body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    font-family: 'Pretendard', sans-serif;
    display: flex;
    justify-content: center;
    padding: 50px 0;
    margin: 0;
}

.container {
    width: 95%;        /* 화면 너비의 95%만 차지해라 (여유 공간) */
    max-width: 600px;  /* 하지만 아무리 커져도 600px은 넘지 마라 (PC용) */
    margin: 20px auto; /* 가운데 정렬 */
    padding: 20px;
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

h1 { color: #2c3e50; text-align: center; margin-bottom: 2rem; }

.input-group { display: flex; flex-direction: column; gap: 10px; margin-bottom: 30px; }

input {
    padding: 12px;
    border: 2px solid #eee;
    border-radius: 10px;
    transition: all 0.3s ease;
}

input:focus {
    border-color: #4A90E2;
    outline: none;
    box-shadow: 0 0 8px rgba(74, 144, 226, 0.2);
}

button {
    padding: 15px;
    border: none;
    border-radius: 10px;
    background: #4A90E2;
    color: white;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
}

button:hover { background: #357ABD; transform: translateY(-2px); }
button:active { transform: translateY(0); }

.excel-btn { background: #27ae60; margin-top: 5px; }
.excel-btn:hover { background: #219150; }

/* 표 디자인 */
.table-container { margin-top: 20px; border-top: 2px solid #eee; }
table { width: 100%; border-collapse: collapse; margin-top: 15px; }
th, td { padding: 12px; text-align: center; border-bottom: 1px solid #eee; }
th { background: #f8f9fa; font-size: 0.9rem; color: #666; }

/* 동적 애니메이션 */
tbody tr {
    animation: fadeIn 0.5s ease forwards;
}

tbody tr:hover { background: #f1f7ff; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.delete-btn {
    background: #ff7675;
    padding: 5px 10px;
    font-size: 12px;
}

@media(max-width: 480px){
    h1{
        font-size: 1.5rem;
    }
    .input-group input, .input-group select, button{
        width: 100%;
        margin-bottom: 10px;
    }

    table{font-size: 12px;}
    .table-container{
        overflow-x: auto;
    }
}