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

:root {
    --primary-color: #0066cc;
    --accent-color: #00cc66;
    --danger-color: #cc0000;
    --bg-dark: #1a1a1a;
    --bg-light: #f5f5f5;
    --surface-1: #ffffff;
    --surface-2: #f9f9f9;
    --text-primary: #333333;
    --text-secondary: #666666;
    --border-color: #e0e0e0;
    --code-bg: #f5f5f5;
    --code-keyword: #0066cc;
    --code-string: #bb3333;
    --code-comment: #008000;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-dark: #0d0d0d;
        --bg-light: #1a1a1a;
        --surface-1: #262626;
        --surface-2: #1f1f1f;
        --text-primary: #e0e0e0;
        --text-secondary: #b0b0b0;
        --border-color: #404040;
        --code-bg: #1e1e1e;
        --code-keyword: #4da6ff;
        --code-string: #ff6b6b;
        --code-comment: #4caf50;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-light);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: var(--bg-light);
}

/* Header */
.header {
    background: var(--surface-1);
    border-bottom: 1px solid var(--border-color);
    padding: 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.tagline {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem;
    gap: 1.5rem;
}

/* Toolbar */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    background: var(--surface-1);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.toolbar-left,
.toolbar-right {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.language-select {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--surface-2);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.language-select:hover {
    border-color: var(--primary-color);
}

.language-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: #0052a3;
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    background: var(--surface-2);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--surface-1);
    border-color: var(--text-secondary);
}

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

.btn-accent:hover {
    background: #00b84d;
    box-shadow: 0 4px 12px rgba(0, 204, 102, 0.3);
}

/* Share Container */
.share-container {
    animation: slideDown 0.3s ease;
    background: var(--surface-1);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--accent-color);
}

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

.share-box {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.share-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.share-input-group {
    display: flex;
    gap: 0.5rem;
}

.share-link-input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: var(--surface-2);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    color: var(--text-primary);
    word-break: break-all;
}

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

/* Editor Container */
.editor-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    flex: 1;
    min-height: 500px;
    background: var(--surface-1);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.divider {
    display: none;
    width: 1px;
    background: var(--border-color);
}

.editor-panel,
.preview-panel {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--surface-2);
}

.panel-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.char-count,
.file-type {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Code Input & Preview */
.code-input {
    flex: 1;
    padding: 1rem;
    background: var(--code-bg);
    color: var(--text-primary);
    border: none;
    font-family: 'Courier New', 'Monaco', monospace;
    font-size: 14px;
    line-height: 1.6;
    resize: none;
    white-space: pre;
    overflow-wrap: normal;
    word-wrap: normal;
    tab-size: 4;
}

.code-input:focus {
    outline: none;
    background: var(--surface-1);
}

.code-input::selection {
    background: var(--primary-color);
    color: white;
}

.code-preview {
    flex: 1;
    padding: 1rem;
    background: var(--code-bg);
    color: var(--text-primary);
    margin: 0;
    font-family: 'Courier New', 'Monaco', monospace;
    font-size: 14px;
    line-height: 1.6;
    overflow: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* Syntax Highlighting */
.keyword { color: var(--code-keyword); }
.string { color: var(--code-string); }
.comment { color: var(--code-comment); }

/* Footer */
.footer {
    background: var(--surface-1);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .editor-container {
        grid-template-columns: 1fr;
        min-height: 600px;
    }

    .divider {
        display: block;
    }

    .toolbar {
        flex-direction: column;
    }

    .toolbar-left,
    .toolbar-right {
        width: 100%;
        justify-content: stretch;
    }

    .language-select,
    .btn {
        flex: 1;
    }
}

@media (max-width: 768px) {
    .main-content {
        padding: 1rem;
    }

    .header {
        padding: 1.5rem;
    }

    .logo {
        font-size: 1.5rem;
    }

    .toolbar {
        gap: 0.5rem;
    }

    .panel-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .toolbar-right {
        width: 100%;
    }

    .btn {
        flex: 1;
        font-size: 0.85rem;
        padding: 0.6rem 1rem;
    }

    .editor-container {
        min-height: 800px;
    }

    .code-input,
    .code-preview {
        font-size: 12px;
    }
}

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

::-webkit-scrollbar-track {
    background: var(--surface-2);
}

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

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

/* Print Styles */
@media print {
    .header,
    .toolbar,
    .share-container,
    .footer {
        display: none;
    }

    .editor-container {
        border: none;
        background: white;
        min-height: auto;
    }

    .code-preview {
        padding: 0;
    }
}