:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #667085;
  --line: #d9dee8;
  --soft: #f5f7fa;
  --paper: #ffffff;
  --accent: #1664d9;
  --accent-dark: #0f4ea9;
  --success: #16794c;
  --danger: #b42318;
}

* { box-sizing: border-box; }
body { margin: 0; background: #eef1f5; color: var(--ink); font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; }
a { color: inherit; }
.topbar { height: 64px; display: flex; align-items: center; justify-content: space-between; padding: 0 max(14px, calc((100% - 1800px) / 2)); background: var(--paper); border-bottom: 1px solid var(--line); }
.brand { font-weight: 800; text-decoration: none; letter-spacing: .01em; }
.brand span { color: var(--accent); font-weight: 600; }
nav { display: flex; gap: 22px; color: var(--muted); }
nav a { text-decoration: none; }
nav a:hover, nav a:focus { color: var(--accent); }
.shell { width: min(1800px, calc(100% - 28px)); margin: 0 auto; padding: 22px 0 36px; }
.intro { max-width: 720px; margin-bottom: 26px; }
.eyebrow { margin: 0 0 8px; color: var(--accent); font-size: 13px; font-weight: 800; letter-spacing: .08em; }
h1 { margin: 0; font-size: clamp(30px, 5vw, 48px); line-height: 1.15; letter-spacing: 0; }
.lede { margin: 14px 0 0; color: var(--muted); font-size: 17px; }
.workspace { background: var(--paper); border: 1px solid var(--line); border-radius: 8px; box-shadow: 0 10px 24px rgba(23, 32, 51, .06); overflow: hidden; }
.modebar { display: flex; gap: 4px; padding: 10px 12px 0; border-bottom: 1px solid var(--line); }
.mode, button { font: inherit; cursor: pointer; }
.mode { border: 0; border-bottom: 3px solid transparent; background: transparent; color: var(--muted); padding: 11px 16px 10px; font-weight: 700; }
.mode.active { border-color: var(--accent); color: var(--accent); }
.panes { display: grid; grid-template-columns: 1fr; gap: 14px; align-items: center; padding: 16px; }
.pane { min-width: 0; }
.pane-head, .pane-foot { display: flex; align-items: center; justify-content: space-between; color: var(--muted); font-size: 13px; }
.pane-head { margin-bottom: 8px; }
label { color: var(--ink); font-weight: 750; }
label span { color: var(--accent); }
.quiet { border: 0; padding: 3px 0; background: transparent; color: var(--accent); font-size: 13px; }
.quiet:disabled { color: #a7afbd; cursor: not-allowed; }
textarea { width: 100%; min-height: 360px; resize: vertical; border: 1px solid var(--line); border-radius: 6px; padding: 14px; background: #fbfcfe; color: #111827; font: 13px/1.65 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; outline: none; }
textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(22, 100, 217, .12); }
textarea[readonly] { background: #f7f9fc; }
.pane-foot { padding-top: 7px; }
.swap { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 50%; background: #eaf1fc; color: var(--accent); font-size: 22px; font-weight: 700; }
.actionbar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; padding: 0 22px 22px; }
.primary, .secondary { min-height: 40px; border-radius: 5px; padding: 0 15px; font-weight: 700; }
.primary { border: 1px solid var(--accent); background: var(--accent); color: white; }
.primary:hover { background: var(--accent-dark); }
.secondary { border: 1px solid var(--line); background: white; color: var(--ink); }
.secondary:hover { border-color: var(--accent); color: var(--accent); }
button:focus-visible, a:focus-visible { outline: 3px solid rgba(22, 100, 217, .3); outline-offset: 2px; }
.status { margin-left: auto; color: var(--muted); }
.status.ok { color: var(--success); }
.status.error { color: var(--danger); }
.notes { display: grid; grid-template-columns: 1fr; gap: 14px; margin-top: 18px; }
.notes div { display: grid; gap: 3px; padding: 15px 16px; border-left: 3px solid #c8d5eb; background: rgba(255,255,255,.72); }
.notes span { color: var(--muted); font-size: 13px; }
.footer { padding: 0 22px 36px; text-align: center; color: var(--muted); font-size: 13px; }
.footer a { color: var(--accent); text-decoration: none; }
@media (min-width: 761px) {
  .shell { width: min(1800px, calc(100% - 36px)); }
  .panes { grid-template-columns: minmax(0, 1fr) 42px minmax(0, 1fr); gap: 18px; padding: 22px; }
  .notes { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1200px) { .shell { width: min(1800px, calc(100% - 48px)); min-width: 1200px; } }
@media (max-width: 760px) {
  .topbar { height: auto; min-height: 62px; gap: 12px; padding: 13px 18px; }
  nav { gap: 12px; font-size: 13px; }
  .shell { padding: 38px 14px 30px; }
  .panes { grid-template-columns: 1fr; gap: 14px; padding: 16px; }
  .swap { transform: rotate(90deg); justify-self: center; }
  textarea { min-height: 230px; }
  .actionbar { padding: 0 16px 16px; }
  .status { width: 100%; margin-left: 0; }
  .notes { grid-template-columns: 1fr; }
}