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

:root {
    --dos-blue: #0000AA;
    --dos-black: #000000;
    --dos-white: #AAAAAA;
    --dos-bright: #FFFFFF;
    --dos-green: #00AA00;
    --dos-amber: #FFAA00;
    --dos-red: #AA0000;
    --dos-cyan: #00AAAA;
    --dos-yellow: #FFFF55;
    --dos-bright-blue: #5555FF;
}

body {
    background: var(--dos-black);
    color: var(--dos-white);
    font-family: 'VT323', monospace;
    font-size: 16px;
    line-height: 1.4;
    min-height: 100vh;
    overflow-x: hidden;
}

#app {
    max-width: 900px;
    margin: 0 auto;
    padding: 0;
}

/* Title Bar */
#title-bar {
    background: var(--dos-blue);
    color: var(--dos-bright);
    padding: 4px 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 20px;
    letter-spacing: 1px;
    user-select: none;
}

#title-text {
    font-weight: normal;
}

#blink-cursor {
    animation: blink 1s step-end infinite;
    margin-left: 4px;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

#window-buttons {
    display: flex;
    gap: 6px;
}

.win-btn {
    background: var(--dos-white);
    color: var(--dos-blue);
    padding: 0 5px;
    cursor: pointer;
    font-size: 16px;
    line-height: 1.2;
}

.win-btn:hover {
    background: var(--dos-bright);
}

.close-btn:hover {
    background: var(--dos-red);
    color: var(--dos-bright);
}

/* Terminal Area */
#terminal {
    background: var(--dos-black);
    padding: 2px 8px;
    min-height: calc(100vh - 60px);
}

#ascii-border-top, #ascii-border-bottom {
    color: var(--dos-bright-blue);
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    user-select: none;
}

#main-content {
    padding: 8px 16px;
    border-left: none;
    border-right: none;
}

/* Status Line */
.prompt {
    color: var(--dos-bright);
    font-weight: bold;
}

#status-text {
    color: var(--dos-green);
}

/* Drop Zone */
#drop-zone {
    margin: 12px 0;
    padding: 10px;
    border: 2px dashed var(--dos-bright-blue);
    cursor: pointer;
    text-align: center;
    color: var(--dos-cyan);
    font-size: 18px;
    transition: none;
    outline: none;
    user-select: none;
    position: relative;
}

#drop-zone:hover, #drop-zone.drag-over {
    background: rgba(85, 85, 255, 0.1);
    animation: crt-flicker 0.15s infinite;
}

@keyframes crt-flicker {
    0% { opacity: 1; }
    25% { opacity: 0.92; }
    50% { opacity: 1; }
    75% { opacity: 0.95; }
    100% { opacity: 1; }
}

#drop-zone:focus {
    border-color: var(--dos-yellow);
}

.drop-inner {
    line-height: 1.6;
    white-space: pre;
}

/* Progress Bar */
#progress-bar {
    margin: 8px 0;
    color: var(--dos-green);
}

#progress-blocks {
    color: var(--dos-yellow);
    letter-spacing: -1px;
}

/* Controls Panel */
#controls-panel {
    margin: 12px 0;
}

.panel-title {
    color: var(--dos-yellow);
    margin-bottom: 6px;
    font-size: 16px;
    user-select: none;
}

.control-row {
    margin: 4px 0;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
}

.label {
    color: var(--dos-bright);
    min-width: 140px;
    font-size: 16px;
}

.selector {
    display: flex;
    flex-wrap: wrap;
    gap: 2px;
}

.opt {
    padding: 1px 8px;
    cursor: pointer;
    color: var(--dos-white);
    user-select: none;
    font-size: 15px;
}

.opt:hover {
    background: var(--dos-blue);
    color: var(--dos-bright);
}

.opt.selected {
    background: var(--dos-cyan);
    color: var(--dos-black);
}

.slider-arrow {
    cursor: pointer;
    color: var(--dos-bright);
    padding: 0 4px;
    user-select: none;
    font-size: 16px;
}

.slider-arrow:hover {
    color: var(--dos-yellow);
}

.slider-bar {
    display: inline-block;
    width: 200px;
    height: 14px;
    background: #222;
    border: 1px solid var(--dos-white);
    position: relative;
    vertical-align: middle;
    overflow: hidden;
}

.slider-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: var(--fill, 50%);
    width: 4px;
    height: 100%;
    background: var(--dos-yellow);
}

#brightness-val, #contrast-val {
    color: var(--dos-yellow);
    min-width: 30px;
    display: inline-block;
    text-align: right;
}

