/* Reset e variabili CSS */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --background-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Layout principale */
.container {
    display: grid;
    grid-template-columns: 1fr 300px;
    grid-template-rows: auto 1fr;
    grid-template-areas: 
        "header header"
        "main sidebar";
    min-height: 100vh;
    max-width: 1400px;
    margin: 0 auto;
    gap: 1.5rem;
    padding: 1rem;
}

/* Header */
.header {
    grid-area: header;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.header-content {
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.logo-image {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--accent-color);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.logo i {
    font-size: 2.5rem;
    color: var(--accent-color);
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 400;
}

/* Main Content */
.main-content {
    grid-area: main;
    display: flex;
    flex-direction: column;
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

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

/* Welcome Section */
.welcome-section {
    padding: 3rem 2rem;
    text-align: center;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.welcome-content {
    max-width: 800px;
    margin: 0 auto;
}

.welcome-icon {
    margin-bottom: 1.5rem;
}

.welcome-icon i {
    font-size: 4rem;
    color: var(--primary-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.welcome-content h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.welcome-content p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Quick Topics */
.quick-topics {
    margin-bottom: 2rem;
}

.quick-topics h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.topic-btn {
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.topic-btn:hover {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Example Questions */
.example-questions h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.example-btn {
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    padding: 1rem;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.example-btn:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.example-btn i {
    font-size: 1.2rem;
    color: var(--primary-color);
    transition: color 0.3s ease;
}

.example-btn:hover i {
    color: white;
}

/* Chat Messages */
.chat-messages {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
    max-height: 500px;
}

.message {
    margin-bottom: 1.5rem;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    text-align: right;
}

.message.bot {
    text-align: left;
}

.message-content {
    display: inline-block;
    max-width: 80%;
    padding: 1rem 1.25rem;
    border-radius: var(--radius-lg);
    position: relative;
}

.message.user .message-content {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border-bottom-right-radius: var(--radius-sm);
}

.message.bot .message-content {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-bottom-left-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

.message-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.confidence-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 500;
    margin-left: 0.5rem;
}

.confidence-high {
    background: var(--accent-color);
    color: white;
}

.confidence-medium {
    background: var(--warning-color);
    color: white;
}

.confidence-low {
    background: var(--danger-color);
    color: white;
}

/* Loading Indicator */
.loading-indicator {
    padding: 1.5rem;
    text-align: center;
}

.typing-animation {
    display: inline-flex;
    gap: 0.25rem;
    margin-bottom: 0.5rem;
}

.typing-animation span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-color);
    animation: typing 1.4s infinite ease-in-out;
}

.typing-animation span:nth-child(1) { animation-delay: -0.32s; }
.typing-animation span:nth-child(2) { animation-delay: -0.16s; }

@keyframes typing {
    0%, 80%, 100% {
        transform: scale(0);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Input Area */
.input-area {
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    background: var(--surface-color);
}

.input-container {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

#messageInput {
    flex: 1;
    padding: 0.875rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    transition: all 0.2s ease;
    background: var(--surface-color);
}

#messageInput:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

#sendButton {
    padding: 0.875rem 1.25rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1rem;
    min-width: 60px;
}

#sendButton:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

#sendButton:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.input-footer {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: center;
}

.input-footer i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

.copyright {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Sidebar */
.sidebar {
    grid-area: sidebar;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.info-card {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.info-card h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.info-card h3 i {
    color: var(--primary-color);
}

.info-card ul {
    list-style: none;
}

.info-card li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.info-card li:last-child {
    border-bottom: none;
}

.info-card li strong {
    color: var(--text-primary);
}

.info-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        grid-template-columns: 1fr;
        grid-template-areas: 
            "header"
            "main"
            "sidebar";
    }
    
    .sidebar {
        flex-direction: row;
        overflow-x: auto;
    }
    
    .info-card {
        min-width: 250px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0.5rem;
        gap: 1rem;
    }
    
    .header {
        padding: 1.5rem;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .welcome-section {
        padding: 2rem 1rem;
    }
    
    .examples {
        grid-template-columns: 1fr;
    }
    
    .topics-grid {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        flex-direction: column;
    }
    
    .message-content {
        max-width: 90%;
    }
}

@media (max-width: 480px) {
    .logo {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .input-container {
        flex-direction: column;
    }
    
    #sendButton {
        align-self: stretch;
    }
}