:root {
  --paper: #f6efdf;
  --paper-strong: rgba(255, 251, 244, 0.82);
  --paper-soft: rgba(255, 248, 238, 0.68);
  --ink: #231d18;
  --muted: #665a4f;
  --accent: #b95d16;
  --accent-strong: #8f4310;
  --accent-soft: rgba(239, 179, 120, 0.28);
  --blue-soft: rgba(103, 138, 209, 0.16);
  --line: rgba(71, 56, 39, 0.12);
  --shadow: 0 24px 70px rgba(76, 54, 32, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "IBM Plex Sans KR", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  background:
    radial-gradient(circle at 12% 10%, rgba(246, 171, 92, 0.36), transparent 26%),
    radial-gradient(circle at 92% 18%, rgba(118, 149, 222, 0.24), transparent 28%),
    linear-gradient(160deg, #efe4cf 0%, #f8f5ee 48%, #e6edf8 100%);
}

.halo {
  position: fixed;
  width: 34vw;
  height: 34vw;
  border-radius: 999px;
  pointer-events: none;
  filter: blur(72px);
  opacity: 0.58;
}

.halo-left {
  top: -8vw;
  left: -10vw;
  background: rgba(230, 137, 53, 0.26);
}

.halo-right {
  right: -12vw;
  bottom: -14vw;
  background: rgba(88, 126, 214, 0.2);
}

.page {
  position: relative;
  z-index: 1;
  max-width: 1380px;
  margin: 0 auto;
  padding: 42px 20px 56px;
}

.masthead {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.7fr);
  gap: 20px;
  align-items: start;
  margin-bottom: 22px;
}

.eyebrow,
.panel-kicker,
.card-kicker {
  margin: 0;
  color: var(--muted);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.masthead-copy h1 {
  margin: 6px 0 0;
}

.title-main {
  display: block;
  font-family: "Iowan Old Style", "AppleMyungjo", serif;
  font-size: clamp(3.5rem, 8vw, 5.6rem);
  line-height: 0.88;
  letter-spacing: -0.04em;
}

.title-sub {
  display: block;
  max-width: 760px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.6;
  font-weight: 500;
}

.lede {
  max-width: 760px;
  margin: 16px 0 0;
  color: var(--muted);
  line-height: 1.72;
  font-size: 1rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.meta-pill,
.demo-chip {
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 251, 244, 0.82);
  box-shadow: 0 12px 32px rgba(82, 57, 35, 0.08);
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 8px 14px;
  color: var(--muted);
  font-size: 0.92rem;
}

.demo-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.masthead-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.masthead-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 10px 15px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 251, 244, 0.78);
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  box-shadow: 0 12px 32px rgba(82, 57, 35, 0.08);
}

.masthead-link:hover {
  border-color: rgba(185, 93, 22, 0.38);
  transform: translateY(-1px);
}

.masthead-link-primary {
  background: linear-gradient(135deg, #fff0d9, #ffdcb8);
  border-color: rgba(185, 93, 22, 0.38);
}

.demo-chip {
  cursor: pointer;
  padding: 11px 16px;
  color: var(--ink);
  font: inherit;
  font-weight: 600;
}

.demo-chip.is-active {
  border-color: rgba(185, 93, 22, 0.38);
  background: linear-gradient(135deg, #fff0d9, #ffdcb8);
}

.masthead-side {
  display: grid;
  gap: 14px;
}

.side-card {
  padding: 18px 18px 20px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 24px;
  background: var(--paper-strong);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
}

.side-card-accent {
  background:
    linear-gradient(135deg, rgba(255, 241, 219, 0.96), rgba(255, 249, 241, 0.9)),
    var(--paper-strong);
}

.side-card h2 {
  margin: 8px 0 10px;
  font-family: "Iowan Old Style", "AppleMyungjo", serif;
  font-size: 1.7rem;
  line-height: 1.08;
}

