.lesson-plan-container {
    width: 100%;
    margin: 0;
    padding: 16px 24px;
    max-width: 100%;
}

.form-section {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    padding: 32px;
    margin-bottom: 32px;
}

.form-section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.form-section h2 i {
    color: var(--primary);
    font-size: 1.4rem;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.form-group {
    margin-bottom: 8px;
}

.form-group label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.form-control {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    transition: var(--transition);
    font-family: inherit;
    background: var(--surface);
    color: var(--text-primary);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-lighter);
}

.form-group select {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    transition: var(--transition);
    font-family: inherit;
    background: var(--surface);
    color: var(--text-primary);
}

.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-lighter);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
    line-height: 1.6;
}

/* 信息分组样式 */
.info-group {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 24px;
    transition: var(--transition);
}

.info-group:hover {
    border-color: var(--primary-light);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.info-group:last-child {
    margin-bottom: 0;
}

.group-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-lighter);
    display: flex;
    align-items: center;
    gap: 10px;
}

.group-title i {
    color: var(--primary);
    font-size: 1rem;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-lighter);
    border-radius: var(--radius-sm);
}

/* 必填标记 */
.required {
    color: #ef4444;
    font-weight: 600;
}

.upload-section {
    text-align: center;
    padding: 48px 24px;
    border: 3px dashed var(--border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
    background: var(--background);
}

.upload-section:hover {
    border-color: var(--primary);
    background: var(--primary-lightest);
    transform: translateY(-2px);
}

.upload-section.dragover {
    border-color: var(--primary);
    background: var(--primary-lightest);
    transform: scale(1.01);
    box-shadow: 0 8px 16px rgba(37, 99, 235, 0.15);
}

.upload-content i {
    font-size: 4rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.upload-content p {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.upload-content span {
    font-size: 0.9375rem;
    color: var(--text-muted);
}

.action-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 32px;
    padding: 16px 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 8px 12px -2px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    background: var(--background);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border-light);
    border-color: var(--text-muted);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 响应式调整 */
@media (max-width: 1400px) {
    .lesson-plan-container {
        padding: 20px;
    }
    
    .form-section {
        padding: 28px;
        margin-bottom: 28px;
    }
    
    .form-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 20px;
    }
}

@media (max-width: 1200px) {
    .form-grid {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
        gap: 18px;
    }
    
    .lesson-plan-container {
        padding: 18px;
    }
    
    .form-section {
        padding: 24px;
        margin-bottom: 24px;
    }
    
    .form-section h2 {
        font-size: 1.375rem;
    }
    
    .upload-section {
        padding: 40px 20px;
    }
    
    .upload-content i {
        font-size: 3.5rem;
    }
}

@media (max-width: 768px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .lesson-plan-container {
        padding: 16px;
    }
    
    .form-section {
        padding: 20px;
        margin-bottom: 20px;
    }
    
    .form-section h2 {
        font-size: 1.25rem;
    }
    
    .info-group {
        padding: 16px;
        margin-bottom: 16px;
    }
    
    .group-title {
        font-size: 1rem;
        margin-bottom: 16px;
        padding-bottom: 10px;
    }
    
    .upload-section {
        padding: 32px 16px;
    }
    
    .upload-content i {
        font-size: 3rem;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}