* {
    box-sizing: border-box;
    font-family: system-ui, 'Segoe UI', Roboto, sans-serif;
}
body {
    margin: 0;
    background: #f5f7fb;
    color: #1e293b;
}
header {
    background: white;
    padding: 1rem 2rem;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}
h1 { margin: 0; font-size: 1.5rem; }
.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    padding: 2rem;
}
.lesson-card {
    background: white;
    border-radius: 1rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    padding: 1.2rem;
    transition: transform 0.1s ease;
    cursor: pointer;
    border: 1px solid #e2e8f0;
}
.lesson-card:hover {
    transform: translateY(-4px);
    border-color: #cbd5e1;
}
.lesson-card.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: #f1f5f9;
}
.lesson-card h3 { margin-top: 0; color: #0f172a; }
.lesson-card p { margin: 0.5rem 0; color: #334155; }
.slots {
    font-weight: bold;
    margin-top: 0.8rem;
    color: #2d6a4f;
}
.slots.full { color: #b91c1c; }
.filters {
    margin: 1rem 2rem;
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
}
.filters input, .filters button {
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    border: 1px solid #cbd5e1;
    background: white;
}
button {
    background: #1e3a8a;
    color: white;
    border: none;
    padding: 0.5rem 1.2rem;
    border-radius: 2rem;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.2s;
}
button:hover { background: #1e40af; }
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    justify-content: center;
    align-items: center;
}
.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 1.5rem;
    width: 90%;
    max-width: 500px;
    position: relative;
}
.modal-content.large { max-width: 800px; }
.close {
    position: absolute;
    right: 1.5rem;
    top: 1rem;
    font-size: 1.8rem;
    cursor: pointer;
    color: #64748b;
}
form label {
    display: block;
    margin: 1rem 0 0.3rem;
    font-weight: 500;
}
form input, form textarea {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid #cbd5e1;
    border-radius: 0.8rem;
}
.lessons-list .lesson-item {
    background: white;
    margin: 1rem 2rem;
    padding: 1rem;
    border-radius: 1rem;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
}
.lesson-actions button {
    margin-left: 0.5rem;
    background: #475569;
}
.lesson-actions button.danger { background: #b91c1c; }
.import-section {
    background: #f9fafb;
    padding: 1rem;
    border-radius: 1rem;
    margin: 1rem 2rem;
}
#importPreview table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}
#importPreview th, #importPreview td {
    padding: 8px;
    border: 1px solid #ddd;
}
@media (max-width: 640px) {
    .lessons-grid { padding: 1rem; }
    .filters { margin: 1rem; }
}
.filters {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    flex-wrap: wrap;
}
#availableCount {
    margin-left: auto;
    white-space: nowrap;
}
/* Группа фильтров */
.filters {
    display: flex;
    align-items: flex-end;
    gap: 1rem;
    flex-wrap: wrap;
    background: white;
    padding: 1rem 1.5rem;
    border-radius: 1.5rem;
    margin: 1rem 2rem;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    min-width: 150px;
    max-width: 450px;
}

.filter-group label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #475569;
}

.filter-group select,
.filter-group input {
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    border: 1px solid #cbd5e1;
    background-color: white;
    font-size: 0.9rem;
    cursor: pointer;
    transition: 0.2s;
}

.filter-group select:hover,
.filter-group input:hover {
    border-color: #94a3b8;
}

.filter-group select:focus,
.filter-group input:focus {
    outline: none;
    border-color: #1e3a8a;
    box-shadow: 0 0 0 2px rgba(30,58,138,0.2);
}

.reset-btn {
    background: #f1f5f9;
    color: #1e293b;
    border: 1px solid #cbd5e1;
}

.reset-btn:hover {
    background: #e2e8f0;
    border-color: #94a3b8;
}

.lessons-count {
    background: #e2e8f0;
    padding: 0.4rem 1rem;
    border-radius: 2rem;
    font-weight: bold;
    font-size: 0.9rem;
    margin-left: auto;
    white-space: nowrap;
}

/* Адаптивность */
@media (max-width: 640px) {
    .filters {
        flex-direction: column;
        align-items: stretch;
        margin: 1rem;
    }
    .filter-group {
        min-width: auto;
    }
    .lessons-count {
        margin-left: 0;
        text-align: center;
    }
}