.side-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.syntax-showcase {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.syntax-example,
.lede code {
  display: block;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.62);
  padding: 10px 12px;
  color: var(--accent-strong);
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: 0.92rem;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: keep-all;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.16fr) minmax(360px, 0.84fr);
  gap: 20px;
  align-items: start;
}

.panel {
  min-width: 0;
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.74);
  border-radius: 28px;
  background: var(--paper-strong);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
}

.panel-editor {
  grid-column: 1;
}

.panel-output,
.panel-canvas {
  grid-column: 2;
}

.panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.panel-head h2 {
  margin: 6px 0 0;
  font-family: "Iowan Old Style", "AppleMyungjo", serif;
  font-size: 1.78rem;
  line-height: 1.05;
}

.panel-summary,
.status-text {
  color: var(--muted);
}

.panel-summary {
  margin: 10px 0 16px;
  line-height: 1.72;
}

.status-text {
  margin: 0;
  max-width: 220px;
  text-align: right;
  line-height: 1.5;
}

.run-button {
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), #d97b1d);
  color: #fff;
  font: inherit;
  font-weight: 700;
  padding: 12px 24px;
  cursor: pointer;
  box-shadow: 0 16px 34px rgba(185, 93, 22, 0.24);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.run-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 38px rgba(185, 93, 22, 0.28);
}

#editor,
#output,
.canvas-info {
  width: 100%;
  border: 1px solid rgba(77, 58, 38, 0.12);
  border-radius: 20px;
  background: rgba(255, 254, 251, 0.92);
  color: #2a231d;
  font-size: 0.97rem;
  line-height: 1.72;
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
}

.editor-wrap {
  position: relative;
  width: 100%;
}

#editorHighlight {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 18px;
  border: 1px solid transparent;
  border-radius: 20px;
  background: transparent;
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: 0.92rem;
  line-height: 1.58;
  white-space: pre;
  overflow: hidden;
  pointer-events: none;
}

#editor {
  min-height: 540px;
  resize: vertical;
  padding: 18px;
  font-size: 0.92rem;
  line-height: 1.58;
  white-space: pre;
  overflow-wrap: normal;
  word-break: normal;
  color: transparent;
  caret-color: #2a231d;
}

#output,
.canvas-info {
  margin: 14px 0 0;
  padding: 18px;
  white-space: pre-wrap;
  overflow: auto;
}

#output {
  min-height: 540px;
}

.panel-canvas {
  display: flex;
  flex-direction: column;
}

.canvas-wrap {
  margin-top: 14px;
  padding: 10px;
  border-radius: 24px;
  background: linear-gradient(180deg, #eef3ff, #f2f5ff);
  border: 1px solid rgba(70, 89, 139, 0.14);
}

#hanoiCanvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
  background: #f8f1dc;
}

.canvas-info {
  min-height: 104px;
  background: rgba(250, 247, 241, 0.95);
}

.is-hidden {
  display: none !important;
}

@media (max-width: 1040px) {
  .masthead,
  .workspace {
    grid-template-columns: 1fr;
  }

  .panel-output,
  .panel-canvas {
    grid-column: 1;
  }
}

@media (max-width: 720px) {
  .page {
    padding: 26px 14px 38px;
  }

  .panel,
  .side-card {
    padding: 18px;
    border-radius: 22px;
  }

  .panel-head {
    flex-direction: column;
  }

  .status-text {
    max-width: none;
    text-align: left;
  }

  #editor,
  #output {
    min-height: 360px;
  }

  .canvas-info {
    min-height: 96px;
  }
}

/* ==========================================================================
   Rosetta Stone — 3-column comparison page
   All classes prefixed with `rosetta-` to isolate from other pages.
   ========================================================================== */

