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

:root {
    --primary-color: #1966bb;
    --primary-color-hover: #145a9e;
    --primary-color-light: #2d7bc4;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-dark: #2d2d2d;
    --text-primary: #1a1a1a;
    --text-secondary: #6c757d;
    --text-light: #868e96;
    --border-color: #dee2e6;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Top Bar */
.top-bar {
    background-color: var(--bg-dark);
    color: white;
    height: 56px;
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-md);
    box-shadow: var(--shadow-sm);
    z-index: 100;
}

.top-bar-content {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.oracle-logo-img {
    height: 32px;
    width: auto;
    display: block;
    margin-right: var(--spacing-md);
}

.oracle-logo {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-color-light) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 18px;
    color: white;
}

.app-title {
    font-weight: 600;
    font-size: 16px;
}

.top-bar-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.icon-btn {
    background: none;
    border: none;
    color: currentColor;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.icon-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Main Container */
.main-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: var(--spacing-md);
    gap: var(--spacing-md);
}

.sidebar-header {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.new-chat-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    transition: all 0.2s;
}

.new-chat-btn svg {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

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

.search-container {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: var(--spacing-sm);
    color: var(--text-secondary);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-sm) 32px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    font-size: 14px;
    color: var(--text-primary);
    transition: border-color 0.2s;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}


.chat-history {
    flex: 1;
    overflow-y: auto;
    margin-top: var(--spacing-xs);
}

.history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
}

.history-accordion {
    margin-top: var(--spacing-xs);
}

.history-accordion-summary {
    padding: var(--spacing-sm);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    list-style: none;
    user-select: none;
}

.history-accordion-summary::-webkit-details-marker {
    display: none;
}

.history-accordion-summary::marker {
    display: none;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) 0;
}

.chat-history-item {
    margin-bottom: var(--spacing-xs);
}

.history-item-summary {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background-color 0.2s;
    position: relative;
    list-style: none;
    user-select: none;
}

.history-item-summary::-webkit-details-marker {
    display: none;
}

.history-item-summary::marker {
    display: none;
}

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

.chat-history-item.active .history-item-summary {
    background-color: var(--bg-primary);
    font-weight: 500;
}

.history-item-summary .icon-btn {
    opacity: 0;
    transition: opacity 0.2s;
}

.history-item-summary:hover .icon-btn {
    opacity: 1;
}

.chat-history-messages {
    padding: var(--spacing-sm) var(--spacing-md);
    margin-top: var(--spacing-xs);
    border-left: 2px solid var(--border-color);
    margin-left: var(--spacing-md);
}

.history-message-item {
    margin-bottom: var(--spacing-md);
    font-size: 13px;
    line-height: 1.5;
}

.history-message-item:last-child {
    margin-bottom: 0;
}

.history-message-user {
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.history-message-user strong {
    color: var(--primary-color);
    font-weight: 600;
}

.history-message-assistant {
    color: var(--text-secondary);
    padding-left: var(--spacing-sm);
}

.history-message-assistant strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Chat Options Popup */
.chat-options-popup {
    position: absolute;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xs);
    z-index: 1000;
    min-width: 180px;
    display: none;
}

.chat-options-popup.show {
    display: block;
}

.chat-option-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    color: var(--text-primary);
    transition: background-color 0.2s;
}

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

.chat-option-item svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.user-profile {
    margin-top: auto;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.user-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.terms-link {
    font-size: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--spacing-sm);
    display: block;
    transition: color 0.2s;
}

.terms-link:hover {
    color: var(--text-primary);
}

/* Chat Container */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    overflow: hidden;
    position: relative;
}

.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-primary);
}

.model-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
}

.model-name {
    color: var(--text-primary);
}

.chat-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.chat-actions .icon-btn {
    color: var(--text-secondary);
}

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

/* Messages Container */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.welcome-message {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

.welcome-message h2 {
    font-size: 24px;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.message {
    display: flex;
    gap: var(--spacing-md);
    animation: fadeIn 0.3s ease-in;
}

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

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 14px;
    font-weight: 600;
}

.message.user .message-avatar {
    background-color: var(--primary-color);
    color: white;
}

.message.assistant .message-avatar {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.message-content {
    flex: 1;
    max-width: 70%;
}

.message-bubble {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    line-height: 1.6;
    word-wrap: break-word;
}

.message.user .message-bubble {
    background-color: var(--primary-color);
    color: white;
    border-bottom-right-radius: var(--radius-sm);
}

.message.assistant .message-bubble {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-bottom-left-radius: var(--radius-sm);
}

.message-time {
    font-size: 12px;
    color: var(--text-light);
    margin-top: var(--spacing-xs);
    padding: 0 var(--spacing-sm);
}

/* Input Container */
.input-container {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-primary);
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    max-width: 100%;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
    transition: border-color 0.2s;
}

.input-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(25, 102, 187, 0.1);
}

.attach-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

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

.message-input {
    flex: 1;
    border: none;
    background: none;
    resize: none;
    font-size: 15px;
    font-family: inherit;
    color: var(--text-primary);
    padding: var(--spacing-sm);
    max-height: 200px;
    overflow-y: auto;
    outline: none;
}

.message-input::placeholder {
    color: var(--text-light);
}

.send-btn {
    background-color: var(--primary-color);
    border: none;
    color: white;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
    background-color: var(--primary-color-hover);
    transform: scale(1.05);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md);
    height: 48px;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 100%;
    font-size: 12px;
    color: var(--text-secondary);
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-link:hover {
    color: var(--text-primary);
}

.copyright {
    flex: 1;
    text-align: center;
}

.footer-links {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

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

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

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

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

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        width: 240px;
    }
    
    .message-content {
        max-width: 85%;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-xs);
        text-align: center;
    }
}

/* Loading Animation */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: var(--spacing-md);
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-light);
    animation: typing 1.4s infinite;
}

.typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.7;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}