:root {
    --bg-color: #1a1a1a;
    --surface-color: #2a2a2a;
    --primary-color: #4f86f7;
    --text-color: #e0e0e0;
    --text-muted-color: #9e9e9e;
    --border-color: #444;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --border-radius: 8px;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

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

html, body {
    height: 100%;
}

body {
    font-family: var(--font-family), serif;
    font-size: 16px;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
}

.main-container {
    display: flex;
    flex-grow: 1;
    gap: 1.5rem;
    padding: 1.5rem;
    overflow: hidden;
}

.controls {
    flex: 0 0 380px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding: 1.5rem;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow-y: auto;
}

.display-area {
    flex-grow: 1;
    padding: 1.5rem;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow-y: auto;
}

h1 {
    font-size: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-muted-color);
}

textarea, input[type="number"] {
    width: 100%;
    padding: 0.75rem;
    font-family: inherit;
    font-size: 1rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-color);
    transition: border-color 0.2s, box-shadow 0.2s;
}

textarea:focus, input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 134, 247, 0.3);
}

textarea {
    min-height: 150px;
    resize: vertical;
    flex-grow: 1;
}

fieldset {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}

legend {
    padding: 0 0.5rem;
    font-weight: 600;
    color: var(--text-muted-color);
}

.range-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    margin: 0.25rem 0;
    background-color: var(--bg-color);
    border-radius: var(--border-radius);
}

.range-inputs {
    display: flex;
    gap: 0.5rem;
    flex-grow: 1;
}

.range-color-indicator {
    width: 1rem;
    height: 1rem;
    border-radius: 50%;
    flex-shrink: 0;
}

.remove-btn {
    background: none;
    border: none;
    color: var(--text-muted-color);
    cursor: pointer;
    font-size: 1.5rem;
    line-height: 1;
    padding: 0.25rem;
    border-radius: 50%;
    transition: color 0.2s, background-color 0.2s;
}

.remove-btn:hover {
    color: #ff5c5c;
    background-color: rgba(255, 92, 92, 0.1);
}

.add-btn {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.add-btn:hover {
    background-color: #3a70d5;
}

#output-container {
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: "SF Mono", "Fira Code", "Menlo", monospace;
    font-size: 0.95rem;
}

.position-marker {
    background-color: rgba(255, 255, 0, 0.4);
    outline: 1px solid rgba(255, 255, 0, 0.8);
    border-radius: 2px;
    position: relative;
}

.position-marker::before {
    content: '▼';
    position: absolute;
    top: -1.2em;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 0, 0.8);
    font-size: 0.8em;
}

.highlight {
    padding: 0.1em 0;
    margin: -0.1em 0;
    border-radius: 3px;
}

@media (max-width: 900px) {
    .main-container {
        flex-direction: column;
        padding: 1rem;
        gap: 1rem;
    }

    .controls {
        flex: 0 0 auto;
    }
}

.inclusive-toggle {
    display: flex;
    align-items: center;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-muted-color);
    user-select: none;
}

.inclusive-toggle-checkbox {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.toggle-switch {
    position: relative;
    width: 40px;
    height: 22px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 11px;
    transition: background-color 0.2s ease;
}

.toggle-switch::before {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--text-muted-color);
    top: 2px;
    left: 2px;
    transition: transform 0.2s ease, background-color 0.2s ease;
}

.inclusive-toggle-checkbox:checked + .toggle-switch {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.inclusive-toggle-checkbox:checked + .toggle-switch::before {
    background-color: white;
    transform: translateX(18px);
}

.inclusive-toggle-checkbox:focus-visible + .toggle-switch {
    box-shadow: 0 0 0 3px rgba(79, 134, 247, 0.3);
}

.global-toggle-container {
    margin-bottom: 1rem;
    padding-left: 0.25rem;
}