:root {
  --navy: #1e4a73;
  --cyan: #00a1e4;
  --ink: #2c261d;
  --page: #d6c8b0;
  --panel: #e6dac4;
  --field: #eee3cf;
  --line: #c0ae92;
  --muted: #5f564a;
  --btn: #1e4a73;
  --btn-text: #f4ead8;
  --card-on: #f4ead8;
  font-size: 16px;
}
[data-theme="dim"] {
  --navy: #00a1e4;
  --cyan: #00a1e4;
  --ink: #e8eef6;
  --page: #1a2332;
  --panel: #243044;
  --field: #15202e;
  --line: #3d4f66;
  --muted: #9aadc2;
  --btn: #0080b5;
  --btn-text: #fff;
  --card-on: #1a2332;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: "Atkinson Hyperlegible", system-ui, sans-serif;
  color: var(--ink);
  background: var(--page);
}
#app {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  height: 100%;
  min-height: 100vh;
}
.bar {
  display: flex;
  align-items: center;
  gap: .55rem;
  padding: .45rem .7rem;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: .55rem; margin-right: auto; }
.brand img { border-radius: 7px; }
.brand .sub { display: block; font-size: .68rem; color: var(--muted); }
.tabs, .seg { display: flex; background: var(--field); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.tabs button, .seg button, .ghost, .primary, .reader-tools button, .ask button, .help-card button, .box button {
  font: 700 .82rem "Atkinson Hyperlegible", system-ui, sans-serif;
  border: 0;
  background: transparent;
  color: var(--ink);
  padding: .4rem .75rem;
  cursor: pointer;
}
.tabs button.on, .seg button.on, .reader-tools button.on {
  background: var(--btn);
  color: var(--btn-text);
}
.ghost {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--field);
}
.ghost.round { width: 2rem; height: 2rem; padding: 0; border-radius: 8px; }
.ghost.on, #btn-settings.on { background: var(--btn); color: var(--btn-text); border-color: var(--btn); }
.primary {
  background: var(--btn);
  color: var(--btn-text);
  border-radius: 8px;
  padding: .45rem 1rem;
}
.banner {
  margin: 0;
  padding: .4rem .9rem;
  font-size: .85rem;
  color: var(--muted);
  background: var(--field);
  border-bottom: 1px solid var(--line);
}
.banner a { color: var(--navy); }
.stage {
  display: grid;
  grid-template-columns: 15rem 12rem 1fr;
  min-height: 0;
  overflow: hidden;
}
.cards, .toc {
  overflow: auto;
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: .55rem;
}
.card {
  display: block;
  width: 100%;
  text-align: left;
  border: 1px solid var(--line);
  background: var(--field);
  color: var(--ink);
  border-radius: 8px;
  padding: .55rem .65rem;
  margin-bottom: .45rem;
  cursor: pointer;
  font: inherit;
}
.card.on { outline: 2px solid var(--navy); background: var(--card-on); }
.card small { display: block; color: var(--muted); font-size: .72rem; }
.card .del {
  float: right;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: .85rem;
}
.toc button {
  display: block;
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: .86rem;
  padding: .22rem .3rem;
  cursor: pointer;
  border-bottom: 1px solid var(--line);
}
.toc .k { font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); padding: .2rem .3rem; }
.toc .l2 { padding-left: .85rem; }
.toc .l3 { padding-left: 1.4rem; }
.reader { display: flex; flex-direction: column; min-width: 0; background: var(--page); }
.reader-top {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .35rem .7rem;
  border-bottom: 1px solid var(--line);
  font-size: .82rem;
  color: var(--muted);
}
.reader-top span:first-child { margin-right: auto; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.reader-tools { display: flex; align-items: center; gap: .35rem; }
.reader-tools input[type=range] { width: 5rem; }
.a-sm { font-size: .75rem; } .a-lg { font-size: 1.05rem; font-weight: 700; }
.md, .src {
  flex: 1;
  overflow: auto;
  padding: 1.1rem 1.4rem 2rem;
