:root {
  --bg: #f3f6f6;
  --bg-soft: #eaf0f0;
  --paper: #ffffff;
  --ink: #1e292f;
  --ink-2: #465760;
  --ink-3: #5c6b73;
  --line: #ccd8da;
  --line-soft: #e1e8e9;
  --accent: #23636a;
  --accent-deep: #174d53;
  --cinnabar: #a53e35;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  --serif: "Songti SC", "STSong", "Noto Serif SC", Georgia, serif;
  --mono: "SFMono-Regular", "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { min-width: 320px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background:
    linear-gradient(rgba(35, 99, 106, .026) 1px, transparent 1px),
    linear-gradient(90deg, rgba(35, 99, 106, .026) 1px, transparent 1px),
    var(--bg);
  background-size: 24px 24px;
  color: var(--ink);
  font: 15px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; color: inherit; }
button, select, input[type="color"] { min-height: 40px; }
button {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--paper);
  padding: 7px 12px;
  cursor: pointer;
}
button:hover { border-color: var(--accent); color: var(--accent); }
button:disabled { cursor: progress; opacity: .55; }
button.primary { color: #fff; background: var(--accent); border-color: var(--accent); font-weight: 650; }
button.primary:hover { background: var(--accent-deep); border-color: var(--accent-deep); color: #fff; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
::selection { background: #d8e9e9; }
.visually-hidden {
  position: fixed !important;
  left: -10000px !important;
  width: 1px !important;
  height: 1px !important;
  opacity: 0 !important;
}
.skip-link { position: fixed; left: -9999px; top: 10px; z-index: 100; }
.skip-link:focus { left: 12px; background: var(--paper); padding: 8px 14px; border: 1px solid var(--line); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line-soft);
  background: rgba(243, 246, 246, .94);
  backdrop-filter: blur(14px) saturate(1.2);
}
.header-inner {
  max-width: 1480px;
  height: 56px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 11px; min-width: 0; }
.brand img { width: 33px; height: 28px; color: var(--accent); }
.brand span { display: flex; flex-direction: column; min-width: 0; line-height: 1.15; }
.brand b { font-family: var(--serif); font-size: 19px; letter-spacing: .07em; white-space: nowrap; }
.brand i { color: var(--ink-3); font-size: 11px; font-style: normal; }
.site-header nav { display: flex; min-width: 0; align-items: center; gap: 2px; }
.site-header nav a { position: relative; padding: 8px 10px; color: var(--ink-2); white-space: nowrap; }
.site-header nav a.active { color: var(--accent); font-weight: 650; }
.site-header nav a.active::after {
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 3px;
  height: 2px;
  background: var(--accent);
  content: "";
}

.studio-shell { max-width: 1480px; margin: 0 auto; padding: 12px 24px 34px; }
.studio-intro {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 44px;
  margin-bottom: 8px;
  padding: 0 2px;
}
.studio-title-lockup { display: flex; align-items: baseline; gap: 11px; white-space: nowrap; }
.studio-intro .kicker { margin: 0; color: var(--cinnabar); font-size: 12px; font-weight: 650; letter-spacing: .08em; }
.studio-intro h1 {
  margin: 0;
  font: 650 22px/1.25 var(--serif);
  letter-spacing: .03em;
}
.privacy-note { margin: 0; color: var(--ink-2); font-size: 12px; }
.privacy-note b { color: var(--ink); }

.document-bar, .format-ribbon, .status-rail, .privacy-details {
  background: rgba(255, 255, 255, .94);
  border: 1px solid var(--line);
}
.document-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 7px 10px;
  border-radius: 8px 8px 0 0;
  border-bottom: 0;
}
.document-picker { display: grid; grid-template-columns: auto minmax(180px, 1fr); align-items: center; gap: 8px; min-width: 300px; color: var(--ink-3); font-size: 11px; }
.document-picker select { min-height: 38px; border: 0; border-bottom: 1px solid var(--line); background: transparent; font-size: 14px; }
.document-actions { display: flex; flex: 1; justify-content: flex-end; gap: 7px; }
.document-actions button { margin: 0; }
.more-actions { position: relative; }
.more-actions summary {
  display: flex;
  min-height: 40px;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--paper);
  cursor: pointer;
  list-style: none;
}
.more-actions summary::-webkit-details-marker, .format-ribbon > summary::-webkit-details-marker { display: none; }
.more-actions summary::after { color: var(--ink-3); content: "⌄"; }
.more-actions[open] summary { border-color: var(--accent); color: var(--accent); }
.more-menu {
  position: absolute;
  top: calc(100% + 7px);
  right: 0;
  z-index: 45;
  display: grid;
  width: 190px;
  gap: 5px;
  padding: 7px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--paper);
  box-shadow: 0 16px 36px -22px rgba(20, 34, 40, .6);
}
.more-menu button { width: 100%; text-align: left; }
.more-menu .danger-action { color: #8c302a; }
.more-actions:not([open]) > .more-menu { display: none; }

