:root {
  --bg: #f5f6f8; --card: #ffffff; --text: #16191f; --muted: #5d6573; --line: #e3e6eb;
  --accent: #1f63c6; --accent-soft: rgba(31, 99, 198, .1); --danger: #c62828;
  --code-bg: #fbfbfc; --gutter: #9aa1ad;
  --add-bg: #e6f6ea; --add-mark: #b4e5c0; --del-bg: #fdecec; --del-mark: #f6c2c2; --hunk: #eef3fb;
  --tk-kw: #a626a4; --tk-str: #2f7d32; --tk-com: #8a929e; --tk-num: #b15c00; --tk-fn: #1f63c6; --tk-tag: #c2185b;
  --radius: 14px; --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115; --card: #181b21; --text: #e7e9ee; --muted: #9aa2b1; --line: #2a2f38;
    --accent: #7cc4ff; --accent-soft: rgba(124, 196, 255, .12); --danger: #ff6b6b;
    --code-bg: #13161b; --gutter: #5b6270;
    --add-bg: #12301c; --add-mark: #1d5230; --del-bg: #3a1618; --del-mark: #5e2226; --hunk: #172235;
    --tk-kw: #d394f0; --tk-str: #9bdc8a; --tk-com: #6f7886; --tk-num: #f5b06b; --tk-fn: #7cc4ff; --tk-tag: #ff8fb8;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--text); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 16px 48px; }
header.top { display: flex; align-items: center; gap: 16px; padding: 18px 0 14px; flex-wrap: wrap; }
header.top .brand { font-weight: 700; font-size: 18px; color: var(--text); }
header.top nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
header.top nav a { padding: 6px 12px; border-radius: 999px; color: var(--muted); font-weight: 500; }
header.top nav a.on { background: var(--accent-soft); color: var(--accent); }
header.top nav a:hover { text-decoration: none; color: var(--accent); }
h1 { font-size: 26px; margin: 8px 0 4px; }
.sub { color: var(--muted); margin: 0 0 20px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.proj { padding: 18px; display: block; color: var(--text); transition: border-color .15s; }
.proj:hover { border-color: var(--accent); text-decoration: none; }
.proj h3 { margin: 0 0 6px; font-size: 17px; }
.proj p { margin: 0 0 10px; color: var(--muted); font-size: 14px; }
.meta { color: var(--muted); font-size: 13px; }
.pill { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-weight: 600; }
button, .btn { font: inherit; font-size: 14px; font-weight: 600; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--text); padding: 7px 14px; cursor: pointer; display: inline-flex; align-items: center; gap: 6px; }
button:hover, .btn:hover { border-color: var(--accent); text-decoration: none; }
button.primary, .btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
@media (prefers-color-scheme: dark) { button.primary, .btn.primary { color: #0f1115; } }
button.danger { color: var(--danger); }
button:disabled { opacity: .5; cursor: default; }
input, textarea, select { font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; width: 100%; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
label { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin: 10px 0 4px; }

/* browse layout */
.browser { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 14px; align-items: start; }
.tree { padding: 8px; max-height: calc(100vh - 120px); overflow: auto; position: sticky; top: 12px; font-size: 14px; }
.tree .dir > summary { cursor: pointer; padding: 3px 6px; border-radius: 6px; font-weight: 600; list-style: none; }
.tree .dir > summary::before { content: "\25B8"; display: inline-block; width: 14px; color: var(--muted); transition: transform .1s; }
.tree .dir[open] > summary::before { transform: rotate(90deg); }
.tree .kids { padding-left: 12px; }
.tree a.file { display: block; padding: 3px 6px 3px 20px; border-radius: 6px; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tree a.file:hover { background: var(--accent-soft); text-decoration: none; }
.tree a.file.on { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.tree a.file.mod::after { content: " \25CF"; color: var(--tk-num); }
.viewer { min-width: 0; overflow: hidden; }
.vhead { display: flex; align-items: center; gap: 10px; padding: 10px 14px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.vhead .path { font-family: var(--mono); font-size: 13px; word-break: break-all; flex: 1; min-width: 160px; }
.vhead .actions { display: flex; gap: 8px; flex-wrap: wrap; }
.empty { padding: 40px 16px; text-align: center; color: var(--muted); }
.toggle-tree { display: none; }

