: -1.4s;
}

.glyph-three {
  bottom: 16%;
  left: 2%;
  color: var(--mint);
  animation-delay: -2.2s;
}

.glyph-four {
  right: 0;
  bottom: 12%;
  color: var(--warm);
  animation-delay: -3.4s;
}

.glyph-five {
  top: 42%;
  left: 40%;
  color: var(--ink-soft);
  animation-delay: -4.2s;
}

.syllable-card {
  position: absolute;
  left: 50%;
  top: 50%;
  width: min(18rem, 70vw);
  padding: 1.2rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: color-mix(in srgb, var(--bg) 94%, var(--warm));
  box-shadow: 0 1.25rem 4rem color-mix(in srgb, var(--text) 16%, transparent);
  transform: translate(-50%, -50%);
}

.syllable-card strong {
  display: block;
  margin: 0.5rem 0;
  font-size: clamp(5rem, 16vw, 8rem);
  line-height: 0.95;
}

.syllable-card > span:last-child {
  color: var(--muted);
}

.jamo-row {
  display: flex;
  gap: 0.45rem;
}

.jamo-row span,
.block-builder span {
  display: grid;
  min-width: 2.2rem;
  min-height: 2.2rem;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--surface);
  font-weight: 800;
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.principle-grid article {
  min-height: 17rem;
  padding: 1.1rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--bg);
}

.principle-letter {
  display: block;
  min-height: 5rem;
  font-size: clamp(2.4rem, 7vw, 4.5rem);
  font-weight: 900;
  line-height: 1;
  color: var(--accent);
}

.principle-grid article:nth-child(2) .principle-letter {
  color: var(--mint);
}

.principle-grid article:nth-child(3) .principle-letter {
  color: var(--rose);
}

.principle-grid p {
  color: var(--muted);
}

.block-builder {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.block-builder div {
  display: grid;
  grid-template-columns: repeat(3, minmax(2.2rem, 1fr));
  gap: 0.45rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--bg);
  transition: transform 180ms ease, border-color 180ms ease;
}

.block-builder div:hover {
  border-color: var(--accent);
  transform: translateY(-0.18rem);
}

.block-builder strong {
  grid-column: 1 / -1;
  padding-top: 0.4rem;
  font-size: clamp(3.2rem, 8vw, 5.5rem);
  line-height: 1;
}

.learning-path,
.process-drawing {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.85rem;
  list-style: none;
  margin: 3rem 0 0;
  padding: 0;
}

.process-drawing {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  width: 100%;
  margin: 3rem auto 2rem;
}

.learning-path li,
.process-drawing li {
  position: relative;
  min-height: 12rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--surface) 85%, var(--warm)), var(--surface));
}

.learning-path li::after,
.process-drawing li::after {
  content: "";
  position: absolute;
  top: 2.05rem;
  right: -0.85rem;
  width: 0.85rem;
  border-top: 2px solid var(--border);
}

.learning-path li:last-child::after,
.process-drawing li:last-child::after {
  display: none;
}

.path-mark,
.process-icon {
  display: inline-grid;
  width: 2.2rem;
  height: 2.2rem;
  place-items: center;
  margin-bottom: 1rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 800;
}

.learning-path li:nth-child(2) .path-mark,
.process-drawing li:nth-child(2) .process-icon {
  background: var(--mint);
}

.learning-path li:nth-child(3) .path-mark,
.process-drawing li:nth-child(3) .process-icon {
  background: var(--warm);
  color: #172033;
}

.learning-path li:nth-child(4) .path-mark {
  background: var(--rose);
}

.learning-path strong,
.process-drawing strong {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 1rem;
}

.learning-path span:last-child,
.process-drawing span:last-child {
  display: block;
  color: var(--muted);
  font-size: 0.95rem;
}

.table-wrap {
  width: 100%;
  margin-top: 2rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
}

.table-wrap:focus {
  outline: 3px solid color-mix(in srgb, var(--accent) 55%, transparent);
  outline-offset: 0.25rem;
}

table {
  width: 100%;
  min-width: 56rem;
  border-collapse: collapse;
  background: var(--bg);
}

caption {
  padding: 1rem;
  color: var(--text);
  font-weight: 800;
  text-align: left;
  background: color-mix(in srgb, var(--surface) 82%, var(--mint));
}

th,
td {
  padding: 0.9rem 1rem;
  border-top: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

thead th {
  color: var(--ink-soft);
  background: var(--surface);
}

tbody th {
  width: 22%;
}

.cost-list {
  display: grid;
  gap: 0.35rem;
  margin: 0;
  padding-left: 1.1rem;
}

.phrase-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 2rem;
}

.phrase-strip span {
  min-height: 5.5rem;
  display: grid;
  place-items: center;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--bg);
  font-size: clamp(1.1rem, 3vw, 1.8rem);
  font-weight: 800;
  text-align: center;
}

.availability-note {
  max-width: 62rem;
  margin-top: 1.25rem;
  padding: 1rem;
  border-left: 0.25rem solid var(--mint);
  background: color-mix(in srgb, var(--bg) 88%, var(--mint));
  font-weight: 700;
}