.format-ribbon {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  min-height: 50px;
  padding: 5px 10px;
  border-radius: 0 0 8px 8px;
}
.format-ribbon > summary { display: grid; min-height: 38px; align-content: center; padding: 0 4px; cursor: pointer; list-style: none; white-space: nowrap; }
.format-ribbon > summary span { font-size: 12px; font-weight: 650; }
.format-ribbon > summary small { color: var(--ink-3); font-size: 10px; font-weight: 400; }
.format-ribbon > summary::after { display: none; }
.format-body { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 10px; min-width: 0; }
.format-ribbon:not([open]) > .format-body { display: none; }
.template-strip { display: flex; gap: 5px; overflow-x: auto; padding: 2px 1px; scrollbar-width: thin; }
.template-chip {
  flex: 0 0 auto;
  display: grid;
  grid-template-columns: 11px auto;
  align-items: center;
  gap: 6px;
  min-height: 38px;
  padding: 5px 7px;
  color: var(--ink-2);
  font-size: 12px;
}
.template-chip i {
  width: 11px;
  height: 23px;
  border: 1px solid #0001;
  border-radius: 2px;
  background: linear-gradient(#fff 0 42%, var(--swatch) 42% 58%, #fff 58%);
}
.template-chip[aria-pressed="true"] {
  border-color: var(--swatch);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--swatch) 13%, transparent);
  color: var(--ink);
}
.format-controls { display: flex; align-items: end; gap: 7px; }
.format-controls label { display: flex; align-items: center; gap: 4px; color: var(--ink-3); font-size: 11px; white-space: nowrap; }
.format-controls select { min-width: 76px; border: 1px solid var(--line); border-radius: 5px; background: var(--paper); padding: 5px 24px 5px 7px; }
.format-controls input[type="color"] { width: 40px; border: 1px solid var(--line); border-radius: 5px; background: var(--paper); padding: 4px; }
.format-controls button { min-height: 40px; padding-inline: 9px; }

.mobile-view-switch { display: none; }
.editor-grid {
  display: grid;
  grid-template-columns: minmax(340px, .82fr) minmax(520px, 1.18fr);
  gap: 14px;
  min-height: 640px;
  height: calc(100vh - 244px);
  margin-top: 10px;
}
.editor-pane {
  min-width: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 15px 36px -34px rgba(30, 41, 47, .7);
}
.pane-heading {
  flex: 0 0 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 13px;
  border-bottom: 1px solid var(--line-soft);
  background: #fbfcfc;
}
.pane-heading > div:first-child { display: flex; align-items: baseline; gap: 10px; min-width: 0; }
.pane-heading b { font-size: 14px; }
.pane-heading span { overflow: hidden; color: var(--ink-3); font-size: 11px; text-overflow: ellipsis; white-space: nowrap; }
.key-hint { flex: none; }
kbd { padding: 1px 4px; border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 3px; background: #fff; font: 10px var(--mono); }
.preview-actions { display: flex; align-items: center; gap: 6px; }
.preview-actions button { min-height: 34px; padding: 5px 9px; font-size: 12px; }
.markdown-toolbar {
  position: relative;
  z-index: 6;
  display: flex;
  flex: 0 0 47px;
  min-width: 0;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  border-bottom: 1px solid var(--line-soft);
  background: #f7f9f9;
}
.toolbar-primary { display: flex; min-width: 0; flex: 1; gap: 4px; overflow-x: auto; scrollbar-width: thin; }
.markdown-toolbar button, .md-more summary {
  display: inline-flex;
  min-height: 36px;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--paper);
  color: var(--ink-2);
  font-size: 12px;
  line-height: 1;
}
.markdown-toolbar button:hover, .md-more summary:hover { border-color: var(--accent); color: var(--accent); }
.markdown-toolbar code { padding: 0; background: none; color: inherit; font: 12px var(--mono); }
.md-more { position: relative; flex: none; }
.md-more summary { gap: 5px; cursor: pointer; list-style: none; }
.md-more summary::-webkit-details-marker { display: none; }
.md-more summary::after { content: "⌄"; }
.md-more[open] summary { border-color: var(--accent); color: var(--accent); }
.md-more-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr 1fr;
  width: 220px;
  gap: 5px;
  padding: 7px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--paper);
  box-shadow: 0 16px 36px -22px rgba(20, 34, 40, .6);
}
.md-more:not([open]) > .md-more-menu { display: none; }
.md-more-menu button { width: 100%; min-height: 40px; justify-content: flex-start; }
#markdown-source {
  flex: 1;
  width: 100%;
  min-height: 0;
  resize: none;
  border: 0;
  outline: 0;
  padding: 24px 26px 80px;
  background:
    linear-gradient(90deg, transparent 0 54px, rgba(165, 62, 53, .14) 54px 55px, transparent 55px),
    repeating-linear-gradient(transparent 0 28px, rgba(35, 99, 106, .045) 28px 29px),
    #fbfcfc;
  color: #26343b;
  font: 13.5px/1.85 var(--mono);
  tab-size: 2;
}
.preview-scroll { flex: 1; min-height: 0; overflow-x: hidden; overflow-y: auto; padding: 22px; background: #e7eded; }

