@font-face { font-family: PulseChirp; src: url('/fonts/chirp-regular.woff2') format('woff2'); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: PulseChirp; src: url('/fonts/chirp-medium.woff2') format('woff2'); font-weight: 500; font-style: normal; font-display: swap; }
@font-face { font-family: PulseChirp; src: url('/fonts/chirp-bold.woff2') format('woff2'); font-weight: 700; font-style: normal; font-display: swap; }
@font-face { font-family: PulseChirp; src: url('/fonts/chirp-light.woff2') format('woff2'); font-weight: 300; font-style: normal; font-display: swap; }
@font-face { font-family: PulseChirp; src: url('/fonts/chirp-heavy.woff2') format('woff2'); font-weight: 800; font-style: normal; font-display: swap; }

/* Appearance is rooted on html so drawers, media and Radix portals agree.
   The Twitter measurements were observed on X; Pulse keeps its own identity. */
html[data-design] {
  --appearance-accent: #1d9bf0;
  --appearance-accent-ink: #087abb;
  --appearance-on-accent: #fff;
  --appearance-font: PulseChirp, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --appearance-shadow: 0 8px 36px rgb(15 20 25 / 9%);
  --appearance-panel-shadow: 0 0 15px rgb(101 119 134 / 20%), 0 0 3px 1px rgb(101 119 134 / 15%);
  --appearance-hover: color-mix(in srgb, var(--ink) 3%, var(--white));
  --appearance-accent-soft: color-mix(in srgb, var(--appearance-accent) 10%, var(--white));
  --appearance-gutter: 16px;
}
html[data-accent="yellow"] { --appearance-accent: #ffd400; --appearance-accent-ink: #8a6200; --appearance-on-accent: #0f1419; }
html[data-accent="pink"] { --appearance-accent: #f91880; --appearance-accent-ink: #c01060; }
html[data-accent="purple"] { --appearance-accent: #7856ff; --appearance-accent-ink: #6841e4; }
html[data-accent="orange"] { --appearance-accent: #ff7a00; --appearance-accent-ink: #ad4e00; --appearance-on-accent: #0f1419; }
html[data-accent="green"] { --appearance-accent: #00ba7c; --appearance-accent-ink: #007b52; --appearance-on-accent: #0f1419; }

html[data-theme="light"] {
  color-scheme: light;
  --ink: #0f1419; --muted: #536471; --line: #eff3f4; --hairline: #eff3f4;
  --canvas: #fff; --white: #fff; --background: #fff; --foreground: #0f1419;
  --surface: #fff; --surface-raised: #fff; --surface-soft: #f7f9f9; --surface-muted: #f7f9f9;
  --thread-line: #cfd9de; --border: #cfd9de; --input: #cfd9de;
  --card: #fff; --card-foreground: #0f1419; --muted-foreground: #536471;
  --active-pill: #0f1419; --active-pill-text: #fff;
  --learning-vocabulary-ink: #087abb; --learning-grammar-ink: #6841e4; --learning-fast-ink: #946000;
}
html[data-theme="dim"] {
  color-scheme: dark;
  --ink: #f7f9f9; --muted: #8b98a5; --line: #38444d; --hairline: #38444d;
  --canvas: #15202b; --white: #15202b; --background: #15202b; --foreground: #f7f9f9;
  --surface: #15202b; --surface-raised: #192734; --surface-soft: #1e2732; --surface-muted: #192734;
  --thread-line: #536471; --border: #536471; --input: #536471;
  --card: #15202b; --card-foreground: #f7f9f9; --muted-foreground: #8b98a5;
  --active-pill: #f7f9f9; --active-pill-text: #15202b;
  --appearance-shadow: 0 8px 36px rgb(0 0 0 / 22%);
  --appearance-panel-shadow: 0 0 15px rgb(136 153 166 / 20%), 0 0 3px 1px rgb(136 153 166 / 15%);
}
html[data-theme="dark"] {
  color-scheme: dark;
  --ink: #e7e9ea; --muted: #71767b; --line: #2f3336; --hairline: #2f3336;
  --canvas: #000; --white: #000; --background: #000; --foreground: #e7e9ea;
  --surface: #000; --surface-raised: #000; --surface-soft: #16181c; --surface-muted: #16181c;
  --thread-line: #333639; --border: #536471; --input: #536471;
  --card: #000; --card-foreground: #e7e9ea; --muted-foreground: #71767b;
  --active-pill: #eff3f4; --active-pill-text: #0f1419;
  --appearance-shadow: 0 8px 36px rgb(0 0 0 / 40%);
  --appearance-panel-shadow: 0 0 15px rgb(255 255 255 / 10%), 0 0 3px 1px rgb(255 255 255 / 8%);
}
html:is([data-theme="dim"], [data-theme="dark"]) {
  --appearance-accent-ink: var(--appearance-accent);
  --learning-vocabulary-ink: #6bc5ff; --learning-grammar-ink: #b39cff; --learning-fast-ink: #f8c669;
}
html[data-design] body[data-app-surface="feed"] {
  --blue: var(--appearance-accent); --accent: var(--appearance-accent);
  --primary: var(--appearance-accent); --primary-foreground: var(--appearance-on-accent);
  --ai-accent: var(--appearance-accent); --ai-accent-soft: var(--appearance-accent-soft);
  --ai-accent-border: color-mix(in srgb, var(--appearance-accent) 25%, var(--line));
  --focus-ring: color-mix(in srgb, var(--appearance-accent) 60%, transparent);
  --viewport-gutter: 0px; --viewport-gutter-total: 0px;
  background: var(--canvas); color: var(--ink); padding: 0;
  font-family: var(--appearance-font); -webkit-font-smoothing: antialiased;
}
html[data-design] .phone-shell {
  --topbar-total-height: calc(var(--topbar-base-height) + var(--safe-area-top));
  --tabbar-total-height: calc(var(--tabbar-base-height) + env(safe-area-inset-bottom, 0px));
}
html[data-design] .topbar [hidden] { display: none; }

/* Pulse: a quiet editorial canvas, crisp typography and a restrained signature. */
html[data-design="pulse"][data-theme="light"] {
  --canvas: #f4f5f5; --line: #e6e9e9; --hairline: #edf0f0;
  --surface-soft: #f3f6f6; --surface-muted: #f8fafa;
}
