/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
    line-height: 1.6;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 40px);
    max-height: 900px;
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 24px;
    text-align: center;
}

header h1 {
    font-size: 32px;
    margin-bottom: 8px;
    font-weight: 600;
}

.subtitle {
    font-size: 14px;
    opacity: 0.9;
}

/* Tab Navigation */
.nav-tabs {
    display: flex;
    background: #f8f9fa;
    border-bottom: 2px solid #e0e0e0;
    padding: 0 20px;
    gap: 4px;
}

.nav-tab {
    padding: 16px 24px;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: #666;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.nav-tab:hover {
    background: rgba(102, 126, 234, 0.05);
    color: #667eea;
}

.nav-tab.active {
    color: #667eea;
    border-bottom-color: #667eea;
    background: white;
}

.nav-tab:focus {
    outline: none;
}

/* Main Content Area */
.main-content {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.feature-container {
    display: none;
    flex: 1;
    overflow: hidden;
    flex-direction: column;
}

.feature-container.active {
    display: flex;
}

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

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    background: #f8f9fa;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    display: flex;
    flex-direction: column;
    max-width: 75%;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    align-self: flex-end;
}

.message.assistant {
    align-self: flex-start;
}

.message-content {
    padding: 12px 16px;
    border-radius: 18px;
    word-wrap: break-word;
    line-height: 1.5;
}

.message.user .message-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-bottom-right-radius: 4px;
}

.message.assistant .message-content {
    background: white;
    color: #333;
    border: 1px solid #e0e0e0;
    border-bottom-left-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.message-label {
    font-size: 12px;
    color: #666;
    margin-bottom: 4px;
    padding: 0 4px;
}

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

.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 12px 16px;
    background: white;
    border-radius: 18px;
    border: 1px solid #e0e0e0;
    max-width: 60px;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: #667eea;
    border-radius: 50%;
    animation: typing 1.4s 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: 0.7;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

.chat-input-container {
    padding: 20px;
    background: white;
    border-top: 1px solid #e0e0e0;
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

#message-input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    font-size: 14px;
    font-family: inherit;
    resize: none;
    outline: none;
    transition: border-color 0.2s;
}

#message-input:focus {
    border-color: #667eea;
}

#message-input:disabled {
    background: #f5f5f5;
    cursor: not-allowed;
}

/* Image Generation Feature Styles */
.image-generation-container {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow-y: auto;
    padding: 40px;
    background: #f8f9fa;
}

.input-section {
    margin-bottom: 30px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
}

textarea, select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

textarea:focus, select:focus {
    outline: none;
    border-color: #667eea;
}

textarea {
    resize: vertical;
    min-height: 100px;
}

.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

/* Shared Button Styles */
.send-button,
.generate-btn {
    padding: 12px 24px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.send-button:hover:not(:disabled),
.generate-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.send-button:active:not(:disabled),
.generate-btn:active:not(:disabled) {
    transform: translateY(0);
}

.send-button:disabled,
.generate-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.generate-btn {
    width: 100%;
    padding: 15px 30px;
}

.btn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Result Section */
.result-section {
    text-align: center;
    padding: 20px;
    border: 2px dashed #e1e5e9;
    border-radius: 15px;
    background: white;
    margin-bottom: 20px;
}

.result-section h3 {
    margin-bottom: 20px;
    color: #555;
}

.image-container {
    margin-bottom: 20px;
}

.image-container img {
    max-width: 100%;
    max-height: 500px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.image-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.action-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-btn:not(.secondary) {
    background: #28a745;
    color: white;
}

.action-btn.secondary {
    background: #6c757d;
    color: white;
}

.action-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* Error Section */
.error-section {
    text-align: center;
    padding: 20px;
    border: 2px solid #dc3545;
    border-radius: 15px;
    background: #f8d7da;
    margin-bottom: 20px;
}

.error-message h3 {
    color: #721c24;
    margin-bottom: 10px;
}

.error-message p {
    color: #721c24;
    margin-bottom: 15px;
}

/* Scrollbar styling */
.chat-messages::-webkit-scrollbar,
.image-generation-container::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track,
.image-generation-container::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.chat-messages::-webkit-scrollbar-thumb,
.image-generation-container::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb:hover,
.image-generation-container::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    background: #f8f9fa;
    border-top: 1px solid #e0e0e0;
    color: #666;
    font-size: 14px;
}

footer a {
    color: #667eea;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Mobile responsiveness */
@media (max-width: 768px) {
    body {
        padding: 0;
    }

    .container {
        height: 100vh;
        max-height: 100vh;
        border-radius: 0;
    }

    header h1 {
        font-size: 24px;
    }

    .nav-tabs {
        padding: 0 10px;
        overflow-x: auto;
    }

    .nav-tab {
        padding: 12px 16px;
        font-size: 14px;
        white-space: nowrap;
    }

    .message {
        max-width: 85%;
    }

    .image-generation-container {
        padding: 20px;
    }

    .options-grid {
        grid-template-columns: 1fr;
    }

    .image-actions {
        flex-direction: column;
        align-items: center;
    }

    .action-btn {
        width: 100%;
        max-width: 200px;
    }
}