.wechat-paper {
  --md-accent: #a53e35;
  --md-soft: rgba(165, 62, 53, .08);
  --md-font-size: 17px;
  --md-line-height: 1.92;
  --md-paragraph-spacing: .65em;
  --md-block-spacing: 1em;
  --md-list-item-spacing: .23em;
  --md-body-font: "Songti SC", "STSong", "Noto Serif CJK SC", Cambria, Georgia, serif;
  --md-heading-font: Optima, "PingFang SC", "Hiragino Sans GB", sans-serif;
  width: min(100%, 720px);
  min-height: 100%;
  margin: 0 auto;
  padding: 44px 46px 58px;
  background: #fff;
  box-shadow: 0 3px 18px rgba(23, 33, 43, .08);
  color: #3b3b3b;
  font-family: var(--md-body-font);
  font-size: var(--md-font-size);
  line-height: var(--md-line-height);
  letter-spacing: .015em;
  overflow-wrap: anywhere;
}
.wechat-paper:empty::before { content: "在左侧写下 Markdown，排版结果会出现在这里。"; display: block; padding-top: 20vh; color: #888; text-align: center; }
.wechat-paper h1, .wechat-paper h2, .wechat-paper h3, .wechat-paper h4, .wechat-paper h5, .wechat-paper h6 { font-family: var(--md-heading-font); line-height: 1.45; color: #272727; }
.wechat-paper h1 { margin: .25em 0 calc(var(--md-paragraph-spacing) + .6em); font-size: 27px; font-weight: 650; letter-spacing: .04em; text-align: center; }
.wechat-paper h2 { margin: calc(var(--md-paragraph-spacing) + 1.15em) 0 calc(var(--md-paragraph-spacing) + .15em); padding: .08em 0 .08em .72em; border-left: 4px solid var(--md-accent); font-size: 22px; font-weight: 650; }
.wechat-paper h3 { margin: calc(var(--md-paragraph-spacing) + .9em) 0 var(--md-paragraph-spacing); color: var(--md-accent); font-size: 18px; font-weight: 650; }
.wechat-paper h4 { margin: calc(var(--md-paragraph-spacing) + .7em) 0 var(--md-paragraph-spacing); font-size: 16.5px; font-weight: 650; }
.wechat-paper h5 { margin: calc(var(--md-paragraph-spacing) + .55em) 0 var(--md-paragraph-spacing); font-size: 15.5px; font-weight: 650; }
.wechat-paper h6 { margin: calc(var(--md-paragraph-spacing) + .45em) 0 var(--md-paragraph-spacing); color: #666; font-size: 14.5px; font-weight: 600; }
.wechat-paper p { margin: var(--md-paragraph-spacing) 0; }
.wechat-paper ul, .wechat-paper ol { margin: var(--md-paragraph-spacing) 0; padding-left: 1.65em; }
.wechat-paper li { margin: var(--md-list-item-spacing) 0; }
.wechat-paper strong { color: #252525; font-weight: 650; }
.wechat-paper .table-scroll { max-width: 100%; margin: var(--md-block-spacing) 0; overflow-x: auto; overscroll-behavior-inline: contain; }
.wechat-paper table { width: 100%; min-width: 520px; margin: 0; border-collapse: collapse; font-size: 15px; line-height: 1.65; }
.wechat-paper th, .wechat-paper td { border: 1px solid #dedbd7; padding: 8px 10px; }
.wechat-paper th { background: #f7f5f2; color: #2d2d2d; font-weight: 650; }
.wechat-paper pre { overflow: auto; padding: 14px 16px; border: 1px solid #e5e1dc; border-radius: 2px; background: #f7f6f4; line-height: 1.65; }
.wechat-paper code { padding: .12em .32em; border-radius: 2px; background: #f5f2ef; color: #8e3f39; font-family: var(--mono); }
.wechat-paper pre code { padding: 0; background: transparent; color: #3d3d3d; }
.wechat-paper blockquote { margin: var(--md-block-spacing) 0; padding: .25em 1.05em; border-left: 3px solid var(--md-accent); background: var(--md-soft); color: #666; }
.wechat-paper img { display: block; max-width: 100%; height: auto; margin: var(--md-block-spacing) auto; }
.wechat-paper a { color: var(--md-accent); border-bottom: 1px solid currentColor; text-decoration: none; }
.wechat-paper .math-display { display: block; min-height: 1.5em; margin: var(--md-block-spacing) 0; overflow-x: auto; color: #292929; line-height: normal; text-align: center; }
.wechat-paper .math-display > .katex-display { display: block; margin: 0; padding: .35em 0; }
.wechat-paper .math-inline { white-space: nowrap; }
.wechat-paper .math-inline > .katex { font-size: 1em; }
.wechat-paper .math-inline.math-script > .katex { font-size: .98em; }
.wechat-paper .math-inline.math-tall > .katex { font-size: .96em; }
.wechat-paper .math-error { padding: .1em .25em; background: #fff1ef; color: #9b2e26; font-family: var(--mono); }
.wechat-paper .image-error { min-height: 64px; padding: 14px; border: 1px dashed #b9c6c8; background: #f7f9f9; color: #65747b; }
.wechat-paper .footnotes { margin-top: 2.4em; color: #666; font-size: .82em; line-height: 1.7; }
.wechat-paper .footnotes hr { margin-bottom: 1em; border: 0; border-top: 1px solid #dedbd7; }
.wechat-paper .footnotes ol { padding-left: 1.5em; }
.wechat-paper .footnote-ref { margin-left: .08em; font-family: var(--mono); font-size: .75em; vertical-align: super; }
.wechat-paper .footnote-backref { margin-left: .35em; border: 0; }
.wechat-paper .table-scroll:focus-visible, .wechat-paper pre:focus-visible, .wechat-paper .math-display:focus-visible { outline: 3px solid var(--md-accent); outline-offset: 2px; }