html[data-design="pulse"][data-theme="dark"] {
  --canvas: #080a0b; --white: #0e1113; --background: #0e1113; --surface: #0e1113;
  --surface-raised: #15191c; --surface-soft: #1b2023; --surface-muted: #121719;
  --line: #283035; --hairline: #22292d; --muted: #97a4ac;
}
html[data-design="pulse"] .phone-shell {
  --topbar-base-height: 64px; --tabbar-base-height: 64px;
  max-width: 640px; width: min(100%, 640px); height: 100dvh; max-height: 100dvh;
  border: 1px solid var(--line); border-block: 0; border-radius: 0;
  box-shadow: 0 0 80px rgb(15 20 25 / 3%);
}
html[data-design="pulse"] .topbar {
  padding-inline: 20px; grid-template-columns: 44px minmax(0, 1fr) 44px;
  background: color-mix(in srgb, var(--white) 92%, transparent);
  backdrop-filter: blur(18px); border-bottom-color: var(--line);
}
html[data-design="pulse"] .topbar h1 { letter-spacing: -.6px; font-weight: 750; }
html[data-design="pulse"] .compose-toggle {
  width: 38px; height: 38px; border-radius: 50%; color: var(--active-pill-text); background: var(--active-pill);
}
html[data-design="pulse"] .compose-toggle svg { width: 21px; height: 21px; }
html[data-design="pulse"] .post { padding: 22px 22px 12px; gap: 12px; grid-template-columns: 42px minmax(0, 1fr); }
html[data-design="pulse"] .post > .avatar { width: 42px; height: 42px; border: 0; box-shadow: none; }
html[data-design="pulse"] .post-copy { line-height: 1.55; letter-spacing: -.1px; }
html[data-design="pulse"] .post-head { margin-bottom: 4px; }
html[data-design="pulse"] .post-actions { justify-content: space-between; margin-top: 14px; gap: 6px; }
html[data-design="pulse"] .post-actions > button { width: 36px; min-width: 36px; height: 36px; }
html[data-design="pulse"] .post::before { left: 42px; top: 64px; }
html[data-design="pulse"] .post.is-thread-reply { background: var(--white); }
html[data-design="pulse"] .fast-card { padding: 24px 22px; gap: 18px; }
html[data-design="pulse"] .fast-card-title { letter-spacing: -.7px; }
html[data-design="pulse"] .fast-card-example { border: 1px solid var(--line); border-radius: 16px; padding: 16px; background: var(--surface-muted); }
html[data-design="pulse"] .fast-card-head { letter-spacing: .07em; text-transform: uppercase; }
html[data-design="pulse"] .fast-card-identity { padding-bottom: 12px; border-bottom: 1px solid var(--hairline); }
html[data-design="pulse"] .composer { padding: 18px 22px; grid-template-columns: 42px minmax(0, 1fr); background: var(--surface-muted); }
html[data-design="pulse"] .post-button { background: var(--active-pill); color: var(--active-pill-text); padding-inline: 24px; border-radius: 999px; min-height: 38px; }
html[data-design="pulse"] .post-media-grid,
html[data-design="pulse"] .post-inline-media-button { border-radius: 18px; border-color: var(--line); overflow: hidden; }
html[data-design="pulse"] .tabbar { background: color-mix(in srgb, var(--white) 95%, transparent); backdrop-filter: blur(18px); border-top-color: var(--line); }
html[data-design="pulse"] .tabbar a { position: relative; }
html[data-design="pulse"] .tabbar a.active::before { content: ""; position: absolute; width: 18px; height: 3px; top: 0; border-radius: 0 0 3px 3px; background: var(--appearance-accent); }
html[data-design="pulse"] .tabbar a.active { color: var(--ink); }

/* Twitter: measured 600px timeline, 53px chrome, 16px gutters and 40px avatars. */
html[data-design="twitter"] .phone-shell {
  --topbar-base-height: 53px; --tabbar-base-height: 53px;
  max-width: 600px; width: min(100%, 600px); height: 100dvh; max-height: 100dvh;
  border: 1px solid var(--line); border-block: 0; border-radius: 0; box-shadow: none;
}
html[data-design="twitter"] { --appearance-accent-ink: var(--appearance-accent); }
/* Chirp is shared by both designs. Unsupported glyphs use the system fallback,
   while Latin text inside Hebrew blocks still uses Chirp. */
html[data-design="twitter"] .topbar {
  min-height: var(--topbar-total-height); padding-inline: 16px;
  grid-template-columns: 40px minmax(0, 1fr) 40px;
  background: color-mix(in srgb, var(--white) 85%, transparent); backdrop-filter: blur(12px);
}
html[data-design="twitter"] .topbar h1 { font-size: var(--app-font-topbar); font-weight: 700; letter-spacing: 0; }
html[data-design="twitter"] .topbar .mini-avatar { width: 32px; height: 32px; }
html[data-design="twitter"] .topbar .avatar-button:not([hidden]) { width: 40px; height: 40px; display: grid; place-items: center; }
html[data-design="twitter"] .topbar .compose-toggle { width: 36px; height: 36px; border-radius: 50%; }
html[data-design="twitter"] .post,
html[data-design="twitter"] .composer {
  grid-template-columns: 40px minmax(0, 1fr); gap: 8px; padding: 12px 16px 0;
}
html[data-design="twitter"] .post > .avatar,
html[data-design="twitter"] .composer > .avatar { width: 40px; height: 40px; border: 0; box-shadow: none; }
html[data-design="twitter"] .post-avatar { border: 0; box-shadow: none; }
html[data-design="twitter"] .post-head { margin: 0 0 2px; }
html[data-design="twitter"] .post-head :is(p, strong, span) { font-size: var(--app-font-ui); line-height: 20px; letter-spacing: 0; }
html[data-design="twitter"] .post-head strong { font-weight: 700; }
html[data-design="twitter"] .post-head p { display: flex; align-items: baseline; flex-wrap: wrap; column-gap: 4px; }
