:root {
    --bg-color: #121212;         /* Fondo principal muy oscuro */
    --sidebar-bg: #1e1e1e;       /* Fondo de paneles */
    --primary: #6366f1;          /* Color de acento (Indigo brillante) */
    --primary-hover: #818cf8;
    --text: #e4e4e7;             /* Texto casi blanco */
    --text-muted: #a1a1aa;       /* Texto gris suave */
    --border: #3f3f46;           /* Bordes sutiles */
    --input-bg: #27272a;         /* Fondo de inputs */
    --success: #10b981;
    --danger: #ef4444;
}

body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text);
    height: 100vh;
    overflow: hidden;
    color-scheme: dark; /* Ajusta scrollbars y elementos nativos */
}

.app-container {
    display: grid;
    grid-template-columns: 280px 1fr 300px;
    height: 100vh;
}

/* Sidebar General */
.sidebar, .palette-sidebar {
    background: var(--sidebar-bg);
    padding: 20px;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    box-shadow: 2px 0 10px rgba(0,0,0,0.3);
}

.palette-sidebar {
    border-right: none;
    border-left: 1px solid var(--border);
}

h1 { 
    margin-top: 0; 
    font-size: 1.4rem; 
    color: var(--primary); 
    text-transform: uppercase; 
    letter-spacing: 1px;
}

h3 {
    color: var(--text);
    border-bottom: 2px solid var(--border);
    padding-bottom: 10px;
}

hr { border: 0; border-top: 1px solid var(--border); margin: 20px 0; width: 100%; }

/* Controles */
.control-group { margin-bottom: 18px; }
.control-group label { 
    display: block; 
    font-size: 0.85rem; 
    font-weight: 500; 
    margin-bottom: 8px; 
    color: var(--text-muted); 
}

/* Inputs y Selects Estilizados */
input[type="number"], select {
    width: 100%; 
    padding: 10px; 
    background: var(--input-bg);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 6px; 
    box-sizing: border-box;
    font-family: inherit;
    transition: 0.2s;
}

input[type="number"]:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

/* Checkbox y Radio */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.radio-group { display: flex; gap: 15px; font-size: 0.9rem; color: var(--text); }
.checkbox-row { display: flex; align-items: center; gap: 10px; cursor: pointer; }
.checkbox-row label { margin: 0; cursor: pointer; color: var(--text); }

/* Opción Circular (Override del estilo inline del HTML) */
#circularOptionZone {
    background: #2d2d35 !important; 
    border: 1px solid var(--primary);
    color: var(--text);
}

/* Botones */
.btn-upload {
    background: rgba(99, 102, 241, 0.1); 
    color: var(--primary); 
    text-align: center; 
    padding: 12px;
    border-radius: 8px; 
    cursor: pointer; 
    border: 1px dashed var(--primary);
    transition: 0.3s;
    font-weight: 600;
}
.btn-upload:hover { 
    background: rgba(99, 102, 241, 0.2); 
    border-style: solid;
}

.actions { display: grid; gap: 12px; margin-top: auto; }
button {
    padding: 12px; border: none; border-radius: 6px; cursor: pointer;
    font-weight: 600; color: white; transition: 0.2s;
    text-transform: uppercase; font-size: 0.8rem; letter-spacing: 0.5px;
}
.btn-primary { background: var(--primary); box-shadow: 0 4px 10px rgba(99, 102, 241, 0.3); }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); }

.btn-success { background: var(--success); }
.btn-success:hover { filter: brightness(1.1); }

.btn-danger { background: var(--danger); }
.btn-danger:hover { filter: brightness(1.1); }

/* Zona Principal */
.main-content {
    display: flex; flex-direction: column; 
    background: #09090b; /* Negro casi puro para contraste */
    position: relative; overflow: hidden;
}
.info-bar {
    background: var(--sidebar-bg); 
    padding: 10px 20px; 
    font-size: 0.85rem;
    border-bottom: 1px solid var(--border); 
    display: flex; gap: 15px;
    color: var(--text-muted);
}
.divider { color: var(--border); }

.preview-area {
    flex: 1; display: flex; justify-content: center; align-items: center;
    overflow: auto; position: relative; padding: 40px;
    /* Patrón de fondo oscuro */
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 20px 20px;
}

canvas#previewCanvas {
    box-shadow: 0 20px 50px rgba(0,0,0,0.7);
    background: white; /* El canvas base sigue siendo blanco para ver los colores reales */
    image-rendering: pixelated;
    max-width: 95%; max-height: 95%;
}
/* Si es modo circular, el fondo del canvas debe ser transparente */
canvas.no-shadow { box-shadow: none !important; background: transparent !important; }

/* 
   --------------------------------------------------------------
   MODIFICACIÓN LUPA: TRANSPARENCIAS ELIMINADAS
   -------------------------------------------------------------- 
*/
#magnifier {
    position: absolute; top: 20px; right: 20px;
    width: 220px; height: 220px;
    background: var(--sidebar-bg); 
    border: 2px solid var(--border);
    border-radius: 12px; 
    box-shadow: 0 10px 30px rgba(0,0,0,0.8);
    display: none; z-index: 100; pointer-events: none; overflow: hidden;
}

#magReticle {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    border: 2px solid #ef4444; 
    box-sizing: border-box; z-index: 101; 
    /* ELIMINADO: box-shadow con transparencia oscura */
    box-shadow: none;
}

#magCoords {
    position: absolute; bottom: 0; left: 0; width: 100%;
    /* CAMBIO: Fondo negro sólido */
    background: #000000; 
    color: var(--primary); 
    font-size: 11px; font-family: monospace;
    padding: 6px; text-align: center; border-top: 1px solid var(--border);
}

/* Lista Paleta */
.palette-list { padding-right: 5px; }
.color-row {
    display: flex; align-items: center; gap: 12px;
    padding: 8px; 
    border-bottom: 1px solid var(--border); 
    font-size: 0.85rem;
    background: rgba(255,255,255,0.02);
    margin-bottom: 4px; border-radius: 4px;
}
.color-row:hover { background: rgba(255,255,255,0.05); }

.color-row input[type="color"] {
    width: 30px; height: 30px; 
    border: none; padding: 0; 
    background: none; cursor: pointer;
    border-radius: 4px;
}
.color-details { 
    display: flex; flex-direction: column; 
    font-size: 0.8rem; color: var(--text-muted); 
}
.color-details span:first-child { color: var(--text); font-weight: 600; }

/* Loading */
.loading-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.85); 
    backdrop-filter: blur(5px);
    z-index: 1000;
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    color: var(--text);
}
.spinner {
    width: 50px; height: 50px; border: 4px solid #333;
    border-top: 4px solid var(--primary); border-radius: 50%;
    animation: spin 0.8s linear infinite; margin-bottom: 20px;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }