/* Shared app shell for the chat/lesson page (templates/index.html) and the
   programme planner (templates/programmes.html): design tokens, sidebar,
   sign-in footer, top bar and the tool tabs. Page-specific styles live in
   each page. */

:root {
  --bg: #f5f4f0;
  --surface: #ffffff;
  --sidebar-bg: #faf9f6;
  --border: #e5e3dc;
  --border-strong: #d6d3ca;
  --text: #22272b;
  --muted: #6d7378;
  --faint: #9aa0a6;
  --accent: #1f6e5a;
  --accent-hover: #185846;
  --accent-soft: #e7f1ed;
  --accent-border: #c3ddd4;
  --danger: #b3382f;
  --danger-soft: #fdecea;
  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(30, 35, 40, 0.06);
  --shadow-md: 0 4px 16px rgba(30, 35, 40, 0.10);
}

.app {
  display: flex;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

.sidebar {
  width: 272px;
  min-width: 272px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: margin-left 0.25s ease;
  z-index: 60;
}

.sidebar.collapsed {
  margin-left: -272px;
}

.sidebar-top {
  padding: 14px 14px 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 2px 4px;
}

.brand img {
  width: 30px;
  height: 30px;
}

.brand .brand-name {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand .brand-sub {
  font-size: 0.72rem;
  color: var(--muted);
  display: block;
  margin-top: -2px;
}

.new-chat-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 9px 12px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.new-chat-btn:hover {
  background: var(--accent-hover);
}

.new-chat-btn svg {
  width: 15px;
  height: 15px;
  fill: currentColor;
}

.sessions-list {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 4px 8px 12px;
  min-height: 0;
}

.session-group-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--faint);
  padding: 14px 8px 5px;
}

.session-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 8px;
  border-radius: 8px;
  cursor: pointer;
  color: var(--text);
  position: relative;
}

.session-item:hover {
  background: #efede7;
}

.session-item.active {
  background: var(--accent-soft);
}

.session-mode-icon {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  color: var(--faint);
  display: flex;
  align-items: center;
}

.session-item.active .session-mode-icon {
  color: var(--accent);
}

.session-mode-icon svg {
  width: 15px;
  height: 15px;
  fill: currentColor;
}

.session-body {
  flex: 1;
  min-width: 0;
}

.session-title {
  font-size: 0.86rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.session-time {
  font-size: 0.72rem;
  color: var(--faint);
  margin-top: 1px;
}

.session-title-input {
  width: 100%;
  font: inherit;
  font-size: 0.86rem;
  padding: 2px 4px;
  border: 1px solid var(--accent);
  border-radius: 5px;
  outline: none;
  background: #fff;
}

.session-actions {
  display: none;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
}

.session-item:hover .session-actions {
  display: flex;
}

.session-action-btn {
  width: 24px;
  height: 24px;
  border: none;
  background: transparent;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
}

.session-action-btn svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.session-action-btn:hover {
  background: #e2dfd7;
  color: var(--text);
}

.session-action-btn.delete:hover {
  background: var(--danger-soft);
  color: var(--danger);
}

.sessions-empty {
  padding: 24px 12px;
  text-align: center;
  color: var(--faint);
  font-size: 0.85rem;
}

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding: 12px 14px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
}

.user-meta {
  flex: 1;
  min-width: 0;
}

.user-name {
  font-weight: 600;
  font-size: 0.85rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-provider {
  font-size: 0.72rem;
  color: var(--muted);
}

.user-actions {
  display: flex;
  gap: 6px;
  margin-top: 10px;
}

.user-link {
  flex: 1;
  text-align: center;
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 600;
}

.user-link:hover {
  border-color: var(--border-strong);
  background: #f4f2ec;
}

.auth-buttons {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.auth-btn {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.82rem;
  cursor: pointer;
}

.auth-btn:hover {
  background: #f4f2ec;
  border-color: var(--border-strong);
}

.auth-btn.facebook {
  background: #1877f2;
  border-color: #1877f2;
  color: white;
}

.auth-btn.facebook:hover {
  background: #166fe0;
}

.auth-btn.dev {
  background: var(--accent-soft);
  border-color: var(--accent-border);
  color: var(--accent);
}

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

.topbar {
  height: 54px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 14px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.icon-btn {
  width: 34px;
  height: 34px;
  border: none;
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  flex-shrink: 0;
}

.icon-btn:hover {
  background: #f0eee8;
  color: var(--text);
}

.icon-btn svg {
  width: 19px;
  height: 19px;
  fill: currentColor;
}

.topbar-brand {
  display: none;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.95rem;
}

.topbar-brand img {
  width: 24px;
  height: 24px;
}

.sidebar.collapsed~.main .topbar-brand,
        .app.sidebar-collapsed .topbar-brand {
  display: flex;
}

.mode-switch {
  display: inline-flex;
  background: #edebe4;
  border-radius: 10px;
  padding: 3px;
  margin: 0 auto;
}

.mode-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px 16px;
  border: none;
  border-radius: 8px;
  background: transparent;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.15s;
}

.mode-btn svg {
  width: 15px;
  height: 15px;
  fill: currentColor;
}

.mode-btn.active {
  background: var(--surface);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 34px;
  justify-content: flex-end;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(20, 24, 28, 0.45);
  z-index: 55;
}

.sidebar-overlay.active {
  display: block;
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100dvh;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    margin-left: 0 !important;
    box-shadow: var(--shadow-md);
  }
  .sidebar.mobile-open {
    transform: translateX(0);
  }
  .topbar-brand {
    display: flex !important;
  }
  .mode-btn {
    padding: 6px 10px;
  }
  .mode-btn .mode-label {
    display: none;
  }
}

/* Tabs may be links (the programme planner is a separate page) */
a.mode-btn {
  text-decoration: none;
}

/* Three tabs need more room than two: keep labels on one line, and show
   icons only on medium-width screens */
.mode-btn {
  white-space: nowrap;
}
@media (max-width: 900px) {
  .mode-btn {
    padding: 6px 10px;
  }
  .mode-btn .mode-label {
    display: none;
  }
}