html[data-design="twitter"] .post-copy { font-size: var(--app-font-ui); line-height: 1.333333; margin-block: 0; letter-spacing: 0; }
html[data-design="twitter"] .post-copy .pulse-streamdown :where(p, ul, ol, blockquote, pre, table) { margin-block: .65em; }
html[data-design="twitter"] .post-copy .pulse-streamdown > :first-child { margin-top: 0; }
html[data-design="twitter"] .post-actions { justify-content: space-between; gap: 2px; margin: 8px -8px 4px; }
html[data-design="twitter"] .post-actions > button { width: 34px; height: 34px; min-width: 34px; }
html[data-design="twitter"] .post-actions svg { width: 18.75px; height: 18.75px; stroke-width: 1.8; }
html[data-design="twitter"] .post-actions > button:is(.is-active, [aria-pressed="true"]) { color: var(--appearance-accent); }
html[data-design="twitter"] .post::before { left: 35px; top: 52px; }
html[data-design="twitter"] .post.is-thread-reply,
html[data-design="twitter"] .thread-card .post.is-thread-reply.is-acknowledged { background: var(--white); }
html[data-design="twitter"] .thread-replies .post { padding-top: 8px; }
html[data-design="twitter"] .post-media-grid { border: 1px solid var(--line); border-radius: 16px; gap: 2px; margin-top: 12px; overflow: hidden; }
html[data-design="twitter"] .post-inline-media-button { border-radius: 16px; border: 1px solid var(--line); overflow: hidden; }
html[data-design="twitter"] .post-tags { margin-top: 8px; gap: 8px; }
html[data-design="twitter"] .post-tags span { border: 0; background: transparent; padding: 0; color: var(--appearance-accent-ink); border-radius: 0; font-weight: 400; }
html[data-design="twitter"] .composer { padding-bottom: 12px; }
html[data-design="twitter"] .composer textarea { font-size: var(--app-font-input); line-height: 1.4; }
html[data-design="twitter"] .post-button { background: var(--active-pill); color: var(--active-pill-text); border-radius: 999px; padding: 0 16px; min-height: 36px; font-weight: 700; }
html[data-design="twitter"] .tabbar { background: color-mix(in srgb, var(--white) 90%, transparent); backdrop-filter: blur(12px); }
html[data-design="twitter"] .tabbar { padding-top: 0; padding-bottom: env(safe-area-inset-bottom, 0px); }
html[data-design="twitter"] .tabbar a { color: var(--ink); min-height: 53px; justify-content: center; }
html[data-design="twitter"] .tabbar a svg { width: 26px; height: 26px; stroke-width: 1.75; }
html[data-design="twitter"] .tabbar a span { font-size: var(--app-font-2xs); }
html[data-design="twitter"] .tabbar a > span {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
html[data-design="twitter"] .tabbar a.active { color: var(--ink); font-weight: 700; }
html[data-design="twitter"] .tabbar a.active svg { stroke-width: 2.4; }
html[data-design="twitter"] .fast-card { padding: 16px; gap: 14px; }
html[data-design="twitter"] .fast-card-example { background: var(--surface-soft); border: 1px solid var(--line); border-radius: 16px; padding: 12px 16px; }

/* Shared surfaces: use the same palette, including those mounted outside the shell. */
html[data-design] :is(.post-menu-panel, .learning-panel, .hanzi-practice-dialog) {
  background: var(--white); border-color: var(--line); box-shadow: var(--appearance-panel-shadow);
}
html[data-design] :is(.post-menu-panel, .learning-panel) { border-radius: 24px 24px 0 0; }
html[data-design] .post-menu-options :is(button, a) { border-radius: 0; padding: 12px 8px; font-size: var(--app-font-ui); line-height: 1.4; }
html[data-design] .post-menu-options :is(button, a):hover { background: var(--appearance-hover); }
html[data-design] .post-menu-cancel { border: 1px solid var(--border); border-radius: 999px; background: var(--white); }
html[data-design] .learning-save { color: var(--appearance-accent-ink); }
html[data-design] :is(.post-copy, .pulse-streamdown, .fast-card-copy) a { color: var(--appearance-accent-ink); }
html[data-design] :is(.exam-text, .ai-chat-web-button[aria-pressed="true"]) { color: var(--appearance-accent-ink); }
html[data-design] .learning-sheet-head { min-height: 53px; }
html[data-design] .learning-panel :is(input, textarea, select) { border-color: var(--border); border-radius: 8px; }
html[data-design] :is(.learning-card, .learning-source-note) { background: var(--surface-muted); border-color: var(--line); }
html[data-design] :is(.post-actions button, .icon-button, .tool):hover { color: var(--appearance-accent-ink); background: var(--appearance-accent-soft); }
html[data-design] :is(.post-actions button, .icon-button, .tool):focus-visible { outline: 2px solid var(--appearance-accent); outline-offset: 3px; }
html[data-design] .title-list-menu { padding: 6px 16px 12px; background: transparent; border: 0; box-shadow: none; }
html[data-design] .list-strip { border-radius: 16px; background: var(--white); border: 1px solid var(--line); box-shadow: var(--appearance-panel-shadow); padding: 4px 0; }
html[data-design] .list-strip button { border-radius: 0; min-height: 48px; padding: 10px 16px; }
html[data-design] .list-strip button:hover { background: var(--appearance-hover); }
html[data-design] .list-strip button.active { color: var(--ink); background: var(--surface-soft); }
html[data-design] .list-menu-check { color: var(--appearance-accent-ink); }
