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

:root {
    --qboid-yellow: #FFD32B;
    --qboid-yellow-dark: #E6BE26;
    --qboid-yellow-darker: #CCA821;
    --qboid-blue: #3B82F6;
    --qboid-gray-dark: #2D2D2D;
    --qboid-gray: #3D3D3D;
    --qboid-gray-light: #4D4D4D;
    --qboid-bg-dark: #1A1A1A;
    --qboid-bg: #242424;
    --qboid-text: #E8E8E8;
    --qboid-text-muted: #9CA3AF;
}

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

.container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--qboid-gray-dark);
    display: flex;
    flex-direction: column;
    transition: margin-left 0.3s ease;
    border-right: 1px solid var(--qboid-gray);
}

.sidebar.hidden {
    margin-left: -260px;
}

.sidebar-header {
    padding: 12px;
    border-bottom: 1px solid var(--qboid-gray);
    position: relative;
}

.close-sidebar-btn {
    display: none;
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--qboid-gray);
    border: none;
    color: var(--qboid-text);
    font-size: 32px;
    font-weight: bold;
    cursor: pointer;
    padding: 8px 16px;
    line-height: 1;
    transition: all 0.2s;
    border-radius: 6px;
    min-width: 44px;
    min-height: 44px;
}

.close-sidebar-btn:hover {
    background: var(--qboid-gray-light);
    color: var(--qboid-yellow);
}

.new-chat-btn {
    width: 100%;
    padding: 12px 16px;
    background: var(--qboid-yellow);
    border: none;
    border-radius: 8px;
    color: #1A1A1A;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(255, 211, 43, 0.25);
}

.new-chat-btn:hover {
    background: var(--qboid-yellow-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(255, 211, 43, 0.4);
}

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

.chat-list-header {
    padding: 8px 12px;
    margin-top: 8px;
    margin-bottom: 8px;
    font-size: 11px;
    font-weight: 700;
    color: var(--qboid-yellow);
    text-transform: uppercase;
    letter-spacing: 1px;
    background-color: rgba(255, 211, 43, 0.1);
    border-radius: 4px;
}

.chat-list-separator {
    height: 1px;
    background-color: var(--qboid-gray);
    margin: 12px 8px;
}

.chat-item {
    padding: 12px;
    margin-bottom: 4px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background-color 0.2s;
    position: relative;
}

.chat-item:hover {
    background-color: var(--qboid-gray);
}

.chat-item.active {
    background-color: var(--qboid-gray-light);
    border-left: 3px solid var(--qboid-yellow);
    padding-left: 9px;
}

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

/* Drag handle for favorites */
.drag-handle {
    font-size: 14px;
    line-height: 1;
    color: var(--qboid-text-muted);
    cursor: grab;
    padding: 2px 6px;
    flex-shrink: 0;
    user-select: none;
    transition: color 0.2s, background-color 0.2s;
    border-radius: 4px;
    margin-left: auto;
}

.drag-handle:hover {
    color: var(--qboid-yellow);
    background-color: var(--qboid-gray);
}

.drag-handle:active {
    cursor: grabbing;
}

/* Drag-and-drop states for favorites */
.chat-item.favorite {
    cursor: pointer;
}

.chat-item.dragging {
    opacity: 0.4;
}

.chat-item.drag-over-top::before {
    content: '';
    position: absolute;
    top: -2px;
    left: 0;
    right: 0;
    height: 3px;
    background-color: var(--qboid-yellow);
    border-radius: 2px;
    box-shadow: 0 0 8px rgba(255, 211, 43, 0.6);
}

.chat-item.drag-over-bottom::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 3px;
    background-color: var(--qboid-yellow);
    border-radius: 2px;
    box-shadow: 0 0 8px rgba(255, 211, 43, 0.6);
}

/* Drag reference state */
.chat-item.dragging-reference {
    opacity: 0.6;
}

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

.user-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    font-size: 14px;
    color: var(--qboid-text-muted);
}

#user-display {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.auth-btn {
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--qboid-yellow);
    border-radius: 4px;
    color: var(--qboid-yellow);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.auth-btn:hover {
    background: var(--qboid-yellow);
    color: #1A1A1A;
}

.admin-btn {
    display: block;
    margin-top: 8px;
    padding: 8px 12px;
    background: #059669;
    border: none;
    border-radius: 4px;
    color: white;
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    transition: background 0.2s;
}

