:root {
  --bg: #fafafa;
  --fg: #1a1a1a;
  --muted: #666;
  --border: #ddd;
  --accent: #2563eb;
  --ok: #16a34a;
  --err: #dc2626;
  --warn: #d97706;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a1a;
    --fg: #e8e8e8;
    --muted: #999;
    --border: #333;
    --accent: #60a5fa;
    --ok: #4ade80;
    --err: #f87171;
    --warn: #fbbf24;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
}
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}
h1 { font-size: 20px; margin: 0 0 24px; }
h1 small { color: var(--muted); font-weight: normal; font-size: 13px; }
h2 { font-size: 16px; margin: 0 0 12px; }
label { display: block; margin-bottom: 14px; font-size: 13px; color: var(--muted); }
input[type="password"], input[type="text"], textarea {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 10px;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
}
input[type="password"] { max-width: 360px; }
textarea { min-height: 320px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; resize: vertical; }
label.file { color: var(--muted); }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 4px; }
button {
  padding: 9px 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  font: inherit;
  cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: 0.5; cursor: wait; }
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
button.ghost { border-color: transparent; color: var(--muted); }
.warn { padding: 10px 12px; background: color-mix(in srgb, var(--warn) 12%, transparent); border-left: 3px solid var(--warn); border-radius: 4px; font-size: 13px; }
.meta { color: var(--muted); font-size: 12px; margin: 0 0 10px; }
.msg { margin-top: 18px; padding: 10px 12px; border-radius: 6px; font-size: 13px; }
.msg.ok { background: color-mix(in srgb, var(--ok) 14%, transparent); color: var(--ok); }
.msg.err { background: color-mix(in srgb, var(--err) 14%, transparent); color: var(--err); }
.msg.warn { background: color-mix(in srgb, var(--warn) 14%, transparent); color: var(--warn); }
.msg.info { background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent); }
input[type="text"] { max-width: 420px; }
.hint { color: var(--muted); font-size: 12px; margin: 4px 0 12px; }
.toolbar { margin: 4px 0 16px; }
.file-list { list-style: none; padding: 0; margin: 0 0 8px; }
.file-item { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 10px 12px; border: 1px solid var(--border); border-radius: 6px; margin-bottom: 8px; }
.file-meta { display: flex; flex-direction: column; min-width: 0; }
.fname { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 14px; word-break: break-all; }
.fsize { color: var(--muted); font-size: 12px; margin-top: 2px; }
.file-acts { display: flex; gap: 6px; flex-shrink: 0; }
.file-acts button { padding: 5px 11px; font-size: 13px; }
button.danger { color: var(--err); }
button.danger:hover:not(:disabled) { border-color: var(--err); }
#editor { margin-top: 20px; padding: 16px; border: 1px solid var(--border); border-radius: 8px; }
#editor h3 { margin: 0 0 12px; font-size: 15px; }