html[data-design] .list-detail-card { padding: 20px 16px; background: var(--white); }
html[data-design] .list-detail-main h2 { white-space: normal; overflow-wrap: anywhere; line-height: 1.3; }
html[data-design] .list-detail-card button { border-radius: 999px; }
html[data-design] .list-description-card { padding: 16px; }
html[data-design] .source-toc-card { padding: 18px 16px; }
html[data-design] .source-toc-row { border-radius: 12px; }
html[data-design] .source-toc-row.is-learned { background: color-mix(in srgb, var(--success) 7%, var(--white)); }
html[data-design] .learned-group-toggle { background: var(--surface-soft); }
html[data-design] .list-detail-card.is-visual-pilot { background: var(--surface-muted); border-color: var(--line); }
html[data-design] .list-detail-kicker { color: var(--appearance-accent-ink); }
html[data-design] .profile-workspace .mp-profile { background: var(--white); box-shadow: var(--appearance-shadow); max-width: 360px; }
html[data-design] .profile-workspace .mp-sheet-head { min-height: 62px; padding-block: calc(8px + var(--safe-area-top)) 8px; }
html[data-design] .profile-workspace .mp-menu-row { min-height: 58px; font-size: var(--app-font-ui); font-weight: 600; }
html[data-design] .profile-workspace .mp-menu-row > svg { width: 24px; height: 24px; color: var(--ink); }
html[data-design] .profile-workspace .mp-widget { background: var(--white); border-radius: 16px; }
html[data-design] .profile-workspace .mp-primary { border-radius: 999px; background: var(--active-pill); color: var(--active-pill-text); }
html[data-design] .profile-workspace .mp-search input { border-radius: 999px; background: var(--surface-soft); border-color: transparent; }
html[data-design] .profile-workspace .mp-search input:focus { border-color: var(--appearance-accent); background: var(--white); }
html[data-design] .access-panel input { border: 1px solid var(--border); min-height: 56px; border-radius: 6px; }
html[data-design] .access-actions button { border-radius: 999px; }
html[data-design] .access-primary { background: var(--active-pill); color: var(--active-pill-text); }
html[data-design] .access-empty { padding: 48px 28px; max-width: 440px; margin: auto; }
html[data-design] .access-empty h2 { font-size: 31px; letter-spacing: -.8px; line-height: 1.15; }
html[data-design] .access-empty button { border-radius: 999px; min-height: 44px; }
html[data-design] .empty-feed { padding: 36px 24px; color: var(--muted); line-height: 1.55; }
html[data-design] .ai-chat-page { background: var(--white); color: var(--ink); }
html[data-design] .ai-chat-topbar { background: color-mix(in srgb, var(--white) 92%, transparent); backdrop-filter: blur(12px); border-color: var(--line); }
html[data-design] .ai-chat-form { border-color: var(--border); border-radius: 20px; box-shadow: none; }
html[data-design] .ai-message.is-user { background: var(--surface-soft); color: var(--ink); }
html[data-design] .exam-heading { min-height: 64px; }
html[data-design] :is(.exam-primary, .exam-secondary) { border-radius: 999px; }
html[data-design] .exam-primary { background: var(--active-pill); color: var(--active-pill-text); border-color: var(--active-pill); }
html[data-design] .exam-rating { background: var(--white); border-color: var(--line); border-radius: 16px; min-height: 76px; }
html[data-design] .exam-rating:hover { background: var(--surface-soft); border-color: var(--appearance-accent); }
html[data-theme="light"] .hanzi-practice-dialog { --practice-green: #507b67; --practice-error: #b14f56; }
html:is([data-theme="dark"], [data-theme="dim"]) .hanzi-practice-dialog { --practice-green: #82a994; --practice-error: #cf878b; }
html[data-design] .hanzi-practice-dialog { border-radius: 20px; color: var(--ink); }
html[data-design] .hanzi-writer-stage { border-radius: 12px; }
html[data-design] .hanzi-practice-tools button.is-active { background: var(--appearance-accent-soft); }

/* Neutral is the exact social timeline. Category adds an opt-in learning cue. */
html[data-post-colors="neutral"] :is(.post, .fast-card, .fast-card.has-media) { background: var(--white); }
html[data-post-colors="neutral"] .learning-type-badge { color: var(--muted); background: var(--surface-soft); border-color: var(--line); }
html[data-post-colors="category"] .post.is-learning-vocabulary { --post-category: var(--learning-vocabulary); }
html[data-post-colors="category"] .post.is-learning-grammar { --post-category: var(--learning-grammar); }
html[data-post-colors="category"] :is(.post.is-learning-fast, .fast-card) { --post-category: var(--learning-fast); }
html[data-post-colors="category"] :is(.post.is-learning-vocabulary, .post.is-learning-grammar, .post.is-learning-fast, .fast-card) {
  background: color-mix(in srgb, var(--post-category, var(--appearance-accent)) 5%, var(--white));
  box-shadow: inset 3px 0 0 color-mix(in srgb, var(--post-category, var(--appearance-accent)) 65%, transparent);
}

/* Display: a real preview and comfortably sized, keyboard-accessible controls. */
.appearance-settings { display: grid; gap: 28px; padding-bottom: 30px; color: var(--ink); }
.appearance-section { min-width: 0; display: grid; gap: 13px; border: 0; padding: 0; margin: 0; }
.appearance-section-heading h3 { margin: 0; font-size: var(--app-font-ui, 15px); line-height: 1.4; font-weight: 700; }
