/* CSS Variables */
:root {
    --bg-primary: #212121;
    --bg-secondary: #171717;
    --bg-tertiary: #2f2f2f;
    --bg-hover: #3a3a3a;
    --text-primary: #ececec;
    --text-secondary: #b4b4b4;
    --text-muted: #8e8e8e;
    --border-color: #3a3a3a;
    --accent-color: #10a37f;
    --accent-hover: #1a7f64;
    --error-color: #ef4444;
    --sidebar-width: 260px;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

/* App Container */
.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
}

.sidebar-header {
    padding: 12px;
}

.new-chat-btn {
    width: 100%;
    padding: 12px 16px;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background-color 0.2s;
}

.new-chat-btn:hover {
    background-color: var(--bg-hover);
}

.clear-history-btn {
    margin-top: 8px;
}

.chat-history {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.chat-history-item {
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.chat-history-item:hover {
    background-color: var(--bg-hover);
}

.chat-history-item.active {
    background-color: var(--bg-tertiary);
}

.chat-title {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-delete-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    line-height: 1;
    border-radius: 6px;
}

.chat-delete-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.sidebar-footer {
    padding: 12px;
    border-top: 1px solid var(--border-color);
}

.settings-btn {
    width: 100%;
    padding: 10px 12px;
    background-color: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background-color 0.2s;
}

.settings-btn:hover {
    background-color: var(--bg-hover);
}

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

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

/* Welcome Screen */
.welcome-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    text-align: center;
}

.welcome-logo {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-color: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.welcome-screen h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
}

.welcome-subtitle {
    color: var(--text-secondary);
    font-size: 16px;
    margin-bottom: 32px;
}

.example-prompts {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    max-width: 600px;
}

.example-btn {
    padding: 16px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.2s;
}

.example-btn:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--text-muted);
}

.example-btn span {
    font-size: 20px;
}

/* Messages */
.messages {
    flex: 1;
    padding: 20px;
    display: none;
}

.messages.active {
    display: block;
}

.message {
    max-width: 800px;
    margin: 0 auto 24px;
    padding: 16px 24px;
}

.message.user {
    background-color: var(--bg-tertiary);
    border-radius: 16px;
    margin-left: auto;
    margin-right: 0;
    max-width: 70%;
}

.uploaded-image-preview {
    margin-bottom: 8px;
}

.uploaded-image-preview img {
    max-width: 150px;
    max-height: 100px;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s;
}

.uploaded-image-preview img:hover {
    transform: scale(1.05);
}

/* Multiple uploaded images preview in message */
.uploaded-images-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 8px;
}

.uploaded-images-preview img {
    max-width: 100px;
    max-height: 80px;
    border-radius: 6px;
    cursor: pointer;
    transition: transform 0.2s;
    object-fit: cover;
}

.uploaded-images-preview img:hover {
    transform: scale(1.05);
}

.image-placeholder {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    margin-bottom: 8px;
    font-size: 13px;
    color: var(--text-muted);
}

.image-placeholder svg {
    opacity: 0.6;
    flex-shrink: 0;
}

.message.assistant {
    padding-left: 0;
}

.message-content {
    line-height: 1.6;
}

.message-content p {
    margin-bottom: 12px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.generated-image {
    max-width: 100%;
    max-height: 512px;
    border-radius: 12px;
    margin-top: 12px;
    cursor: pointer;
    transition: transform 0.2s;
}

.generated-image:hover {
    transform: scale(1.02);
}

.loading-indicator {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
}

.loading-dots {
    display: flex;
    gap: 4px;
}

.loading-dots span {
    width: 8px;
    height: 8px;
    background-color: var(--text-muted);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dots span:nth-child(2) {
    animation-delay: -0.16s;
}

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

.error-message {
    color: var(--error-color);
    background-color: rgba(239, 68, 68, 0.1);
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* Parameters Panel */
.params-panel {
    max-width: 800px;
    margin: 0 auto 12px;
}

.params-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.params-toggle:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.params-toggle .chevron {
    margin-left: auto;
    transition: transform 0.2s;
}

.params-panel.active .params-toggle .chevron {
    transform: rotate(180deg);
}

.params-content {
    display: none;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    margin-top: 8px;
}

