:root {
    --primary-color: #10a37f;
    --primary-hover: #0d8f6f;
    --secondary-color: #666666;
    --success-color: #10a37f;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #ffffff;
    --text-color: #1a1a1a;
    --border-color: #e5e7eb;
    --input-bg: #ffffff;
    --placeholder-color: #9ca3af;
    --message-user-bg: #f3f4f6;
    --message-assistant-bg: #ffffff;
    --header-bg: #ffffff;
    --chat-bg: #ffffff;
    
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --border-radius-sm: 6px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --transition-speed: 0.2s;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

[data-theme="dark"] {
    --bg-color: #0f0f0f;
    --text-color: #e3e3e3;
    --border-color: #2e2e2e;
    --input-bg: #1a1a1a;
    --placeholder-color: #6b7280;
    --message-user-bg: #1e293b;
    --message-assistant-bg: #1a1a1a;
    --header-bg: #0f0f0f;
    --chat-bg: #0f0f0f;
}

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

body {
    font-family: var(--font-primary);
    color: var(--text-color);
    background: var(--bg-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.chatgpt-container {
    display: flex;
    flex-direction: column;
    height: 600px;
    background: var(--bg-color);
    max-width: 1000px;
    margin: 2rem auto;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    font-family: var(--font-primary);
    overflow: hidden;
    transition: all var(--transition-speed) ease;
}

.chatgpt-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--header-bg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(10px);
}

.chatgpt-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-color);
}

.chatgpt-brand svg {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
}

.chatgpt-header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.model-selector {
    position: relative;
}

#chatgpt-model {
    padding: 0.5rem 2.5rem 0.5rem 1rem;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-color);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    transition: all var(--transition-speed) ease;
    background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%23666666' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 10px;
}

#chatgpt-model:hover {
    border-color: var(--primary-color);
}

#chatgpt-model:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 163, 127, 0.1);
}

.chatgpt-export,
.chatgpt-reset {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--secondary-color);
    padding: 0.5rem;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chatgpt-export:hover,
.chatgpt-reset:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
    background: rgba(16, 163, 127, 0.05);
}

.chatgpt-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: var(--chat-bg);
}

.message {
    display: flex;
    gap: 0.75rem;
    padding: 1rem;
    border-radius: var(--border-radius-md);
    animation: messageSlide 0.3s ease-out;
    max-width: 85%;
}

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

.message.user {
    background-color: var(--message-user-bg);
    margin-left: auto;
    flex-direction: row-reverse;
}

.message.assistant {
    background-color: var(--message-assistant-bg);
    border: 1px solid var(--border-color);
    margin-right: auto;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

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

.message.assistant .message-avatar {
    background: var(--border-color);
    color: var(--secondary-color);
}

.message-content {
    flex: 1;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.message-meta {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--secondary-color);
}

.message-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.message:hover .message-actions {
    opacity: 1;
}

.message-action-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--secondary-color);
    font-size: 0.75rem;
    cursor: pointer;
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    gap: 0.375rem;
    transition: all var(--transition-speed) ease;
}

.message-action-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(16, 163, 127, 0.05);
}

.message-action-btn svg {
    width: 14px;
    height: 14px;
}

.chatgpt-input {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-color);
}

.input-wrapper {
    position: relative;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    background: var(--input-bg);
    transition: all var(--transition-speed) ease;
}

.input-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 163, 127, 0.1);
}

#chatgpt-prompt {
    width: 100%;
    min-height: 52px;
    max-height: 200px;
    padding: 14px 50px 14px 16px;
    border: none;
    background: transparent;
    color: var(--text-color);
    resize: none;
    font-size: 1rem;
    line-height: 1.5;
    font-family: var(--font-primary);
}

#chatgpt-prompt::placeholder {
    color: var(--placeholder-color);
}

#chatgpt-prompt:focus {
    outline: none;
}

#chatgpt-submit {
    position: absolute;
    right: 8px;
    bottom: 8px;
    width: 36px;
    height: 36px;
    border: none;
    background: var(--primary-color);
    cursor: pointer;
    padding: 0;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-speed) ease;
}

#chatgpt-submit:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: scale(1.05);
}

#chatgpt-submit:active:not(:disabled) {
    transform: scale(0.95);
}

#chatgpt-submit svg {
    width: 20px;
    height: 20px;
    color: white;
}

#chatgpt-submit:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--secondary-color);
}

.input-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--secondary-color);
}

.save-indicator {
    display: none;
    align-items: center;
    gap: 0.375rem;
    color: var(--success-color);
}

.save-indicator svg {
    width: 14px;
    height: 14px;
}

.typing-indicator {
    display: flex;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--message-assistant-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    margin-right: auto;
    align-items: center;
    max-width: 85%;
    animation: messageSlide 0.3s ease-out;
}

