/* Use 100dvh on supported browsers; falls back to 100vh on older. */
#app {
  display: flex;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

/* ── Back-to-devinfo link (top-left, all viewports) ── */
.back-link {
  position: fixed;
  top: 10px;
  left: 14px;
  z-index: 200;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: rgba(20, 20, 20, 0.85);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.back-link:hover {
  color: var(--text-primary);
  border-color: var(--accent);
  background: rgba(20, 20, 20, 0.95);
}

/* ── Hamburger (mobile only) ── */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 10px;
  right: 14px;
  z-index: 200;
  width: 40px;
  height: 40px;
  background: rgba(20, 20, 20, 0.85);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid var(--border);
  border-radius: 8px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  cursor: pointer;
}
.sidebar-toggle .hamburger-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}
.sidebar-toggle[aria-expanded="true"] .hamburger-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.sidebar-toggle[aria-expanded="true"] .hamburger-bar:nth-child(2) {
  opacity: 0;
}
.sidebar-toggle[aria-expanded="true"] .hamburger-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.sidebar-scrim {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 90;
}
.sidebar-scrim.visible {
  display: block;
}

/* ── Sidebar ── */
#sidebar {
  width: 220px;
  min-width: 220px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 56px 12px 16px;
  gap: 8px;
}

.sidebar-header {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 8px 16px;
}

.logo {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo-accent { color: var(--accent); }

.version {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.nav-list {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-btn {
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  /* Larger tap target for mobile */
  min-height: 40px;
}

.nav-btn:hover { background: var(--bg-hover); color: var(--text-primary); }
.nav-btn.active { background: var(--accent-dim); color: var(--accent); font-weight: 500; }

.sidebar-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 8px 4px;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.health-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.health-dot.online { background: var(--success); box-shadow: 0 0 6px var(--success); }
.health-dot.degraded { background: var(--warning); box-shadow: 0 0 6px var(--warning); }
.health-dot.offline { background: var(--error); }

/* ── Main content ── */
#main-content {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  /* Reserve space below the fixed back-link / hamburger so chat header isn't covered */
  padding-top: 0;
}

/* ── Chat view ── */
.chat-view {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
}

.chat-header {
  padding: 12px 20px 12px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-secondary);
  flex-wrap: wrap;
}

.chat-header select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-size: 0.85rem;
  color: var(--text-primary);
  outline: none;
  min-height: 36px;
  max-width: 100%;
}

.chat-header select:focus { border-color: var(--accent); }

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 0;
  -webkit-overflow-scrolling: touch;
}

.message {
  max-width: 80%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.message.user {
  align-self: flex-end;
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.message.assistant {
  align-self: flex-start;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.message.assistant pre {
  background: var(--bg-primary);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 8px 0;
  font-size: 0.82rem;
}

.message.assistant code {
  font-family: var(--font-mono);
  font-size: 0.85em;
}

.message .meta {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 6px;
  font-family: var(--font-mono);
}

.message.user .meta { color: rgba(255,255,255,0.6); }

.chat-input-area {
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom)) 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  display: flex;
  gap: 10px;
}

.chat-input-area textarea {
  flex: 1;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  color: var(--text-primary);
  resize: none;
  min-height: 44px;
  max-height: 200px;
  font-size: 1rem; /* 1rem prevents iOS auto-zoom on focus */
  outline: none;
  transition: border-color var(--transition);
}

.chat-input-area textarea:focus { border-color: var(--accent); }

.chat-input-area button.send-btn {
  background: var(--accent);
  color: #fff;
  padding: 0 18px;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9rem;
  transition: background var(--transition);
  min-height: 44px;
  min-width: 64px;
}

.chat-input-area button.send-btn:hover { background: var(--accent-hover); }
.chat-input-area button.send-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── Models view ── */
.models-view {
  padding: 24px;
}

.models-view h2 { font-size: 1.2rem; margin-bottom: 16px; }

.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}

.model-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  transition: border-color var(--transition);
}

.model-card:hover { border-color: var(--accent); }
.model-card .model-id { font-family: var(--font-mono); font-size: 0.85rem; font-weight: 600; word-break: break-all; }
.model-card .model-owner { font-size: 0.75rem; color: var(--text-muted); margin-top: 4px; }

/* ── Stats view ── */
.stats-view { padding: 24px; }
.stats-view h2 { font-size: 1.2rem; margin-bottom: 16px; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
}

.stat-card .stat-value { font-size: 1.8rem; font-weight: 700; font-family: var(--font-mono); }
.stat-card .stat-label { font-size: 0.75rem; color: var(--text-muted); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.05em; }

.recent-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.recent-table th {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
}

.recent-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
}

.recent-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* ── Settings view ── */
.settings-view { padding: 24px; max-width: 600px; }
.settings-view h2 { font-size: 1.2rem; margin-bottom: 16px; }

.setting-group {
  margin-bottom: 20px;
}

.setting-group label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.setting-group input {
  width: 100%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 1rem; /* prevents iOS zoom */
  outline: none;
}

.setting-group input:focus { border-color: var(--accent); }

.setting-group .hint {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.btn-save {
  background: var(--accent);
  color: #fff;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.9rem;
  transition: background var(--transition);
  min-height: 40px;
}

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

/* ── Contact view ── */
.contact-view { padding: 24px; max-width: 600px; }
.contact-view h2 { font-size: 1.2rem; margin-bottom: 8px; }
.contact-view .lede { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 20px; line-height: 1.6; }
.contact-view .alt-contact {
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.contact-view .alt-contact a { color: var(--accent); }
.contact-view textarea {
  width: 100%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--text-primary);
  font: inherit;
  font-size: 1rem;
  outline: none;
  resize: vertical;
  min-height: 120px;
}
.contact-view textarea:focus { border-color: var(--accent); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar-toggle {
    display: flex;
  }
  .back-link {
    /* Stay at top-left but slightly smaller on mobile */
    font-size: 0.72rem;
    padding: 6px 10px;
  }
  #sidebar {
    position: fixed;
    left: -260px;
    top: 0;
    bottom: 0;
    width: 240px;
    z-index: 100;
    transition: left var(--transition);
    box-shadow: var(--shadow-md);
    padding-top: 56px;
  }
  #sidebar.open { left: 0; }
  .message { max-width: 95%; }
  .chat-header { padding-top: 56px; padding-left: 16px; padding-right: 16px; }
  .models-view, .stats-view, .settings-view, .contact-view { padding: 56px 16px 24px; }
}