:root {
  color-scheme: light;
  --font-ui: "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  --font-song: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", "SimSun", serif;
  --font-code: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;

  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  --surface-root: oklch(96% 0.012 178);
  --surface-panel: oklch(99% 0.008 178);
  --surface-raised: oklch(100% 0.006 178);
  --ink: oklch(20% 0.026 178);
  --ink-soft: oklch(43% 0.028 178);
  --muted: oklch(62% 0.026 178);
  --line: oklch(86% 0.018 178);
  --line-strong: oklch(74% 0.032 178);
  --accent: oklch(45% 0.115 164);
  --accent-deep: oklch(31% 0.1 164);
  --accent-warm: oklch(62% 0.16 38);
  --success: oklch(48% 0.12 150);
  --danger: oklch(51% 0.17 25);
  --shadow-soft: 0 18px 46px oklch(26% 0.04 178 / 0.12);
  --radius-sm: 6px;
  --radius-md: 8px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  font-size: 16px;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    linear-gradient(90deg, oklch(93% 0.012 178) 1px, transparent 1px),
    linear-gradient(180deg, oklch(93% 0.012 178) 1px, transparent 1px),
    var(--surface-root);
  background-size: 28px 28px;
  color: var(--ink);
  font-family: var(--font-ui);
  font-kerning: normal;
  letter-spacing: 0;
}

button,
textarea {
  font: inherit;
}

button {
  border: 0;
}

.skip-link {
  position: fixed;
  top: var(--space-sm);
  left: var(--space-sm);
  z-index: 20;
  transform: translateY(-160%);
  border-radius: var(--radius-sm);
  background: var(--accent-deep);
  color: oklch(98% 0.01 164);
  padding: var(--space-xs) var(--space-sm);
  text-decoration: none;
  transition: transform 180ms var(--ease-out);
}

.skip-link:focus {
  transform: translateY(0);
}

.studio-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: var(--space-md);
  padding: max(var(--space-sm), env(safe-area-inset-top)) max(var(--space-sm), env(safe-area-inset-right)) max(var(--space-sm), env(safe-area-inset-bottom)) max(var(--space-sm), env(safe-area-inset-left));
}

.topbar {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  align-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in oklch, var(--surface-panel) 94%, oklch(90% 0.025 164));
  box-shadow: var(--shadow-soft);
  padding: var(--space-md);
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid oklch(58% 0.11 164);
  border-radius: var(--radius-sm);
  background: oklch(37% 0.105 164);
  color: oklch(96% 0.02 164);
  font-family: var(--font-song);
  font-size: 1.35rem;
  font-weight: 700;
}

.eyebrow,
.panel-kicker {
  margin: 0;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.2;
}

.brand-lockup h1,
.panel-head h2,
.rail-head h2,
.preview-head h2 {
  margin: 0;
  color: var(--ink);
  font-size: 1.25rem;
  line-height: 1.25;
}

.brand-lockup h1 {
  font-family: var(--font-song);
  font-size: 1.5rem;
}

.doc-meter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  color: var(--ink-soft);
  font-size: 0.875rem;
  line-height: 1.4;
}

.doc-meter span {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-raised);
  padding: var(--space-2xs) var(--space-sm);
}

.doc-meter strong {
  color: var(--accent-deep);
  font-variant-numeric: tabular-nums;
}

.top-actions,
.panel-actions,
.preview-head,
.panel-head,
.rail-head {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.top-actions {
  flex-wrap: wrap;
}

.panel-head,
.preview-head {
  justify-content: space-between;
  min-height: 3rem;
}

.rail-head {
  justify-content: space-between;
}

.button,
.icon-action,
.segment,
.preset-row {
  cursor: pointer;
  transition:
    transform 160ms var(--ease-out),
    border-color 160ms var(--ease-out),
    background-color 160ms var(--ease-out),
    color 160ms var(--ease-out);
}

.button {
  min-height: 2.75rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0 var(--space-md);
  font-weight: 700;
  white-space: nowrap;
}

.button-primary {
  background: var(--accent-deep);
  color: oklch(98% 0.01 164);
}

.button-secondary {
  border-color: var(--line);
  background: var(--surface-raised);
  color: var(--ink);
}

.icon-action {
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-raised);
  color: var(--ink-soft);
  font-size: 1.2rem;
}

.button:hover,
.icon-action:hover,
.segment:hover,
.preset-row:hover {
  transform: translateY(-1px);
}

.button:active,
.icon-action:active,
.segment:active,
.preset-row:active {
  transform: translateY(0);
}

.button:focus,
.icon-action:focus,
.segment:focus,
.preset-row:focus,
textarea:focus {
  outline: none;
}

