/* Chat-app skin: past chats grouped by day on the left, a minimal top bar with a model picker,
   the page in a narrow centred column like an assistant message, a composer pinned at the bottom. Dark tokens are in dark.css. */
html[data-skin="chatgpt"] {
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  --bg: #ffffff; --fg: #0d0d0d; --muted: #5d5d5d; --line: #e5e5e5; --subtle: #f4f4f4;
  --accent: #2f6be0; --good: #1f8a52; --bad: #d23b3b; --focus: #2f6be0;
  --cg-side: #f9f9f9; --cg-hover: #ececec; --cg-sel: #e3e3e3; --cg-bubble: #f1f1f1; --cg-ink: #0d0d0d; --cg-ink-fg: #ffffff;
  --rail-w: auto;
}
[data-skin="chatgpt"] body { font-size: 15px; line-height: 1.65; background: var(--bg); }

[data-skin="chatgpt"] .app { display: grid; grid-template-columns: 260px minmax(0, 1fr); grid-template-rows: auto 1fr auto; }
[data-skin="chatgpt"] .app-body { display: contents; }
[data-skin="chatgpt"] .app-side { grid-column: 1; grid-row: 1 / 4; position: sticky; top: 0; height: 100vh; height: 100dvh; display: flex; flex-direction: column; gap: 1px; padding: 8px; background: var(--cg-side); border-right: 1px solid var(--line); font-size: 14px; overflow-y: auto; scrollbar-width: thin; }
[data-skin="chatgpt"] .app-top { grid-column: 2; grid-row: 1; position: sticky; top: 0; z-index: 20; background: var(--bg); }
[data-skin="chatgpt"] .app-stage { grid-column: 2; grid-row: 2; width: 100%; max-width: 816px; margin: 0 auto; padding: 12px 24px 24px; }
[data-skin="chatgpt"] .app-foot { grid-column: 2; grid-row: 3; position: sticky; bottom: 0; z-index: 20; padding: 0 24px 8px; background: var(--bg); }

/* top bar */
[data-skin="chatgpt"] .cg-nav { display: flex; align-items: center; gap: 6px; height: 52px; padding: 0 12px; }
[data-skin="chatgpt"] .cg-iconbtn { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 8px; color: var(--muted); flex: none; }
[data-skin="chatgpt"] .cg-iconbtn:hover { background: var(--cg-hover); }
[data-skin="chatgpt"] .cg-iconbtn svg { width: 18px; height: 18px; }
[data-skin="chatgpt"] .cg-burger { display: none !important; }
[data-skin="chatgpt"] .cg-model { display: inline-flex; align-items: center; gap: 6px; height: 36px; padding: 0 10px; border-radius: 8px; font-size: 17px; font-weight: 500; white-space: nowrap; }
[data-skin="chatgpt"] .cg-model:hover { background: var(--cg-hover); }
[data-skin="chatgpt"] .cg-model svg { color: var(--muted); }
[data-skin="chatgpt"] .cg-share { display: inline-flex; align-items: center; gap: 6px; height: 36px; padding: 0 12px; border: 1px solid var(--line); border-radius: 999px; font-size: 14px; font-weight: 500; }
[data-skin="chatgpt"] .skin-btn { height: 36px; padding: 0 10px; border: 0; border-radius: 8px; color: var(--muted); }
[data-skin="chatgpt"] .skin-btn:hover { background: var(--cg-hover); }
[data-skin="chatgpt"] .cg-me { display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: #c2410c; color: #fff; font-size: 13px; font-weight: 600; flex: none; margin-left: 2px; }
[data-skin="chatgpt"] .cg-mark { display: grid; width: 26px; height: 26px; flex: none; color: var(--cg-ink); --logo-fg: var(--cg-ink-fg); }

