/* 기본 스타일 */
:root {
    --primary-color: #4a90e2;
    --primary-hover: #357abd;
    --danger-color: #dc3545;
    --danger-gradient: linear-gradient(135deg, var(--danger-color), #c82333);
    --text-color: #333;
    --bg-color: #f5f5f5;
    --border-color: #eee;
    --shadow-color: rgba(0,0,0,0.1);
    --loading-color: #666;
}

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

body {
    font-family: 'Noto Sans KR', sans-serif;
    background-color: var(--bg-color);
    padding: 2rem;
    color: var(--text-color);
    line-height: 1.6;
}

/* 컨테이너 스타일 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px var(--shadow-color);
}

/* 헤더 스타일 */
header {
    margin-bottom: 2rem;
}

h1 {
    color: var(--text-color);
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.8rem;
}

/* 버튼 스타일 */
.button-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    color: white;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 140px;
    justify-content: center;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

.btn i {
    font-size: 1.1rem;
}

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

.download-btn:hover {
    background: var(--primary-hover);
}

.delete-btn, .server-reset-btn {
    background: var(--danger-gradient);
}

/* 테이블 스타일 */
.questions-table-container {
    overflow-x: auto;
    margin-top: 1rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px var(--shadow-color);
}

.questions-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 800px;
}

.questions-table th,
.questions-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.questions-table th {
    background: #f8f9fa;
    font-weight: 500;
    white-space: nowrap;
    position: sticky;
    top: 0;
    z-index: 1;
}

.questions-table td {
    vertical-align: top;
}

.questions-table td:first-child {
    white-space: pre-wrap;
    word-break: break-word;
}

.questions-table td:nth-child(2),
.questions-table td:nth-child(3) {
    text-align: center;
    white-space: nowrap;
}

.questions-table tr:hover {
    background: #f8f9fa;
}

.questions-table tr.deleted {
    opacity: 0.7;
    background-color: #f8f9fa;
}

/* 상태 배지 스타일 */
.status-badge {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
    display: inline-block;
    text-align: center;
    min-width: 80px;
}

.status-waiting {
    background: #e3f2fd;
    color: #1976d2;
}

.status-selected {
    background: #fff3e0;
    color: #f57c00;
}

.status-completed {
    background: #e8f5e9;
    color: #388e3c;
}

.status-deleted {
    background: #ffebee;
    color: #c62828;
}

.status-badge.status-deleted {
    background-color: var(--danger-color);
    color: white;
}

/* 로딩 스타일 */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--loading-color);
}

.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #ccc;
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s linear infinite;
    margin-left: 10px;
    vertical-align: middle;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    body {
        padding: 1rem;
    }

    .container {
        padding: 1rem;
    }

    h1 {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .button-group {
        width: 100%;
        justify-content: flex-start;
    }

    .btn {
        flex: 1;
        min-width: 120px;
    }

    .questions-table th,
    .questions-table td {
        padding: 0.8rem;
    }
}

@media (max-width: 480px) {
    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}