  line-height: 1.55;
}
.md h1, .md h2, .md h3 { letter-spacing: -0.02em; }
.md img { max-width: 100%; height: auto; border-radius: 6px; }
.src { white-space: pre-wrap; font-family: ui-monospace, Menlo, monospace; font-size: .86rem; }
.ask {
  display: flex;
  gap: .5rem;
  align-items: center;
  padding: .4rem .7rem;
  border-top: 1px solid var(--line);
  background: var(--panel);
}
.ask-model { font-size: .75rem; color: var(--cyan); min-width: 9rem; }
.ask input {
  flex: 1;
  border: 1px solid var(--line);
  background: var(--field);
  color: var(--ink);
  border-radius: 6px;
  padding: .4rem .6rem;
  font: inherit;
}
.ask button { background: var(--btn); color: var(--btn-text); border-radius: 6px; }
.pane { padding: 1.4rem 1.6rem 2.5rem; overflow: auto; max-width: 44rem; }
.pane[hidden], [hidden] { display: none !important; }
.kicker { font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: var(--cyan); }
.lede, .muted { color: var(--muted); }
.drop {
  margin-top: 1rem;
  border: 2px dashed var(--line);
  border-radius: 12px;
  padding: 2.2rem 1rem;
  text-align: center;
  background: var(--field);
}
.drop.hot { border-color: var(--navy); background: var(--panel); }
.job {
  margin-top: .6rem;
  padding: .65rem .8rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--field);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: .75rem;
}
.job.notice {
  border-color: var(--navy);
  background: var(--panel);
}
.job.notice a {
  color: var(--navy);
  font-weight: 700;
  white-space: nowrap;
}
.settings h2 { font-size: 1rem; margin: 1.3rem 0 .45rem; }
.row-set {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: .7rem .85rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--field);
  margin-bottom: .45rem;
}
.row-set em { display: block; font-style: normal; color: var(--muted); font-size: .85rem; }
.box {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--field);
  padding: .75rem .9rem 1rem;
}
.box p { margin: .35rem 0; }
.key-row { display: flex; gap: .4rem; flex: 1; justify-content: flex-end; }
.key-row input { min-width: 12rem; flex: 1; max-width: 22rem; border: 1px solid var(--line); background: var(--page); color: var(--ink); border-radius: 6px; padding: .35rem .5rem; }
select { font: inherit; background: var(--page); color: var(--ink); border: 1px solid var(--line); border-radius: 6px; padding: .25rem .4rem; }
.btn-link { color: var(--navy); }
.modal {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.45);
  display: grid; place-items: center;
  padding: 1rem;
  z-index: 9;
}
.help-card {
  background: var(--panel);
  color: var(--ink);
  border-radius: 14px;
  max-width: 52rem;
  width: 100%;
  max-height: 90vh;
  overflow: auto;
  padding: 1rem 1.1rem 1.3rem;
}
.help-card header { display: flex; justify-content: space-between; align-items: center; }
.help-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .7rem;
  margin-top: .8rem;
}
.help-grid article {
  border: 1px solid var(--line);
  background: var(--field);
  border-radius: 10px;
  padding: .7rem .8rem;
}
.help-grid h3 { margin: 0 0 .3rem; font-size: 1rem; }
.help-grid p { margin: 0; color: var(--muted); font-size: .92rem; max-width: 22rem; }
.md.help-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .7rem;
  padding: 1rem 1.1rem 2rem;
}
.md.help-grid article {
  border: 1px solid var(--line);
  background: var(--field);
  border-radius: 10px;
  padding: .75rem .85rem;
}
.md.help-grid h3 { margin: 0 0 .35rem; font-size: 1rem; }
.md.help-grid p { margin: 0; color: var(--muted); font-size: .92rem; max-width: 22rem; }
@media (max-width: 900px) {
  .stage { grid-template-columns: 8.5rem 7.5rem 1fr; }
  .help-grid, .md.help-grid { grid-template-columns: 1fr; }
  .brand .sub { display: none; }
}