.format-footnotes {
  display: grid;
  gap: 0.65rem;
  max-width: 62rem;
  margin: 1rem auto 0;
  padding: 0;
  color: var(--muted);
  font-size: 0.95rem;
  list-style: none;
}

.format-footnotes li {
  position: relative;
  padding: 0.85rem 0.95rem 0.85rem 2.7rem;
  border-left: 0.25rem solid var(--warm);
  background: color-mix(in srgb, var(--bg) 90%, var(--warm));
}

.format-footnotes li:nth-child(2) {
  border-left-color: var(--mint);
  background: color-mix(in srgb, var(--bg) 90%, var(--mint));
}

.format-footnotes sup {
  position: absolute;
  top: 0.85rem;
  left: 0.95rem;
  color: var(--text);
  font-weight: 800;
  line-height: 1;
}

.about-profile {
  display: grid;
  grid-template-columns: minmax(7rem, 0.28fr) minmax(0, 1fr);
  gap: clamp(1.25rem, 4vw, 2.5rem);
  align-items: start;
  margin-top: 2rem;
  padding: clamp(1rem, 4vw, 2rem);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: color-mix(in srgb, var(--surface) 74%, var(--bg));
}

.about-profile h2 {
  margin-top: 0;
}

.about-profile p {
  max-width: 62ch;
}

.profile-mark {
  display: grid;
  min-height: 8rem;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--bg);
  color: var(--accent);
  font-size: clamp(2.8rem, 9vw, 5rem);
  font-weight: 900;
  line-height: 1;
  text-align: center;
}

.profile-points,
.privacy-list {
  display: grid;
  gap: 0.75rem;
  max-width: 68ch;
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
}

.profile-points li,
.privacy-list li {
  border-left: 0.25rem solid var(--accent);
  padding: 0.7rem 0 0.7rem 0.9rem;
  background: color-mix(in srgb, var(--surface) 72%, transparent);
}

.contact-form {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
  padding: clamp(1rem, 3vw, 1.5rem);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--bg);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  align-items: start;
}

.availability-field {
  grid-column: 1 / -1;
}

.contact-form label,
.contact-form fieldset {
  display: grid;
  align-content: start;
  gap: 0.45rem;
  min-width: 0;
}

.contact-form label span,
.contact-form legend {
  font-weight: 800;
}

.field-help {
  display: block;
  min-height: 1.35rem;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.85rem 0.9rem;
  background: var(--surface);
  color: var(--text);
  font: inherit;
}

.contact-form input:not([type="radio"]):not([type="checkbox"]),
.contact-form select {
  min-height: 3.35rem;
}

.contact-form textarea {
  min-height: 11rem;
  resize: vertical;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent);
  outline-offset: 0.15rem;
  border-color: var(--accent);
}

.contact-form fieldset {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  border: 0;
  padding: 0;
}

.contact-form legend {
  grid-column: 1 / -1;
  padding: 0;
}

.contact-form fieldset label,
.contact-form .consent-line {
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 0.55rem;
  padding: 0.8rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--surface);
}

.contact-form .consent-line span {
  min-width: 0;
  flex: 1;
}

.contact-form .consent-line input[type="checkbox"] {
  flex: 0 0 auto;
  margin: 0.28rem 0 0;
}

.contact-form input[type="radio"],
.contact-form input[type="checkbox"] {
  width: auto;
  margin-top: 0.28rem;
  accent-color: var(--accent);
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.contact-form button {
  border: 0;
  cursor: pointer;
  font: inherit;
}

.contact-form button:disabled {
  cursor: not-allowed;
  opacity: 0.72;
}

.form-status {
  max-width: 34rem;
  margin: 0;
  color: var(--muted);
}

.reveal {
  opacity: 1;
  transform: none;
}

.js-enabled .reveal {
  opacity: 0;
  transform: translateY(1.5rem);
  transition: opacity 600ms ease, transform 600ms ease;
}

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

@keyframes float-glyph {
  0%,
  100% {
    transform: translateY(0) rotate(-3deg);
  }

  50% {
    transform: translateY(-0.8rem) rotate(3deg);
  }
}

@media (max-width: 760px) {
  .single-hero,
  .principle-grid,
  .block-builder,
  .phrase-strip,
  .about-profile,
  .form-grid,
  .contact-form fieldset {
    grid-template-columns: 1fr;
  }

  .single-hero {
    min-height: auto;
  }

  .hangul-stage {
    min-height: 28rem;
  }

  .learning-path,
  .process-drawing {
    grid-template-columns: 1fr;
  }

  .learning-path li,
  .process-drawing li {
    min-height: auto;
  }

  .learning-path li::after,
  .process-drawing li::after {
    top: auto;
    right: auto;
    bottom: -0.85rem;
    left: 2rem;
    height: 0.85rem;
    border-top: 0;
    border-left: 2px solid var(--border);
  }

  table {
    min-width: 36rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .js-enabled .reveal,
  .reveal {
    opacity: 1;
    transform: none;
  }
}