:root {
    /* Brand colors */
    --primary: #EF4D00;
    --primary-hover: #D94300;

    /* Hero / background gradient */
    --bg-gradient: linear-gradient(135deg, #ffffff 0%, #ffffff 100%);

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.12);
    --glass-border: rgba(255, 255, 255, 0.25);

    /* Text colors */
    --text-main: #ffffff;
    --text-muted: #000000;

    /* Accent (green used in image block) */
    --accent: #EF4D00;
}


.igc-calculator-container * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

.igc-calculator-container {
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-main);
    line-height: 1.5;
    border-radius: 1rem;
    margin: 2rem 0;
}

.igc-calculator-container .container {
    max-width: 1100px;
    margin: 0 auto;
}

.igc-calculator-container header {
    text-align: center;
    margin-bottom: 20px;
}

.igc-calculator-container header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.igc-calculator-container header p {
    color: var(--text-muted);
}

.igc-calculator-container .glass {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

.igc-calculator-container .controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    padding: 2rem;
    margin-bottom: 2rem;
    align-items: flex-end;
}

.igc-calculator-container .input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.igc-calculator-container .input-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
}

.igc-calculator-container .input-group input,
.igc-calculator-container .glass-select {
    background: #3b9482;
    border: 1px solid var(--glass-border);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    color: var(--text-main);
    font-size: 1rem;
    transition: all 0.2s;
    appearance: none;
}

.igc-calculator-container .glass-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='white'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='C19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1rem;
    padding-right: 2.5rem;
}

.igc-calculator-container .input-group input:focus,
.igc-calculator-container .glass-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

.igc-calculator-container .primary-btn {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    height: 3rem;
}

.igc-calculator-container .primary-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.igc-calculator-container .primary-btn:active {
    transform: translateY(0);
}

.igc-calculator-container .results-container.hidden {
    display: none;
}

.igc-calculator-container .summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.igc-calculator-container .card {
    padding: 1.5rem;
    text-align: center;
}

.igc-calculator-container .card h3 {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.igc-calculator-container .card p {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent);
}

.igc-calculator-container .table-wrapper {
    overflow-x: auto;
    margin-bottom: 2rem;
}

.igc-calculator-container table {
    width: 100%;
    border-collapse: collapse;
    min-width: 800px;
}

.igc-calculator-container th {
    text-align: left;
    padding: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    border-bottom: 1px solid var(--glass-border);
}

.igc-calculator-container td {
    padding: 1rem;
    font-size: 0.9375rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.igc-calculator-container tr:last-child td {
    border-bottom: none;
}

.igc-calculator-container tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

.igc-calculator-container .formula-explanation {
    padding: 1.5rem;
    font-size: 1rem;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.6;
}

.igc-calculator-container .formula-explanation b {
    color: var(--text-main);
}

.igc-calculator-container .zero-value {
    color: var(--accent);
    font-weight: 600;
}

@media (max-width: 768px) {
    .igc-calculator-container header h1 {
        font-size: 2rem;
    }

    .igc-calculator-container .controls {
        grid-template-columns: 1fr;
    }
}