.wechat-paper[data-template="ink"] { --md-soft: #f6f6f4; color: #292929; letter-spacing: .01em; }
.wechat-paper[data-template="ink"] h2 { padding: .18em 0; border: 0; border-bottom: 1px solid #292929; letter-spacing: .08em; }
.wechat-paper[data-template="ink"] h3 { padding-left: .62em; border-left: 2px solid #292929; color: #292929; }
.wechat-paper[data-template="teal"] { --md-soft: #eff8f6; }
.wechat-paper[data-template="teal"] h2 { padding: .34em .72em; border: 0; border-radius: 3px; background: var(--md-soft); color: var(--md-accent); }
.wechat-paper[data-template="teal"] h3 { display: flex; align-items: center; gap: .5em; }
.wechat-paper[data-template="teal"] h3::before { width: 1.1em; height: 2px; background: var(--md-accent); content: ""; }
.wechat-paper[data-template="indigo"] { --md-soft: #f3f2fa; }
.wechat-paper[data-template="indigo"] h2 { padding: .18em 0 .32em; border: 0; border-bottom: 2px solid var(--md-accent); color: var(--md-accent); text-align: center; }
.wechat-paper[data-template="indigo"] h3 { padding-left: .75em; border-left: 3px double var(--md-accent); }
.wechat-paper[data-template="lemon"] { --md-soft: #fff9dd; }
.wechat-paper[data-template="lemon"] h2 { display: table; padding: .12em .42em; border: 0; background: linear-gradient(transparent 48%, var(--md-soft) 48%); color: #292929; }
.wechat-paper[data-template="lemon"] h3 { display: inline-block; padding: .06em .35em; background: var(--md-soft); color: #4a421c; }
.wechat-paper[data-template="blueprint"] { --md-soft: #eef5fb; }
.wechat-paper[data-template="blueprint"] h2 { padding: .36em .3em; border: 0; border-top: 1px solid var(--md-accent); border-bottom: 1px solid var(--md-accent); color: var(--md-accent); letter-spacing: .08em; }
.wechat-paper[data-template="blueprint"] h3 { padding-bottom: .18em; border-bottom: 1px dashed color-mix(in srgb, var(--md-accent) 58%, white); }
.wechat-paper[data-template="parchment"] { --md-soft: #f7f1e8; color: #40382f; }
.wechat-paper[data-template="parchment"] h2 { padding: .25em .6em; border: 0; border-top: 3px double var(--md-accent); border-bottom: 1px solid var(--md-accent); color: #5d452f; }
.wechat-paper[data-template="rose"] { --md-soft: #fbf0f4; }
.wechat-paper[data-template="rose"] h2 { padding: .3em .8em; border: 0; border-radius: 99px; background: var(--md-soft); color: var(--md-accent); text-align: center; }
.wechat-paper[data-template="forest"] { --md-soft: #eef5ef; }
.wechat-paper[data-template="forest"] h2 { position: relative; padding: .18em 0 .18em 1.1em; border: 0; color: var(--md-accent); }
.wechat-paper[data-template="forest"] h2::before { position: absolute; top: .55em; left: 0; width: .55em; height: .55em; border: 2px solid var(--md-accent); border-radius: 50%; content: ""; }
.wechat-paper[data-template="coral"] { --md-soft: #fff1ed; }
.wechat-paper[data-template="coral"] h2 { padding: .36em .72em; border: 0; border-left: 5px solid var(--md-accent); background: linear-gradient(90deg, var(--md-soft), transparent 72%); }
.wechat-paper[data-template="slate"] { --md-soft: #f0f3f6; }
.wechat-paper[data-template="slate"] h2 { padding: .12em 0 .38em; border: 0; border-bottom: 3px solid var(--md-soft); color: var(--md-accent); }
.wechat-paper[data-template="slate"] h2::after { display: block; width: 3.2em; margin-top: .34em; border-bottom: 3px solid var(--md-accent); content: ""; }
.wechat-paper[data-template="minimal"] { --md-soft: #f7f7f7; letter-spacing: 0; }
.wechat-paper[data-template="minimal"] h2 { padding: 0; border: 0; color: #222; font-size: 21px; letter-spacing: .12em; }
.wechat-paper[data-template="minimal"] h3 { padding: 0; border: 0; color: #555; font-size: 17px; }

