:root {
    --primary: #2196F3;
    --primary-dark: #0D47A1;
    --secondary: #1E88E5;
    --dark: #0D003B;
    --muted: #9E9E9E;
    --accent: #FFC107;
    --bg: #ffffff;
    --card-bg: #f9f9f9;
    --border: #e0e0e0;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --radius: 8px;
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
}

.uel-container {
    max-width: 1100px;
    margin: 30px auto;
    padding: 20px;
    background: var(--bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.uel-header {
    margin-bottom: 20px;
    text-align: center;
    border-bottom: 1px solid var(--border);
    padding-bottom: 15px;
}

.uel-title {
    margin: 0;
    color: var(--dark);
    font-size: 28px;
}

.uel-sub {
    color: var(--muted);
    font-size: 14px;
    margin-top: 5px;
}

.uel-main {
    display: flex;
    gap: 25px;
}

.uel-side {
    width: 280px;
    flex-shrink: 0;
}

.uel-side label {
    font-weight: 600;
    color: var(--dark);
    display: block;
    margin-bottom: 8px;
}

.uel-dropdown {
    width: 100%;
    padding: 12px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg);
    font-size: 15px;
}

.uel-note {
    font-size: 13px;
    color: var(--muted);
    margin-top: 15px;
    padding: 10px;
    background: #e3f2fd;
    border-left: 3px solid var(--primary);
    border-radius: 4px;
}

.uel-calc-box {
    flex: 1;
    padding: 25px;
    border-radius: var(--radius);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    /* General color is set here, but we will override below for specificity */
    min-height: 400px;
    display: flex;
    flex-direction: column;
}

.uel-welcome {
    text-align: center;
    margin-top: 50px;
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
}

.uel-calc-box h3 {
    margin-top: 0;
    margin-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    padding-bottom: 10px;
}

.uel-field {
    width: 100%;
    padding: 10px 12px;
    margin: 8px 0;
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.5);
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    font-size: 15px;
}

.uel-field::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.uel-field:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.2);
}

.uel-row {
    display: flex;
    gap: 15px;
    margin-bottom: 10px;
}

.uel-col {
    flex: 1;
}

.uel-button {
    background: var(--accent);
    color: var(--dark);
    border: none;
    padding: 12px 20px;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
    font-size: 16px;
    transition: background-color 0.2s, transform 0.1s;
    margin-top: 10px;
}

.uel-button:hover {
    background: #ffb300;
}

.uel-button:active {
    transform: translateY(1px);
}

.uel-result-box {
    margin-top: 20px;
    padding: 15px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius);
    border-left: 4px solid var(--accent);
}

.uel-result-box p {
    margin: 5px 0;
    font-size: 16px;
}

.uel-result-box strong {
    color: var(--accent);
}

.canvas-wrap {
    background: #fff;
    padding: 15px;
    border-radius: var(--radius);
    color: #000;
    margin-top: 20px;
    box-shadow: var(--shadow);
}

/* Resistor Color Band Specifics */
.resistor-band {
    display: inline-block;
    width: 30px;
    height: 80px;
    border-radius: 5px;
    border: 1px solid #333;
    vertical-align: middle;
    margin: 0 2px;
}

/* K-Map Table */
.kmap-table {
    border-collapse: collapse;
    margin: 20px auto;
    color: #000;
}
.kmap-table td, .kmap-table th {
    border: 1px solid #ccc;
    padding: 10px;
    text-align: center;
    width: 40px;
    height: 40px;
    cursor: pointer;
}
.kmap-table td:hover {
    background-color: #e0e0e0;
}
.kmap-table td.selected {
    background-color: var(--accent);
}

/* Loading Spinner */
.uel-spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top: 4px solid var(--accent);
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 50px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 900px) {
    .uel-main {
        flex-direction: column;
    }
    .uel-side {
        width: 100%;
    }
    .uel-calc-box {
        min-height: 300px;
    }
}

/* --- FIX: Make text black for dropdowns inside modules --- */
.uel-calc-box select,
.uel-calc-box select option {
    color: #000000 !important;
    background-color: #ffffff !important;
}

/* --- Bitwise Visualizer Specifics --- */
.op-btn {
    background: #555;
    color: white;
    margin-right: 5px;
    margin-bottom: 5px;
    font-size: 14px;
    padding: 8px 12px;
}
.op-btn.active {
    background: var(--accent);
    color: var(--dark);
}
.binary-viz-row {
    font-size: 16px;
    letter-spacing: 2px;
    padding: 2px 0;
}


/* ============================================================================= */
/* --- FINAL, DEFINITIVE FIX FOR TEXT COLOR IN CALCULATOR BOX --- */
/* --- This uses high specificity to override any theme CSS rules. --- */
/* ============================================================================= */

.uel-calc-box p,
.uel-calc-box label,
.uel-calc-box h1,
.uel-calc-box h2,
.uel-calc-box h3,
.uel-calc-box h4,
.uel-calc-box h5,
.uel-calc-box h6,
.uel-calc-box span,
.uel-calc-box div,
.uel-calc-box td,
.uel-calc-box th {
    color: #ffffff !important;
}

/* --- Ensure text inside the white chart areas remains black --- */
.canvas-wrap h4,
.canvas-wrap p,
.canvas-wrap label,
.canvas-wrap div {
    color: #000000 !important;
}