/* ============ 메인 CSS ============ */

/* 기본 리셋 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: inherit;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: "Pretendard Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", sans-serif;
    line-height: 1.5;
    color: #333;
    background-color: #f5f5f5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 컨테이너 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 버튼 스타일 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    text-align: center;
}

.btn-primary {
    background-color: #007bff;
    color: white;
}

.btn-primary:hover {
    background-color: #0056b3;
}

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

.btn-secondary:hover {
    background-color: #545b62;
}

.btn-success {
    background-color: #28a745;
    color: white;
}

.btn-success:hover {
    background-color: #1e7e34;
}

.btn-danger {
    background-color: #dc3545;
    color: white;
}

.btn-danger:hover {
    background-color: #c82333;
}

/* 카드 스타일 */
.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    margin-bottom: 20px;
}

.card-header {
    padding: 20px;
    border-bottom: 1px solid #eee;
    background-color: #f8f9fa;
}

.card-body {
    padding: 20px;
}

.card-footer {
    padding: 15px 20px;
    border-top: 1px solid #eee;
    background-color: #f8f9fa;
}

/* 폼 스타일 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #333;
}

.form-control {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

/* 그리드 시스템 */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -10px;
}

.col {
    flex: 1;
    padding: 0 10px;
}

.col-1 { flex: 0 0 8.333333%; }
.col-2 { flex: 0 0 16.666667%; }
.col-3 { flex: 0 0 25%; }
.col-4 { flex: 0 0 33.333333%; }
.col-6 { flex: 0 0 50%; }
.col-8 { flex: 0 0 66.666667%; }
.col-9 { flex: 0 0 75%; }
.col-12 { flex: 0 0 100%; }

/* 유틸리티 클래스 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }

.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }
.justify-content-around { justify-content: space-around; }

.align-items-center { align-items: center; }
.align-items-start { align-items: flex-start; }
.align-items-end { align-items: flex-end; }

.flex-column { flex-direction: column; }
.flex-row { flex-direction: row; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.m-0 { margin: 0; }
.m-1 { margin: 5px; }
.m-2 { margin: 10px; }
.m-3 { margin: 15px; }
.m-4 { margin: 20px; }
.m-5 { margin: 25px; }

.p-0 { padding: 0; }
.p-1 { padding: 5px; }
.p-2 { padding: 10px; }
.p-3 { padding: 15px; }
.p-4 { padding: 20px; }
.p-5 { padding: 25px; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 5px; }
.mt-2 { margin-top: 10px; }
.mt-3 { margin-top: 15px; }
.mt-4 { margin-top: 20px; }
.mt-5 { margin-top: 25px; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 5px; }
.mb-2 { margin-bottom: 10px; }
.mb-3 { margin-bottom: 15px; }
.mb-4 { margin-bottom: 20px; }
.mb-5 { margin-bottom: 25px; }

.ml-0 { margin-left: 0; }
.ml-1 { margin-left: 5px; }
.ml-2 { margin-left: 10px; }
.ml-3 { margin-left: 15px; }
.ml-4 { margin-left: 20px; }
.ml-5 { margin-left: 25px; }

.mr-0 { margin-right: 0; }
.mr-1 { margin-right: 5px; }
.mr-2 { margin-right: 10px; }
.mr-3 { margin-right: 15px; }
.mr-4 { margin-right: 20px; }
.mr-5 { margin-right: 25px; }

.pt-0 { padding-top: 0; }
.pt-1 { padding-top: 5px; }
.pt-2 { padding-top: 10px; }
.pt-3 { padding-top: 15px; }
.pt-4 { padding-top: 20px; }
.pt-5 { padding-top: 25px; }

.pb-0 { padding-bottom: 0; }
.pb-1 { padding-bottom: 5px; }
.pb-2 { padding-bottom: 10px; }
.pb-3 { padding-bottom: 15px; }
.pb-4 { padding-bottom: 20px; }
.pb-5 { padding-bottom: 25px; }

.pl-0 { padding-left: 0; }
.pl-1 { padding-left: 5px; }
.pl-2 { padding-left: 10px; }
.pl-3 { padding-left: 15px; }
.pl-4 { padding-left: 20px; }
.pl-5 { padding-left: 25px; }

.pr-0 { padding-right: 0; }
.pr-1 { padding-right: 5px; }
.pr-2 { padding-right: 10px; }
.pr-3 { padding-right: 15px; }
.pr-4 { padding-right: 20px; }
.pr-5 { padding-right: 25px; }

/* 색상 클래스 */
.text-primary { color: #007bff; }
.text-secondary { color: #6c757d; }
.text-success { color: #28a745; }
.text-danger { color: #dc3545; }
.text-warning { color: #ffc107; }
.text-info { color: #17a2b8; }
.text-light { color: #f8f9fa; }
.text-dark { color: #343a40; }
.text-muted { color: #6c757d; }

.bg-primary { background-color: #007bff; }
.bg-secondary { background-color: #6c757d; }
.bg-success { background-color: #28a745; }
.bg-danger { background-color: #dc3545; }
.bg-warning { background-color: #ffc107; }
.bg-info { background-color: #17a2b8; }
.bg-light { background-color: #f8f9fa; }
.bg-dark { background-color: #343a40; }

/* 반응형 */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .row {
        margin: 0 -5px;
    }
    
    .col {
        padding: 0 5px;
    }
    
    .btn {
        padding: 8px 16px;
        font-size: 13px;
    }
    
    .card-body {
        padding: 15px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 10px;
    }
    
    .btn {
        padding: 6px 12px;
        font-size: 12px;
    }
    
    .card-body {
        padding: 10px;
    }
}

/* ============ 로딩 스크린 ============ */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.4); 
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000; 
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #007bff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}