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

:root {
    --bg-primary: #212121;
    --bg-secondary: #171717;
    --bg-tertiary: #2f2f2f;
    --bg-hover: #3a3a3a;
    --text-primary: #ececec;
    --text-secondary: #b4b4b4;
    --text-muted: #8e8e8e;
    --border-color: #444444;
    --accent-color: #10a37f;
    --user-bubble: #2f2f2f;
    --assistant-bubble: transparent;
}

body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    height: 100svh;
    max-height: -webkit-fill-available;
    overflow: hidden;
}

.container {
    display: flex;
    height: 100vh;
    height: 100svh;
    max-height: -webkit-fill-available;
    position: relative;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 15px;
    left: 15px;
    z-index: 999;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 18px;
    transition: all 0.3s ease;
    align-items: center;
    justify-content: center;
}

.mobile-menu-btn:hover {
    background-color: var(--bg-tertiary);
}

.mobile-menu-btn:active {
    transform: scale(0.95);
}

/* Sidebar Close Button */
.sidebar-close-btn {
    display: none;
    position: absolute;
    top: 15px;
    right: 15px;
    z-index: 1001;
    background-color: transparent;
    border: none;
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 20px;
    transition: all 0.2s ease;
    align-items: center;
    justify-content: center;
}

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

.sidebar-close-btn:active {
    transform: scale(0.95);
}

/* Sidebar Styles */
.sidebar {
    width: 280px;
    background-color: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 12px;
    display: flex;
    gap: 8px;
}

.new-chat-btn {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
}

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

.search-btn {
    padding: 10px 14px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.search-box {
    padding: 8px 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid var(--border-color);
}

.search-box input {
    flex: 1;
    padding: 8px 12px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
}

.search-box input:focus {
    border-color: var(--accent-color);
}

.clear-search-btn {
    padding: 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    transition: background-color 0.2s;
}

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

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

.chat-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 14px;
    transition: background-color 0.2s;
    margin-bottom: 2px;
    position: relative;
}

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

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

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

.chat-item-menu-btn {
    display: none;
    padding: 4px 8px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 4px;
}

.chat-item:hover .chat-item-menu-btn {
    display: block;
}

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

/* Chat Item Dropdown Menu */
.chat-item-dropdown {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    margin-top: 4px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    z-index: 1000;
    min-width: 180px;
}

.chat-item-dropdown.show {
    display: block;
}

.chat-item-dropdown .menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 16px;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
    text-align: left;
    white-space: nowrap;
}

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

.chat-item-dropdown .menu-item i {
    width: 16px;
    text-align: center;
    color: var(--text-secondary);
}

.chat-item-dropdown .menu-item.delete-item {
    color: #ff6b6b;
}

.chat-item-dropdown .menu-item.delete-item i {
    color: #ff6b6b;
}

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

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.user-info:hover {
    background-color: var(--bg-tertiary);
}

.user-avatar {
    width: 32px;
    height: 32px;
    background-color: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.user-name {
    font-size: 14px;
    color: var(--text-primary);
}

/* Main Content Styles */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
}

.main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-bottom: 1px solid transparent;
}

.model-selector {
    position: relative;
    display: flex;
    align-items: center;
}

.model-selector select {
    appearance: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    padding: 8px 30px 8px 12px;
    cursor: pointer;
    outline: none;
}

.model-selector i {
    position: absolute;
    right: 10px;
    pointer-events: none;
    font-size: 12px;
    color: var(--text-muted);
}

.header-actions {
    display: flex;
    gap: 8px;
}

.share-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
}

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

/* Chat Area */
.chat-area {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.welcome-screen {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.welcome-screen h1 {
    font-size: 28px;
    font-weight: 500;
    color: var(--text-primary);
}

.messages {
    max-width: 768px;
    margin: 0 auto;
    width: 100%;
}

.message {
    margin-bottom: 24px;
    animation: fadeIn 0.3s ease;
}

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

.message-user {
    display: flex;
    justify-content: flex-end;
}

.message-user .message-content {
    background-color: var(--user-bubble);
    padding: 12px 16px;
    border-radius: 20px;
    max-width: none;
    min-width: 60px;
}

