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

:root {
    --primary: #1e40af;
    --primary-dark: #1e3a8a;
    --secondary: #7c3aed;
    --success: #059669;
    --danger: #dc2626;
    --warning: #d97706;
    --bg: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
}

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

/* HEADER */
.header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.logo-text h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-text p {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.status-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    border-radius: 8px;
    font-size: 0.875rem;
    color: var(--success);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* MAIN CONTAINER */
.container {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 2rem;
}

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

.card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-select, .form-input {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.875rem;
    background: var(--bg-card);
    color: var(--text-primary);
    transition: all 0.2s;
}

.form-select:focus, .form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.model-info {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    padding: 0.5rem;
    background: var(--bg);
    border-radius: 6px;
}

/* TEMPLATES */
.templates-grid {
    display: grid;
    gap: 0.75rem;
}

.template-btn {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.875rem;
}

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

.template-icon {
    display: inline-block;
    margin-right: 0.5rem;
}

/* STATS */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.stat-item {
    text-align: center;
    padding: 1rem;
    background: var(--bg);
    border-radius: 8px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    display: block;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* CHAT AREA */
.chat-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.chat-messages {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    min-height: 600px;
    max-height: 600px;
    overflow-y: auto;
    scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 10px;
}

.welcome {
    text-align: center;
    padding: 3rem 2rem;
}

.welcome-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    box-shadow: var(--shadow-lg);
}

.welcome h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.welcome p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

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

.feature {
    background: var(--bg);
    padding: 1.25rem;
    border-radius: 10px;
    border: 1px solid var(--border);
    text-align: center;
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.feature-title {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
}

/* MESSAGES */
.message {
    margin-bottom: 1.5rem;
    display: flex;
    gap: 1rem;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.25rem;
}

.message.user .message-avatar {
    background: linear-gradient(135deg, #10b981, #059669);
}

.message.assistant .message-avatar {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.message.system .message-avatar {
    background: linear-gradient(135deg, #f59e0b, #d97706);
}

.message-content {
    flex: 1;
}

.message-header {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.message-text {
    background: var(--bg);
    padding: 1rem;
    border-radius: 10px;
    border: 1px solid var(--border);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.message.assistant .message-text {
    background: #f0f9ff;
    border-color: #bfdbfe;
}

.message-code {
    background: #1e293b;
    color: #e2e8f0;
    padding: 1.5rem;
    border-radius: 10px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
    margin-top: 0.75rem;
    position: relative;
}

.copy-btn {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.copy-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

/* INPUT AREA */
.chat-input-container {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.input-wrapper {
    display: flex;
    gap: 1rem;
}

.input-field {
    flex: 1;
    min-height: 60px;
    max-height: 150px;
    padding: 1rem;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 0.9375rem;
    font-family: inherit;
    resize: vertical;
    transition: all 0.2s;
}

.input-field:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(30, 64, 175, 0.1);
}

.input-actions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.btn {
    padding: 1rem 1.5rem;
    border: none;
    border-radius: 10px;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    box-shadow: var(--shadow);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

.btn-icon {
    font-size: 1.25rem;
}

/* LOADING */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* TOAST */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    background: var(--text-primary);
    color: white;
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease-out;
    z-index: 2000;
}

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.warning { background: var(--warning); }

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* RESPONSIVE */
@media (max-width: 1024px) {
    .container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        order: 2;
    }
    
    .chat-container {
        order: 1;
    }
}

@media (max-width: 640px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .container {
        padding: 0 1rem;
        margin: 1rem auto;
    }
    
    .input-wrapper {
        flex-direction: column;
    }
    
    .input-actions {
        flex-direction: row;
    }
}