/* sidebar */
[data-skin="chatgpt"] .cg-sidetop { display: flex; align-items: center; height: 44px; padding: 0 4px 0 8px; margin-bottom: 6px; }
[data-skin="chatgpt"] .cg-item, [data-skin="chatgpt"] .cg-chat { display: flex; align-items: center; gap: 10px; flex: none; height: 36px; padding: 0 10px; border-radius: 10px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
[data-skin="chatgpt"] .cg-item svg { color: var(--fg); }
[data-skin="chatgpt"] a.cg-item:hover, [data-skin="chatgpt"] a.cg-chat:hover { background: var(--cg-hover); }
[data-skin="chatgpt"] .cg-chat { display: block; line-height: 36px; }
[data-skin="chatgpt"] .cg-chat.on { background: var(--cg-sel); }
[data-skin="chatgpt"] .cg-group { padding: 18px 10px 6px; font-size: 12px; font-weight: 600; color: var(--muted); }
[data-skin="chatgpt"] .cg-plan { display: flex; align-items: center; gap: 10px; margin-top: 12px; padding: 10px; border-top: 1px solid var(--line); }
[data-skin="chatgpt"] .cg-plan > svg { width: 28px; height: 28px; padding: 6px; border-radius: 50%; border: 1px solid var(--line); flex: none; }
[data-skin="chatgpt"] .cg-plan b { display: block; font-weight: 500; }
[data-skin="chatgpt"] .cg-plan small { display: block; font-size: 12px; color: var(--muted); line-height: 1.3; }

/* the turn */
[data-skin="chatgpt"] .page-head { margin: 12px 0 16px; }
[data-skin="chatgpt"] .cg-user { display: flex; justify-content: flex-end; margin-bottom: 28px; }
[data-skin="chatgpt"] .cg-user p { max-width: 70%; padding: 10px 18px; border-radius: 22px; background: var(--cg-bubble); }
[data-skin="chatgpt"] .cg-h1 { font-size: 22px; font-weight: 600; line-height: 1.4; letter-spacing: -.01em; }
[data-skin="chatgpt"] .page-cols { flex-direction: column; gap: 24px; }
[data-skin="chatgpt"] .page-rail { width: auto; padding-top: 20px; border-top: 1px solid var(--line); }
[data-skin="chatgpt"] body[data-page="match"] .page-rail { order: -1; padding: 0 0 20px; border: 0; border-bottom: 1px solid var(--line); }
[data-skin="chatgpt"] .cg-railhead { margin-bottom: 10px; font-size: 16px; font-weight: 600; }
[data-skin="chatgpt"] .nw-foot { margin: 28px 0 0; }

/* composer (decorative) */
[data-skin="chatgpt"] .cg-composer { max-width: 768px; margin: 0 auto; }
[data-skin="chatgpt"] .cg-box { display: flex; align-items: center; gap: 12px; min-height: 56px; padding: 10px 10px 10px 16px; border-radius: 28px; background: var(--bg); box-shadow: 0 0 0 1px var(--line), 0 4px 16px rgba(0, 0, 0, .06); color: var(--muted); }
[data-skin="chatgpt"] .cg-box > svg { width: 20px; height: 20px; flex: none; }
[data-skin="chatgpt"] .cg-ph { font-size: 16px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
[data-skin="chatgpt"] .cg-send { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; background: var(--cg-ink); color: var(--cg-ink-fg); flex: none; }
[data-skin="chatgpt"] .cg-note { padding-top: 8px; text-align: center; font-size: 12px; color: var(--muted); }
[data-skin="chatgpt"] .fb-btn { bottom: 104px; }
[data-skin="chatgpt"] body[data-page="chat"] .app-foot { display: none; }
[data-skin="chatgpt"] body[data-page="chat"] .fb-btn { bottom: 16px; }