.message-assistant {
    display: flex;
    gap: 12px;
}

.message-avatar {
    width: 28px;
    height: 28px;
    min-width: 28px;
    background: linear-gradient(135deg, #10a37f 0%, #1a7f64 100%);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.message-assistant .message-content {
    flex: 1;
    padding: 4px 0;
    line-height: 1.6;
}

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

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

.message-content pre {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin: 12px 0;
}

.message-content code {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 14px;
}

.message-content ul, .message-content ol {
    margin: 12px 0;
    padding-left: 24px;
}

.message-content li {
    margin-bottom: 8px;
}

.message-files {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 8px;
}

.file-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.file-badge i {
    color: var(--accent-color);
}

.warning-message {
    background-color: #fef3c7;
    color: #92400e;
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.warning-message i {
    color: #f59e0b;
}

.error-message-card {
    background-color: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(248, 113, 113, 0.35);
    border-radius: 12px;
    padding: 12px 14px;
}

.error-message-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: #fecaca;
    margin-bottom: 6px;
}

.error-message-title i {
    color: #fca5a5;
}

.error-message-body {
    color: #fecaca;
    font-size: 14px;
    line-height: 1.5;
}

.error-message-actions {
    margin: 8px 0 0 20px;
    color: #fecaca;
    font-size: 13px;
}

.error-message-actions li {
    margin-bottom: 4px;
}

/* Input Area */
.input-area {
    padding: 16px 20px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.input-container {
    max-width: 768px;
    width: 100%;
}

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

.file-validation-message {
    width: 100%;
    background-color: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(248, 113, 113, 0.35);
    border-radius: 10px;
    padding: 10px 12px;
    margin-bottom: 4px;
}

.file-validation-title {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #fecaca;
    font-size: 13px;
    font-weight: 600;
}

.file-validation-title i {
    color: #fca5a5;
}

.file-validation-list {
    margin: 6px 0 0 20px;
    color: #fecaca;
    font-size: 12px;
    line-height: 1.5;
}

.file-validation-list li {
    margin-bottom: 2px;
}

.file-preview-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    font-size: 13px;
}

/* Image Preview in Input Area */
.file-preview-item.image-preview {
    position: relative;
    width: 100px;
    height: 100px;
    padding: 0;
    border-radius: 12px;
    overflow: visible;
}

.file-preview-item.image-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    cursor: pointer;
    transition: transform 0.2s, filter 0.2s;
    border-radius: 12px;
}

.file-preview-item.image-preview:hover img {
    transform: scale(1.05);
    filter: brightness(0.8);
}

.file-preview-item.image-preview .image-loading {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    background-color: var(--bg-tertiary);
    border-radius: 12px;
}

.preview-actions {
    position: absolute;
    top: -8px;
    right: -8px;
    display: flex;
    gap: 4px;
    opacity: 0.7;
    transition: opacity 0.2s;
    z-index: 10;
}

/* Show X button more clearly when hovering the image container */
.file-preview-item.image-preview:hover .preview-actions {
    opacity: 1;
}

.preview-action-btn {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: rgba(220, 38, 38, 0.9);
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    transition: background-color 0.2s, transform 0.2s;
}

.preview-action-btn:hover {
    background-color: rgba(239, 68, 68, 1);
    transform: scale(1.1);
}

/* File Card Preview in Input Area */
.file-preview-item.file-card {
    padding: 10px 14px;
    gap: 10px;
    border-radius: 12px;
    max-width: 260px;
}

.file-preview-item.file-card .file-icon {
    width: 36px;
    height: 36px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.file-icon.pdf { background-color: #ef4444; color: white; }
.file-icon.doc { background-color: #3b82f6; color: white; }
.file-icon.excel { background-color: #22c55e; color: white; }
.file-icon.ppt { background-color: #f97316; color: white; }
.file-icon.txt { background-color: #6b7280; color: white; }
.file-icon.default { background-color: #8b5cf6; color: white; }

