:root {
    --bg: #0a0a0a;
    --bg-surface: #111111;
    --bg-elevated: #1a1a1a;
    --text-primary: #00ff41;
    --text-dim: #00cc33;
    --text-muted: #555;
    --glow: 0 0 10px rgba(0, 255, 65, 0.3), 0 0 40px rgba(0, 255, 65, 0.1);
    --glow-strong: 0 0 10px rgba(0, 255, 65, 0.5), 0 0 40px rgba(0, 255, 65, 0.2), 0 0 80px rgba(0, 255, 65, 0.1);
    --border: #222;
    --border-glow: rgba(0, 255, 65, 0.4);
    --accent: #00ff41;
}

[data-theme="amber"] {
    --text-primary: #ffb000;
    --text-dim: #cc8d00;
    --glow: 0 0 10px rgba(255, 176, 0, 0.3), 0 0 40px rgba(255, 176, 0, 0.1);
    --glow-strong: 0 0 10px rgba(255, 176, 0, 0.5), 0 0 40px rgba(255, 176, 0, 0.2);
    --border-glow: rgba(255, 176, 0, 0.4);
    --accent: #ffb000;
}

[data-theme="white"] {
    --text-primary: #e0e0e0;
    --text-dim: #aaa;
    --glow: 0 0 10px rgba(224, 224, 224, 0.15), 0 0 40px rgba(224, 224, 224, 0.05);
    --glow-strong: 0 0 10px rgba(224, 224, 224, 0.3), 0 0 40px rgba(224, 224, 224, 0.1);
    --border-glow: rgba(224, 224, 224, 0.3);
    --accent: #e0e0e0;
}

[data-theme="light"] {
    --bg: #f0efe9;
    --bg-surface: #e8e7e1;
    --bg-elevated: #dddcd6;
    --text-primary: #1a1a1a;
    --text-dim: #444;
    --text-muted: #999;
    --glow: none;
    --glow-strong: none;
    --border: #ccc;
    --border-glow: #999;
    --accent: #1a1a1a;
}

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

body {
    background: var(--bg);
    color: var(--text-primary);
    font-family: 'JetBrains Mono', 'Space Mono', 'Courier New', monospace;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Scanline overlay */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 0, 0, 0.03) 2px,
        rgba(0, 0, 0, 0.03) 4px
    );
    z-index: 9999;
}

#app {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* HEADER */
header {
    text-align: center;
    padding: 30px 0 20px;
}

.title {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 800;
    letter-spacing: -2px;
    text-shadow: var(--glow-strong);
    animation: flicker 4s infinite alternate;
}

.subtitle {
    font-size: clamp(0.7rem, 2vw, 0.9rem);
    color: var(--text-dim);
    font-weight: 300;
    margin-top: 6px;
    letter-spacing: 2px;
    text-transform: uppercase;
}

@keyframes flicker {
    0%, 96%, 100% { opacity: 1; }
    97% { opacity: 0.8; }
    98% { opacity: 1; }
    99% { opacity: 0.85; }
}

/* UPLOAD ZONE */
.upload-zone {
    max-width: 600px;
    margin: 40px auto;
    border: 2px dashed var(--border-glow);
    border-radius: 12px;
    padding: 60px 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-surface);
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--border-glow) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.upload-zone:hover::before,
.upload-zone.drag-over::before {
    opacity: 0.08;
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--text-primary);
    box-shadow: var(--glow);
    transform: scale(1.01);
}

.upload-zone.drag-over {
    animation: pulse-border 1s infinite;
}

@keyframes pulse-border {
    0%, 100% { box-shadow: var(--glow); }
    50% { box-shadow: var(--glow-strong); }
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.upload-text {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.upload-hint {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 300;
}

/* WORKSPACE */
.workspace {
    animation: fadeSlideIn 0.5s ease;
}

.workspace.hidden {
    display: none;
}

@keyframes fadeSlideIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* CONTROLS BAR */
.controls-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    padding: 16px 20px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    margin-bottom: 16px;
    align-items: center;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 80px;
}