.button:focus-visible,
.icon-action:focus-visible,
.segment:focus-visible,
.preset-row:focus-visible,
textarea:focus-visible {
  outline: 2px solid oklch(58% 0.14 164);
  outline-offset: 2px;
}

.workspace {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  min-height: 0;
}

.tool-panel,
.preview-panel {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-panel);
  box-shadow: var(--shadow-soft);
}

.editor-panel {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: var(--space-sm);
  min-height: 28rem;
  padding: var(--space-md);
}

textarea {
  width: 100%;
  min-height: 24rem;
  resize: none;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: oklch(99% 0.006 178);
  color: var(--ink);
  padding: var(--space-md);
  font-family: var(--font-code);
  font-size: 0.9375rem;
  line-height: 1.7;
  tab-size: 2;
}

textarea::placeholder {
  color: oklch(48% 0.026 178);
}

.style-rail {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in oklch, var(--surface-panel) 92%, oklch(92% 0.035 40));
  box-shadow: var(--shadow-soft);
  padding: var(--space-md);
}

.preset-list {
  display: grid;
  gap: var(--space-xs);
  margin-top: var(--space-md);
}

.preset-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-sm);
  align-items: center;
  width: 100%;
  min-height: 4.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-raised);
  color: var(--ink);
  padding: var(--space-sm);
  text-align: left;
}

.preset-row[aria-checked="true"] {
  border-color: oklch(54% 0.125 164);
  background: oklch(96% 0.026 164);
}

.preset-swatch {
  display: grid;
  grid-template-columns: repeat(2, 1rem);
  grid-template-rows: repeat(2, 1rem);
  gap: 0.1875rem;
}

.preset-swatch span {
  display: block;
  border-radius: 4px;
  border: 1px solid oklch(20% 0.02 178 / 0.12);
}

.preset-copy {
  display: grid;
  gap: 0.1875rem;
}

.preset-copy strong {
  font-size: 0.9375rem;
  line-height: 1.3;
}

.preset-copy small {
  color: var(--ink-soft);
  font-size: 0.75rem;
  line-height: 1.35;
}

.preset-check {
  display: grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: transparent;
  font-size: 0.875rem;
}

.preset-row[aria-checked="true"] .preset-check {
  border-color: var(--accent-deep);
  background: var(--accent-deep);
  color: oklch(98% 0.01 164);
}

.preview-panel {
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 36rem;
  overflow: hidden;
}

.preview-head {
  border-bottom: 1px solid var(--line);
  padding: var(--space-md);
}

.segmented {
  display: inline-grid;
  grid-template-columns: repeat(2, 1fr);
  min-height: 2.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-raised);
  padding: 0.1875rem;
}

.segment {
  min-width: 4rem;
  border-radius: 5px;
  background: transparent;
  color: var(--ink-soft);
  font-weight: 700;
}

.segment.is-active {
  background: var(--accent-deep);
  color: oklch(98% 0.01 164);
}

.preview-stage {
  display: grid;
  justify-items: center;
  align-items: start;
  overflow: auto;
  padding: var(--space-lg);
  background:
    linear-gradient(180deg, oklch(91% 0.014 178), oklch(95% 0.01 178));
}

.preview-stage.is-wide .wechat-article {
  width: min(44rem, 100%);
}

.wechat-article {
  width: min(23.4375rem, 100%);
  min-height: 38rem;
  background: var(--article-bg);
  color: var(--article-ink);
  border: 1px solid var(--article-line);
  border-radius: var(--radius-md);
  box-shadow: 0 24px 70px oklch(18% 0.04 178 / 0.16);
  padding: 2rem 1.25rem 2.5rem;
  font-family: var(--article-font);
  font-size: 1rem;
  line-height: 1.82;
  overflow-wrap: anywhere;
}

.wechat-article > *:first-child {
  margin-top: 0;
}

.wechat-article h1,
.wechat-article h2,
.wechat-article h3,
.wechat-article h4 {
  color: var(--article-heading);
  letter-spacing: 0;
}

.wechat-article h1 {
  margin: 0 0 1.5rem;
  font-family: var(--article-title-font);
  font-size: 1.7rem;
  line-height: 1.32;
  font-weight: 800;
}

.wechat-article h2 {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  margin: 2rem 0 0.75rem;
  border: 1px solid var(--article-accent);
  border-radius: var(--article-h2-radius);
  background: var(--article-h2-bg);
  padding: 0.25rem 0.7rem;
  font-size: 1.16rem;
  line-height: 1.45;
  font-weight: 800;
  white-space: normal;
}

.wechat-article h3 {
  margin: 1.6rem 0 0.5rem;
  font-size: 1.05rem;
  line-height: 1.45;
}