.rosetta-header {
  text-align: center;
  margin-bottom: 36px;
}

.rosetta-title {
  font-family: "Iowan Old Style", "AppleMyungjo", serif;
  font-size: clamp(2.4rem, 6vw, 3.8rem);
  line-height: 0.92;
  letter-spacing: -0.03em;
  margin: 8px 0 0;
}

.rosetta-lead {
  max-width: 580px;
  margin: 14px auto 0;
  color: var(--muted);
  line-height: 1.72;
  font-size: 1rem;
}

.rosetta-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 18px;
}

.rosetta-wasm-status {
  display: inline-block;
  margin-top: 14px;
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.rosetta-wasm-status.is-ready {
  background: rgba(76, 175, 80, 0.14);
  color: #2e7d32;
}

.rosetta-wasm-status.is-error {
  background: rgba(211, 47, 47, 0.12);
  color: #c62828;
}

/* --- Section --- */

.rosetta-section {
  margin-bottom: 40px;
}

.rosetta-section-head {
  margin-bottom: 16px;
}

.rosetta-section-head h2 {
  font-family: "Iowan Old Style", "AppleMyungjo", serif;
  font-size: 1.5rem;
  line-height: 1.1;
  margin: 0;
}

.rosetta-description {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.rosetta-description code {
  background: rgba(255, 255, 255, 0.6);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: 0.88em;
  color: var(--accent-strong);
}

/* --- Tabs (mobile/tablet only) --- */

.rosetta-tabs {
  display: none;
  gap: 8px;
  margin-bottom: 12px;
}

.rosetta-tab {
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper-soft);
  color: var(--muted);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.rosetta-tab.is-active {
  border-color: rgba(185, 93, 22, 0.38);
  background: linear-gradient(135deg, #fff0d9, #ffdcb8);
  color: var(--ink);
}

/* --- 3-column grid --- */

.rosetta-example {
  margin-bottom: 16px;
}

.rosetta-columns {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
  align-items: start;
}

.rosetta-col {
  min-width: 0;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 18px;
  background: var(--paper-strong);
  backdrop-filter: blur(14px);
  box-shadow: 0 12px 32px rgba(82, 57, 35, 0.06);
}

.rosetta-col-ziium {
  border-color: rgba(185, 93, 22, 0.18);
  background:
    linear-gradient(135deg, rgba(255, 241, 219, 0.6), rgba(255, 249, 241, 0.5)),
    var(--paper-strong);
}

.rosetta-col-label {
  margin: 0 0 8px;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.rosetta-col pre {
  margin: 0;
  padding: 12px;
  border-radius: 12px;
  background: rgba(255, 254, 251, 0.88);
  border: 1px solid rgba(77, 58, 38, 0.08);
  overflow-x: auto;
}

.rosetta-col code {
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: 0.86rem;
  line-height: 1.6;
  color: #2a231d;
  white-space: pre;
}

/* --- Run button --- */

.rosetta-run {
  display: inline-flex;
  align-items: center;
  margin-top: 10px;
  padding: 7px 18px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), #d97b1d);
  color: #fff;
  font: inherit;
  font-size: 0.84rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(185, 93, 22, 0.2);
  transition: transform 140ms ease, box-shadow 140ms ease, opacity 140ms ease;
}

.rosetta-run:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(185, 93, 22, 0.26);
}

.rosetta-run:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.rosetta-fallback-link {
  display: inline-block;
  margin-top: 10px;
  padding: 7px 18px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.84rem;
  font-weight: 600;
  text-decoration: none;
}

.rosetta-fallback-link:hover {
  text-decoration: underline;
}

/* --- Output --- */

.rosetta-output {
  margin: 10px 0 0;
  padding: 10px 12px;
  min-height: 28px;
  border-radius: 10px;
  background: rgba(255, 254, 251, 0.88);
  border: 1px solid rgba(77, 58, 38, 0.08);
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: 0.84rem;
  line-height: 1.55;
  color: #2a231d;
  white-space: pre-wrap;
}