.admin-btn:hover {
    background: #047857;
}

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

.chat-header {
    padding: 16px 24px;
    background-color: var(--qboid-gray-dark);
    border-bottom: 1px solid var(--qboid-gray);
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.toggle-sidebar {
    background: none;
    border: none;
    color: var(--qboid-text);
    font-size: 24px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: background-color 0.2s;
}

.toggle-sidebar:hover {
    background-color: var(--qboid-gray);
}

.title-container {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 8px;
}

#chat-title {
    font-size: 18px;
    font-weight: 600;
    border: 2px solid transparent;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s ease;
    outline: none;
    min-width: 200px;
}

#chat-title:hover {
    background-color: var(--qboid-gray);
}

#chat-title[contenteditable="true"] {
    border-color: var(--qboid-yellow);
    background-color: var(--qboid-gray);
}

.engine-version-badge {
    display: inline-flex;
    align-items: center;
    background-color: var(--qboid-blue);
    color: white;
    font-size: 14px;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: 16px;
    white-space: nowrap;
    margin-left: 12px;
    letter-spacing: 0.3px;
}

.edit-title-btn {
    background: none;
    border: none;
    color: var(--qboid-text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.edit-title-btn:hover {
    color: var(--qboid-yellow);
    background-color: var(--qboid-gray);
}

.favorite-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px 8px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    font-size: 20px;
    margin-left: 4px;
}

.favorite-btn #favorite-icon {
    color: var(--qboid-yellow);
    transition: transform 0.2s;
}

.favorite-btn:hover #favorite-icon {
    transform: scale(1.2);
}

.favorite-btn:hover {
    background-color: var(--qboid-gray);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.cost-display {
    padding: 6px 12px;
    background-color: var(--qboid-gray);
    border-radius: 6px;
    color: var(--qboid-yellow);
    font-size: 13px;
    font-weight: 600;
    font-family: 'Courier New', monospace;
}

.delete-btn {
    padding: 8px 16px;
    background-color: transparent;
    border: 1px solid #E74C3C;
    border-radius: 6px;
    color: #E74C3C;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}

.delete-btn:hover {
    background-color: rgba(231, 76, 60, 0.1);
    border-color: #C0392B;
    color: #C0392B;
}

.share-btn {
    padding: 8px 16px;
    background-color: transparent;
    border: 1px solid var(--qboid-yellow);
    border-radius: 6px;
    color: var(--qboid-yellow);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}

.share-btn:hover {
    background-color: rgba(255, 211, 43, 0.1);
    border-color: var(--qboid-yellow-dark);
    color: var(--qboid-yellow-dark);
}

/* Chat Messages */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    padding: 0 24px;
}

.empty-state-icon {
    width: 180px;
    height: 180px;
    margin-bottom: 32px;
    padding: 32px;
    background: var(--qboid-gray-dark);
    border-radius: 24px;
    border: 2px solid rgba(255, 211, 43, 0.4);
    box-shadow: 0 8px 32px rgba(255, 211, 43, 0.2);
    object-fit: contain;
}

.empty-state h1 {
    font-size: 36px;
    color: var(--qboid-yellow);
    font-weight: 700;
    margin-bottom: 16px;
    text-shadow: 0 0 20px rgba(255, 211, 43, 0.3);
    line-height: 1.2;
}

.empty-state p {
    font-size: 18px;
    color: var(--qboid-text-muted);
    font-weight: 400;
    max-width: 600px;
    line-height: 1.6;
    margin: 0;
}

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

.message.user {
    background-color: var(--qboid-gray-dark);
}

.message.assistant {
    background-color: var(--qboid-bg-dark);
}

.message-content {
    display: flex;
    gap: 16px;
}

.message-avatar {
    width: 45px;
    height: 45px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 20px;
    flex-shrink: 0;
    overflow: hidden;
}

.message-avatar .avatar-icon {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 4px;
}

.message.user .message-avatar {
    background: var(--qboid-gray-light);
    color: var(--qboid-yellow);
}

.message.assistant .message-avatar {
    background: var(--qboid-gray-dark);
    color: #1A1A1A;
    border: 2px solid rgba(255, 211, 43, 0.4);
}

.message-text {
    flex: 1;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* Markdown formatting styles */
.message-text code {
    background-color: var(--qboid-gray);
    color: var(--qboid-yellow);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', Consolas, Monaco, monospace;
    font-size: 0.9em;
    border: 1px solid var(--qboid-gray-light);
}

.message-text strong {
    font-weight: 700;
    color: var(--qboid-yellow);
}

/* Multi-line code blocks */
.message-text pre {
    background-color: var(--qboid-bg-dark);
    border: 1px solid var(--qboid-gray);
    border-radius: 8px;
    padding: 16px;
    margin: 12px 0;
    overflow-x: auto;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.3);
}