.appearance-section-heading p { margin: 5px 0 0; color: var(--muted); font-size: var(--app-font-sm, 13px); line-height: 1.5; }
.appearance-design-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.appearance-design-card { position: relative; display: grid; gap: 5px; min-width: 0; padding: 10px 10px 13px; border: 1px solid var(--line); border-radius: 16px; background: var(--white); color: var(--ink); text-align: start; cursor: pointer; }
.appearance-selection { position: absolute; top: 15px; right: 15px; display: grid; place-items: center; width: 22px; height: 22px; background: var(--appearance-accent); color: var(--appearance-on-accent); border-radius: 50%; }
.appearance-selection svg { width: 14px; height: 14px; stroke-width: 2.5; }
.appearance-design-card:is(.is-active, [aria-pressed="true"]) { border-color: var(--appearance-accent); box-shadow: 0 0 0 1px var(--appearance-accent); }
.appearance-design-card strong { font-size: var(--app-font-md, 14px); line-height: 1.4; }
.appearance-design-card small { color: var(--muted); font-size: var(--app-font-xs, 12px); line-height: 1.45; }
.appearance-design-miniature { display: flex; gap: 8px; height: 84px; border: 1px solid var(--line); border-radius: 9px; overflow: hidden; background: var(--surface-muted); margin-bottom: 5px; padding: 10px; }
.appearance-mini-nav { width: 20%; border-inline-end: 1px solid var(--line); background: repeating-linear-gradient(to bottom, var(--ink) 0 3px, transparent 3px 12px); opacity: .35; }
.appearance-mini-feed { flex: 1; background: repeating-linear-gradient(to bottom, var(--line) 0 2px, transparent 2px 15px); border-top: 5px solid var(--appearance-accent); }
[data-appearance-design="pulse"] .appearance-design-miniature { border-radius: 12px; padding: 12px; background: var(--surface-soft); }
[data-appearance-design="pulse"] .appearance-mini-feed { border-radius: 5px; background-color: var(--white); box-shadow: 0 2px 5px #0000000a; }
[data-appearance-design="twitter"] .appearance-design-miniature { border-radius: 0; background: var(--white); padding: 8px; }
.appearance-preview { display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 12px; border: 1px solid var(--line); border-radius: 16px; padding: 16px; background: var(--white); }
.appearance-preview-avatar { width: 40px; height: 40px; border-radius: 50%; object-fit: cover; background: var(--appearance-accent-soft); color: var(--appearance-accent-ink); display: grid; place-items: center; font-weight: 700; }
.appearance-preview-body { min-width: 0; }
.appearance-preview-author { display: flex; align-items: center; flex-wrap: wrap; gap: 4px; margin: 0; font-size: var(--app-font-sm, 13px); line-height: 1.45; }
.appearance-preview-author span { color: var(--muted); }
.appearance-preview-copy { font-size: var(--app-font-ui, 15px); line-height: 1.5; margin: 5px 0 12px; overflow-wrap: anywhere; }
.appearance-preview-copy a, .appearance-preview-copy em { color: var(--appearance-accent-ink); font-style: normal; }
.appearance-preview-actions { display: flex; justify-content: space-between; color: var(--muted); gap: 12px; }
.appearance-preview-actions svg { width: 18px; height: 18px; }
.appearance-theme-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.appearance-theme-option { display: grid; align-items: center; grid-template-columns: 26px minmax(0, 1fr); gap: 3px 10px; min-height: 66px; border: 1px solid var(--line); padding: 10px 12px; background: var(--white); color: var(--ink); border-radius: 12px; font-size: var(--app-font-sm, 13px); font-weight: 600; text-align: start; cursor: pointer; }
.appearance-theme-option small { grid-column: 2; color: var(--muted); font-size: var(--app-font-2xs, 11px); font-weight: 400; line-height: 1.4; }
.appearance-theme-option strong { line-height: 1.35; }
.appearance-theme-option:is(.is-active, [aria-pressed="true"]) { border-color: var(--appearance-accent); box-shadow: inset 0 0 0 1px var(--appearance-accent); }
.appearance-theme-sample { display: grid; place-items: center; grid-row: span 2; width: 26px; height: 26px; border: 1px solid #cfd9de; border-radius: 50%; background: #fff; color: #0f1419; }
.appearance-theme-sample i { display: none; }
.appearance-theme-sample svg { width: 15px; height: 15px; stroke-width: 2.5; }
[data-appearance-theme="dark"] .appearance-theme-sample, [data-appearance-theme="dim"] .appearance-theme-sample { color: #fff; }
[data-appearance-theme="system"] .appearance-theme-sample { background: linear-gradient(90deg, #fff 50%, #15202b 50%); }
[data-appearance-theme="dim"] .appearance-theme-sample { background: #15202b; border-color: #38444d; }
[data-appearance-theme="dark"] .appearance-theme-sample { background: #000; border-color: #536471; }
.appearance-accent-options { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 5px; }
.appearance-accent-option { display: flex; align-items: center; flex-direction: column; gap: 8px; border: 0; padding: 4px 0; min-width: 0; background: transparent; color: var(--ink); cursor: pointer; }
.appearance-swatch { --swatch-color: #1d9bf0; display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; background: var(--swatch-color); border: 3px solid var(--white); box-shadow: 0 0 0 1px transparent; position: relative; }