/* hub: a markdown reply */
[data-skin="chatgpt"] .cg-md { line-height: 1.75; }
[data-skin="chatgpt"] .cg-md p { margin: 0 0 14px; }
[data-skin="chatgpt"] .cg-md hr { border: 0; border-top: 1px solid var(--line); margin: 22px 0; }
[data-skin="chatgpt"] .cg-md h2 { font-size: 18px; font-weight: 600; margin: 22px 0 8px; }
[data-skin="chatgpt"] .cg-md ul { margin: 0 0 8px; padding-left: 1.4em; }
[data-skin="chatgpt"] .cg-md li { margin: 4px 0; padding-left: 2px; }
[data-skin="chatgpt"] .cg-md a { text-decoration: underline; text-decoration-color: rgba(127, 127, 127, .5); text-underline-offset: 3px; }
[data-skin="chatgpt"] .cg-md a:hover { text-decoration-color: currentColor; }
[data-skin="chatgpt"] .cg-code { margin: 0 0 14px; border-radius: 14px; overflow: hidden; background: var(--subtle); }
[data-skin="chatgpt"] .cg-codehead { display: flex; justify-content: space-between; align-items: center; padding: 8px 14px; font-size: 12px; color: var(--muted); }
[data-skin="chatgpt"] .cg-codehead span:last-child { display: inline-flex; align-items: center; gap: 4px; }
[data-skin="chatgpt"] .cg-codehead svg { width: 13px; height: 13px; }
[data-skin="chatgpt"] .cg-code pre { margin: 0; padding: 4px 16px 14px; font: 14px/1.7 var(--mono); overflow-x: auto; }
[data-skin="chatgpt"] .cg-acts { display: flex; gap: 14px; margin-top: 4px; color: var(--muted); }
[data-skin="chatgpt"] .flip { display: inline-flex; transform: rotate(180deg); }

