:root {
  --color-primary: #4CAF50;
  --color-primary-dark: #388E3C;
  --color-accent: #FF9800;
  --color-bg: #F5F5F5;
  --color-surface: #FFFFFF;
  --color-text: #333333;
  --color-text-secondary: #666666;
  --color-danger: #E53935;
  --color-info: #2196F3;
  --radius: 16px;
  --radius-sm: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  height: 100%;
  overflow: hidden;
}

.app-container {
  max-width: 480px;
  margin: 0 auto;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  box-shadow: var(--shadow);
}

/* Header */
.header {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
  padding: 20px 16px;
  text-align: center;
  flex-shrink: 0;
}

.header h1 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 4px;
}

.header p {
  font-size: 13px;
  opacity: 0.9;
}

/* Main menu */
.menu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 24px 16px;
  flex: 1;
  overflow-y: auto;
}

.menu-card {
  background: var(--color-surface);
  border: 2px solid #E0E0E0;
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  text-decoration: none;
  color: var(--color-text);
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.menu-card:hover, .menu-card:active {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.menu-card .icon {
  font-size: 40px;
  line-height: 1;
}

.menu-card .title {
  font-size: 16px;
  font-weight: 600;
}

.menu-card .subtitle {
  font-size: 12px;
  color: var(--color-text-secondary);
}

/* Chat */
.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.message {
  max-width: 85%;
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 15px;
  line-height: 1.5;
  word-wrap: break-word;
}

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

.message.bot {
  align-self: flex-start;
  background: #F0F0F0;
  color: var(--color-text);
  border-bottom-left-radius: 4px;
}

.message.bot .sources {
  margin-top: 8px;
  font-size: 12px;
  color: var(--color-text-secondary);
  border-top: 1px solid #DDD;
  padding-top: 8px;
}

.message.bot .sources a {
  color: var(--color-primary-dark);
}

.message.disclaimer {
  align-self: center;
  background: #FFF3E0;
  border: 1px solid var(--color-accent);
  color: #E65100;
  font-size: 12px;
  max-width: 95%;
  text-align: center;
}

.message.emergency {
  align-self: center;
  background: #FFEBEE;
  border: 2px solid var(--color-danger);
  color: var(--color-danger);
  font-size: 14px;
  max-width: 95%;
  text-align: center;
}

/* Input */
.input-area {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid #E0E0E0;
  background: var(--color-surface);
  flex-shrink: 0;
}

.input-area input, .input-area textarea {
  flex: 1;
  border: 1px solid #DDD;
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 15px;
  font-family: inherit;
  outline: none;
}

.input-area input:focus, .input-area textarea:focus {
  border-color: var(--color-primary);
}

.input-area button {
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  flex-shrink: 0;
}

.input-area button:hover {
  background: var(--color-primary-dark);
}

.input-area button:disabled {
  background: #CCC;
  cursor: not-allowed;
}

/* Forms */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}

.form-group input, .form-group select {
  width: 100%;
  border: 1px solid #DDD;
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 15px;
  font-family: inherit;
  outline: none;
}

.form-group input:focus, .form-group select:focus {
  border-color: var(--color-primary);
}

.btn-primary {
  display: block;
  width: 100%;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
}

.btn-primary:disabled {
  background: #CCC;
  cursor: not-allowed;
}

.result-box {
  background: #E8F5E9;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.6;
  white-space: pre-wrap;
}

.result-box.error {
  background: #FFEBEE;
  border-color: var(--color-danger);
}

/* Navigation */
.nav-bar {
  display: flex;
  justify-content: space-around;
  padding: 8px 0;
  border-top: 1px solid #E0E0E0;
  background: var(--color-surface);
  flex-shrink: 0;
}

.nav-bar a {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 12px;
  text-align: center;
  padding: 4px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.nav-bar a.active, .nav-bar a:hover {
  color: var(--color-primary);
}

.nav-bar a .nav-icon {
  font-size: 22px;
}

/* Loading */
.loading {
  text-align: center;
  padding: 20px;
  color: var(--color-text-secondary);
  font-size: 14px;
}

.loading::after {
  content: "...";
  animation: dots 1.5s infinite;
}

@keyframes dots {
  0%, 20% { content: "."; }
  40% { content: ".."; }
  60%, 100% { content: "..."; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #CCC; border-radius: 2px; }

/* Responsive */
@media (max-width: 360px) {
  .menu-grid { grid-template-columns: 1fr; }
  .header h1 { font-size: 18px; }
}