[data-appearance-accent="yellow"] .appearance-swatch { --swatch-color: #ffd400; }
[data-appearance-accent="pink"] .appearance-swatch { --swatch-color: #f91880; }
[data-appearance-accent="purple"] .appearance-swatch { --swatch-color: #7856ff; }
[data-appearance-accent="orange"] .appearance-swatch { --swatch-color: #ff7a00; }
[data-appearance-accent="green"] .appearance-swatch { --swatch-color: #00ba7c; }
.appearance-accent-option:is(.is-active, [aria-pressed="true"]) .appearance-swatch { box-shadow: 0 0 0 2px var(--swatch-color); }
.appearance-swatch svg { width: 20px; height: 20px; color: #fff; stroke-width: 2.5; }
.appearance-accent-option[data-appearance-accent="yellow"] .appearance-swatch svg,
.appearance-accent-option[data-appearance-accent="orange"] .appearance-swatch svg,
.appearance-accent-option[data-appearance-accent="green"] .appearance-swatch svg { color: #0f1419; }
.appearance-accent-label { font-size: var(--app-font-2xs, 11px); color: var(--muted); text-align: center; overflow-wrap: anywhere; }
.appearance-post-options { display: grid; gap: 10px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.appearance-post-option { min-height: 48px; background: var(--white); border: 1px solid var(--line); color: var(--ink); border-radius: 12px; padding: 12px; cursor: pointer; font-size: var(--app-font-sm, 13px); line-height: 1.4; }
.appearance-post-option:is(.is-active, [aria-pressed="true"]) { border-color: var(--appearance-accent); background: var(--appearance-accent-soft); }
.appearance-post-option strong, .appearance-post-option small { display: block; }
.appearance-post-option small { color: var(--muted); font-weight: 400; font-size: var(--app-font-xs, 12px); margin-top: 4px; }
.appearance-status { margin: 0; color: var(--muted); font-size: var(--app-font-xs, 12px); line-height: 1.5; }
.appearance-settings button:focus-visible { outline: 2px solid var(--appearance-accent); outline-offset: 4px; }

/* A full desktop workspace while the mobile timeline stays edge-to-edge. */
.feed-workspace { width: 100%; display: flex; justify-content: center; min-height: 100dvh; }
.feed-desktop-nav, .feed-desktop-aside { display: none; }
@media (min-width: 700px) {
  html[data-design] .feed-workspace { display: grid; grid-template-columns: 76px minmax(0, 640px); justify-content: center; align-items: start; }
  html[data-design="twitter"] .feed-workspace { grid-template-columns: 76px minmax(0, 600px); }
  .feed-desktop-nav { display: flex; position: sticky; top: 0; height: 100dvh; min-height: 0; flex-direction: column; padding: 12px 12px 18px; gap: 14px; overflow-y: auto; scrollbar-width: thin; }
  .feed-brand { display: flex; align-items: center; gap: 10px; padding: 8px; min-height: 48px; color: var(--ink); text-decoration: none; font-size: 25px; font-weight: 750; letter-spacing: -1px; }
  .feed-brand svg { flex-shrink: 0; width: 30px; height: 30px; }
  .feed-brand span, .feed-desktop-link span, .feed-desktop-compose span, .feed-desktop-account > :not(img) { display: none; }
  .feed-brand .feed-brand-mark { display: grid; place-items: center; }
  .feed-desktop-links { display: grid; gap: 6px; }
  .feed-desktop-link { color: var(--ink); min-width: 0; text-decoration: none; background: transparent; border: 0; display: flex; align-items: center; gap: 18px; padding: 12px; min-height: 50px; width: fit-content; max-width: 100%; border-radius: 999px; cursor: pointer; font: inherit; text-align: start; }
  .feed-desktop-link svg { flex-shrink: 0; width: 26px; height: 26px; }
  .feed-desktop-link:hover, .feed-desktop-account:hover { background: var(--appearance-hover); }
  .feed-desktop-link.active { font-weight: 750; }
  .feed-desktop-link.active svg { stroke-width: 2.5; }
  .feed-desktop-compose { display: flex; align-items: center; justify-content: center; gap: 12px; border-radius: 999px; background: var(--active-pill); color: var(--active-pill-text); border: 0; min-height: 50px; padding: 13px; font-size: 17px; line-height: 1.4; font-weight: 700; cursor: pointer; }
  .feed-desktop-compose svg { width: 24px; height: 24px; }
  .feed-desktop-account { margin-top: auto; display: flex; align-items: center; gap: 10px; min-width: 0; padding: 8px; background: transparent; border: 0; color: var(--ink); border-radius: 999px; cursor: pointer; text-align: start; }
  .feed-desktop-account img { width: 40px; height: 40px; border-radius: 50%; object-fit: cover; }
  .feed-desktop-account small { color: var(--muted); }
  .feed-desktop-account strong { display: block; }
  html[data-design] .feed-workspace .phone-shell { width: 100%; max-width: 100%; }
  html[data-design] .sidebar { position: fixed; inset: 0; }
  html[data-design] .profile-workspace .mp-sheet { inset: 5dvh auto auto 50%; transform: translateX(-50%); width: min(600px, calc(100vw - 48px)); height: min(90dvh, 920px); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--appearance-panel-shadow); animation: none; }
  html[data-design] .profile-workspace .mp-profile { top: 5dvh; left: 50%; transform: translateX(-50%); width: 360px; height: min(90dvh, 860px); border: 1px solid var(--line); border-radius: 20px; animation: none; }
  /* These overlays are mounted inside .app-screen by the legacy bridge.