.wechat-article p {
  margin: 0.85rem 0;
}

.wechat-article strong {
  color: var(--article-strong);
  font-weight: 800;
}

.wechat-article em {
  color: var(--article-em);
  font-style: normal;
}

.wechat-article a {
  color: var(--article-link);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid color-mix(in oklch, var(--article-link) 62%, transparent);
}

.wechat-article blockquote {
  margin: 1.5rem 0;
  border: 1px solid var(--article-quote-line);
  border-radius: var(--radius-md);
  background: var(--article-quote-bg);
  padding: 1rem;
  color: var(--article-quote);
}

.wechat-article blockquote p {
  margin: 0.4rem 0;
}

.wechat-article ul,
.wechat-article ol {
  display: grid;
  gap: 0.45rem;
  margin: 1rem 0;
  padding-left: 1.45rem;
}

.wechat-article li {
  padding-left: 0.15rem;
}

.wechat-article .task-box {
  display: inline-grid;
  place-items: center;
  width: 1.05rem;
  height: 1.05rem;
  margin-right: 0.35rem;
  border: 1px solid var(--article-accent);
  border-radius: 4px;
  color: var(--article-accent);
  font-size: 0.75rem;
  vertical-align: -0.1rem;
}

.wechat-article code {
  border: 1px solid var(--article-code-line);
  border-radius: 5px;
  background: var(--article-code-bg);
  padding: 0.1rem 0.3rem;
  font-family: var(--font-code);
  font-size: 0.9em;
}

.wechat-article pre {
  overflow: auto;
  margin: 1.25rem 0;
  border: 1px solid var(--article-code-line);
  border-radius: var(--radius-md);
  background: var(--article-code-bg);
  padding: 1rem;
}

.wechat-article pre code {
  border: 0;
  background: transparent;
  padding: 0;
  white-space: pre;
}

.wechat-article table {
  width: 100%;
  margin: 1.25rem 0;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.wechat-article th,
.wechat-article td {
  border: 1px solid var(--article-line);
  padding: 0.55rem 0.65rem;
  text-align: left;
  vertical-align: top;
}

.wechat-article th {
  background: var(--article-table-head);
  color: var(--article-heading);
}

.wechat-article hr {
  height: 1px;
  border: 0;
  margin: 2rem auto;
  background: var(--article-divider);
}

.wechat-article img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin: 1.25rem auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--article-line);
}

.theme-forest {
  --article-bg: oklch(98% 0.014 158);
  --article-ink: oklch(25% 0.034 165);
  --article-heading: oklch(28% 0.1 158);
  --article-strong: oklch(31% 0.12 158);
  --article-em: oklch(46% 0.13 34);
  --article-link: oklch(40% 0.12 180);
  --article-line: oklch(84% 0.036 158);
  --article-accent: oklch(42% 0.13 158);
  --article-h2-bg: oklch(93% 0.05 158);
  --article-h2-radius: 7px;
  --article-quote-bg: oklch(95% 0.032 92);
  --article-quote-line: oklch(80% 0.055 92);
  --article-quote: oklch(34% 0.055 92);
  --article-code-bg: oklch(94% 0.018 180);
  --article-code-line: oklch(80% 0.028 180);
  --article-table-head: oklch(93% 0.042 158);
  --article-divider: oklch(70% 0.08 158);
  --article-font: var(--font-song);
  --article-title-font: var(--font-song);
}

.theme-leadtype {
  --article-bg: oklch(98% 0.008 255);
  --article-ink: oklch(23% 0.027 255);
  --article-heading: oklch(24% 0.045 255);
  --article-strong: oklch(37% 0.13 22);
  --article-em: oklch(43% 0.1 275);
  --article-link: oklch(39% 0.12 255);
  --article-line: oklch(83% 0.02 255);
  --article-accent: oklch(45% 0.14 22);
  --article-h2-bg: oklch(96% 0.018 22);
  --article-h2-radius: 0;
  --article-quote-bg: oklch(95% 0.012 255);
  --article-quote-line: oklch(73% 0.036 255);
  --article-quote: oklch(36% 0.03 255);
  --article-code-bg: oklch(94% 0.012 255);
  --article-code-line: oklch(79% 0.02 255);
  --article-table-head: oklch(94% 0.016 255);
  --article-divider: oklch(55% 0.12 22);
  --article-font: var(--font-song);
  --article-title-font: var(--font-song);
}

