:root {
    --primary: #4361ee;
    --primary-light: #e0e7ff;
    --secondary: #3f37c9;
    --success: #4cc9f0;
    --danger: #f72585;
    --warning: #f8961e;
    --dark: #212529;
    --light: #f8f9fa;
    --gray: #6c757d;
    --gray-light: #e9ecef;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: #f5f7ff;
    color: var(--dark);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2.5rem;
}

h1 {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.subtitle {
    color: var(--gray);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

.calculator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

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

.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    padding: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--gray-light);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark);
}

.form-group {
    margin-bottom: 1.25rem;
}

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

input, select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--gray-light);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.btn:hover {
    background-color: var(--secondary);
    transform: translateY(-2px);
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background-color: var(--primary-light);
}

.debt-list {
    margin-bottom: 1.5rem;
}

.debt-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: var(--light);
    border-radius: 8px;
    margin-bottom: 0.75rem;
}

.debt-item-info {
    flex: 1;
}

.debt-item-name {
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.debt-item-details {
    font-size: 0.85rem;
    color: var(--gray);
}

.debt-item-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    padding: 0;
    background-color: var(--gray-light);
    color: var(--gray);
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn-icon:hover {
    background-color: var(--primary-light);
    color: var(--primary);
}

.btn-danger {
    background-color: var(--danger);
}

.btn-danger:hover {
    background-color: #d1145a;
}

.results-container {
    margin-top: 2rem;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

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

.result-card {
    text-align: center;
    padding: 1.5rem;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

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

.chart-container {
    height: 400px;
    margin-bottom: 2rem;
}

.payment-schedule {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-light);
}

th {
    font-weight: 600;
    color: var(--gray);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
}

.strategy-selector {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.strategy-btn {
    flex: 1;
    padding: 1rem;
    background-color: var(--light);
    border: none;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.strategy-btn.active {
    background-color: var(--primary);
    color: white;
}

.strategy-btn:hover:not(.active) {
    background-color: var(--gray-light);
}

.tooltip {
    position: relative;
    display: inline-block;
    margin-left: 0.5rem;
}

.tooltip-icon {
    width: 18px;
    height: 18px;
    background-color: var(--gray-light);
    color: var(--gray);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    cursor: help;
}

.tooltip-text {
    visibility: hidden;
    width: 200px;
    background-color: var(--dark);
    color: white;
    text-align: center;
    border-radius: 6px;
    padding: 0.5rem;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.85rem;
    font-weight: normal;
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

.empty-state {
    text-align: center;
    padding: 2rem;
    color: var(--gray);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--gray-light);
}

.hidden {
    display: none;
}

footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-light);
    color: var(--gray);
    font-size: 0.9rem;
}

/* Animation classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(67, 97, 238, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(67, 97, 238, 0); }
    100% { box-shadow: 0 0 0 0 rgba(67, 97, 238, 0); }
}