     Fixed roots make the backdrop cover both desktop rails as well. */
  html[data-design] :is(.media-viewer, .post-menu-sheet, .learning-sheet) { position: fixed; inset: 0; }
  html[data-design] :is(.post-menu-backdrop, .learning-sheet-backdrop) { background: rgb(91 112 131 / 40%); }
  html[data-design] :is(.post-menu-panel, .learning-panel) { inset: auto; left: 50%; top: 50%; transform: translate(-50%, -50%); width: min(600px, calc(100vw - 48px)); max-height: min(90dvh, 920px); border: 1px solid var(--line); border-radius: 20px; }
  html[data-design] .post-menu-panel { width: min(440px, calc(100vw - 48px)); }
  html[data-design] .media-viewer-shell { width: 100%; height: 100dvh; grid-template-rows: 53px minmax(0, 1fr); }
  html[data-design] .media-viewer-topbar { min-height: 53px; }
  html[data-design] .media-viewer-stage { padding: 12px 64px 24px; }
  html[data-design] .media-viewer-stage img { max-width: 100%; max-height: 100%; object-fit: contain; }
}
@media (min-width: 700px) and (max-width: 799px) {
  html[data-design="pulse"] .feed-workspace { display: flex; }
  html[data-design="pulse"] :is(.feed-desktop-nav, .feed-desktop-aside) { display: none; }
  html[data-design="pulse"] .feed-workspace .phone-shell { max-width: 640px; }
}
@media (min-width: 1100px) {
  html[data-design] .feed-workspace { grid-template-columns: 220px minmax(0, 600px) 290px; max-width: 1170px; margin-inline: auto; }
  .feed-desktop-nav { padding: 10px 20px 18px 8px; }
  .feed-brand span, .feed-desktop-link span, .feed-desktop-compose span, .feed-desktop-account > :not(img) { display: block; }
  .feed-brand .feed-brand-dot { display: inline; color: var(--appearance-accent); }
  .feed-brand .feed-brand-mark { display: grid; }
  .feed-desktop-link { font-size: 20px; letter-spacing: -.3px; }
  .feed-desktop-compose { width: 100%; min-height: 52px; }
  .feed-desktop-compose svg { display: none; }
  .feed-desktop-account { padding: 12px; }
  .feed-desktop-aside { display: grid; align-content: start; gap: 16px; padding: 16px 0 24px 24px; position: sticky; top: 0; max-height: 100dvh; overflow-y: auto; scrollbar-width: thin; }
  .feed-aside-intro { padding: 20px 16px 6px; }
  .feed-aside-intro h2 { font-size: 30px; line-height: 1.1; letter-spacing: -1.25px; font-weight: 700; margin: 16px 0 12px; }
  .feed-aside-intro p { font-size: 14px; line-height: 1.6; color: var(--muted); margin: 0 0 12px; }
  html[data-design="twitter"] .feed-aside-intro { padding-top: 8px; }
  html[data-design="twitter"] .feed-aside-intro h2 { font-size: 26px; letter-spacing: -.8px; }
  .feed-aside-search { display: flex; align-items: center; gap: 10px; min-height: 44px; border: 1px solid var(--line); border-radius: 999px; background: var(--white); padding: 10px 16px; color: var(--muted); font-size: 14px; }
  .feed-aside-search svg { width: 18px; height: 18px; flex-shrink: 0; }
  .feed-aside-card { background: var(--white); border: 1px solid var(--line); border-radius: 16px; padding: 18px 16px; overflow: hidden; }
  .feed-aside-kicker { margin: 0 0 8px; color: var(--muted); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; font-weight: 600; }
  .feed-aside-heading { margin: 0 0 12px; font-size: 20px; letter-spacing: -.5px; font-weight: 750; line-height: 1.2; }
  .feed-aside-card > p { font-size: 14px; line-height: 1.5; color: var(--muted); }
  .feed-aside-row { display: flex; align-items: center; gap: 12px; min-width: 0; padding: 14px 0; text-decoration: none; color: var(--ink); border-top: 1px solid var(--line); }
  .feed-aside-row:first-of-type { border-top: 0; }
  .feed-aside-row svg { flex-shrink: 0; width: 22px; height: 22px; }
  .feed-aside-row span { flex: 1; min-width: 0; }
  .feed-aside-row > svg:last-child { width: 16px; height: 16px; color: var(--muted); }
  .feed-aside-row strong { display: block; font-size: 14px; line-height: 1.4; }
  .feed-aside-row small { display: block; font-size: 12px; line-height: 1.5; color: var(--muted); margin-top: 3px; }
  .feed-aside-row:hover { color: var(--appearance-accent-ink); }
  .feed-aside-footer { color: var(--muted); font-size: 12px; line-height: 1.7; padding-inline: 12px; }
  .feed-aside-footer button { display: flex; align-items: center; gap: 6px; background: transparent; padding: 8px 0; border: 0; color: var(--muted); font: inherit; cursor: pointer; }
  .feed-aside-footer button svg { width: 14px; height: 14px; }
}
@media (min-width: 1280px) {
  html[data-design] .feed-workspace { grid-template-columns: 240px minmax(0, 640px) 320px; max-width: 1200px; }
  html[data-design="twitter"] .feed-workspace { grid-template-columns: 259px 600px 380px; max-width: 1239px; }
  html[data-design="twitter"] .feed-desktop-aside { padding-left: 30px; }
  html[data-design="twitter"] .feed-aside-card { width: 350px; }