.status-rail {
  display: grid;
  grid-template-columns: minmax(250px, auto) 1fr;
  gap: 22px;
  margin-top: 12px;
  padding: 10px 13px;
  border-radius: 7px;
  color: var(--ink-3);
  font-size: 12px;
}
.status-rail > div { display: flex; align-items: center; min-width: 0; color: var(--ink-2); }
.status-rail p { margin: 0; text-align: right; }
.save-light { width: 8px; height: 8px; margin-right: 8px; border-radius: 50%; background: #76858b; box-shadow: 0 0 0 3px #76858b20; }
.save-light[data-state="pending"], .save-light[data-state="saving"] { background: #a36510; box-shadow: 0 0 0 3px #a3651024; }
.save-light[data-state="saved"] { background: #177148; box-shadow: 0 0 0 3px #17714822; }
.save-light[data-state="error"] { background: #a33129; box-shadow: 0 0 0 3px #a3312922; }
.privacy-details { margin-top: 12px; border-radius: 7px; color: var(--ink-2); }
.privacy-details summary { padding: 11px 13px; cursor: pointer; font-weight: 650; }
.privacy-details > div { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; padding: 0 13px 13px; }
.privacy-details p { margin: 0; font-size: 12px; }

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 80;
  max-width: min(430px, calc(100vw - 40px));
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 16px 42px -24px rgba(0, 0, 0, .5);
  color: var(--ink-2);
}

@media (max-width: 1180px) {
  .format-body { grid-template-columns: minmax(0, 1fr); }
  .format-controls { justify-content: flex-end; padding-top: 5px; border-top: 1px solid var(--line-soft); }
  .editor-grid { height: calc(100vh - 294px); }
}

