:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --accent-color: #4895ef;
    --dark-color: #2b2d42;
    --light-color: #f8f9fa;
    --success-color: #4cc9f0;
    --warning-color: #f72585;
}

body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f7fa;
    color: var(--dark-color);
    line-height: 1.6;
}

.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.logo {
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.tagline {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-top: 0.5rem;
}

.calculator-container {
    max-width: 900px;
    margin: 2rem auto;
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}

h1, h2 {
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

h1 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    justify-content: center;
}

h2 {
    font-size: 1.4rem;
    margin: 1.5rem 0 1rem;
}

.input-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.date-inputs {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.input-group {
    margin-bottom: 0;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-color);
}

input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

input:focus {
    border-color: var(--accent-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

input[readonly] {
    background-color: #f0f2f5;
    color: #666;
}

.fixed-rate {
    position: relative;
}

.fixed-badge {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background-color: var(--success-color);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: bold;
}

.calculate-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    width: 100%;
    margin: 1.5rem 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.calculate-btn:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.button-icon {
    font-size: 1.2rem;
}

.results {
    margin-top: 2rem;
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.card {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
    border: 1px solid #eee;
    text-align: center;
}

.card.highlight {
    border: 2px solid var(--accent-color);
    background-color: #f8faff;
}

.card-title {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.card-value {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--dark-color);
}

.results-table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: var(--dark-color);
}

tr:hover {
    background-color: #f8faff;
}

.footer {
    text-align: center;
    padding: 1.5rem;
    color: #666;
    font-size: 0.9rem;
    margin-top: 2rem;
    border-top: 1px solid #eee;
}

@media (max-width: 768px) {
    .calculator-container {
        padding: 1.5rem;
        margin: 1rem;
    }
    
    .input-section, .date-inputs {
        grid-template-columns: 1fr;
    }
    
    .summary-cards {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 1.5rem;
    }
}