.toggles {
    margin-top: 6px;
    gap: 16px;
}

.toggle-item {
    cursor: pointer;
    user-select: none;
    color: var(--dos-white);
}

.toggle-item:hover {
    color: var(--dos-bright);
}

.toggle-item .tval {
    color: var(--dos-red);
}

.toggle-item.active .tval {
    color: var(--dos-green);
}

/* Preview Area */
#preview-area {
    margin: 12px 0;
}

#preview-container {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.preview-box {
    flex: 1;
    min-width: 280px;
    max-width: 100%;
}

.preview-label {
    color: var(--dos-cyan);
    margin-bottom: 4px;
    font-size: 14px;
    text-align: center;
}

.canvas-wrap {
    position: relative;
    display: inline-block;
    width: 100%;
    text-align: center;
    background: #111;
    border: 1px solid #333;
}

.canvas-wrap canvas {
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
    max-width: 100%;
    display: block;
    margin: 0 auto;
}

/* Scanline Overlay */
#scanline-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        rgba(0, 0, 0, 0.3) 0px,
        rgba(0, 0, 0, 0.3) 1px,
        transparent 1px,
        transparent 3px
    );
    pointer-events: none;
    z-index: 2;
}

/* CRT Overlay */
#crt-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 3;
    background: radial-gradient(ellipse at center, transparent 60%, rgba(0,0,0,0.5) 100%);
    border-radius: 0;
}

/* Grid Overlay */
#grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 4;
    background:
        repeating-linear-gradient(90deg, rgba(100,100,100,0.15) 0px, rgba(100,100,100,0.15) 1px, transparent 1px, transparent 3px),
        repeating-linear-gradient(0deg, rgba(100,100,100,0.15) 0px, rgba(100,100,100,0.15) 1px, transparent 1px, transparent 3px);
}

/* Hex Panel */
#hex-panel {
    margin: 12px 0;
}

#hex-dump {
    background: #0a0a0a;
    border: 1px solid #333;
    padding: 8px;
    font-size: 13px;
    max-height: 220px;
    overflow-y: auto;
    color: var(--dos-green);
    line-height: 1.5;
    white-space: pre;
    font-family: 'VT323', monospace;
}

#hex-dump .offset {
    color: var(--dos-yellow);
}

#hex-dump .hex-bytes {
    color: var(--dos-green);
}

#hex-dump .ascii-col {
    color: var(--dos-cyan);
}

#hex-dump .mz-magic {
    color: var(--dos-bright);
    background: var(--dos-blue);
}

/* Export Panel */
#export-panel {
    margin: 12px 0;
}

.export-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.dos-btn {
    padding: 4px 14px;
    background: var(--dos-blue);
    color: var(--dos-bright);
    cursor: pointer;
    user-select: none;
    border: 1px solid var(--dos-bright-blue);
    font-family: 'VT323', monospace;
    font-size: 16px;
    transition: none;
}

.dos-btn:hover {
    background: var(--dos-cyan);
    color: var(--dos-black);
}

.dos-btn:active {
    background: var(--dos-bright);
    color: var(--dos-black);
}

/* Footer */
#footer {
    background: var(--dos-blue);
    color: var(--dos-white);
    padding: 4px 10px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 14px;
}

#footer a {
    color: var(--dos-yellow);
    text-decoration: none;
}

#footer a:hover {
    color: var(--dos-bright);
    text-decoration: underline;
}

/* Utility */
.hidden {
    display: none !important;
}

/* Typewriter effect */
.typewriter {
    overflow: hidden;
    border-right: none;
    animation: typewriter-reveal 0.5s steps(30) forwards;
}

@keyframes typewriter-reveal {
    from { max-width: 0; }
    to { max-width: 100%; }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 12px;
}
::-webkit-scrollbar-track {
    background: #111;
}
::-webkit-scrollbar-thumb {
    background: var(--dos-blue);
    border: 1px solid var(--dos-bright-blue);
}

/* CRT screen glow */
#app {
    box-shadow: 0 0 40px rgba(0, 170, 0, 0.05), inset 0 0 20px rgba(0, 0, 0, 0.3);
}

/* Responsive */
@media (max-width: 600px) {
    body { font-size: 14px; }
    #ascii-border-top, #ascii-border-bottom { display: none; }
    .label { min-width: 100px; font-size: 14px; }
    .opt { font-size: 13px; padding: 1px 5px; }
    .slider-bar { width: 120px; }
    #hex-dump { font-size: 11px; }
    #preview-container { flex-direction: column; }
    .dos-btn { font-size: 14px; padding: 3px 10px; }
    #main-content { padding: 4px 8px; }
    #footer { font-size: 12px; }
}