:root {
    --color-bg-dark: #050505;
    --color-bg-light: #F0F0F0;
    
    --color-primary-dark: #00FF41; /* CRT Green */
    --color-primary-light: #000000;
    
    --color-secondary-dark: #FFFFFF;
    --color-secondary-light: #333333;
    
    --color-muted-dark: #008F11;
    --color-muted-light: #888888;
    
    --color-error: #FF003C;
    
    --border-dark: #00FF41;
    --border-light: #000000;
    
    --glow-dark: 0 0 10px rgba(0, 255, 65, 0.4), inset 0 0 10px rgba(0, 255, 65, 0.2);
    --glow-light: none;

    --font-mono: 'Courier New', Courier, 'Lucida Sans Typewriter', 'Lucida Typewriter', monospace;
}

/* Theme defaults (dark) */
body.theme-dark {
    --bg-color: var(--color-bg-dark);
    --primary-color: var(--color-primary-dark);
    --secondary-color: var(--color-secondary-dark);
    --muted-color: var(--color-muted-dark);
    --border-color: var(--border-dark);
    --glow: var(--glow-dark);
}

body.theme-light {
    --bg-color: var(--color-bg-light);
    --primary-color: var(--color-primary-light);
    --secondary-color: var(--color-secondary-light);
    --muted-color: var(--color-muted-light);
    --border-color: var(--border-light);
    --glow: var(--glow-light);
}

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

body {
    background-color: var(--bg-color);
    color: var(--primary-color);
    font-family: var(--font-mono);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
}

/* CRT Effects for dark mode */
body.theme-dark .crt-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(circle, rgba(0,255,65,0.05) 0%, rgba(0,0,0,0.5) 100%);
    pointer-events: none;
    z-index: 9998;
}

body.theme-dark .scanlines {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(to bottom, rgba(255,255,255,0), rgba(255,255,255,0) 50%, rgba(0,0,0,0.2) 50%, rgba(0,0,0,0.2));
    background-size: 100% 4px;
    pointer-events: none;
    z-index: 9999;
}

.hide { display: none !important; }

/* Layout */
.app-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    height: 100vh;
    position: relative;
    z-index: 1;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 2rem;
}

body.theme-dark .app-header {
    text-shadow: 0 0 5px var(--primary-color);
}

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

.brand h1 {
    font-size: 1.5rem;
    font-weight: bold;
    letter-spacing: 2px;
}

.cursor {
    display: inline-block;
    width: 12px;
    height: 1.2em;
    background-color: var(--primary-color);
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* Workspace */
.workspace {
    display: flex;
    gap: 2rem;
    flex: 1;
    min-height: 0;
}

/* Sidebar */
.controls-panel {
    width: 320px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    overflow-y: auto;
    padding-right: 1rem;
}

.controls-panel::-webkit-scrollbar {
    width: 6px;
}
.controls-panel::-webkit-scrollbar-thumb {
    background: var(--muted-color);
}

.control-group {
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    box-shadow: var(--glow);
    background: rgba(0, 0, 0, 0.4);
}
body.theme-light .control-group {
    background: rgba(255, 255, 255, 0.8);
}

.control-group h2 {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
}

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--border-color);
    padding: 2rem 1rem;
    text-align: center;
    cursor: pointer;
    margin-bottom: 1rem;
    transition: all 0.2s;
}

.upload-zone:hover, .upload-zone.dragover {
    background: var(--muted-color);
    color: var(--bg-color);
}

.upload-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.muted {
    font-size: 0.8rem;
    opacity: 0.7;
}

/* Form Controls */
.setting-item {
    margin-bottom: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.setting-item label {
    font-size: 0.9rem;
}

.slider-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    height: 1.5rem;
}

input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 2px;
    background: var(--muted-color);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 16px;
    width: 8px;
    background: var(--primary-color);
    margin-top: -7px;
    cursor: pointer;
}

.value-display {
    width: 3ch;
    text-align: right;
    font-size: 0.9rem;
}

.input-theme {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--primary-color);
    padding: 0.5rem;
    font-family: var(--font-mono);
    width: 100%;
    outline: none;
}
.input-theme:focus {
    box-shadow: var(--glow);
}
.input-theme option {
    background: var(--bg-color);
    color: var(--primary-color);
}

/* Custom Checkbox */
.toggle-group {
    flex-direction: row;
    align-items: center;
}
.toggle-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
}
.custom-checkbox {
    display: none;
}
.checkbox-box {
    width: 16px;
    height: 16px;
    border: 1px solid var(--border-color);
    display: inline-block;
    position: relative;
}
.custom-checkbox:checked + .checkbox-box::after {
    content: '';
    position: absolute;
    top: 2px; left: 2px; right: 2px; bottom: 2px;
    background: var(--primary-color);
}

/* Buttons */
.btn {
    font-family: var(--font-mono);
    padding: 0.6rem 1rem;
    cursor: pointer;
    border: none;
    font-size: 0.9rem;
    font-weight: bold;
    text-transform: uppercase;
    transition: all 0.2s;
    outline: none;
}
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.btn-primary {
    background: var(--primary-color);
    color: var(--bg-color);
}
.btn-primary:hover:not(:disabled) {
    box-shadow: 0 0 15px var(--primary-color);
}
.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--primary-color);
}
.btn-outline:hover:not(:disabled) {
    background: var(--muted-color);
    color: var(--bg-color);
}
.full-width { width: 100%; }
.flex-row { display: flex; gap: 0.5rem; }

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Output Panel */
.output-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    box-shadow: var(--glow);
    background: rgba(0, 0, 0, 0.4);
    min-width: 0;
}
body.theme-light .output-panel {
    background: rgba(255, 255, 255, 0.8);
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}
.output-header h2 {
    font-size: 1.1rem;
    color: var(--secondary-color);
}

.status {
    font-size: 0.8rem;
    animation: blink 2s infinite;
}
.status.active { color: var(--color-error); }

.canvas-container {
    flex: 1;
    overflow: auto;
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    background: transparent;
}

.canvas-container::-webkit-scrollbar {
    width: 8px; height: 8px;
}
.canvas-container::-webkit-scrollbar-thumb {
    background: var(--muted-color);
}

.ascii-pre {
    line-height: 1;
    white-space: pre;
    font-family: var(--font-mono);
    text-align: center;
    transform-origin: top left;
}

@media (max-width: 1024px) {
    .workspace {
        flex-direction: column;
    }
    .controls-panel {
        width: 100%;
        flex-direction: row;
        flex-wrap: wrap;
    }
    .control-group {
        flex: 1;
        min-width: 300px;
    }
    .app-container { height: auto; min-height: 100vh; }
    .output-panel { min-height: 60vh; }
}