.homework-section {
    margin-top: 40px;
}

.homework-section h2 {
    font-size: 2rem;
    font-weight: 700;
    color: #1f2d4d;
    margin-bottom: 20px;
}

.homework-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    padding: 24px 26px;
    background: #ffffff;
    border: 1px solid #d9e4f2;
    border-radius: 18px;
    box-shadow: 0 8px 24px rgba(36, 75, 130, 0.08);
    margin-bottom: 18px;
}

.homework-info h3 {
    margin: 0 0 8px 0;
    font-size: 1.8rem;
    color: #16325c;
}

.homework-info p {
    margin: 0;
    font-size: 1.05rem;
    color: #4a5d7a;
}

.homework-btn {
    display: inline-block;
    background: #2f67f6;
    color: #ffffff;
    padding: 12px 20px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    white-space: nowrap;
    transition: background 0.2s ease, transform 0.2s ease;
}

.homework-btn:hover {
    background: #1f56e0;
    transform: translateY(-1px);
}

.homework-page {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 20px;
}

.homework-breadcrumb {
    margin-bottom: 14px;
    font-size: 1rem;
    color: #5c6f8a;
}

.homework-breadcrumb a {
    color: #5a2fd6;
    text-decoration: none;
    font-weight: 500;
}

.homework-breadcrumb a:hover {
    text-decoration: underline;
}

.homework-card-main {
    background: #ffffff;
    border: 1px solid #d9e4f2;
    border-radius: 20px;
    box-shadow: 0 10px 28px rgba(36, 75, 130, 0.08);
    padding: 32px;
}

.homework-title {
    font-size: 2.6rem;
    font-weight: 800;
    color: #16325c;
    margin-bottom: 10px;
}

.homework-description {
    font-size: 1.1rem;
    color: #526581;
    margin-bottom: 26px;
}

.homework-content {
    font-size: 1.08rem;
    color: #1f2d3d;
    line-height: 1.8;
}

.homework-content ol {
    padding-left: 24px;
}

.homework-content li {
    margin-bottom: 10px;
}

.homework-divider {
    margin: 32px 0;
    border: none;
    border-top: 1px solid #dbe4ee;
}

.homework-subsection-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: #16325c;
    margin-bottom: 14px;
}

.homework-empty {
    color: #5f708a;
    font-size: 1rem;
}

.homework-pdf-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.homework-pdf-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    border: 1px solid #dbe4ee;
    border-radius: 12px;
    margin-bottom: 12px;
    background: #f9fbff;
}

.homework-pdf-list a {
    color: #1f56e0;
    text-decoration: none;
    font-weight: 600;
}

.homework-pdf-list a:hover {
    text-decoration: underline;
}

.homework-upload-form {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.homework-upload-form input[type="file"] {
    padding: 10px;
    border: 1px solid #dbe4ee;
    border-radius: 10px;
    background: white;
}

.homework-upload-btn,
.homework-delete-btn {
    background: #2f67f6;
    color: white;
    border: none;
    padding: 10px 18px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
}

.homework-upload-btn:hover,
.homework-delete-btn:hover {
    background: #1f56e0;
    transform: translateY(-1px);
}

.homework-delete-btn {
    background: #dc3545;
}

.homework-delete-btn:hover {
    background: #bb2d3b;
}
/* =========================
   Homework PDF Management
   ========================= */

.management-panel {
    margin-top: 1.5rem;
    padding: 1.25rem;
    background: #f8fbff;
    border: 1px solid #dbe7f5;
    border-radius: 14px;
    box-shadow: 0 4px 14px rgba(15, 23, 42, 0.04);
}

.management-panel-title {
    margin: 0 0 1rem 0;
    font-size: 1.35rem;
    font-weight: 700;
    color: #0f172a;
}

.management-list-title {
    margin: 1.25rem 0 0.75rem 0;
    font-size: 1.05rem;
    font-weight: 700;
    color: #1e293b;
}

.homework-upload-form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.homework-upload-form label {
    font-weight: 600;
    color: #1e293b;
    font-size: 0.98rem;
}

.upload-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.upload-controls input[type="file"] {
    flex: 1 1 280px;
    max-width: 420px;
    padding: 0.65rem 0.75rem;
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    background: #ffffff;
    color: #334155;
    font-size: 0.95rem;
}

.homework-upload-btn {
    padding: 0.72rem 1.2rem;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    color: #ffffff;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
    box-shadow: 0 6px 14px rgba(37, 99, 235, 0.22);
}

.homework-upload-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 18px rgba(37, 99, 235, 0.28);
}

.homework-upload-btn:active {
    transform: translateY(0);
}

.homework-pdf-manage-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.pdf-manage-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.85rem 1rem;
    background: #ffffff;
    border: 1px solid #dbe7f5;
    border-radius: 12px;
}

.pdf-manage-item span {
    font-size: 0.96rem;
    color: #0f172a;
    font-weight: 500;
    word-break: break-word;
}

.delete-form-inline {
    margin: 0;
    flex-shrink: 0;
}

.homework-delete-btn {
    padding: 0.58rem 1rem;
    border: none;
    border-radius: 10px;
    background: linear-gradient(135deg, #dc2626, #ef4444);
    color: #ffffff;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
    box-shadow: 0 6px 14px rgba(220, 38, 38, 0.18);
}

.homework-delete-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 18px rgba(220, 38, 38, 0.24);
}

.homework-delete-btn:active {
    transform: translateY(0);
}

.homework-pdf-list-student {
    margin: 0;
    padding-left: 1.25rem;
}

.homework-pdf-list-student li {
    margin-bottom: 0.5rem;
}

.homework-pdf-list-student a {
    color: #2563eb;
    text-decoration: none;
    font-weight: 500;
}

.homework-pdf-list-student a:hover {
    text-decoration: underline;
}

.form-message {
    margin-bottom: 0.9rem;
    padding: 0.85rem 1rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.94rem;
}

.success-message {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.error-message {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* Optional improvement for empty text */
.homework-empty {
    color: #64748b;
    font-style: italic;
}

/* Responsive tweaks */
@media (max-width: 640px) {
    .pdf-manage-item {
        flex-direction: column;
        align-items: stretch;
    }

    .homework-delete-btn,
    .homework-upload-btn {
        width: 100%;
    }

    .upload-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .upload-controls input[type="file"] {
        max-width: 100%;
        width: 100%;
    }
}