:root,
[data-theme="light"] {
  --bg-primary: #f5f5f5;
  --bg-secondary: #ffffff;
  --bg-card: #e8e8e8;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --border: #d4d4d4;
  --primary: #FF6B35;
  --primary-hover: #E55A2B;
  --primary-glow: rgba(255, 107, 53, 0.15);
  --success: #22c55e;
  --success-glow: rgba(34, 197, 94, 0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-full: 24px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
}

[data-theme="dark"] {
  --bg-primary: #000000;
  --bg-secondary: #111111;
  --bg-card: #1a1a1a;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --border: #333333;
  --primary: #FF6B35;
  --primary-hover: #E55A2B;
  --primary-glow: rgba(255, 107, 53, 0.2);
  --success: #22c55e;
  --success-glow: rgba(34, 197, 94, 0.2);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition-normal), color var(--transition-normal);
}

#login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}
.login-container { text-align: center; }
.login-logo {
  width: 120px; height: 120px;
  border-radius: 28px;
  margin: 0 auto 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.login-logo .logo-img {
  width: 100%; height: 100%; object-fit: contain;
}
#login-page h1 { font-size: 1.75rem; margin-bottom: 0.5rem; }
#login-page p { color: var(--text-secondary); margin-bottom: 2rem; }
#login-page form {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: var(--radius);
  width: 360px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.form-group { margin-bottom: 1rem; text-align: left; }
.form-group label { display: block; font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 0.5rem; }
#login-page input {
  width: 100%; padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-family);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
#login-page input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}
#login-page button {
  width: 100%; padding: 12px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: background var(--transition-fast), transform 0.1s;
}
#login-page button:hover { background: var(--primary-hover); }
#login-page button:active { transform: scale(0.98); }
#login-error { color: #ef4444; margin-top: 1rem; font-size: 0.875rem; text-align: center; }

#composer-page { display: none; min-height: 100vh; }
.composer-back-btn {
  position: fixed; top: 20px; left: 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 8px 16px; border-radius: var(--radius-full);
  font-size: 0.875rem; cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-family);
  z-index: 10;
}
.composer-back-btn:hover {
  color: var(--text-primary);
  border-color: var(--primary);
  background: rgba(255, 107, 53, 0.06);
}
.composer-top-controls {
  position: fixed; top: 20px; right: 20px;
  display: flex; align-items: center; gap: 8px;
  z-index: 10;
}
.theme-toggle {
  width: 40px; height: 40px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 1.15rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition-fast);
}
.theme-toggle:hover {
  border-color: var(--primary);
  color: var(--text-primary);
}
.lang-toggle {
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.lang-toggle:hover {
  border-color: var(--primary);
}
.composer-container {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: 100vh; padding: 40px 24px;
  max-width: 680px; margin: 0 auto;
  animation: fadeInUp 0.5s ease both;
}
.composer-logo {
  display: inline-block;
  width: 100px; height: 100px;
  border-radius: 24px;
  margin-bottom: 1.5rem;
  box-shadow: 0 12px 36px rgba(255, 107, 53, 0.3);
  overflow: hidden;
}
.composer-logo .logo-img {
  width: 100%; height: 100%; object-fit: contain;
}
.composer-heading {
  font-size: 1.75rem; font-weight: 700; margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}
.composer-subhead {
  color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 1rem;
}
.composer-notice {
  display: flex; align-items: flex-start; gap: 8px;
  width: 100%;
  padding: 12px 16px;
  margin-bottom: 1.5rem;
  border-radius: var(--radius-sm);
  background: #FFF3E0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: #8B4513;
  cursor: pointer;
  text-decoration: none;
  border: 1px solid #FFB74D;
  box-shadow: 0 2px 8px rgba(255, 152, 0, 0.15);
}
.composer-notice .notice-icon {
  flex-shrink: 0;
  font-size: 1rem;
  line-height: 1.6;
}
.composer-input-wrap {
  width: 100%; margin-bottom: 2rem;
  position: relative;
}
#prompt-input {
  width: 100%; padding: 20px 24px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 1.05rem; line-height: 1.6;
  font-family: var(--font-family);
  resize: vertical; min-height: 80px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
#prompt-input::placeholder { color: var(--text-secondary); opacity: 0.6; }
#prompt-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow), 0 8px 32px rgba(255, 107, 53, 0.08);
}
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  width: 100%; margin-bottom: 2rem;
}
.scenario-card {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 16px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.scenario-card:hover {
  border-color: var(--primary);
  background: rgba(255, 107, 53, 0.06);
  transform: translateY(-2px);
}
.scenario-card.selected {
  border-color: var(--primary);
  background: rgba(255, 107, 53, 0.1);
  box-shadow: 0 0 0 1px var(--primary);
}
.scenario-emoji { font-size: 1.5rem; margin-bottom: 4px; }
.scenario-label { font-size: 0.9rem; font-weight: 600; color: var(--text-primary); }
.scenario-desc { font-size: 0.75rem; color: var(--text-secondary); text-align: center; line-height: 1.3; }
.composer-submit {
  padding: 14px 48px;
  border: none;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
  color: #fff;
  font-size: 1rem; font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition-fast), transform 0.1s;
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.3);
}
.composer-submit:hover { opacity: 0.9; transform: translateY(-1px); }
.composer-submit:active { transform: scale(0.98); }
.composer-submit:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