@media (max-width: 840px) {
  button, select, input[type="color"] { min-height: 44px; }
  .header-inner { gap: 14px; }
  .site-header nav { gap: 0; }
  .site-header nav a { padding-inline: 7px; font-size: 13px; }
  .studio-shell { padding: 9px 12px 28px; }
  .studio-intro { display: none; }
  .document-bar { align-items: stretch; flex-direction: column; gap: 10px; }
  .document-picker { grid-template-columns: auto minmax(0, 1fr); width: 100%; min-width: 0; }
  .document-actions { display: grid; grid-template-columns: 1.3fr 1fr .72fr; }
  .document-actions button { padding-inline: 6px; font-size: 12px; }
  .more-actions summary { min-height: 44px; justify-content: center; padding-inline: 6px; font-size: 12px; }
  .more-menu { right: 0; width: min(220px, calc(100vw - 24px)); }
  .format-ribbon { display: block; min-height: 44px; padding: 0 10px; }
  .format-ribbon > summary { position: relative; min-height: 44px; padding-right: 22px; }
  .format-ribbon > summary::after { position: absolute; top: 11px; right: 2px; display: block; color: var(--ink-3); content: "＋"; font-size: 18px; }
  .format-ribbon[open] > summary::after { content: "−"; }
  .format-body { display: block; padding: 4px 0 9px; border-top: 1px solid var(--line-soft); }
  .format-controls { justify-content: flex-start; flex-wrap: wrap; overflow-x: visible; margin-top: 7px; padding-top: 8px; }
  .format-controls label { flex: 0 0 auto; }
  .format-controls button { flex: 0 0 auto; min-height: 44px; white-space: nowrap; }
  .mobile-view-switch {
    display: grid;
    grid-template-columns: 1fr 1fr;
    margin-top: 12px;
    padding: 3px;
    border: 1px solid var(--line);
    border-radius: 7px;
    background: var(--bg-soft);
  }
  .mobile-view-switch button { min-height: 44px; border: 0; background: transparent; }
  .mobile-view-switch button[aria-pressed="true"] { background: #fff; color: var(--accent); box-shadow: 0 1px 4px rgba(30, 41, 47, .12); }
  .editor-grid { display: block; height: auto; min-height: 0; margin-top: 8px; }
  .editor-pane { height: max(520px, calc(100vh - 292px)); min-height: 0; }
  .editor-grid[data-mobile-view="edit"] .preview-pane { display: none; }
  .editor-grid[data-mobile-view="preview"] .source-pane { display: none; }
  .template-chip, .preview-actions button { min-height: 44px; font-size: 11px; }
  .markdown-toolbar { flex-basis: 55px; padding: 5px 6px; }
  .markdown-toolbar button, .md-more summary { min-width: 44px; min-height: 44px; padding-inline: 10px; }
  .md-more-menu { width: min(240px, calc(100vw - 36px)); }
  .md-more-menu button { min-height: 44px; }
  .preview-scroll { padding: 12px; }
  .wechat-paper { padding: 32px 24px 48px; box-shadow: none; }
  .status-rail { grid-template-columns: 1fr; gap: 5px; }
  .status-rail p { text-align: left; }
  .privacy-details > div { grid-template-columns: 1fr; }
}

@media (max-width: 500px) {
  .header-inner { height: 56px; padding-inline: 12px; }
  .brand { flex: none; gap: 7px; }
  .brand img { width: 25px; height: 21px; }
  .brand span { display: none; }
  .site-header nav { flex: 1; justify-content: flex-end; }
  .site-header nav a { padding-inline: 4px; font-size: 11px; }
  .site-header nav a.active::after { left: 4px; right: 4px; }
  .document-bar { gap: 7px; padding: 7px; }
  .document-actions { grid-template-columns: 1.25fr 1fr .72fr; }
  .pane-heading { align-items: flex-start; height: auto; min-height: 58px; padding-block: 7px; }
  .preview-actions { align-items: stretch; }
  .preview-actions button { min-height: 44px; padding-inline: 7px; }
  .preview-actions #download-html { display: none; }
  #markdown-source { padding: 20px 16px 70px; background: repeating-linear-gradient(transparent 0 28px, rgba(35, 99, 106, .045) 28px 29px), #fbfcfc; }
  .wechat-paper { padding: 28px 18px 44px; font-size: min(var(--md-font-size), 17px); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

@media print {
  .site-header, .studio-intro, .document-bar, .format-ribbon, .mobile-view-switch, .source-pane, .pane-heading, .status-rail, .privacy-details { display: none !important; }
  body, .preview-scroll { background: #fff; }
  .studio-shell { max-width: none; padding: 0; }
  .editor-grid, .editor-pane { display: block; height: auto; min-height: 0; border: 0; box-shadow: none; }
  .wechat-paper { width: auto; min-height: 0; box-shadow: none; }
}