/* shared page parts */
[data-skin="chatgpt"] kbd { background: var(--subtle); border-color: var(--line); color: var(--fg); border-radius: 6px; }
[data-skin="chatgpt"] .cd-input { border: 1px solid var(--line); border-radius: 8px; background: var(--bg); padding: 2px 8px; font-size: 14px; }
[data-skin="chatgpt"] .cd-input:focus { outline: 2px solid var(--focus); outline-offset: -1px; }
[data-skin="chatgpt"] .btn { display: inline-flex; align-items: center; gap: 6px; height: 36px; padding: 0 16px; border-radius: 999px; cursor: pointer; border: 1px solid var(--line); background: var(--bg); color: var(--fg); font-size: 14px; font-weight: 500; white-space: nowrap; }
[data-skin="chatgpt"] .btn:hover { background: var(--subtle); }
[data-skin="chatgpt"] .btn.primary { background: var(--cg-ink); border-color: var(--cg-ink); color: var(--cg-ink-fg); }
[data-skin="chatgpt"] .btn.primary:hover { opacity: .85; background: var(--cg-ink); }
[data-skin="chatgpt"] .result-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
[data-skin="chatgpt"] .field { padding: 0 0 14px; }
[data-skin="chatgpt"] .field + .field { padding-top: 14px; border-top: 1px solid var(--line); }
[data-skin="chatgpt"] .field-label { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
[data-skin="chatgpt"] .modes { display: flex; flex-wrap: wrap; gap: 8px; }
[data-skin="chatgpt"] .mode { display: flex; gap: 8px; align-items: flex-start; padding: 8px 14px; border: 1px solid var(--line); border-radius: 14px; cursor: pointer; }
[data-skin="chatgpt"] .mode:hover { background: var(--subtle); }
[data-skin="chatgpt"] .mode:has(input:checked) { border-color: var(--fg); }
[data-skin="chatgpt"] .mode input { margin: 5px 0 0; accent-color: var(--cg-ink); }
[data-skin="chatgpt"] .mode b { display: block; font-weight: 600; font-size: 14px; }
[data-skin="chatgpt"] .mode small { color: var(--muted); font-size: 12px; }
[data-skin="chatgpt"] .labels { display: flex; flex-wrap: wrap; gap: 6px; }
[data-skin="chatgpt"] .lbl { padding: 2px 10px; border-radius: 8px; font-size: 13px; background: var(--subtle); color: var(--fg); }
[data-skin="chatgpt"] .hint { color: var(--muted); }
/* the match thread: chat messages */
[data-skin="chatgpt"] .entry { margin: 0 0 24px; }
[data-skin="chatgpt"] .entry-av { display: none; }
[data-skin="chatgpt"] .entry-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
[data-skin="chatgpt"] .entry-title { color: var(--fg); font-weight: 600; font-size: 16px; }
[data-skin="chatgpt"] .entry-score { padding: 0 8px; border-radius: 6px; background: var(--subtle); color: var(--fg); font-size: 12px; font-weight: 600; line-height: 22px; }
[data-skin="chatgpt"] .entry-body p + p { margin-top: 10px; }
[data-skin="chatgpt"] .entry-body .chips, [data-skin="chatgpt"] .entry-body .mission { margin-top: 10px; }
[data-skin="chatgpt"] .entry-body .criterion { color: var(--muted); }
[data-skin="chatgpt"] .entry.solo { padding: 12px 16px; border-left: 3px solid #e0a100; background: var(--subtle); border-radius: 0 12px 12px 0; }
[data-skin="chatgpt"] .composer { padding: 14px 16px; border-radius: 24px; box-shadow: 0 0 0 1px var(--line), 0 4px 16px rgba(0, 0, 0, .05); }
[data-skin="chatgpt"] .composer .name-input { width: 100%; min-height: 44px; padding: 6px 4px; }
[data-skin="chatgpt"] .composer-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 10px; flex-wrap: wrap; }
[data-skin="chatgpt"] .game {
  --board-bg: var(--subtle); --cell-bg: rgba(0, 0, 0, .05); --tile-radius: 10px; --board-radius: 18px;
  --t2-bg: #ffffff; --t2-fg: #0d0d0d; --t4-bg: #e8e8e8; --t4-fg: #0d0d0d; --t8-bg: #cfcfcf; --t8-fg: #0d0d0d;
  --t16-bg: #a8a8a8; --t16-fg: #fff; --t32-bg: #7a7a7a; --t32-fg: #fff; --t64-bg: #4d4d4d; --t64-fg: #fff;
  --t128-bg: #2f6be0; --t128-fg: #fff; --t256-bg: #1f8a52; --t256-fg: #fff; --t512-bg: #c2410c; --t512-fg: #fff;
  --t1024-bg: #7c3aed; --t1024-fg: #fff; --t2048-bg: #0d0d0d; --t2048-fg: #fff;
}

@media (max-width: 800px) {
  [data-skin="chatgpt"] .app { grid-template-columns: minmax(0, 1fr); }
  [data-skin="chatgpt"] .app-side { display: none; }
  [data-skin="chatgpt"] .app-top, [data-skin="chatgpt"] .app-stage, [data-skin="chatgpt"] .app-foot { grid-column: 1; }
  [data-skin="chatgpt"] .cg-nav { padding: 0 6px; gap: 2px; border-bottom: 1px solid var(--line); }
  [data-skin="chatgpt"] .cg-burger { display: grid !important; margin: 0 4px 0 6px; }
  [data-skin="chatgpt"] .cg-model { font-size: 16px; padding: 0 6px; }
  [data-skin="chatgpt"] .skin-btn { padding: 0 8px; }
  [data-skin="chatgpt"] .app-stage { padding: 8px 16px 16px; }
  [data-skin="chatgpt"] .cg-user p { max-width: 86%; }
  [data-skin="chatgpt"] .cg-h1 { font-size: 20px; }
  [data-skin="chatgpt"] .app-foot { padding: 6px 12px 10px; }
  [data-skin="chatgpt"] .cg-box { min-height: 48px; padding: 6px 6px 6px 14px; }
  [data-skin="chatgpt"] .cg-send { width: 34px; height: 34px; }
  [data-skin="chatgpt"] .fb-btn { bottom: 72px; }
}