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

body {
    font-family: 'Arimo', 'Noto Sans KR', sans-serif;
    background-color: #f9fafb;
    color: #101828;
}

.main-content {
    display: grid;
    grid-template-columns: 256px 1fr;
    gap: 0;
    margin: 0;
    min-height: calc(100vh - 120.881px);
}

.sidebar {
    background-color: white;
    border-right: 1px solid #e5e7eb;
    border-bottom: 1px solid #e5e7eb;
    padding: 24px 12px;
    display: flex;
    flex-direction: column;
    gap: 23.991px;
    position: sticky;
    top: 120.881px;
    height: fit-content;
    z-index: 9;
}

.sidebar-title {
    font-size: 16px;
    font-weight: 600;
    color: #101828;
    padding: 0 12px;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 7.997px;
}

.sidebar-btn {
    background-color: transparent;
    border: none;
    border-radius: 10px;
    padding: 12px 16px;
    cursor: pointer;
    font-size: 16px;
    color: #364153;
    text-align: left;
    transition: all 0.3s ease;
    min-height: 47.969px;
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.sidebar-btn:hover {
    background-color: rgba(255, 122, 0, 0.08);
    color: #ff7a00;
}

.sidebar-btn.active {
    background-color: #ff7a00;
    color: white;
}

.sidebar-btn svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.content-area {
    padding: 32px 32px 24px 32px;
    overflow-y: auto;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 32px;
    gap: 24px;
}

.page-header-text {
    flex: 1;
}

.page-title {
    font-size: 24px;
    font-weight: 400;
    color: #101828;
    margin: 0 0 8px 0;
    line-height: 1.4;
}

.page-subtitle {
    font-size: 16px;
    font-weight: 400;
    color: #4a5565;
    margin: 0;
    line-height: 1.5;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.stat-card {
    background-color: white;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    box-shadow: 0px 1px 3px 0px rgba(0,0,0,0.1);
}

.stat-number {
    font-size: 28px;
    font-weight: 600;
    color: #ff7a00;
    margin-bottom: 8px;
    line-height: 1.2;
}

.stat-label {
    font-size: 12px;
    color: #6a7282;
    font-weight: 400;
}

.filter-section {
    background-color: white;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 16px 24px;
    margin-bottom: 32px;
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
    box-shadow: 0px 1px 3px 0px rgba(0,0,0,0.1);
}

.search-input {
    flex: 1;
    min-width: 200px;
    background-color: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    padding: 8px 12px;
    font-size: 14px;
    color: #101828;
}

.search-input::placeholder {
    color: #717182;
}

.search-input:focus {
    outline: none;
    background-color: #fff;
    border-color: #ff7a00;
}

.filter-btn {
    background-color: white;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    padding: 8px 16px;
    font-size: 13px;
    color: #364153;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.filter-btn:hover {
    border-color: #ff7a00;
    color: #ff7a00;
}

.filter-btn.active {
    background-color: #ff7a00;
    color: white;
    border-color: #ff7a00;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.course-card {
    background-color: white;
    border: 0.909px solid rgba(0,0,0,0.1);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0px 1px 3px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    box-shadow: 0px 4px 12px rgba(0,0,0,0.15);
}

.course-thumbnail {
    width: 100%;
    height: 192px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 36px;
    position: relative;
    overflow: hidden;
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
}

.course-thumbnail.thumbnail-1 {
    background: linear-gradient(156.5deg, #f3e8ff 0%, #dbeafe 100%);
}

.course-thumbnail.thumbnail-2 {
    background: linear-gradient(156.5deg, #f3e8ff 0%, #dbeafe 100%);
}

.course-thumbnail.thumbnail-3 {
    background: linear-gradient(156.5deg, #f3e8ff 0%, #dbeafe 100%);
}

.course-thumbnail.thumbnail-4 {
    background: linear-gradient(156.5deg, #f3e8ff 0%, #dbeafe 100%);
}

.course-status {
    position: absolute;
    top: 12px;
    right: 12px;
    background-color: #dcfce7;
    color: #008236;
    padding: 4px 12px;
    border-radius: 30504000px;
    font-size: 12px;
    font-weight: 400;
    z-index: 10;
}

