:root {
  color-scheme: dark;
  --bg: #181818;
  --chrome: #141414;
  --text: #f0f0f0;
  --text-2: color-mix(in srgb, #f0f0f0 74%, transparent);
  --text-3: color-mix(in srgb, #f0f0f0 60%, transparent);
  --stroke: color-mix(in srgb, #f0f0f0 12%, transparent);
  --fill: color-mix(in srgb, #f0f0f0 14%, transparent);
  --bubble: #222;
  --user: #2c2c2c;
  --accent: #c7ec6b;
  --danger: #fc6b83;
  --radius: 18px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; background: var(--bg); color: var(--text); }
button, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
textarea { font-size: 16px; } /* iOS: avoid zoom */

.shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  height: 100dvh;
  height: 100svh;
  background: var(--bg);
}

.sidebar {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--chrome);
  border-right: 1px solid var(--stroke);
  padding-top: var(--safe-top);
}
.sidebar-header, .chat-header, .computer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 51px;
  padding: 0 12px;
  border-bottom: 1px solid var(--stroke);
}
.session-list { flex: 1; overflow: auto; padding: 8px; }
.session-item {
  display: grid;
  gap: 4px;
  width: 100%;
  min-height: 58px;
  padding: 10px;
  text-align: left;
  background: transparent;
  border: 0;
  border-radius: 12px;
}
.session-item:hover, .session-item.active { background: var(--fill); }
.session-item small { color: var(--text-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sidebar-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px calc(10px + var(--safe-bottom));
  border-top: 1px solid var(--stroke);
}
.sidebar-footer small, .identity small, #header-status { color: var(--text-3); display: block; }

.avatar {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--accent);
  color: #141414;
  font-weight: 700;
}
.avatar.sm { width: 28px; height: 28px; font-size: 13px; }

.stage { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.chat-header { padding-top: var(--safe-top); min-height: calc(51px + var(--safe-top)); }
.identity { display: flex; align-items: center; gap: 9px; min-width: 0; }
.header-actions { display: flex; gap: 4px; }

.transcript {
  flex: 1;
  overflow: auto;
  padding: 24px max(16px, calc((100% - 690px) / 2)) 12px;
  outline: none;
  -webkit-overflow-scrolling: touch;
}
.row { display: flex; margin: 0 0 18px; }
.row.user { justify-content: flex-end; }
.bubble {
  max-width: min(88%, 640px);
  padding: 8px 12px;
  border-radius: var(--radius);
  background: var(--bubble);
  overflow-wrap: anywhere;
  white-space: pre-wrap;
  line-height: 1.45;
}
.row.user .bubble { background: var(--user); }
.activity {
  margin: 0 0 10px;
  color: var(--text-3);
  font-size: 12px;
}
.plan {
  margin: 0 0 16px;
  padding: 10px 12px;
  border: 1px solid var(--stroke);
  border-radius: 12px;
  font-size: 13px;
}
.plan li { margin: 4px 0; }
.plan .done { color: var(--text-3); text-decoration: line-through; }
.typing { display: flex; gap: 4px; padding: 10px 12px; width: max-content; background: var(--bubble); border-radius: 14px; }
.typing i { width: 5px; height: 5px; border-radius: 50%; background: #9ba392; animation: blink 1s infinite; }
.typing i:nth-child(2) { animation-delay: .15s; }
.typing i:nth-child(3) { animation-delay: .3s; }
@keyframes blink { 50% { opacity: .35; } }

.question-card {
  margin: 0 max(16px, calc((100% - 690px) / 2)) 8px;
  padding: 12px;
  border: 1px solid var(--stroke);
  border-radius: 14px;
  background: color-mix(in srgb, var(--accent) 8%, var(--bg));
}
.question-card p { margin: 0 0 8px; }
.options { display: flex; flex-wrap: wrap; gap: 8px; }
.options button {
  min-height: 44px;
  padding: 8px 12px;
  border: 0;
  border-radius: 999px;
  background: var(--accent);
  color: #141414;
  font-weight: 600;
}

.composer {
  padding: 8px max(16px, calc((100% - 700px) / 2)) calc(12px + var(--safe-bottom));
}
.prompt-shell {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 9px;
  background: color-mix(in srgb, #f0f0f0 6%, var(--bg));
  border: 1px solid var(--stroke);
  border-radius: 16px;
}
#prompt {
  flex: 1;
  min-height: 44px;
  max-height: 30vh;
  resize: none;
  background: transparent;
  border: 0;
  outline: none;
  line-height: 1.4;
  color: var(--text);
}
#prompt::placeholder { color: var(--text-3); }
.send-btn {
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 999px;
  background: var(--text);
  color: var(--bg);
  font-size: 18px;
  line-height: 1;
}
.send-btn:disabled { opacity: .35; }

.icon-btn, .text-btn {
  min-height: 36px;
  padding: 6px 10px;
  background: transparent;
  border: 0;
  border-radius: 10px;
  color: var(--text-2);
}
.icon-btn:hover, .text-btn:hover { background: var(--fill); }
.text-btn.danger { color: var(--danger); }
.hidden { display: none !important; }

.computer-pane {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  flex-direction: column;
  background: #000;
  padding-top: var(--safe-top);
}
.computer-pane[hidden] { display: none !important; }
.computer-header { background: var(--chrome); }
.computer-pane iframe { flex: 1; width: 100%; border: 0; background: #111; }
.computer-status { margin: 0; padding: 8px 12px calc(8px + var(--safe-bottom)); color: var(--text-3); font-size: 12px; background: var(--chrome); }

.tabbar { display: none; }
.menu-btn { display: none; }
.backdrop {
  position: fixed;
  inset: 0;
  z-index: 8;
  background: #0008;
}

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    z-index: 9;
    inset: 0 auto 0 0;
    width: min(86vw, 320px);
    transform: translateX(-105%);
    transition: transform .22s cubic-bezier(.22, 1, .36, 1);
  }
  .sidebar.open { transform: none; }
  .menu-btn { display: inline-flex; }
  .tabbar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 6;
    padding: 6px 8px calc(6px + var(--safe-bottom));
    background: color-mix(in srgb, var(--chrome) 92%, transparent);
    backdrop-filter: blur(16px);
    border-top: 1px solid var(--stroke);
  }
  .tab {
    min-height: 44px;
    border: 0;
    border-radius: 12px;
    background: transparent;
    color: var(--text-3);
    font-weight: 600;
  }
  .tab.active { color: var(--text); background: var(--fill); }
  .composer { padding-bottom: calc(64px + var(--safe-bottom)); }
  .header-actions #computer-btn { display: none; }
}