:root {
    --housedo-blue: #0054A6;
    --housedo-yellow: #FFD900;
    --housedo-light-blue: #E6F0F8;
    --text-dark: #333333;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    color: var(--text-dark);
    background-color: #ffffff;
}

/* Utility */
.bg-housedo-blue { background-color: var(--housedo-blue); }
.bg-housedo-yellow { background-color: var(--housedo-yellow); }
.text-housedo-blue { color: var(--housedo-blue); }
.border-housedo-blue { border-color: var(--housedo-blue); }

/* Buttons */
.btn-housedo {
    background-color: var(--housedo-blue);
    color: white;
    border-radius: 4px;
    font-weight: bold;
    transition: all 0.3s;
}
.btn-housedo:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* Cards */
.iso-card {
    background: white;
    border-bottom: 6px solid #e2e8f0;
    border-right: 6px solid #f1f5f9;
    transition: all 0.2s;
}

/* Labels */
.label-yellow {
    background-color: var(--housedo-yellow);
    color: var(--housedo-blue);
    font-size: 0.75rem;
    font-weight: 800;
    padding: 2px 8px;
    border-radius: 2px;
    display: inline-block;
}

@media (min-width: 1024px) {
  .iso-card { border-bottom-width: 8px; border-right-width: 8px; }
}