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

:root {
    --primary-color: #1565C0;
    --secondary-color: #0D47A1;
    --accent-color: #1E88E5;
    --success-color: #2E7D32;
    --danger-color: #C62828;
    --warning-color: #F57C00;
    --text-color: #263238;
    --text-secondary: #546E7A;
    --light-gray: #F5F7FA;
    --border-color: #E1E8ED;
    --shadow: 0 2px 12px rgba(13, 71, 161, 0.08);
    --shadow-hover: 0 4px 20px rgba(13, 71, 161, 0.15);
    --max-width: 1200px;
    --gradient-primary: linear-gradient(135deg, #1565C0 0%, #0D47A1 100%);
    --gradient-light: linear-gradient(135deg, #E3F2FD 0%, #BBDEFB 100%);
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #FAFBFC;
}

/* 헤더 */
header {
    background: linear-gradient(to right, #FFFFFF 0%, #F8FBFF 100%);
    box-shadow: 0 2px 8px rgba(13, 71, 161, 0.06);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(21, 101, 192, 0.1);
}

.header-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

nav {
    display: flex;
    gap: 1rem;
    align-items: center;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: var(--light-gray);
}

/* 모바일 메뉴 버튼 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* 컨테이너 */
.container {
    max-width: var(--max-width);
    margin: 2rem auto;
    padding: 0 1rem;
}

/* 카드 */
.card {
    background-color: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-hover);
}

/* 버튼 */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    text-decoration: none;
    text-align: center;
    transition: all 0.3s ease;
    font-weight: 600;
    letter-spacing: 0.3px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

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

.btn-primary:hover {
    background: linear-gradient(135deg, #1976D2 0%, #0D47A1 100%);
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

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

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-block {
    display: block;
    width: 100%;
}

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

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

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23333' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
}

.file-upload {
    border: 2px dashed var(--border-color);
    padding: 2rem;
    text-align: center;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
}

.file-upload:hover {
    border-color: var(--primary-color);
    background-color: var(--light-gray);
}

.file-upload input[type="file"] {
    display: none;
}

/* 뱃지 */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
}

.badge-primary {
    background-color: var(--primary-color);
    color: white;
}

.badge-success {
    background-color: var(--success-color);
    color: white;
}

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

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

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* 로딩 스피너 */
.spinner {
    border: 3px solid var(--light-gray);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 2rem auto;
}

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

/* 모달 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.modal-header h2 {
    margin: 0;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #666;
}

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

.text-right {
    text-align: right;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

.hidden {
    display: none;
}

/* 반응형 그리드 */
.grid {
    display: grid;
    gap: 1rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* 태블릿 */
@media (max-width: 768px) {
    .header-container {
        padding: 0.75rem 1rem;
    }

    .logo {
        font-size: 1.25rem;
    }

    .menu-toggle {
        display: block;
    }

    nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: white;
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow);
    }

    nav.show {
        display: flex;
    }

    nav a {
        width: 100%;
        text-align: center;
    }

    .container {
        margin: 1rem auto;
        padding: 0 0.75rem;
    }

    .card {
        padding: 1rem;
    }

    .btn {
        padding: 0.625rem 1.25rem;
    }

    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }
}

/* 모바일 */
@media (max-width: 480px) {
    .logo {
        font-size: 1.125rem;
    }

    .container {
        padding: 0 0.5rem;
    }

    .card {
        padding: 0.75rem;
        margin-bottom: 0.75rem;
    }

    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }

    .form-control {
        padding: 0.625rem;
        font-size: 0.875rem;
    }

    .modal-content {
        padding: 1.5rem;
        width: 95%;
    }
}

/* 터치 기기 최적화 */
@media (hover: none) and (pointer: coarse) {
    .btn,
    nav a,
    .form-control,
    select.form-control {
        min-height: 44px;
        min-width: 44px;
    }
}