}
@media (max-width: 799px) {
  html[data-design] .phone-shell { max-width: 100%; width: 100%; border: 0; }
  html[data-design] .post { padding-inline: 16px; }
  html[data-design="pulse"] .post::before { left: 36px; }
  html[data-design] .composer { padding-inline: 16px; }
  html[data-design] .hanzi-practice-dialog { border-radius: 0; }
}
@media (max-width: 360px) {
  .appearance-accent-options { grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 12px; }
  .appearance-design-options, .appearance-theme-options { gap: 8px; }
  .appearance-theme-option { padding: 10px 8px; gap: 7px; }
}

/* User-requested large text takes priority over matching fixed reference sizes. */
html[data-design]:is([data-text-scale="large"], [data-text-scale="extra-large"], [data-text-scale="huge"]) .phone-shell { --topbar-base-height: 76px; --tabbar-base-height: 80px; }
html[data-design][data-text-scale="huge"] .phone-shell { --topbar-base-height: 102px; --tabbar-base-height: 112px; }
html[data-design]:is([data-text-scale="large"], [data-text-scale="extra-large"], [data-text-scale="huge"]) :is(.topbar h1, .view-title-button, .view-title-button span, .learning-sheet-head h2, .list-detail-main h2) { white-space: normal; overflow: visible; text-overflow: clip; line-height: 1.25; overflow-wrap: anywhere; }
html[data-design]:is([data-text-scale="large"], [data-text-scale="extra-large"], [data-text-scale="huge"]) .post-head :is(p, strong, span) { line-height: 1.35; }
html[data-design]:is([data-text-scale="large"], [data-text-scale="extra-large"], [data-text-scale="huge"]) .appearance-design-options,
html[data-design]:is([data-text-scale="large"], [data-text-scale="extra-large"], [data-text-scale="huge"]) .appearance-theme-options,
html[data-design][data-text-scale="huge"] .appearance-post-options { grid-template-columns: 1fr; }
html[data-design]:is([data-text-scale="large"], [data-text-scale="extra-large"], [data-text-scale="huge"]) .appearance-accent-options { grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 14px; }
html[data-design]:is([data-text-scale="large"], [data-text-scale="extra-large"], [data-text-scale="huge"]) .learning-sheet-head { grid-template-columns: auto minmax(0, 1fr) auto; gap: 8px; padding-block: 12px; }
html[data-design]:is([data-text-scale="large"], [data-text-scale="extra-large"], [data-text-scale="huge"]) .profile-workspace .mp-recent-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
html[data-design]:is([data-text-scale="large"], [data-text-scale="extra-large"], [data-text-scale="huge"]) .exam-history-row { flex-wrap: wrap; }
html[data-design][data-text-scale="huge"] .appearance-preview { grid-template-columns: 1fr; }
html[data-design][data-text-scale="huge"] .exam-ratings { grid-template-columns: 1fr; }
@media (min-width: 800px) {
  html[data-design] .feed-workspace .phone-shell { --tabbar-base-height: 0px; --tabbar-total-height: 0px; }
  html[data-design] .feed-workspace .tabbar { display: none; }
  html[data-design] .feed-workspace .feed { padding-bottom: 0; }
}
@media (prefers-reduced-motion: reduce) {
  html[data-design] :is(.post, .post-actions button, .feed-desktop-link, .appearance-settings button) { transition: none; }
}

/* Fresh X-031 source: 12px popup radius, 20px filled icons, 44px single-line
   rows and the two-layer source shadow. Learning actions keep their labels. */
html[data-design="twitter"] .post-menu-sheet { position: fixed; inset: 0; }
html[data-design="twitter"] .post-menu-backdrop { background: transparent; animation: none; }
html[data-design="twitter"] .post-menu-panel {
  position: fixed; inset: auto; left: var(--post-menu-left, 8px); top: var(--post-menu-top, 8px);
  width: min(300px, calc(100vw - 16px)); max-height: calc(100dvh - 16px);
  padding: 0; border: 0; border-radius: 12px; background: var(--white);
  box-shadow: var(--appearance-panel-shadow); transform: none; animation: none; overflow: hidden;
}
html[data-design="twitter"] :is(.post-menu-grabber, .post-menu-cancel) { display: none; }
html[data-design="twitter"] .post-menu-options { padding: 0; }
html[data-design="twitter"] .post-menu-options :is(button, a) {
  min-height: 44px; padding: 12px 16px; gap: 12px; font-weight: 700; line-height: 1.333333;
}
html[data-design="twitter"] .post-menu-options :is(button, a) span { min-width: 0; overflow-wrap: anywhere; }
html[data-design="twitter"] .post-menu-options svg { width: 20px; height: 20px; }
@media (min-width: 700px) and (max-width: 799px) {
  html[data-design="twitter"] .feed-workspace .phone-shell { border-inline: 1px solid var(--line); --tabbar-base-height: 0px; --tabbar-total-height: 0px; }
  html[data-design="twitter"] .feed-workspace .tabbar { display: none; }
  html[data-design="twitter"] .feed-workspace .feed { padding-bottom: 0; }
}