/* 기본 스타일 리셋 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans KR', 'Apple SD Gothic Neo', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 네비게이션 */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.nav-logo {
    color: white;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-logo i {
    margin-right: 0.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.nav-link:hover {
    background-color: rgba(255,255,255,0.2);
}

/* 메인 콘텐츠 */
.main-content {
    flex: 1;
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
    width: 100%;
}

/* 카드 스타일 */
.card {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    border: 1px solid #e9ecef;
}

.card-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #f8f9fa;
}

.card-title {
    font-size: 1.5rem;
    color: #495057;
    margin-bottom: 0.5rem;
}

.card-subtitle {
    color: #6c757d;
    font-size: 0.9rem;
}

/* 그리드 레이아웃 */
.grid {
    display: grid;
    gap: 2rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* 버튼 */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 1rem;
    font-weight: 500;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-success {
    background: linear-gradient(135deg, #56ab2f 0%, #a8e6cf 100%);
    color: white;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(86, 171, 47, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a52 100%);
    color: white;
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

/* 폼 요소 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #495057;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ced4da;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* 드래그 앤 드롭 영역 */
.drop-zone {
    border: 2px dashed #ced4da;
    border-radius: 10px;
    padding: 3rem;
    text-align: center;
    transition: all 0.3s;
    background-color: #f8f9fa;
    cursor: pointer;
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: #667eea;
    background-color: rgba(102, 126, 234, 0.05);
}

.drop-zone i {
    font-size: 3rem;
    color: #6c757d;
    margin-bottom: 1rem;
}

.drop-zone.dragover i {
    color: #667eea;
}

/* 상태 표시 */
.status {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    display: inline-block;
}

.status-success {
    background-color: #d4edda;
    color: #155724;
}

.status-processing {
    background-color: #fff3cd;
    color: #856404;
}

.status-error {
    background-color: #f8d7da;
    color: #721c24;
}

/* 테이블 */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.table th,
.table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #e9ecef;
}

.table th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: #495057;
}

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

/* 진행률 바 */
.progress {
    width: 100%;
    height: 8px;
    background-color: #e9ecef;
    border-radius: 4px;
    overflow: hidden;
    margin: 1rem 0;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transition: width 0.3s;
    border-radius: 4px;
}

/* 알림 */
.alert {
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1rem;
    border-left: 4px solid;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border-left-color: #28a745;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border-left-color: #dc3545;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border-left-color: #17a2b8;
}

/* 푸터 */
.footer {
    background-color: #343a40;
    color: white;
    text-align: center;
    padding: 1rem 0;
    margin-top: auto;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    .main-content {
        padding: 0 1rem;
    }
    
    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }
}

/* 로딩 스피너 */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/* 채팅 인터페이스 */
.chat-container {
    height: 500px;
    display: flex;
    flex-direction: column;
    border: 1px solid #e9ecef;
    border-radius: 10px;
    overflow: hidden;
}

.chat-messages {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    background-color: #f8f9fa;
}

.chat-input-area {
    padding: 1rem;
    background-color: white;
    border-top: 1px solid #e9ecef;
    display: flex;
    gap: 0.5rem;
}

.chat-input {
    flex: 1;
}

.message {
    margin-bottom: 1rem;
    padding: 0.75rem;
    border-radius: 10px;
    max-width: 70%;
}

.message.user {
    background-color: #667eea;
    color: white;
    margin-left: auto;
}

.message.assistant {
    background-color: white;
    border: 1px solid #e9ecef;
}