.course-status.hidden {
    background-color: #fce7f3;
    color: #88084d;
}

.course-content {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-title {
    font-size: 16px;
    font-weight: 700;
    color: #101828;
    margin: 0 0 12px 0;
    line-height: 1.5;
    min-height: 2em;
}

.course-subtitle {
    font-size: 14px;
    color: #4a5565;
    margin: 0 0 15px 0;
    line-height: 1.5;
    flex: 1;
}

.course-info {
    display: flex;
    flex-direction: row;
    gap: 16px;
    align-items: center;
    margin-bottom: 12px;
    font-size: 14px;
    color: #6a7282;
    border: none;
    padding: 0;
}

.course-info-item {
    display: flex;
    gap: 4px;
    align-items: center;
}

.course-rating {
    display: flex;
    gap: 4px;
    align-items: center;
}

.course-rating-value {
    color: #d08700;
    font-weight: 400;
}

.course-rating-icon {
    width: 16px;
    height: 16px;
}

.course-students {
    display: flex;
    gap: 4px;
    align-items: center;
}

.course-students-icon {
    width: 16px;
    height: 16px;
}

.course-level {
    background-color: #f3e8ff;
    color: #8200db;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    white-space: nowrap;
}

.course-price {
    font-size: 18px;
    font-weight: 700;
    color: #ff7a00;
    margin: 12px 0;
    line-height: 1.2;
}

.course-detail-btn {grid-column:1/-1;display:flex;align-items:center;justify-content:center;gap:6px;height:38px;background:#1A2B4A;color:#fff;border:none;border-radius:8px;font-size:13px;font-weight:700;cursor:pointer;font-family:inherit;transition:background 0.2s;text-decoration:none;}
.course-detail-btn:hover{background:#2A3F6F;}


.course-actions {
    display: flex;
    gap: 8px;
    margin-top: auto;
    padding-top: 12px;
    border-top: 0.909px solid #f3f4f6;
}

.action-btn {
    flex: 1;
    background-color: white;
    border: 0.909px solid rgba(0,0,0,0.1);
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 12px;
    color: #0a0a0a;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: 32px;
}

.action-btn.delete {
    border-color: #e7000b;
    color: #e7000b;
}

.action-btn.hide {
    border-color: #e7000b;
    color: #e7000b;
}

.action-btn:hover {
    background-color: #ff7a00;
    color: white;
    border-color: #ff7a00;
}

.action-btn:disabled {
    background-color: #b1b1b1;
    color: black;
    cursor: not-allowed;
}

.action-btn.disabled.delete:hover {
    background-color: #979797;
}

.action-btn.delete:hover,
.action-btn.hide:hover {
    background-color: #e7000b;
    border-color: #e7000b;
}

.action-btn.seek {
    border-color: #00a63e;
    color: #00a63e;
}
.action-btn.seek:hover {
    border-color: #00a63e;
    background-color: #00a63e;
    color: white;
}

.action-btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: auto;
    }

    .content-area {
        padding: 20px 24px;
    }
    
    .sidebar {
        top: 73px;
        overflow-x: auto;
        width: 100%;
        padding: 16px 12px;
    }
    
    .sidebar-title {
        padding: 0 8px;
        font-size: 14px;
    }
    
    .sidebar-nav {
        flex-direction: row;
    }

    .sidebar-btn {
        height: 40px;
        font-size: 12px;
        padding: 0 8px;
        gap: 8px;
        white-space: nowrap;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .course-grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    }
}

@media (max-width: 768px) {
    .content-area {
        padding: 16px;
    }

    .page-title {
        font-size: 20px;
    }

    .page-subtitle {
        font-size: 14px;
    }

    .filter-section {
        flex-direction: column;
        align-items: stretch;
    }

    .search-input {
        min-width: auto;
        width: 100%;
    }

    .filter-btn {
        width: 100%;
        text-align: center;
    }

    .course-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .course-title {
        font-size: 14px;
    }

    .course-subtitle {
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .content-area {
        padding: 12px;
    }

    .page-header {
        flex-direction: column;
        gap: 12px;
        margin-bottom: 16px;
    }

    .page-title {
        font-size: 18px;
    }

    .page-subtitle {
        font-size: 12px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .course-grid {
        grid-template-columns: 1fr;
    }

    .course-actions {
        flex-direction: column;
    }

    .action-btn {
        width: 100%;
    }
}