:root {
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-primary: #2d3436;
    --accent-blue: #0984e3;
    --accent-red: #d63031;
    --accent-green: #00b894;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Pretendard', sans-serif;
    margin: 0;
}

.app-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

.back-link {
    text-decoration: none;
    color: #636e72;
    float: left;
    font-size: 0.9rem;
}

header h1 {
    font-size: 1.5rem;
    margin: 10px 0 5px;
    color: var(--text-primary);
}

header p {
    font-size: 0.9rem;
    color: #636e72;
    margin: 0;
}

/* Input Cards */
.user-info-card,
.option-card,
.result-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
}

.user-info-card {
    border-left: 5px solid var(--accent-blue);
}

.user-info-card h3 {
    margin-top: 0;
    font-size: 1.1rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
    margin-bottom: 15px;
}

/* Integration UI */
.integration-bar {
    margin-bottom: 15px;
    text-align: right;
}

.btn-secondary {
    background: #e17055;
    color: white;
    border: none;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }

    100% {
        transform: scale(1);
    }
}

.link-helper {
    font-size: 0.8rem;
    color: var(--accent-blue);
    text-decoration: underline;
    cursor: pointer;
}

.input-tabs {
    margin-bottom: 10px;
    font-size: 0.9rem;
    display: flex;
    gap: 15px;
}

.tiny-desc {
    font-size: 0.7rem;
    color: #999;
    margin: 5px 0 0;
    text-align: right;
}

/* Forms */
.input-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    /* Increased spacing */
}

/* Utility */
.hidden {
    display: none !important;
}

.input-group label {
    font-weight: 600;
    color: #555;
}

.input-group input {
    width: 100px;
    padding: 8px;
    border: 1px solid #dfe6e9;
    border-radius: 5px;
    text-align: right;
    font-size: 1rem;
}

/* Comparison Grid */
.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

@media (max-width: 600px) {
    .comparison-grid {
        grid-template-columns: 1fr;
    }
}

.option-card h3 {
    margin: 0;
    font-size: 1.1rem;
}

.option-card p {
    margin: 5px 0 15px;
    font-size: 0.8rem;
    color: #888;
}

.input-row {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
}

.input-row label {
    flex: 1;
    font-size: 0.9rem;
    color: #666;
}

.input-row input {
    width: 70px;
    padding: 6px;
    border: 1px solid #dfe6e9;
    border-radius: 4px;
    text-align: right;
    margin-right: 5px;
}

.input-row input.deposit {
    width: 110px;
    /* Accommodate "Hundreds of Millions" (e.g. 50000) */
}

.input-row.highlight {
    background: #f0f9ff;
    padding: 5px;
    border-radius: 5px;
    margin: -5px -5px 12px -5px;
}

.input-row.highlight label {
    color: var(--accent-blue);
    font-weight: bold;
}

.btn-calculate {
    width: 100%;
    padding: 15px;
    background: var(--text-primary);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.1s;
}

.btn-calculate:active {
    transform: scale(0.98);
}

/* Result Section */
.hidden {
    display: none;
}

.result-card {
    text-align: center;
    border: 2px solid var(--accent-green);
    background: linear-gradient(to bottom, #fff, #f8fff9);
}

.winner-banner {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--accent-green);
    margin: 15px 0;
    padding: 10px;
    background: rgba(0, 184, 148, 0.1);
    border-radius: 8px;
}

.chart-container {
    position: relative;
    height: 250px;
    width: 100%;
    margin-bottom: 20px;
}

.detail-breakdown {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
    background: #fff;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #eee;
}

.breakdown-item {
    display: flex;
    flex-direction: column;
}

.breakdown-item span:first-child {
    font-size: 0.8rem;
    color: #888;
    margin-bottom: 5px;
}

.breakdown-item span:last-child {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--text-primary);
}

.insight-text {
    font-style: italic;
    color: #666;
    background: #eee;
    padding: 10px;
    border-radius: 5px;
    font-size: 0.9rem;
}