/* Apple-flavored neutral theme: white/gray surfaces, near-black pill
 * buttons, generous radii. Same palette drives the dark scheme with the
 * button colors inverted (light pills on dark), like Apple's own dark UI. */
:root {
  --bg: #ffffff;
  --fg: #1d1d1f;
  --muted: #6e6e73;
  --line: #d2d2d7;
  --card: #f5f5f7;
  --accent: #0066cc; /* links only — controls stay monochrome */
  --btn-bg: #1d1d1f;
  --btn-fg: #ffffff;
  --seg-active: #ffffff; /* selected segment pill */
  --danger: #d70015;
  --add-bg: #e7f6ec;
  --add-fg: #067647;
  --del-bg: #fdecec;
  --del-fg: #b42318;
  --code-bg: #f5f5f7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161617;
    --fg: #f5f5f7;
    --muted: #86868b;
    --line: #38383a;
    --card: #1d1d1f;
    --accent: #2997ff;
    --btn-bg: #f5f5f7;
    --btn-fg: #1d1d1f;
    --seg-active: #48484a;
    --danger: #ff453a;
    --add-bg: #12261a;
    --add-fg: #75e0a7;
    --del-bg: #2d1516;
    --del-fg: #f97066;
    --code-bg: #232326;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, system-ui, "Segoe UI", sans-serif;
  line-height: 1.6;
}
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

#topbar[hidden] { display: none; } /* our display:flex would defeat [hidden] */
#topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  z-index: 10;
}
#brand { font-weight: 600; font-size: 0.95rem; text-decoration: none; color: var(--fg); }
#topbar nav { display: flex; gap: 0.5rem; }

#app { max-width: 52rem; margin: 0 auto; padding: 1rem; }

button {
  font: inherit;
  font-size: 0.9rem;
  border: none;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border-radius: 980px;
  padding: 0.5rem 1.1rem;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity 0.15s ease, background-color 0.15s ease;
}
button:hover { opacity: 0.85; }
button.ghost { background: var(--card); color: var(--fg); }
button.ghost:hover { opacity: 1; background: color-mix(in srgb, var(--fg) 8%, var(--card)); }
button.danger { background: var(--card); color: var(--danger); }
button.danger:hover { opacity: 1; background: color-mix(in srgb, var(--danger) 10%, var(--card)); }
button:disabled { opacity: 0.4; cursor: default; }

input[type="password"], input[type="text"], input[type="search"] {
  font: inherit;
  width: 100%;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
  color: var(--fg);
}

.muted { color: var(--muted); }
.error { color: var(--danger); }

/* Login */
.login-box {
  max-width: 22rem;
  margin: 18vh auto 0;
  display: grid;
  gap: 0.8rem;
  text-align: center;
}
.login-box h1 { font-size: 1.25rem; letter-spacing: -0.01em; margin: 0; }

/* GitHub-style file table */
.toolbar { display: flex; gap: 0.6rem; margin-bottom: 0.8rem; }
.file-table {
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: var(--card);
}
.file-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0.9rem;
  text-decoration: none;
  color: var(--fg);
  border-bottom: 1px solid var(--line);
  font-size: 0.9rem;
}
.file-row:last-child { border-bottom: none; }
.file-row:hover { background: color-mix(in srgb, var(--fg) 5%, var(--card)); }
.file-icon { flex: 0 0 auto; }
.file-name { flex: 0 0 auto; min-width: 10rem; font-weight: 600; }
.file-msg {
  flex: 1 1 auto;
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.file-date { flex: 0 0 auto; color: var(--muted); font-size: 0.8rem; }
.file-table .empty { padding: 0.8rem; margin: 0; }
@media (max-width: 640px) {
  .file-msg { display: none; }
  .file-name { min-width: 0; }
}

/* Breadcrumb + tabs (file view) */
.crumb { margin-bottom: 0.5rem; font-size: 1.05rem; }
.crumb a { color: var(--accent); text-decoration: none; }
/* Apple segmented control: gray track, floating selected pill */
.tabs {
  display: inline-flex;
  gap: 2px;
  background: var(--card);
  border-radius: 980px;
  padding: 3px;
  margin-right: auto;
}
.tab {
  border: none;
  border-radius: 980px;
  background: transparent;
  color: var(--muted);
  padding: 0.35rem 0.95rem;
}
.tab:hover { opacity: 1; color: var(--fg); }
.tab.active {
  background: var(--seg-active);
  color: var(--fg);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.14);
}
.raw {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.9rem;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

/* Reader */
.doc-head { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin-bottom: 0.6rem; }
.doc-head h1 { font-size: 1.2rem; letter-spacing: -0.01em; margin: 0 auto 0 0; }
.rendered { overflow-wrap: anywhere; }
.rendered h1 { font-size: 1.5rem; letter-spacing: -0.01em; }
.rendered h2 { border-bottom: 1px solid var(--line); padding-bottom: 0.2rem; }
.rendered blockquote { border-left: 3px solid var(--line); margin: 0.6rem 0; padding: 0.1rem 0.9rem; color: var(--muted); }
.rendered code { background: var(--code-bg); border-radius: 6px; padding: 0.1em 0.35em; font-size: 0.9em; }
.rendered pre { background: var(--code-bg); border-radius: 12px; padding: 0.8rem; overflow-x: auto; }
.rendered pre code { background: none; padding: 0; }
.rendered img { max-width: 100%; border-radius: 12px; }
.rendered a { color: var(--accent); }
.rendered table { border-collapse: collapse; display: block; overflow-x: auto; }
.rendered th, .rendered td { border: 1px solid var(--line); padding: 0.3rem 0.6rem; }

/* History */
.version-list { list-style: none; margin: 0 0 1rem; padding: 0; display: grid; gap: 0.4rem; }
.version-list li {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  padding: 0.55rem 0.9rem;
}
.version-list li.selected { border-color: var(--fg); }
.version-list .row { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
.version-list .msg { flex: 1 1 12rem; overflow-wrap: anywhere; }
.version-list .when { font-size: 0.8rem; color: var(--muted); }
.version-list .actor { font-size: 0.75rem; border: 1px solid var(--line); border-radius: 999px; padding: 0 0.5rem; color: var(--muted); }

.diff {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.6rem 0;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
  line-height: 1.5;
}
.diff div { padding: 0 0.8rem; white-space: pre-wrap; overflow-wrap: anywhere; }
.diff .add { background: var(--add-bg); color: var(--add-fg); }
.diff .del { background: var(--del-bg); color: var(--del-fg); }

.banner {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 14px;
  padding: 0.6rem 0.9rem;
  margin-bottom: 0.8rem;
}