:root {
  color-scheme: light dark;

  --bg-canvas-light: #f4f6fb;
  --bg-canvas-dark: #0b101b;
  --bg-surface-light: #ffffff;
  --bg-surface-dark: #131b2e;
  --bg-subtle-light: #eef2f9;
  --bg-subtle-dark: #1c2740;
  --text-main-light: #0f172a;
  --text-main-dark: #f1f5f9;
  --text-muted-light: #475569;
  --text-muted-dark: #94a3b8;
  --border-light: #dbe3f0;
  --border-dark: #263452;
  --brand-light: #1d4ed8;
  --brand-dark: #60a5fa;
  --brand-on-light: #ffffff;
  --brand-on-dark: #081226;
  --self-bubble-light: #dbeafe;
  --self-bubble-dark: #1e3a8a;
  --warn-bg-light: #fef2f2;
  --warn-bg-dark: #3b1219;
  --warn-text-light: #b91c1c;
  --warn-text-dark: #fca5a5;
  --ok-bg-light: #eff6ff;
  --ok-bg-dark: #172554;
  --scroll-thumb-light: #94a3b8;
  --scroll-thumb-dark: #475569;
  --scroll-track-light: #e2e8f0;
  --scroll-track-dark: #0f172a;

  --bg-canvas: var(--bg-canvas-light);
  --bg-surface: var(--bg-surface-light);
  --bg-subtle: var(--bg-subtle-light);
  --text-main: var(--text-main-light);
  --text-muted: var(--text-muted-light);
  --border-color: var(--border-light);
  --brand: var(--brand-light);
  --brand-on: var(--brand-on-light);
  --self-bubble: var(--self-bubble-light);
  --warn-bg: var(--warn-bg-light);
  --warn-text: var(--warn-text-light);
  --ok-bg: var(--ok-bg-light);
  --scrollbar-thumb: var(--scroll-thumb-light);
  --scrollbar-track: var(--scroll-track-light);

  @media (prefers-color-scheme: dark) {
    --bg-canvas: var(--bg-canvas-dark);
    --bg-surface: var(--bg-surface-dark);
    --bg-subtle: var(--bg-subtle-dark);
    --text-main: var(--text-main-dark);
    --text-muted: var(--text-muted-dark);
    --border-color: var(--border-dark);
    --brand: var(--brand-dark);
    --brand-on: var(--brand-on-dark);
    --self-bubble: var(--self-bubble-dark);
    --warn-bg: var(--warn-bg-dark);
    --warn-text: var(--warn-text-dark);
    --ok-bg: var(--ok-bg-dark);
    --scrollbar-thumb: var(--scroll-thumb-dark);
    --scrollbar-track: var(--scroll-track-dark);
  }

  @supports (color: light-dark(white, black)) {
    --bg-canvas: light-dark(var(--bg-canvas-light), var(--bg-canvas-dark));
    --bg-surface: light-dark(var(--bg-surface-light), var(--bg-surface-dark));
    --bg-subtle: light-dark(var(--bg-subtle-light), var(--bg-subtle-dark));
    --text-main: light-dark(var(--text-main-light), var(--text-main-dark));
    --text-muted: light-dark(var(--text-muted-light), var(--text-muted-dark));
    --border-color: light-dark(var(--border-light), var(--border-dark));
    --brand: light-dark(var(--brand-light), var(--brand-dark));
    --brand-on: light-dark(var(--brand-on-light), var(--brand-on-dark));
    --self-bubble: light-dark(var(--self-bubble-light), var(--self-bubble-dark));
    --warn-bg: light-dark(var(--warn-bg-light), var(--warn-bg-dark));
    --warn-text: light-dark(var(--warn-text-light), var(--warn-text-dark));
    --ok-bg: light-dark(var(--ok-bg-light), var(--ok-bg-dark));
    --scrollbar-thumb: light-dark(var(--scroll-thumb-light), var(--scroll-thumb-dark));
    --scrollbar-track: light-dark(var(--scroll-track-light), var(--scroll-track-dark));
  }

  accent-color: var(--brand);
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

@supports not (scrollbar-color: auto) {
  .scroller::-webkit-scrollbar {
    width: 8px;
    height: 8px;
  }
  .scroller::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
  }
  .scroller::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg-canvas);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

pre,
code {
  color-scheme: dark;
  accent-color: var(--brand);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

[hidden] {
  display: none !important;
}

.login-screen {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 20px;
}

.login-card {
  width: 100%;
  max-width: 400px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px;
}