@media (max-width: 640px) {
  .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
  .composer-heading { font-size: 1.4rem; }
}

#main-page { display: none; height: 100vh; }
.app-layout { display: flex; height: 100%; }

#sidebar {
  width: 280px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}
.sidebar-header { padding: 1.25rem; border-bottom: 1px solid var(--border); }
.sidebar-logo { display: flex; align-items: center; gap: 0.75rem; }
.sidebar-logo-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.sidebar-logo-icon .logo-img {
  width: 100%; height: 100%; object-fit: contain;
}
.sidebar-logo-text { font-weight: 600; font-size: 1.1rem; }

#new-chat {
  width: 100%; padding: 12px;
  margin: 1rem 0;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  font-size: 0.9rem;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}
#new-chat:hover { background: rgba(255, 107, 53, 0.1); border-color: var(--primary); }

#sidebar h2 {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
  padding: 0 12px;
}
#session-list { list-style: none; flex: 1; overflow-y: auto; padding: 0 8px; }
#session-list li {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  margin-bottom: 4px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
#session-list li:hover { background: var(--bg-card); color: var(--text-primary); }
#session-list li.active { background: var(--primary); color: #fff; font-weight: 500; }

.sidebar-bottom {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
#theme-btn-sidebar {
  width: 36px; height: 36px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: transparent;
  color: var(--text-secondary);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
#theme-btn-sidebar:hover {
  border-color: var(--primary);
  color: var(--text-primary);
}
#logout {
  padding: 8px 16px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.8rem;
  transition: color var(--transition-fast);
}
#logout:hover { color: #ef4444; }

#account-link {
  padding: 8px 16px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.8rem;
  transition: color var(--transition-fast);
}
#account-link:hover { color: var(--primary); }

.form-switch {
  text-align: center;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.form-switch a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}
.form-switch a:hover { text-decoration: underline; }

#app-toast {
  position: fixed;
  bottom: 32px;
  right: 32px;
  padding: 12px 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.2s, transform 0.2s;
  z-index: 1500;
  max-width: 360px;
  pointer-events: none;
}
#app-toast.toast--show { opacity: 1; transform: translateY(0); }
#app-toast.toast--success { border-color: var(--success); }
#app-toast.toast--error { border-color: #ef4444; }
#app-toast.toast--warn { border-color: #f59e0b; }

#chat-area { flex: 1; display: flex; flex-direction: column; background: var(--bg-primary); }
#progress-bar {
  flex-shrink: 0;
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
  padding: 4px 1.25rem;
  min-height: 28px;
}
#messages { flex: 1; overflow-y: auto; padding: 1.5rem; }
.message {
  max-width: 720px;
  margin: 0 auto 1rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  line-height: 1.6;
  font-size: 0.9375rem;
  animation: fadeInUp 0.3s ease both;
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.message.user {
  background: var(--primary);
  color: #fff;
  border-bottom-right-radius: 4px;
  margin-left: auto;
  max-width: 70%;
  font-size: 0.875rem;
}
.message.assistant p { margin: 0; }
.message.assistant p + p { margin-top: 0.5em; }
.message.assistant ul, .message.assistant ol { margin: 0.25em 0; padding-left: 1.5em; }
.message.assistant li { margin: 0.15em 0; }
.message.assistant {
  background: var(--bg-secondary);
  border-bottom-left-radius: 4px;
  margin-right: auto;
}
.message.tool {
  background: var(--bg-card);
  font-size: 0.85rem;
  border-left: 3px solid var(--primary);
}

