/* Deliberately plain: system fonts, one accent-free palette, no animation.
   The colours are two variables and their dark-scheme overrides. */

:root {
  color-scheme: light dark;
  --fg: #111;
  --dim: #666;
  --line: #ccc;
  --bg: #fff;
  --panel: #f6f6f6;
  --err: #b00;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #ddd;
    --dim: #888;
    --line: #333;
    --bg: #111;
    --panel: #1a1a1a;
    --err: #f66;
  }
}

* {
  box-sizing: border-box;
}

/* Every pane in this file is toggled with the `hidden` attribute, and several
   of them carry a `display` rule — which beats the UA stylesheet's
   `[hidden] { display: none }` and leaves them all on screen at once. */
[hidden] {
  display: none !important;
}

body {
  margin: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  font: 13px/1.5 ui-sans-serif, system-ui, sans-serif;
  color: var(--fg);
  background: var(--bg);
}

h1 {
  font-size: 16px;
}

h2 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--dim);
  margin: 16px 0 6px;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 4px 6px;
}

button {
  cursor: pointer;
  background: var(--panel);
}

button:disabled {
  cursor: default;
  color: var(--dim);
}

.error {
  color: var(--err);
}

/* --- login ------------------------------------------------------------- */

#login {
  margin: auto;
}

#login form {
  display: grid;
  gap: 8px;
  width: 280px;
}

/* --- frame ------------------------------------------------------------- */

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  min-height: 0;
}

header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--line);
}

#quota {
  margin-left: auto;
  display: flex;
  gap: 12px;
  color: var(--dim);
  font-size: 11px;
}

main {
  display: flex;
  flex: 1;
  min-height: 0;
}

aside {
  width: 260px;
  flex: none;
  overflow-y: auto;
  padding: 0 12px 16px;
  border-right: 1px solid var(--line);
}

#new-form {
  display: grid;
  gap: 6px;
  margin-top: 16px;
}

aside ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

aside li {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  padding: 2px 0;
}

aside li.empty {
  color: var(--dim);
}

aside li span:first-child {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

li.session button {
  display: block;
  width: 100%;
  text-align: left;
  border: none;
  background: none;
  padding: 4px 6px;
}

li.session.selected button {
  background: var(--panel);
}

li.session .id {
  display: block;
  font-family: ui-monospace, monospace;
}

li.session .sub {
  display: block;
  color: var(--dim);
  font-size: 11px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#empty,
#session {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  padding: 12px;
  gap: 8px;
}

#empty {
  color: var(--dim);
}

#session-head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

#session-head div {
  flex: 1;
  min-width: 0;
}

#session-meta {
  color: var(--dim);
  font-size: 11px;
}

/* --- transcript -------------------------------------------------------- */

#transcript {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  border: 1px solid var(--line);
  padding: 8px;
  font-family: ui-monospace, monospace;
  font-size: 12px;
}

.ev {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  margin: 2px 0;
}

.ev.meta,
.ev.raw {
  color: var(--dim);
}

.ev.prompt {
  border-left: 2px solid var(--line);
  padding-left: 6px;
  color: var(--dim);
  margin: 10px 0 6px;
}

.ev.text.user {
  color: var(--dim);
}

.ev.tool {
  color: var(--dim);
}

.ev.tool summary {
  cursor: pointer;
}

.ev.error {
  color: var(--err);
}

.ev pre {
  margin: 4px 0 4px 12px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: var(--dim);
}

/* --- composer and files ------------------------------------------------ */

#composer {
  display: grid;
  gap: 6px;
}

#composer textarea {
  width: 100%;
  resize: vertical;
  font-family: ui-monospace, monospace;
}

.row {
  display: flex;
  align-items: center;
  gap: 8px;
}

#composer-status {
  color: var(--dim);
  font-size: 11px;
}

#files {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  border-top: 1px solid var(--line);
  padding-top: 8px;
}

#file-path {
  flex: 1;
  min-width: 120px;
  font-family: ui-monospace, monospace;
}

#file-out {
  flex-basis: 100%;
  margin: 0;
  max-height: 160px;
  overflow: auto;
  color: var(--dim);
  font-size: 11px;
  white-space: pre-wrap;
}