/* code */
.code { overflow: auto; max-height: calc(100vh - 150px); background: var(--code-bg); border-radius: 0 0 var(--radius) var(--radius); }
table.lines { border-collapse: collapse; font: 13px/1.55 var(--mono); width: 100%; tab-size: 4; }
table.lines td { padding: 0 12px; vertical-align: top; white-space: pre; }
table.lines td.ln { color: var(--gutter); text-align: right; user-select: none; width: 1%; padding-right: 10px; border-right: 1px solid var(--line); position: sticky; left: 0; background: var(--code-bg); }
table.lines td.mk { width: 1%; padding: 0 4px; user-select: none; color: var(--muted); }
tr.add td.src, tr.add td.mk { background: var(--add-bg); }
tr.del td.src, tr.del td.mk { background: var(--del-bg); }
tr.add td.ln { background: var(--add-mark); }
tr.del td.ln { background: var(--del-mark); }
tr.hunk td { background: var(--hunk); color: var(--muted); padding: 2px 12px; }
td.src.add { background: var(--add-bg); } td.src.del { background: var(--del-bg); }
td.ln.add { background: var(--add-mark); } td.ln.del { background: var(--del-mark); }
td.src.blank, td.ln.blank { background: repeating-linear-gradient(45deg, transparent 0 4px, var(--line) 4px 5px); }
.tk-kw { color: var(--tk-kw); } .tk-str { color: var(--tk-str); } .tk-com { color: var(--tk-com); font-style: italic; }
.tk-num { color: var(--tk-num); } .tk-fn { color: var(--tk-fn); } .tk-tag { color: var(--tk-tag); }

/* editor */
.editor { display: flex; background: var(--code-bg); height: calc(100vh - 220px); min-height: 360px; overflow: hidden; }
.editor .gut { font: 13px/1.55 var(--mono); color: var(--gutter); text-align: right; padding: 8px 10px 8px 12px; border-right: 1px solid var(--line); overflow: hidden; user-select: none; white-space: pre; min-width: 48px; }
.editor textarea { flex: 1; border: 0; border-radius: 0; background: transparent; font: 13px/1.55 var(--mono); padding: 8px 12px; resize: none; white-space: pre; overflow: auto; tab-size: 4; outline: none; }
.changes { padding: 12px 14px; border-top: 1px solid var(--line); display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.changes .list { flex: 1; font-size: 13px; color: var(--muted); min-width: 160px; }

/* dialog */
dialog { border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); color: var(--text); padding: 20px; width: min(520px, calc(100vw - 32px)); }
dialog::backdrop { background: rgba(0, 0, 0, .45); }
dialog h2 { margin: 0 0 4px; font-size: 19px; }
.row { display: flex; gap: 8px; justify-content: flex-end; margin-top: 16px; flex-wrap: wrap; }
.err { color: var(--danger); font-size: 14px; margin-top: 8px; min-height: 1em; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* edits list */
.filters { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.filters a { padding: 5px 12px; border-radius: 999px; border: 1px solid var(--line); background: var(--card); color: var(--muted); font-size: 14px; }
.filters a.on { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.edits { display: flex; flex-direction: column; gap: 10px; }
.edit { padding: 14px 16px; display: flex; gap: 12px; align-items: center; }
.edit .main { flex: 1; min-width: 0; }
.edit .title { font-weight: 600; font-size: 16px; color: var(--text); word-wrap: break-word; }
.edit .title:hover { color: var(--accent); }
.post-head { padding: 16px 18px; margin-bottom: 14px; }
.post-head h1 { margin: 0 0 6px; word-wrap: break-word; }
.post-head .desc { white-space: pre-wrap; margin: 10px 0 0; word-wrap: break-word; }
.filediff { margin-bottom: 14px; overflow: hidden; }
.filediff .code { max-height: none; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.seg button { border: 0; border-radius: 0; }
.seg button.on { background: var(--accent-soft); color: var(--accent); }
.notice { padding: 10px 14px; margin-bottom: 14px; font-size: 14px; color: var(--muted); }

@media (max-width: 760px) {
  .browser { grid-template-columns: 1fr; }
  .tree { position: static; max-height: 45vh; display: none; }
  .browser.show-tree .tree { display: block; }
  .toggle-tree { display: inline-flex; }
  .code { max-height: 70vh; }
  .editor { height: 60vh; }
  h1 { font-size: 22px; }
}

/* side-by-side diff: two equal columns, long lines wrap */
table.lines.split { table-layout: fixed; }
table.lines.split td.ln { position: static; width: 48px; }
table.lines.split td.src { white-space: pre-wrap; word-break: break-all; overflow-wrap: anywhere; }
@media (max-width: 760px) { table.lines.split td.ln { width: 34px; padding: 0 4px; } table.lines.split td.src { padding: 0 6px; font-size: 12px; } }