.file-preview-item.file-card .file-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.file-preview-item.file-card .file-name {
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-preview-item.file-card .file-type {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
}

.preview-remove-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 16px;
    padding: 4px;
    transition: color 0.2s;
}

.preview-remove-btn:hover {
    color: #ff6b6b;
}

.file-preview-item button {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
}

.file-preview-item button:hover {
    color: #ff6b6b;
}

/* Message File Items - Images and Files in sent messages */
.message-files {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 8px;
}

.message-file-item {
    cursor: pointer;
    transition: all 0.2s;
}

.message-file-item.image-item {
    max-width: 250px;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
}

.message-file-item.image-item:hover {
    transform: scale(1.02);
}

.message-file-item.image-item.shared-image-hidden {
    cursor: default;
    background: repeating-linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.04),
        rgba(255, 255, 255, 0.04) 8px,
        rgba(0, 0, 0, 0.12) 8px,
        rgba(0, 0, 0, 0.12) 16px
    );
    border: 1px dashed rgba(255, 255, 255, 0.12);
}

.message-file-item.image-item.shared-image-hidden:hover {
    transform: none;
}

.message-file-item.image-item.shared-image-hidden .message-image-thumb {
    opacity: 0.08;
    filter: grayscale(100%);
}

.shared-image-label {
    position: absolute;
    left: 8px;
    right: 8px;
    bottom: 8px;
    padding: 6px 10px;
    background: rgba(0, 0, 0, 0.65);
    color: #e6e6e6;
    font-size: 12px;
    border-radius: 8px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.message-image-thumb {
    width: 100%;
    max-height: 200px;
    object-fit: cover;
    display: block;
    border-radius: 12px;
}

.message-image-action-btn {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: none;
    background: rgba(0, 0, 0, 0.55);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s, transform 0.2s;
}

.message-file-item.image-item:hover .message-image-action-btn {
    opacity: 1;
    transform: scale(1.02);
}

.message-image-action-btn:hover {
    background: rgba(0, 0, 0, 0.7);
}

.message-file-item.file-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background-color: var(--bg-tertiary);
    border-radius: 12px;
    min-width: 200px;
    max-width: 320px;
}

.message-file-item.file-item:hover {
    background-color: var(--bg-hover);
}

.message-file-item .file-icon {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.message-file-item .file-details {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.message-file-item .file-name {
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 14px;
}

.message-file-item .file-type {
    font-size: 12px;
    color: var(--text-muted);
}

/* Uploading state for file items */
.message-file-item.uploading {
    cursor: not-allowed;
    opacity: 0.7;
    pointer-events: none;
}

.message-file-item.image-item.uploading {
    position: relative;
    width: 100px;
    height: 100px;
    background-color: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    z-index: 5;
}

.upload-overlay i {
    color: white;
    font-size: 20px;
}

.image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary);
    border-radius: 12px;
}

.image-placeholder i {
    font-size: 32px;
    color: var(--text-muted);
}

.message-text {
    margin: 0;
}

.web-search-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    background-color: var(--bg-tertiary);
    border-radius: 20px;
    margin-bottom: 8px;
    border: 1px solid var(--accent-color);
}

.web-search-toggle i {
    color: var(--accent-color);
    font-size: 16px;
}

.web-search-toggle span {
    flex: 1;
    font-size: 14px;
    color: var(--text-primary);
}

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

.close-toggle:hover {
    color: var(--text-primary);
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    background-color: var(--bg-tertiary);
    border-radius: 24px;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    transition: border-color 0.2s;
    position: relative;
}

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

.input-wrapper.drag-over {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(16, 163, 127, 0.25);
}

.attach-menu {
    display: none;
    position: absolute;
    bottom: 100%;
    left: 0;
    margin-bottom: 8px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    z-index: 1000;
}

.attach-menu.show {
    display: block;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 14px 16px;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
    text-align: left;
    white-space: nowrap;
}

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

.menu-item i {
    font-size: 16px;
    color: var(--text-secondary);
}

.menu-item:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}

.attach-btn, .voice-btn, .send-btn {
    width: 36px;
    height: 36px;
    min-width: 36px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: all 0.2s;
}