.login-card h1 {
  margin: 10px 0 6px;
  font-size: 1.35rem;
}

.brand-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--ok-bg);
  color: var(--brand);
}

.app-shell {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-surface);
  border-left: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
}

.topbar {
  padding: calc(8px + env(safe-area-inset-top)) 12px 8px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-surface);
}

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

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #22c55e;
  flex-shrink: 0;
}

.status-dot.offline {
  background: #ef4444;
}

.thread-selector-wrap {
  flex: 1;
  min-width: 0;
}

#thread-select {
  width: 100%;
  padding: 7px 10px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-subtle);
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.92rem;
}

.ro-pill {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--ok-bg);
  color: var(--brand);
  letter-spacing: 0.03em;
}

.pacing-banner {
  margin-top: 7px;
  padding: 7px 10px;
  border-radius: 10px;
  font-size: 0.82rem;
  line-height: 1.35;
  background: var(--ok-bg);
}

.pacing-banner.warning {
  background: var(--warn-bg);
  color: var(--warn-text);
  font-weight: 600;
}

.main-panels {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.tab-panel {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.scroller {
  overflow-y: auto;
  scrollbar-width: thin;
}

.quick-chips {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-color);
}

.chip {
  white-space: nowrap;
  border: 1px solid var(--border-color);
  background: var(--bg-subtle);
  color: var(--text-main);
  padding: 6px 11px;
  border-radius: 999px;
  font-size: 0.8rem;
  cursor: pointer;
}

.coach-messages,
.zalo-feed {
  flex: 1;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--bg-canvas);
}

.msg-card {
  max-width: 90%;
  padding: 10px 13px;
  border-radius: 14px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  line-height: 1.48;
  font-size: 0.92rem;
  word-break: break-word;
}

.msg-card.self {
  align-self: flex-end;
  background: var(--self-bubble);
}

.msg-card.partner {
  align-self: flex-start;
}

.msg-meta {
  font-size: 0.73rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.quote-box {
  font-size: 0.8rem;
  padding: 5px 8px;
  margin-bottom: 6px;
  border-left: 3px solid var(--brand);
  background: var(--bg-subtle);
  border-radius: 6px;
  color: var(--text-muted);
}

.reaction-row {
  margin-top: 5px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.composer {
  padding: 10px 12px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-surface);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

textarea,
input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 9px 11px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-subtle);
  color: var(--text-main);
  font-size: 0.94rem;
  font-family: inherit;
}

.composer-actions,
.save-bar,
.panel-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.panel-toolbar {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-color);
}

.btn-primary {
  background: var(--brand);
  color: var(--brand-on);
  border: none;
  border-radius: 10px;
  padding: 9px 16px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: wait;
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 0.8rem;
  cursor: pointer;
}

.card {
  margin: 12px;
  padding: 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card h2 {
  margin: 0 0 4px;
  font-size: 1.05rem;
}

.card label {
  font-size: 0.82rem;
  font-weight: 600;
  margin-top: 4px;
}

.endpoint-box {
  padding: 10px;
  background: var(--bg-subtle);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

.copy-row code {
  flex: 1;
  padding: 6px 8px;
  border-radius: 6px;
  background: #0f172a;
  color: #e2e8f0;
  font-size: 0.8rem;
  overflow-x: auto;
}

.bottom-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--border-color);
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--bg-surface);
}

.nav-btn {
  border: none;
  background: transparent;
  color: var(--text-muted);
  padding: 11px 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.nav-btn.active {
  color: var(--brand);
  box-shadow: inset 0 2px 0 var(--brand);
}

.badge {
  display: inline-block;
  background: #ef4444;
  color: #ffffff;
  font-size: 0.7rem;
  padding: 1px 6px;
  border-radius: 999px;
}

.muted {
  color: var(--text-muted);
  font-size: 0.84rem;
  margin: 0;
}

.error-text {
  color: var(--warn-text);
  font-size: 0.84rem;
  margin: 6px 0;
}

.coach-md p {
  margin: 0 0 8px;
}
.coach-md p:last-child {
  margin-bottom: 0;
}
.coach-md ul,
.coach-md ol {
  margin: 4px 0 8px 18px;
  padding: 0;
}
.coach-md blockquote {
  margin: 6px 0;
  padding: 6px 10px;
  border-left: 3px solid var(--brand);
  background: var(--bg-subtle);
  border-radius: 6px;
}