.typing-dots {
    display: flex;
    gap: 0.375rem;
    align-items: center;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background: var(--secondary-color);
    border-radius: 50%;
    animation: typingDot 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(1) {
    animation-delay: -0.32s;
}

.typing-dot:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes typingDot {
    0%, 80%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    height: 100%;
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.empty-state-icon {
    color: var(--border-color);
}

.empty-state-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
}

.empty-state-text {
    max-width: 400px;
    color: var(--secondary-color);
    line-height: 1.6;
    margin: 0;
}

.quick-prompts {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    margin-top: 1rem;
}

.quick-prompt {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quick-prompt:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.quick-prompt svg {
    width: 16px;
    height: 16px;
}

.export-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    z-index: 100;
}

.export-option {
    display: block;
    width: 100%;
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: none;
    text-align: left;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-color);
    transition: background-color var(--transition-speed) ease;
}

.export-option:hover {
    background-color: var(--message-user-bg);
}

/* Scrollbar styling */
.chatgpt-messages::-webkit-scrollbar {
    width: 6px;
}

.chatgpt-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chatgpt-messages::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 3px;
}

.chatgpt-messages::-webkit-scrollbar-thumb:hover {
    background-color: var(--secondary-color);
}

/* Markdown content styling */
.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4,
.message-content h5,
.message-content h6 {
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
    line-height: 1.25;
}

.message-content h1:first-child,
.message-content h2:first-child,
.message-content h3:first-child {
    margin-top: 0;
}

.message-content p {
    margin-bottom: 1rem;
    line-height: 1.6;
}

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

.message-content pre {
    margin: 1rem 0;
    padding: 1rem;
    overflow-x: auto;
    background: var(--bg-color);
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
}

.message-content code {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    padding: 0.125rem 0.375rem;
    background-color: rgba(0, 0, 0, 0.05);
    border-radius: 3px;
}

.message-content pre code {
    padding: 0;
    background-color: transparent;
}

.message-content ul,
.message-content ol {
    margin: 1rem 0;
    padding-left: 2rem;
}

.message-content li {
    margin: 0.5rem 0;
}

.message-content blockquote {
    margin: 1rem 0;
    padding-left: 1rem;
    border-left: 3px solid var(--primary-color);
    color: var(--secondary-color);
}

.message-content a {
    color: var(--primary-color);
    text-decoration: none;
}

.message-content a:hover {
    text-decoration: underline;
}

.message-content table {
    margin: 1rem 0;
    border-collapse: collapse;
    width: 100%;
    overflow-x: auto;
    display: block;
}

.message-content th,
.message-content td {
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    text-align: left;
}

.message-content th {
    background-color: var(--message-user-bg);
    font-weight: 600;
}

.message-content img {
    max-width: 100%;
    height: auto;
    margin: 1rem 0;
    border-radius: var(--border-radius-sm);
}

/* Responsive design */
@media (max-width: 768px) {
    .chatgpt-container {
        height: 100vh;
        max-height: none;
        margin: 0;
        border-radius: 0;
        border: none;
    }
    
    .chatgpt-header {
        padding: 1rem;
    }
    
    .chatgpt-brand span {
        display: none;
    }
    
    .message {
        max-width: 95%;
    }
    
    .quick-prompts {
        flex-direction: column;
        width: 100%;
    }
    
    .quick-prompt {
        width: 100%;
        justify-content: center;
    }
}

/* Loading animation */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading {
    animation: spin 1s linear infinite;
}

/* Focus styles for accessibility */
button:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .chatgpt-header,
    .chatgpt-input,
    .message-actions,
    .empty-state {
        display: none;
    }
    
    .chatgpt-messages {
        height: auto;
        overflow: visible;
    }
    
    .message {
        max-width: 100%;
        page-break-inside: avoid;
    }
}



/* Usage Banner Styles */
.chatgpt-usage-banner {
    display: none;
    padding: 0.75rem 1.5rem;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
}

.usage-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    font-size: 0.875rem;
}

.usage-stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.usage-label {
    color: var(--secondary-color);
}

.usage-value {
    font-weight: 600;
    color: var(--text-color);
}

.usage-bar {
    flex: 1;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}

.usage-bar-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.usage-info.usage-low .usage-value {
    color: var(--warning-color);
}

.usage-info.usage-low .usage-bar-fill {
    background: var(--warning-color);
}

.usage-info.usage-error {
    background: rgba(239, 68, 68, 0.1);
    padding: 1rem;
    border-radius: var(--border-radius-sm);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.usage-message {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--danger-color);
    font-weight: 500;
}

.usage-message svg {
    width: 20px;
    height: 20px;
}

/* Animations for usage updates */
@keyframes usageUpdate {
    0% {
        background-color: rgba(16, 163, 127, 0.1);
    }
    100% {
        background-color: transparent;
    }
}

.usage-info.updated {
    animation: usageUpdate 1s ease-out;
}