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

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

.send-btn:hover {
    background-color: #ffffff;
}

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

#messageInput {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 16px;
    resize: none;
    max-height: 200px;
    line-height: 1.5;
    padding: 8px 0;
}

#messageInput::placeholder {
    color: var(--text-muted);
}

.disclaimer {
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
}

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

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

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

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

/* Loading animation */
.loading {
    display: flex;
    gap: 4px;
    padding: 8px 0;
}

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

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

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

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

/* Dialog Overlay */
.dialog-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.dialog-overlay.show {
    display: flex;
}

.dialog {
    background-color: var(--bg-secondary);
    border-radius: 16px;
    padding: 24px;
    max-width: 400px;
    width: 90%;
    animation: dialogIn 0.2s ease;
}

@keyframes dialogIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.dialog h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.dialog p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.dialog-buttons {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.dialog-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.dialog-btn.cancel-btn {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

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

.dialog-btn.delete-btn {
    background-color: #ff4444;
    color: white;
}

.dialog-btn.delete-btn:hover {
    background-color: #ff2222;
}

.dialog-btn.save-btn {
    background-color: var(--accent-color);
    color: white;
}

.dialog-btn.save-btn:hover {
    background-color: #0d8a6a;
}

.rename-input {
    width: 100%;
    padding: 12px 16px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    margin-bottom: 20px;
    outline: none;
}

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

.edit-dialog {
    max-width: 600px;
}

.edit-textarea {
    width: 100%;
    min-height: 120px;
    padding: 12px 16px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    margin-bottom: 20px;
    outline: none;
    resize: vertical;
    font-family: inherit;
    line-height: 1.5;
}

.edit-textarea:focus {
    border-color: var(--accent-color);
}

/* User Message Actions */
.message-user {
    position: relative;
}

.message-user-wrapper {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.message-actions {
    display: none;
    gap: 4px;
    margin-top: 4px;
}

.message-user:hover .message-actions {
    display: flex;
}

.message-action-btn {
    padding: 6px 8px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 6px;
    font-size: 14px;
    transition: all 0.2s;
}

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

/* Branch Navigation */
.branch-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-top: 8px;
    color: var(--text-muted);
    font-size: 13px;
}

.branch-nav button {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px 6px;
    border-radius: 4px;
    font-size: 12px;
}

.branch-nav button:hover:not(:disabled) {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.branch-nav button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.branch-nav span {
    padding: 0 4px;
    min-width: 30px;
    text-align: center;
}

/* Image Preview Modal */
.image-preview-container {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
}

.image-preview-container img {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 8px;
}

.close-preview-btn {
    position: absolute;
    top: -40px;
    right: 0;
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    padding: 8px;
}

.close-preview-btn:hover {
    color: var(--text-muted);
}

/* Clickable File Badge */
.file-badge.clickable {
    cursor: pointer;
    transition: all 0.2s;
}

.file-badge.clickable:hover {
    background-color: var(--bg-hover);
}

/* Image Thumbnail in Message */
.message-image-thumbnail {
    max-width: 200px;
    max-height: 150px;
    border-radius: 8px;
    margin-top: 8px;
    cursor: pointer;
    transition: opacity 0.2s;
}

.message-image-thumbnail:hover {
    opacity: 0.8;
}

/* Login Screen */
.login-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.login-container {
    text-align: center;
    padding: 40px;
    max-width: 400px;
}

.login-logo {
    font-size: 48px;
    color: var(--accent-color);
    margin-bottom: 24px;
}

.login-container h1 {
    font-size: 28px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

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

.google-login-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    padding: 14px 24px;
    background-color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    color: #333;
    transition: background-color 0.2s, box-shadow 0.2s;
}

.google-login-btn:hover {
    background-color: #f5f5f5;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.google-icon {
    width: 20px;
    height: 20px;
}

/* Email/Password Auth Form */
.email-auth-form {
    margin-bottom: 24px;
}

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

.password-input-group {
    position: relative;
}

.password-input-group .auth-input {
    padding-right: 45px;
}

.password-toggle-btn {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.password-toggle-btn:hover {
    color: var(--text-primary);
}