.theme-brief {
  --article-bg: oklch(98% 0.008 205);
  --article-ink: oklch(22% 0.03 205);
  --article-heading: oklch(26% 0.075 205);
  --article-strong: oklch(34% 0.11 192);
  --article-em: oklch(42% 0.13 88);
  --article-link: oklch(39% 0.12 192);
  --article-line: oklch(82% 0.025 205);
  --article-accent: oklch(44% 0.12 192);
  --article-h2-bg: oklch(93% 0.04 192);
  --article-h2-radius: 999px;
  --article-quote-bg: oklch(95% 0.018 205);
  --article-quote-line: oklch(78% 0.045 205);
  --article-quote: oklch(34% 0.04 205);
  --article-code-bg: oklch(93% 0.024 205);
  --article-code-line: oklch(78% 0.036 205);
  --article-table-head: oklch(92% 0.036 192);
  --article-divider: oklch(64% 0.1 192);
  --article-font: var(--font-ui);
  --article-title-font: var(--font-ui);
}

.theme-night {
  --article-bg: oklch(18% 0.018 245);
  --article-ink: oklch(88% 0.018 245);
  --article-heading: oklch(95% 0.02 80);
  --article-strong: oklch(82% 0.13 86);
  --article-em: oklch(75% 0.12 180);
  --article-link: oklch(78% 0.11 180);
  --article-line: oklch(34% 0.025 245);
  --article-accent: oklch(77% 0.12 86);
  --article-h2-bg: oklch(24% 0.026 245);
  --article-h2-radius: 7px;
  --article-quote-bg: oklch(23% 0.025 245);
  --article-quote-line: oklch(47% 0.06 86);
  --article-quote: oklch(84% 0.035 86);
  --article-code-bg: oklch(15% 0.018 245);
  --article-code-line: oklch(38% 0.028 245);
  --article-table-head: oklch(24% 0.026 245);
  --article-divider: oklch(69% 0.1 86);
  --article-font: var(--font-ui);
  --article-title-font: var(--font-song);
}

.theme-rose {
  --article-bg: oklch(98% 0.016 8);
  --article-ink: oklch(24% 0.033 8);
  --article-heading: oklch(34% 0.11 8);
  --article-strong: oklch(38% 0.14 8);
  --article-em: oklch(40% 0.11 172);
  --article-link: oklch(38% 0.12 172);
  --article-line: oklch(84% 0.032 8);
  --article-accent: oklch(50% 0.15 8);
  --article-h2-bg: oklch(94% 0.038 8);
  --article-h2-radius: 7px;
  --article-quote-bg: oklch(95% 0.026 35);
  --article-quote-line: oklch(79% 0.05 35);
  --article-quote: oklch(35% 0.055 35);
  --article-code-bg: oklch(94% 0.018 172);
  --article-code-line: oklch(78% 0.032 172);
  --article-table-head: oklch(94% 0.036 8);
  --article-divider: oklch(64% 0.13 8);
  --article-font: var(--font-song);
  --article-title-font: var(--font-song);
}

.toast {
  position: fixed;
  right: var(--space-md);
  bottom: var(--space-md);
  z-index: 30;
  max-width: min(22rem, calc(100vw - 2rem));
  transform: translateY(130%);
  border: 1px solid oklch(58% 0.1 150);
  border-radius: var(--radius-md);
  background: oklch(96% 0.04 150);
  color: oklch(28% 0.08 150);
  box-shadow: var(--shadow-soft);
  padding: var(--space-sm) var(--space-md);
  font-weight: 700;
  opacity: 0;
  transition:
    transform 260ms var(--ease-out),
    opacity 260ms var(--ease-out);
}

.toast.is-visible {
  transform: translateY(0);
  opacity: 1;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@media (min-width: 48rem) {
  .topbar {
    grid-template-columns: minmax(12rem, 1fr) auto;
  }

  .top-actions {
    grid-column: 1 / -1;
  }

  .workspace {
    grid-template-columns: minmax(20rem, 1fr) minmax(17rem, 0.7fr);
  }

  .preview-panel {
    grid-column: 1 / -1;
  }
}

@media (min-width: 72rem) {
  .studio-shell {
    padding: var(--space-md);
  }

  .topbar {
    grid-template-columns: minmax(14rem, 1fr) auto auto;
  }

  .top-actions {
    grid-column: auto;
    justify-content: end;
  }

  .workspace {
    grid-template-columns: minmax(22rem, 0.95fr) minmax(17rem, 0.58fr) minmax(26rem, 1.22fr);
    height: calc(100vh - 7.25rem);
  }

  .editor-panel,
  .style-rail,
  .preview-panel {
    min-height: 0;
  }

  textarea,
  .preview-stage,
  .preset-list {
    min-height: 0;
  }

  .style-rail {
    overflow: auto;
  }

  .preview-panel {
    grid-column: auto;
  }
}

@media (pointer: coarse) {
  .button,
  .icon-action,
  .segment,
  .preset-row {
    min-height: 2.875rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}