* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: "Microsoft YaHei", sans-serif;
    background: #f5f5f5;
    color: #333;
}
.app-container {
    max-width: 750px;
    margin: 0 auto;
    background: #fff;
    min-height: 100vh;
    box-shadow: 0 0 10px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
}
.nav {
    display: flex; flex-wrap: wrap; background: #4CAF50; list-style: none;
}
.nav li { flex: 1 1 auto; text-align: center; }
.nav a {
    display: block; padding: 12px 8px; color: white;
    text-decoration: none; font-size: 14px; font-weight: bold; white-space: nowrap;
}
.nav a:hover, .nav a.active { background: #388E3C; }
.content { flex: 1; padding: 20px; }
.card {
    background: white; border-radius: 8px; padding: 20px;
    margin-bottom: 20px; box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}
.card h3 { margin-top: 0; border-bottom: 1px solid #eee; padding-bottom: 8px; color: #4CAF50; }
label { display: block; margin-top: 12px; font-size: 14px; font-weight: bold; color: #555; }
input, select, textarea {
    width: 100%; padding: 10px; margin-top: 4px;
    border: 1px solid #ddd; border-radius: 4px; font-size: 14px;
}
textarea { resize: vertical; min-height: 60px; }
.btn {
    display: inline-block; width: 100%; padding: 14px;
    background: #4CAF50; color: white; font-size: 18px;
    border: none; border-radius: 8px; cursor: pointer;
    text-align: center; margin-top: 15px;
}
.btn-small {
    width: auto; padding: 8px 16px; font-size: 14px;
    background: #2196F3; color: white; border: none;
    border-radius: 4px; cursor: pointer; margin: 5px 5px 5px 0;
}
.btn-danger {
    background: #f44336; color: white; border: none;
    padding: 5px 10px; border-radius: 4px; font-size: 12px;
    cursor: pointer; float: right; margin-top: 5px;
}
.hint { font-size: 12px; color: #999; margin-top: 4px; }
.child-entry, .house-entry {
    background: #f9f9f9; padding: 15px; border-radius: 6px;
    margin-top: 10px; position: relative;
}
.conditional-group {
    background: #f9f9f9; padding: 15px; border-radius: 6px; margin-top: 10px;
}
.placeholder-box { text-align: center; padding: 40px; color: #999; }
.footer { text-align: center; padding: 15px; font-size: 12px; color: #aaa; border-top: 1px solid #eee; }
.loading-spinner {
    display: inline-block; width: 20px; height: 20px;
    border: 3px solid rgba(255,255,255,0.3); border-radius: 50%;
    border-top-color: #fff; animation: spin 1s ease-in-out infinite;
    margin-right: 8px; vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }
.radio-group { display: flex; gap: 15px; margin-top: 5px; }
.radio-group label { margin-top: 0; font-weight: normal; display: flex; align-items: center; }
.radio-group input[type="radio"] { width: auto; margin-right: 5px; }
.result-box {
    background: #e8f5e9; border: 1px solid #a5d6a7; border-radius: 8px;
    padding: 20px; margin-top: 20px; display: none;
}
.result-box p { margin-bottom: 10px; }
.btn-outline {
    background: white; color: #4CAF50; border: 2px solid #4CAF50;
    padding: 10px 20px; border-radius: 6px; cursor: pointer; font-size: 14px;
    margin-right: 10px;
}
@media screen and (max-width: 480px) {
    .nav a {
        font-size: 12px;
        padding: 10px 4px;
    }
    .card {
        padding: 15px;
    }
    .child-entry, .house-entry {
        padding: 12px;
    }
}