.params-panel.active .params-content {
    display: block;
}

.param-group {
    margin-bottom: 12px;
}

.param-group:last-of-type {
    margin-bottom: 16px;
}

.param-group label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.param-group select {
    width: 100%;
    padding: 8px 12px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
}

.param-group select:focus {
    border-color: var(--accent-color);
}

.param-group select:hover {
    border-color: var(--text-muted);
}

.param-info {
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.param-info p {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.param-info p:last-child {
    margin-bottom: 0;
}

.param-info strong {
    color: var(--text-secondary);
}

/* Image Grid for multiple images */
.image-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-top: 12px;
}

.image-grid.single {
    grid-template-columns: 1fr;
}

.image-grid img {
    width: 100%;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s;
}

.image-grid img:hover {
    transform: scale(1.02);
}

/* Upload Preview */
.upload-preview {
    max-width: 800px;
    margin: 0 auto 12px;
    display: none;
    position: relative;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px;
}

.upload-preview.active {
    display: block;
}

.preview-content {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 8px;
}

.preview-image-wrapper {
    position: relative;
    display: inline-block;
}

.preview-image-wrapper img {
    width: 80px;
    height: 80px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    object-fit: cover;
    cursor: pointer;
}

.preview-image-wrapper img:hover {
    border-color: var(--text-muted);
}

.remove-single-image-btn {
    position: absolute;
    top: -6px;
    right: -6px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    padding: 0;
}

.remove-single-image-btn:hover {
    background-color: var(--error-color);
    color: white;
    border-color: var(--error-color);
}

.clear-all-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-muted);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.clear-all-btn:hover {
    background-color: var(--error-color);
    color: white;
    border-color: var(--error-color);
}

/* Input Area */
.input-area {
    padding: 16px 24px 24px;
    background-color: var(--bg-primary);
}

.input-container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--bg-tertiary);
    border-radius: 16px;
    padding: 12px 16px;
    display: flex;
    align-items: flex-end;
    gap: 12px;
    border: 1px solid var(--border-color);
    transition: border-color 0.2s;
}

.input-container:focus-within {
    border-color: var(--text-muted);
}

.input-container textarea {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 16px;
    font-family: inherit;
    resize: none;
    max-height: 200px;
    line-height: 1.5;
}

.input-container textarea::placeholder {
    color: var(--text-muted);
}

.upload-btn {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background-color: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
    color: var(--text-muted);
}

.upload-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-hover);
}

.upload-btn.has-image {
    color: var(--accent-color);
}

.send-btn {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background-color: var(--text-primary);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.send-btn svg {
    color: var(--bg-primary);
}

.send-btn:hover {
    background-color: var(--text-secondary);
}

.send-btn:disabled {
    background-color: var(--text-muted);
    cursor: not-allowed;
}

.disclaimer {
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 12px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background-color: var(--bg-secondary);
    border-radius: 16px;
    width: 100%;
    max-width: 480px;
    border: 1px solid var(--border-color);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 18px;
    font-weight: 600;
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-hover);
}

.modal-body {
    padding: 24px;
}

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

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

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus {
    border-color: var(--accent-color);
}

.form-hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 8px;
}

.form-hint a {
    color: var(--accent-color);
    text-decoration: none;
}

.form-hint a:hover {
    text-decoration: underline;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
}

.btn-primary,
.btn-secondary {
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background-color: var(--accent-color);
    border: none;
    color: white;
}

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

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

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

/* Image Modal */
.image-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1001;
}

.image-modal-overlay.active {
    display: flex;
}

.image-modal-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.image-modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    padding: 8px;
}

.image-modal-close:hover {
    color: var(--text-secondary);
}

#modalImage {
    max-width: 100%;
    max-height: calc(90vh - 80px);
    border-radius: 8px;
}

.image-modal-actions {
    margin-top: 16px;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background-color: var(--bg-hover);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -100%;
        z-index: 100;
        height: 100vh;
        transition: left 0.3s;
    }

    .sidebar.active {
        left: 0;
    }

    .example-prompts {
        grid-template-columns: 1fr;
    }

    .message.user {
        max-width: 85%;
    }
}