.rosetta-output:empty {
  display: none;
}

/* --- Responsive: tablet --- */

@media (max-width: 1040px) {
  .rosetta-tabs {
    display: flex;
  }

  .rosetta-col-label {
    display: none;
  }

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

  .rosetta-col {
    display: none;
  }

  .rosetta-col.is-active {
    display: block;
  }
}

/* --- Responsive: mobile --- */

@media (max-width: 720px) {
  .rosetta-section-head h2 {
    font-size: 1.3rem;
  }

  .rosetta-col {
    padding: 14px;
    border-radius: 16px;
  }

  .rosetta-col pre {
    padding: 10px;
    border-radius: 10px;
  }

  .rosetta-col code {
    font-size: 0.82rem;
  }
}

/* ==========================================================================
   Changelog — release notes
   ========================================================================== */

.cl-version {
  margin-bottom: 48px;
}

.cl-version-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 6px;
}

.cl-version-head h2 {
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: 1.8rem;
  line-height: 1.1;
  margin: 0;
}

.cl-date {
  font-size: 0.85rem;
  color: var(--muted);
}

.cl-tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.cl-tag-latest {
  background: rgba(76, 175, 80, 0.14);
  color: #2e7d32;
}

.cl-tag-research {
  background: var(--blue-soft);
  color: #3f5f9e;
}

.cl-summary {
  color: var(--muted);
  line-height: 1.72;
  margin: 0 0 22px;
  max-width: 680px;
}

.cl-section {
  margin-bottom: 24px;
}

.cl-section h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-strong);
  letter-spacing: 0.04em;
  margin: 0 0 12px;
}

.cl-entry {
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 18px;
  background: var(--paper-strong);
  backdrop-filter: blur(14px);
  box-shadow: 0 12px 32px rgba(82, 57, 35, 0.06);
  margin-bottom: 12px;
}

.cl-entry h4 {
  margin: 0 0 6px;
  font-size: 1.05rem;
  font-weight: 700;
}

.cl-entry p {
  margin: 0 0 12px;
  color: var(--muted);
  line-height: 1.65;
  font-size: 0.95rem;
}

.cl-entry p code {
  background: rgba(255, 255, 255, 0.6);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: 0.88em;
  color: var(--accent-strong);
}

.cl-code {
  margin: 0;
  padding: 14px;
  border-radius: 12px;
  background: rgba(255, 254, 251, 0.88);
  border: 1px solid rgba(77, 58, 38, 0.08);
  overflow-x: auto;
}

.cl-code code {
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: 0.86rem;
  line-height: 1.65;
  color: #2a231d;
  white-space: pre;
}

.cl-comment {
  color: var(--muted);
  font-style: italic;
}

.cl-fixes {
  margin: 0;
  padding-left: 20px;
}

.cl-fixes li {
  color: var(--ink);
  line-height: 1.72;
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.cl-fixes code {
  background: rgba(255, 255, 255, 0.6);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: 0.88em;
  color: var(--accent-strong);
}

@media (max-width: 720px) {
  .cl-version-head {
    flex-wrap: wrap;
  }

  .cl-version-head h2 {
    font-size: 1.5rem;
  }

  .cl-entry {
    padding: 14px;
    border-radius: 16px;
  }

  .cl-code {
    padding: 10px;
    border-radius: 10px;
  }

  .cl-code code {
    font-size: 0.82rem;
  }
}

/* ==========================================================================
   Syntax highlighting — zh-* classes (shared by rosetta + changelog)
   ========================================================================== */

.zh-kw {
  color: #7c3aed;
  font-weight: 600;
}

.zh-pa {
  color: #0891b2;
}

.zh-str {
  color: #16a34a;
}

.zh-num {
  color: #ea580c;
}

.zh-op {
  color: #64748b;
}

.zh-lit {
  color: #ea580c;
  font-weight: 600;
}

.zh-cm {
  color: #94a3b8;
  font-style: italic;
}