.password-toggle-btn i {
    font-size: 16px;
}

#passwordRequirements {
    padding: 16px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 16px;
}

.password-requirements-title {
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: 12px;
    font-weight: 500;
}

.password-requirements-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.password-requirements-list li {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 6px 0;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color 0.2s;
}

.password-requirements-list li i {
    font-size: 10px;
    color: var(--text-secondary);
    transition: color 0.2s;
    min-width: 10px;
}

.password-requirements-list li.met {
    color: var(--accent-color);
}

.password-requirements-list li.met i {
    display: none;
}

.password-requirements-list li.met::before {
    content: '✓';
    font-size: 16px;
    font-weight: bold;
    color: var(--accent-color);
    min-width: 10px;
    display: inline-block;
}

.auth-input {
    width: 100%;
    padding: 14px 16px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    color: var(--text-primary);
    transition: border-color 0.2s;
    box-sizing: border-box;
}

.auth-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.auth-input::placeholder {
    color: var(--text-secondary);
}

.email-login-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 14px 24px;
    background-color: var(--accent-color);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    color: white;
    transition: opacity 0.2s;
}

.email-login-btn:hover {
    opacity: 0.9;
}

.auth-error {
    margin-top: 12px;
    padding: 12px;
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 8px;
    color: #ef4444;
    font-size: 14px;
    text-align: center;
}

.auth-toggle {
    margin-top: 16px;
    font-size: 14px;
    color: var(--text-secondary);
}

.auth-toggle a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    margin-left: 4px;
}

.auth-toggle a:hover {
    text-decoration: underline;
}

.login-divider {
    display: flex;
    align-items: center;
    margin: 24px 0;
    color: var(--text-secondary);
    font-size: 14px;
}

.login-divider::before,
.login-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--border-color);
}

.login-divider span {
    padding: 0 16px;
}

/* Admin Menu */
.admin-menu {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
}

.admin-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    color: var(--accent-color);
    text-decoration: none;
    font-size: 14px;
    transition: background-color 0.2s;
}

.admin-link:hover {
    background-color: var(--bg-hover);
}

.admin-link i {
    font-size: 14px;
}

/* Slide App Menu */
.slide-app-menu {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
}

.slide-app-link {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 12px;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    border: none;
    margin: 0;
    appearance: none;
    -webkit-appearance: none;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    color: var(--accent-color);
    text-decoration: none;
    text-align: left;
    cursor: pointer;
    transition: background-color 0.2s;
}

.slide-app-link:hover {
    background-color: var(--bg-hover);
}

.slide-app-link i {
    font-size: 14px;
    color: var(--accent-color);
}

/* User Avatar Image */
.avatar-img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.user-avatar {
    width: 32px;
    height: 32px;
    min-width: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Logout Button */
.logout-btn {
    padding: 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    transition: background-color 0.2s, color 0.2s;
    margin-left: auto;
}

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

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -260px;
        height: 100vh;
        z-index: 100;
        transition: left 0.3s;
    }

    .sidebar.open {
        left: 0;
    }

    .messages {
        padding: 0 16px;
    }

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

    .login-container {
        padding: 24px;
    }
}

/* Mobile Responsive - Sidebar Overlay */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }
    
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        width: 280px;
        height: 100vh;
        height: 100svh;
        max-height: -webkit-fill-available;
        overflow-y: auto;
        z-index: 1000;
        transform: translateX(-100%);
        box-shadow: 2px 0 10px rgba(0, 0, 0, 0.3);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .sidebar.active .sidebar-close-btn {
        display: flex;
    }
    
    .sidebar.active .sidebar-header {
        padding-top: 60px;
    }
    
    .sidebar.active ~ .mobile-menu-btn {
        display: none;
    }
    
    .main-content {
        width: 100%;
        margin-left: 0;
        height: 100vh;
        height: 100svh;
        max-height: -webkit-fill-available;
        overflow-y: auto;
    }
    
    .main-header {
        padding-left: 60px;
    }
}