.control-group label {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-dim);
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 6px;
}

.control-group .val {
    color: var(--text-primary);
    font-weight: 400;
}

.control-group input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 120px;
    height: 4px;
    background: var(--border);
    border-radius: 4px;
    outline: none;
    cursor: pointer;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--text-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--glow);
}

.control-group select {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 4px 8px;
    font-family: inherit;
    font-size: 0.75rem;
    cursor: pointer;
    outline: none;
}

.control-group select:focus {
    border-color: var(--accent);
}

.control-group input[type="text"] {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 4px 8px;
    font-family: inherit;
    font-size: 0.75rem;
    width: 140px;
    outline: none;
}

.control-group input[type="text"]:focus {
    border-color: var(--accent);
}

/* TOGGLE SWITCH */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 36px;
    height: 18px;
    cursor: pointer;
}

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

.toggle-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--border);
    border-radius: 18px;
    transition: 0.3s;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 12px;
    width: 12px;
    left: 3px;
    bottom: 3px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: 0.3s;
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--accent);
    box-shadow: var(--glow);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(18px);
    background: var(--bg);
}

.custom-charset-group.hidden {
    display: none;
}

/* OUTPUT AREA */
.output-wrapper {
    position: relative;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    min-height: 300px;
}

.ascii-output {
    padding: 16px;
    overflow: auto;
    max-height: 70vh;
    font-family: 'JetBrains Mono', monospace;
    white-space: pre;
    line-height: 1;
    letter-spacing: 0;
    animation: asciiRender 0.5s ease;
}

@keyframes asciiRender {
    from { opacity: 0; filter: blur(2px); }
    to { opacity: 1; filter: blur(0); }
}

.preview-thumb {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 80px;
    height: 80px;
    border-radius: 8px;
    overflow: hidden;
    border: 2px solid var(--border);
    z-index: 10;
    opacity: 0.8;
    transition: all 0.3s ease;
    cursor: pointer;
    background: var(--bg);
}

.preview-thumb:hover {
    opacity: 1;
    width: 160px;
    height: 160px;
    box-shadow: var(--glow);
}

.preview-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ACTION BAR */
.action-bar {
    display: flex;
    gap: 10px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.action-btn {
    background: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 18px;
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    letter-spacing: 0.5px;
}

.action-btn:hover {
    background: var(--bg-elevated);
    border-color: var(--accent);
    box-shadow: var(--glow);
    transform: translateY(-1px);
}

.action-btn:active {
    transform: translateY(0);
}

.action-btn-danger:hover {
    border-color: #ff4444;
    color: #ff4444;
    box-shadow: 0 0 10px rgba(255, 68, 68, 0.3);
}

/* TOAST */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--accent);
    color: var(--bg);
    padding: 10px 24px;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 700;
    z-index: 10000;
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.hidden {
    display: block;
    opacity: 0;
}

/* HIDDEN CANVAS */
.hidden-canvas {
    position: absolute;
    top: -9999px;
    left: -9999px;
}

/* FOOTER */
footer {
    text-align: center;
    padding: 30px 0 20px;
    font-size: 0.7rem;
    color: var(--text-muted);
}

footer a {
    color: var(--text-dim);
    text-decoration: none;
    border-bottom: 1px dashed var(--text-dim);
    transition: color 0.2s;
}

footer a:hover {
    color: var(--text-primary);
}

/* RESPONSIVE */
@media (max-width: 768px) {
    #app {
        padding: 12px;
    }

    .controls-bar {
        gap: 12px;
        padding: 12px;
    }

    .control-group input[type="range"] {
        width: 90px;
    }

    .upload-zone {
        padding: 40px 20px;
        margin: 20px auto;
    }

    .preview-thumb {
        width: 50px;
        height: 50px;
    }

    .preview-thumb:hover {
        width: 100px;
        height: 100px;
    }

    .action-bar {
        justify-content: center;
    }

    .action-btn {
        padding: 8px 14px;
        font-size: 0.75rem;
    }
}