:root {
    --primary: #4CAF50;
    --primary-dark: #3d8b40;
    --secondary: #2196F3;
    --accent: #FF9800;
    --light: #FFFFFF;
    --dark: #212121;
    --gray: #E0E0E0;
    --gray-dark: #757575;
    --success: #4CAF50;
    --warning: #FFC107;
    --danger: #F44336;
    --border-radius: 4px;
    --box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #FAFAFA;
    color: var(--dark);
    line-height: 1.5;
    padding: 20px;
}

.calculator-container {
    max-width: 1000px;
    margin: 0 auto;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    padding: 30px;
    border: 1px solid var(--gray);
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--gray);
}

header h1 {
    color: var(--primary);
    font-size: 2.2rem;
    margin-bottom: 10px;
    font-weight: 700;
}

header p {
    color: var(--gray-dark);
    font-size: 1.1rem;
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

@media (max-width: 768px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
}

.input-section, .results-section {
    padding: 20px;
    background-color: white;
    border-radius: var(--border-radius);
    border: 1px solid var(--gray);
}

h2 {
    color: var(--primary);
    font-size: 1.3rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
}

.input-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 5px;
}

.input-wrapper {
    display: flex;
    align-items: center;
    border: 1px solid var(--gray);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
}

.input-wrapper:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.25);
}

.currency {
    padding: 0 12px;
    background-color: var(--gray);
    color: var(--dark);
    font-weight: 600;
    height: 40px;
    display: flex;
    align-items: center;
}

input {
    flex: 1;
    border: none;
    padding: 10px 12px;
    font-size: 1rem;
    height: 40px;
    outline: none;
}

input[type="number"] {
    -moz-appearance: textfield;
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.result-box {
    background-color: #F5F5F5;
    padding: 15px;
    border-radius: var(--border-radius);
    margin-top: 20px;
    border: 1px solid var(--gray);
}

.result-box h3 {
    font-size: 1.1rem;
    color: var(--gray-dark);
    margin-bottom: 10px;
}

.result-amount {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
}

.result-description {
    font-size: 0.9rem;
    color: var(--gray-dark);
}

.grand-total {
    text-align: center;
    padding: 25px;
    background-color: var(--primary);
    color: white;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
}

.actions {
    display: flex;
    justify-content: center;
    gap: 15px;
}

button {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

#reset-btn {
    background-color: var(--gray);
    color: var(--dark);
}

#reset-btn:hover {
    background-color: #d1d1d1;
}

#save-btn {
    background-color: var(--primary);
    color: white;
}

#save-btn:hover {
    background-color: var(--primary-dark);
}

.info-icon, .fa-question-circle {
    color: var(--primary);
    opacity: 0.7;
    cursor: help;
    font-size: 0.9em;
}

.fa-question-circle {
    font-size: 0.8em;
}

.info-icon:hover, .fa-question-circle:hover {
    opacity: 1;
}

/* Tooltip styles */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: #555;
    color: #fff;
    text-align: center;
    border-radius: 4px;
    padding: 8px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 13px;
    font-weight: normal;
}

.tooltip .tooltiptext::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: #555 transparent transparent transparent;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

@media (max-width: 768px) {
    .tooltip .tooltiptext {
        width: 160px;
        margin-left: -80px;
        font-size: 12px;
    }
    
    .tooltip .tooltiptext {
        bottom: auto;
        top: 100%;
        margin-top: 5px;
    }
    
    .tooltip .tooltiptext::after {
        bottom: 100%;
        top: auto;
        border-color: transparent transparent #555 transparent;
    }
}