:root {
    --bg-color: #0A0A0A;
    --panel-bg: #141414;
    --border-color: #333333;
    --text-primary: #E5E5E5;
    --text-secondary: #A3A3A3;
    --accent: #10B981;
    --accent-hover: #059669;
    --danger: #EF4444;
    
    --font-ui: system-ui, -apple-system, sans-serif;
    --font-mono: 'Courier New', Courier, monospace;
}

body.theme-light {
    --bg-color: #F3F4F6;
    --panel-bg: #FFFFFF;
    --border-color: #E5E7EB;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --accent: #10B981;
    --accent-hover: #059669;
}

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

body {
    background: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-ui);
    height: 100vh;
    overflow: hidden;
}

.display-none { display: none !important; }

.app-layout {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 380px;
    background: var(--panel-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.brand {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.terminal-icon {
    color: var(--accent);
    font-size: 1.5rem;
}

.brand h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.brand .pro {
    color: var(--accent);
}

.tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    background: none;
    border: none;
    padding: 1rem 0;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.scroll-area {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
}

.scroll-area::-webkit-scrollbar { width: 6px; }
.scroll-area::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }

.control-section { display: none; }
.control-section.active { display: block; animation: fadeIn 0.3s; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.form-group { margin-bottom: 1.5rem; }
.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

input[type="text"], textarea, select {
    width: 100%;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem;
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
}
input[type="text"]:focus, textarea:focus, select:focus {
    border-color: var(--accent);
}

textarea { resize: vertical; }

.two-col {
    display: flex;
    gap: 1rem;
}
.col { flex: 1; }

.slider-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
input[type="range"] {
    flex: 1;
    accent-color: var(--accent);
}
.val-badge {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    min-width: 3rem;
    text-align: center;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 6px;
    padding: 2rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}
.upload-area:hover, .upload-area.dragover {
    border-color: var(--accent);
    background: rgba(16, 185, 129, 0.05);
}
.upload-area i {
    font-size: 2rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}
.upload-area p span { color: var(--accent); font-weight: 600; }

.settings-divider {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 1px;
    margin: 2rem 0 1rem;
    display: flex;
    align-items: center;
}
.settings-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
    margin-left: 1rem;
}

/* Toggles */
.toggles {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}
.toggle-switch {
    display: flex;
    align-items: center;
    cursor: pointer;
    gap: 0.75rem;
}
.toggle-switch input { display: none; }
.slider {
    position: relative;
    width: 36px;
    height: 20px;
    background: var(--border-color);
    border-radius: 20px;
    transition: 0.3s;
}
.slider::before {
    content: "";
    position: absolute;
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background: var(--text-primary);
    border-radius: 50%;
    transition: 0.3s;
}
.toggle-switch input:checked + .slider { background: var(--accent); }
.toggle-switch input:checked + .slider::before { transform: translateX(16px); background: #fff; }
.label-text { font-size: 0.9rem; font-weight: 500; }

/* Action Grid */
.action-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.action-btn {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s;
}
.action-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Preview Area */
.preview-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: var(--bg-color);
}

.preview-header {
    height: 72px;
    padding: 0 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--panel-bg);
}

.preview-title {
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: color 0.2s;
}
.icon-btn:hover { color: var(--accent); }

.canvas-wrapper {
    flex: 1;
    overflow: auto;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.canvas-wrapper::-webkit-scrollbar { width: 10px; height: 10px; }
.canvas-wrapper::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 5px; }

#ascii-output {
    font-family: var(--font-mono);
    line-height: 1;
    white-space: pre;
    color: var(--accent);
    /* For HTML output styles, we apply inline styles where needed */
}

/* Gallery Modal */
.modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}
.modal-content {
    background: var(--panel-bg);
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}
.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}
.close-btn:hover { color: var(--danger); }
.gallery-grid {
    padding: 1.5rem;
    overflow-y: auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
}

.gallery-item {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}
.gallery-item:hover { border-color: var(--accent); }
.gallery-item i { font-size: 2rem; color: var(--text-secondary); margin-bottom: 0.5rem; }
.gallery-item p { font-size: 0.8rem; font-weight: 600; }