.message-text pre code {
    background-color: transparent;
    color: var(--qboid-text);
    padding: 0;
    border: none;
    border-radius: 0;
    font-size: 0.85em;
    line-height: 1.5;
    display: block;
    white-space: pre;
}

/* Syntax highlighting hints for common languages */
.message-text pre code.language-json {
    color: #A8D9F5;
}

.message-text pre code.language-javascript,
.message-text pre code.language-js {
    color: #F5D76E;
}

.message-text pre code.language-python {
    color: #A8C7FA;
}

.message-text pre code.language-bash,
.message-text pre code.language-shell {
    color: #B8E986;
}

/* Input Area */
.input-area {
    padding: 24px;
    background-color: var(--qboid-gray-dark);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 16px;
}

@media (min-width: 1024px) {
    .input-area {
        padding-left: max(24px, calc(50% - 500px));
        padding-right: max(24px, calc(50% - 500px));
    }
}

.input-container {
    flex: 1;
    position: relative;
    background-color: var(--qboid-bg);
    border-radius: 12px;
    border: 1px solid var(--qboid-gray);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    transition: border-color 0.2s;
}

.input-container:focus-within {
    border-color: var(--qboid-yellow);
    box-shadow: 0 4px 16px rgba(255, 211, 43, 0.15);
}

/* Drop zone active state */
.input-container.drop-zone-active {
    border-color: var(--qboid-yellow);
    background-color: rgba(255, 211, 43, 0.05);
    box-shadow: 0 4px 20px rgba(255, 211, 43, 0.3);
    animation: pulse-border 1s ease-in-out infinite;
}

@keyframes pulse-border {
    0%, 100% {
        border-color: var(--qboid-yellow);
    }
    50% {
        border-color: var(--qboid-yellow-dark);
    }
}

#message-input {
    width: 100%;
    padding: 12px 48px 12px 16px;
    background-color: transparent;
    border: none;
    color: var(--qboid-text);
    font-size: 16px;
    font-family: inherit;
    resize: none;
    outline: none;
    max-height: 200px;
}

#message-input::placeholder {
    color: var(--qboid-text-muted);
}

.send-btn {
    position: absolute;
    right: 12px;
    bottom: 12px;
    width: 32px;
    height: 32px;
    background: var(--qboid-yellow);
    border: none;
    border-radius: 6px;
    color: #1A1A1A;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    z-index: 1;
}

.send-btn:hover:not(:disabled) {
    background: var(--qboid-yellow-dark);
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(255, 211, 43, 0.4);
}

.send-btn:disabled {
    background: var(--qboid-gray);
    cursor: not-allowed;
    opacity: 0.5;
}

.generate-btn {
    height: 44px;
    padding: 0 18px;
    background: linear-gradient(135deg, #E74C3C 0%, #C0392B 100%);
    border: none;
    border-radius: 10px;
    color: white;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.4);
    white-space: nowrap;
    flex-shrink: 0;
    min-width: 160px;
}

.generate-btn svg {
    width: 18px;
    height: 18px;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.3));
}

.generate-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, #C0392B 0%, #A93226 100%);
    transform: translateY(-2px) scale(1.03);
    box-shadow: 0 6px 20px rgba(231, 76, 60, 0.5);
}

.generate-btn:active:not(:disabled) {
    transform: translateY(0) scale(0.98);
}

.generate-btn:disabled {
    background: var(--qboid-gray);
    cursor: not-allowed;
    opacity: 0.5;
    box-shadow: none;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
}

.modal-content {
    background-color: var(--qboid-gray-dark);
    margin: 15% auto;
    padding: 24px;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    border: 1px solid var(--qboid-gray);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.close {
    color: var(--qboid-text-muted);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
}

.close:hover {
    color: var(--qboid-yellow);
}

.modal-content h2 {
    margin-bottom: 16px;
}

.share-link-container {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

#share-link {
    flex: 1;
    padding: 10px;
    background-color: var(--qboid-bg);
    border: 1px solid var(--qboid-gray);
    border-radius: 6px;
    color: var(--qboid-text);
    font-size: 14px;
}

#copy-link-btn {
    padding: 10px 16px;
    background: var(--qboid-yellow);
    border: none;
    border-radius: 6px;
    color: #1A1A1A;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}

#copy-link-btn:hover {
    background: var(--qboid-yellow-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 211, 43, 0.3);
}