.progress-line {
  display: flex;
  align-items: baseline;
  gap: 5px;
  max-width: 720px;
  margin: 0 auto;
  padding: 2px 8px;
  font-size: 0.78rem;
  font-family: 'Fira Code', 'Cascadia Code', monospace;
  color: var(--text-secondary);
  border-left: 3px solid var(--primary);
  background: var(--primary-glow);
  border-radius: 0 4px 4px 0;
  animation: fadeInUp 0.2s ease both;
  opacity: 0.85;
}
.progress-line .progress-icon { font-size: 0.7rem; }
.progress-line .progress-tool { color: var(--primary); font-weight: 600; }



.tool-events-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
  padding: 8px 0;
  border-top: 1px solid var(--border);
}
.tool-events-container.collapsed {
  max-height: 80px;
  overflow: hidden;
  position: relative;
}
.tool-events-container.collapsed::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 40px;
  background: linear-gradient(transparent, var(--bg-primary));
}

.tool-event {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 10px;
  font-size: 0.8rem;
  min-width: 120px;
}
.tool-event:hover { border-color: var(--primary); }
.tool-event.expanded { border-color: var(--primary); }

.tool-event .tool-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: monospace;
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--primary-glow);
  color: var(--primary);
  border-left: 3px solid var(--primary);
  cursor: pointer;
  user-select: none;
}
.tool-event .tool-tag.completed {
  background: var(--success-glow, rgba(34,197,94,0.15));
  color: var(--success, #22c55e);
  border-left-color: var(--success, #22c55e);
}
.tool-event .tool-tag .tool-icon { font-size: 0.65rem; }

.tool-event .tool-result {
  display: none;
  font-size: 0.75rem;
  font-family: monospace;
  color: var(--text-secondary);
  padding: 4px 8px;
  border-left: 2px solid var(--primary);
  word-break: break-word;
  max-height: 200px;
  overflow-y: auto;
}
.tool-event.expanded .tool-result { display: block; }
.tool-event .tool-result-label {
  color: var(--primary);
  font-weight: 600;
  margin-right: 4px;
}
.tool-event .tool-expand-hint {
  font-size: 0.7rem;
  color: var(--primary);
  cursor: pointer;
  display: block;
}

.toggle-content-btn {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 10px;
  cursor: pointer;
  margin-top: 4px;
}

.assistant-text { line-height: 1.6; }
.assistant-text table { border-collapse: collapse; margin: 0.5rem 0; }
.assistant-text table th, .assistant-text table td { border: 1px solid var(--border); padding: 6px 10px; }

#input-area {
  padding: 1rem 1.5rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}
#input-area form {
  display: flex;
  gap: 0.75rem;
  max-width: 720px;
  margin: 0 auto;
}
#input-area input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-family);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
#input-area input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}
.send-btn {
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-full);
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast), transform 0.1s;
}
.send-btn:hover { background: var(--primary-hover); }
.send-btn:active { transform: scale(0.96); }
.send-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.typing-indicator { display: flex; gap: 4px; padding: 0.5rem; }
.typing-indicator span {
  width: 8px; height: 8px;
  background: var(--text-secondary);
  border-radius: 50%;
  animation: typing 1s infinite;
}
.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }
@keyframes typing {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.5; }
  30% { transform: translateY(-4px); opacity: 1; }
}

pre { background: var(--bg-card); padding: 1rem; border-radius: var(--radius-sm); overflow-x: auto; margin: 0.5rem 0; }
code { font-family: 'Fira Code', 'Cascadia Code', monospace; font-size: 0.875rem; }
p code { background: var(--bg-card); padding: 2px 6px; border-radius: 4px; }

.usage-display {
  padding: 6px 12px;
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  gap: 16px;
  justify-content: center;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}
.usage-display span { white-space: nowrap; }