:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --border-color: #ccc;
    --input-bg: #ffffff;
    --output-bg: #f5f5f5;
    --button-primary: #0066cc;
    --button-primary-hover: #0052a3;
    --success-bg: #d4edda;
    --success-border: #c3e6cb;
    --success-text: #155724;
    --error-bg: #f8d7da;
    --error-border: #f5c6cb;
    --error-text: #721c24;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --text-color: #e0e0e0;
        --border-color: #444;
        --input-bg: #2d2d2d;
        --output-bg: #2a2a2a;
        --button-primary: #4a9eff;
        --button-primary-hover: #357abd;
        --success-bg: #0f3429;
        --success-border: #1e5f3f;
        --success-text: #90ee90;
        --error-bg: #3d1a1a;
        --error-border: #5a2d2d;
        --error-text: #ffb3b3;
    }
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-height: calc(100dvh - 2rem);
}

.container h1 {
    margin: 0;
    text-align: center;
}

.app-footer {
    text-align: center;
    font-size: 0.8rem;
    opacity: 0.65;
    margin-top: 0.25rem;
}

.workspace {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex: 1 1 auto;
    min-height: 0;
}

.pane {
    display: flex;
    flex-direction: column;
    flex: 1 1 0;
    min-height: 0;
}

#editor, #previewFrame {
    flex: 1 1 0;
    min-height: 0;
    max-height: none;
    overflow-y: auto;
    overflow-x: auto;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    padding: 1rem;
    margin-bottom: 0;
    background-color: var(--input-bg);
    color: var(--text-color);
    transition: border-color 0.3s, background-color 0.3s;
}

#editor {
    resize: none;
    white-space: pre-wrap;
    font: inherit;
}

#editor:focus {
    outline: none;
    border-color: var(--button-primary);
}

#editor.drag-over {
    border-color: #28a745;
    background-color: rgba(40, 167, 69, 0.08);
}

#previewFrame {
    background: var(--output-bg);
    padding: 0;
}

@media (min-width: 900px) and (min-aspect-ratio: 5/4) {
    .workspace {
        flex-direction: row;
    }
}

.button-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.section.controls .button-group {
    justify-content: center;
}

button {
    padding: 0.8rem 1rem;
    border: none;
    border-radius: 0.4rem;
    background: var(--button-primary);
    color: white;
    cursor: pointer;
    font-size: 1rem;
    white-space: nowrap;
    transition: background-color 0.2s;
}

button:hover {
    background: var(--button-primary-hover);
}

button.secondary {
    background: #6c757d;
}

button.secondary:hover {
    background: #5a6268;
}

button.danger {
    background: #dc3545;
}

button.danger:hover {
    background: #c82333;
}

button.success {
    background: #28a745;
}

button.success:hover {
    background: #218838;
}

h2 {
    margin: 0 0 0.5rem 0;
    font-size: 1.2rem;
}

.success-message {
    color: var(--success-text);
    background-color: var(--success-bg);
    border: 1px solid var(--success-border);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    display: none;
    margin-top: 0.5rem;
}

.error-message {
    color: var(--error-text);
    background-color: var(--error-bg);
    border: 1px solid var(--error-border);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    display: none;
    margin-top: 0.5rem;
}

kbd {
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 3px;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 2px #fff inset;
    color: #495057;
    display: inline-block;
    font-family: monospace;
    font-size: 0.85em;
    font-weight: 700;
    line-height: 1;
    padding: 2px 4px;
    white-space: nowrap;
}

@media (prefers-color-scheme: dark) {
    kbd {
        background-color: #2d2d2d;
        border-color: #555;
        color: #e0e0e0;
        box-shadow: 0 1px 0 rgba(255, 255, 255, 0.1), 0 0 0 2px #2d2d2d inset;
    }
}

.mode-switches {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mode-switch {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: #28a745;
}

input:checked + .slider:before {
    transform: translateX(24px);
}

button i {
    margin-right: 0.5rem;
}

h1 i {
    margin-right: 0.5rem;
    color: var(--button-primary);
}

h2 i {
    margin-right: 0.5rem;
    color: #6c757d;
}

[data-tooltip] {
    position: relative;
}

[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    white-space: nowrap;
    z-index: 1000;
    margin-bottom: 5px;
}

[data-tooltip]:hover::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: rgba(0, 0, 0, 0.9);
    z-index: 1000;
}

@media (prefers-color-scheme: dark) {
    [data-tooltip]:hover::after {
        background: rgba(255, 255, 255, 0.9);
        color: black;
    }

    [data-tooltip]:hover::before {
        border-top-color: rgba(255, 255, 255, 0.9);
    }
}

@media (max-width: 768px) {
    .button-group {
        flex-direction: column;
        align-items: stretch;
    }

    .mode-switches {
        margin-top: 0.5rem;
        justify-content: space-around;
    }

    [data-tooltip]:hover::after,
    [data-tooltip]:hover::before {
        display: none;
    }
}