.share-info {
    font-size: 14px;
    color: var(--qboid-text-muted);
}

/* Inline Engine Version Selector */
.engine-selector-container {
    padding: 16px 20px;
    background-color: var(--qboid-bg);
    border-top: 1px solid var(--qboid-gray);
}

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

.engine-selector-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--qboid-text-muted);
    margin-bottom: 10px;
    text-align: center;
}

.engine-selector-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.engine-selector-btn {
    padding: 12px 20px;
    background-color: var(--qboid-gray);
    border: 2px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--qboid-text);
    font-size: 14px;
    font-weight: 600;
    position: relative;
}

.engine-selector-btn:hover {
    background-color: var(--qboid-gray-light);
    border-color: var(--qboid-yellow);
}

.engine-selector-btn.selected {
    background-color: var(--qboid-yellow);
    color: var(--qboid-bg-dark);
    border-color: var(--qboid-yellow);
}

.engine-selector-btn.latest::after {
    content: 'LATEST';
    position: absolute;
    top: -8px;
    right: -8px;
    background-color: var(--qboid-blue);
    color: white;
    font-size: 9px;
    font-weight: 700;
    padding: 3px 6px;
    border-radius: 8px;
}

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--qboid-gray-light);
}

/* Auth Form Styling */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    color: var(--qboid-text);
}

.form-input {
    width: 100%;
    padding: 10px 12px;
    background-color: var(--qboid-bg);
    border: 1px solid var(--qboid-gray);
    border-radius: 6px;
    color: var(--qboid-text);
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--qboid-yellow);
}

.submit-btn {
    width: 100%;
    padding: 12px;
    background: var(--qboid-yellow);
    border: none;
    border-radius: 6px;
    color: #1A1A1A;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}

.submit-btn:hover {
    background: var(--qboid-yellow-dark);
}

.auth-switch {
    margin-top: 16px;
    text-align: center;
    font-size: 14px;
    color: var(--qboid-text-muted);
}

.auth-switch a {
    color: var(--qboid-yellow);
    text-decoration: none;
    transition: color 0.2s;
}

.auth-switch a:hover {
    color: var(--qboid-yellow-dark);
}

.error-message {
    color: #f5576c;
    font-size: 14px;
    margin-bottom: 12px;
    min-height: 20px;
}

/* Loading Animation */
.loading-message {
    opacity: 0.7;
}

.loading-dots {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 0;
}

.loading-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--qboid-yellow);
    animation: loading-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 loading-bounce {
    0%, 80%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* State Transition Indicator */
.message.system {
    background-color: transparent;
}

.state-transition {
    text-align: center;
    padding: 16px;
    background: linear-gradient(90deg,
        rgba(255, 211, 43, 0.1) 0%,
        rgba(255, 211, 43, 0.2) 50%,
        rgba(255, 211, 43, 0.1) 100%);
    border-radius: 8px;
    color: var(--qboid-yellow);
    font-size: 14px;
    font-weight: 600;
    animation: pulse-glow 1.5s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 10px rgba(255, 211, 43, 0.2);
        opacity: 0.9;
    }
    50% {
        box-shadow: 0 0 20px rgba(255, 211, 43, 0.4);
        opacity: 1;
    }
}

/* Workflow Previews */
.workflow-previews {
    margin-top: 20px;
}

.workflow-previews-full-width {
    margin-top: 20px;
    padding: 20px 0;
    /* Break out to full main-content width */
    width: 100vw;
    position: relative;
    left: 50%;
    right: 50%;
    margin-left: -50vw;
    margin-right: -50vw;
    /* Add padding to account for sidebar and balance */
    padding-left: 210px;
    padding-right: 210px;
    box-sizing: border-box;
}

.previews-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    max-width: 100%;
    padding: 0 24px;
    margin: 0 auto;
}

.workflow-preview-item {
    background-color: var(--qboid-gray);
    border-radius: 12px;
    padding: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    transition: transform 0.2s, box-shadow 0.2s;
    flex: 0 0 auto;
}

.workflow-preview-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
}

.workflow-preview-frame {
    width: 360px;
    height: 655px;
    border: none;
    border-radius: 8px;
    background-color: white;
    display: block;
}

/* Streaming cursor animation */
.message.streaming .cursor {
    display: inline-block;
    color: var(--qboid-yellow);
    animation: blink 1s infinite;
    margin-left: 2px;
}

@keyframes blink {
    0%, 49% {
        opacity: 1;
    }
    50%, 100% {
        opacity: 0;
    }
}